hazelcast

package module
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 Go to latest Published: Aug 22, 2023 License: Apache-2.0 Imports: 36 Imported by: 188

README

Hazelcast Go Client

Go Reference

Hazelcast is an open-source distributed in-memory data store and computation platform that provides a wide variety of distributed data structures and concurrency primitives.

Hazelcast Go client is a way to communicate with Hazelcast 4 and 5 clusters and access the cluster data.

Sample Code

package main

import (
	"context"
	"fmt"
	"log"

	"github.com/hazelcast/hazelcast-go-client"
)

func main() {
	ctx := context.TODO()
	// create the client and connect to the cluster on localhost
	client, err := hazelcast.StartNewClient(ctx)
	if err != nil {
		log.Fatal(err)
	}
	// get a map
	people, err := client.GetMap(ctx, "people")
	if err != nil {
		log.Fatal(err)
	}
	personName := "Jane Doe"
	// set a value in the map
	if err = people.Set(ctx, personName, 30); err != nil {
		log.Fatal(err)
	}
	// get a value from the map
	age, err := people.Get(ctx, personName)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("%s is %d years old.\n", personName, age)
	// stop the client to release resources
	client.Shutdown(ctx)
}

Features

  • Distributed, partitioned and queryable in-memory key-value store implementation, called Map.
  • Additional data structures and simple messaging constructs such as Replicated Map, MultiMap, Queue, List, PNCounter, Set, Topic and others.
  • Support for serverless and traditional web service architectures with Unisocket and Smart operation modes.
  • Go context support for all distributed data structures.
  • SQL support (only on Hazelcast 5.x).
  • External smart client discovery.
  • Hazelcast Management Center integration.
  • Ability to listen to client lifecycle, cluster state, and distributed data structure events.
  • And more...

Install

Requirements:

  • Hazelcast Go client is compatible only with Hazelcast 4.x and 5.x.
  • We support two most recent releases of Go, currently 1.17 and up.

In your Go module enabled project, add a dependency to github.com/hazelcast/hazelcast-go-client:

# Depend on the latest release
$ go get github.com/hazelcast/hazelcast-go-client@latest

Quick Start

Hazelcast Go client requires a working Hazelcast cluster.

Check out our Get Started page for options.

Starting the Default Client

Start the client with the default Hazelcast host and port using hazelcast.StartNewClient, when Hazelcast is running on local with the default options:

ctx := context.TODO()
client, err := hazelcast.StartNewClient(ctx)
// handle client start error
Starting the Client with Given Options

Note that Config structs are not thread-safe. Complete creation of the configuration in a single goroutine.

// create the default configuration
config := hazelcast.Config{}
// optionally set member addresses manually
config.Cluster.Network.SetAddresses("member1.example.com:5701", "member2.example.com:5701")
// create and start the client with the configuration provider
client, err := hazelcast.StartNewClientWithConfig(ctx, config)
// handle client start error

Documentation

Hazelcast Go Client documentation is hosted at pkg.go.dev.

You can view the documentation locally by using godoc:

$ godoc -http=localhost:5500

godoc is not installed by default with the base Go distribution. Install it using:

$ go get -u golang.org/x/tools/...`

Support

Join us at Go Client channel or Hazelcast at Google Groups.

Running the tests

Currently, we support only Linux, MacOS and WSL (Windows Subsystem for Linux) for testing the client.

You need to have the following installed in order to run integration tests:

  • Java 8
  • Maven 3 or better
  • Bash
  • Make

Before running the tests, starts Hazelcast Remote Controller, which enables the test suite to create clusters:

# Start RC with Hazelcast Community features
$ ./rc.sh start

# Or, start RC with Hazelcast Enterprise features
$ HAZELCAST_ENTERPRISE_KEY=ENTERPRISE-KEY-HERE ./rc.sh start

You can run the tests using one of the following approaches:

  • Run make test-all to run integration tests.
  • Run make test-all-race to run integration tests with race detection.
  • Run make test-cover to generate the coverage report and make view-cover to view the test coverage summary and generate an HTML report.

Testing the client with SSL support requires running the remote controller with Hazelcast Enterprise features. To enable SSL connections, add ENABLE_SSL=1 to environment variables, or prepend it to the make commands above.

In order to turn on verbose logging, add ENABLE_TRACE=1 to environment variables, or prepend it to the make commands above.

License

Apache 2 License.

Copyright (c) 2008-2021, Hazelcast, Inc. All Rights Reserved.

Visit www.hazelcast.com for more information.

Documentation

Overview

Package hazelcast provides the Hazelcast Go client.

Hazelcast is an open-source distributed in-memory data store and computation platform. It provides a wide variety of distributed data structures and concurrency primitives.

Hazelcast Go client is a way to communicate to Hazelcast IMDG clusters and access the cluster data.

Configuration

If you are using Hazelcast and Go Client on the same computer, generally the default configuration should be fine. This is great for trying out the client. However, if you run the client on a different computer than any of the cluster members, you may need to do some simple configurations such as specifying the member addresses.

The Hazelcast members and clients have their own configuration options. You may need to reflect some of the member side configurations on the client side to properly connect to the cluster.

In order to configure the client, you only need to create a new `hazelcast.Config{}`, which you can pass to `hazelcast.StartNewClientWithConnfig` function: 

config := hazelcast.Config{}
client, err := hazelcast.StartNewClientWithConfig(context.TODO(), config)

Calling hazelcast.StartNewClientWithConfig with the default configuration is equivalent to hazelcast.StartNewClient. The default configuration assumes Hazelcast is running at localhost:5701 with the cluster name set to dev. If you run Hazelcast members in a different server than the client, you need to make certain changes to client settings.

Assuming Hazelcast members are running at hz1.server.com:5701, hz2.server.com:5701 and hz3.server.com:5701 with cluster name production, you would use the configuration below. Note that addresses must include port numbers: 

config := hazelcast.Config{}
config.Cluster.Name = "production"
config.Cluster.Network.SetAddresses("hz1.server.com:5701", "hz2.server.com:5701", "hz3.server.com:5701")

You can also load configuration from JSON: 

text := `
	{
		"Cluster": {
			"Name": "production",
			"Network": {
				"Addresses": [
					"hz1.server.com:5701",
					"hz2.server.com:5701",
					"hz3.server.com:5701"
				]
			}
		}
	}`
var config hazelcast.Config
if err := json.Unmarshal([]byte(text), &config); err != nil {
	panic(err)
}

If you are changing several options in a configuration section, you may have to repeatedly specify the configuration section: 

config := hazelcast.Config{}
config.Cluster.Name = "dev"
config.Cluster.HeartbeatInterval = types.Duration(60 * time.Second)
config.Cluster.Unisocket = true
config.Cluster.SetLoadBalancer(cluster.NewRandomLoadBalancer())

You can simplify the code above by getting a reference to config.Cluster and update it: 

config := hazelcast.Config{}
cc := &config.Cluster  // Note that we are getting a reference to config.Cluster!
cc.Name = "dev"
cc.HeartbeatInterval = types.Duration(60 * time.Second)
cc.Unisocket = true
cc.SetLoadBalancer(cluster.NewRandomLoadBalancer())

Note that you should get a reference to the configuration section you are updating, otherwise you would update a copy of it, which doesn't modify the configuration.

There are a few options that require a duration, such as config.Cluster.HeartbeatInterval, config.Cluster.Network.ConnectionTimeout and others. You must use types.Duration instead of time.Duration with those options, since types.Duration values support human readable durations when deserialized from text: 

import "github.com/hazelcast/hazelcast-go-client/types"
// ...
config := hazelcast.Config{}
config.Cluster.InvocationTimeout = types.Duration(3 * time.Minute)
config.Cluster.Network.ConnectionTimeout = types.Duration(10 * time.Second)

That corresponds to the following JSON configuration. Refer to https://golang.org/pkg/time/#ParseDuration for the available duration strings: 

{
	"Cluster": {
		"InvocationTimeout": "3m",
		"Network": {
			"ConnectionTimeout": "10s"
		}
}

Here are all configuration items with their default values: 

config := hazelcast.Config{}
config.ClientName = ""
config.SetLabels()

cc := &config.Cluster
cc.Name = "dev"
cc.HeartbeatTimeout = types.Duration(5 * time.Second)
cc.HeartbeatInterval = types.Duration(60 * time.Second)
cc.InvocationTimeout = types.Duration(120 * time.Second)
cc.RedoOperation = false
cc.Unisocket = false
cc.SetLoadBalancer(cluster.NewRoundRobinLoadBalancer())

cc.Network.SetAddresses("127.0.0.1:5701")
cc.Network.SSL.Enabled = true
cc.Network.SSL.SetTLSConfig(&tls.Config{})
cc.Network.ConnectionTimeout = types.Duration(5 * time.Second)

cc.Security.Credentials.Username = ""
cc.Security.Credentials.Password = ""

cc.Discovery.UsePublicIP = false

cc.Cloud.Enabled = false
cc.Cloud.Token = ""

cc.ConnectionStrategy.ReconnectMode = cluster.ReconnectModeOn
cc.ConnectionStrategy.Timeout = types.Duration(1<<63 - 1)
cc.ConnectionStrategy.Retry.InitialBackoff = types.Duration(1*time.Second)
cc.ConnectionStrategy.Retry.MaxBackoff = types.Duration(30*time.Second)
cc.ConnectionStrategy.Retry.Multiplier = 1.05
cc.ConnectionStrategy.Retry.Jitter = 0.0

config.Serialization.PortableVersion = 0
config.Serialization.LittleEndian = false
config.Serialization.SetPortableFactories()
config.Serialization.SetIdentifiedDataSerializableFactories()
config.Serialization.SetCustomSerializer()
config.Serialization.SetClassDefinitions()
config.Serialization.SetGlobalSerializer() // Gob serializer

config.Stats.Enabled = false
config.Stats.Period = types.Duration(5 * time.Second)

config.Logger.Level = logger.InfoLevel

Checkout the nearcache package for the documentation about the Near Cache.

Listening for Distributed Object Events

You can listen to creation and destroy events for distributed objects by attaching a listener to the client. A distributed object is created when first referenced unless it already exists. Here is an example: 

// Error handling is omitted for brevity.
handler := func(e hazelcast.DistributedObjectNotified) {
	isMapEvent := e.ServiceName == hazelcast.ServiceNameMap
	isCreationEvent := e.EventType == hazelcast.DistributedObjectCreated
	log.Println(e.EventType, e.ServiceName, e.ObjectName, "creation?", isCreationEvent, "isMap?", isMapEvent)
}
subscriptionID, _ := client.AddDistributedObjectListener(ctx, handler)
myMap, _ := client.GetMap(ctx, "my-map")
// handler is called with: ServiceName=ServiceNameMap; ObjectName="my-map"; EventType=DistributedObjectCreated
myMap.Destroy(ctx)
// handler is called with: ServiceName=ServiceNameMap; ObjectName="my-map"; EventType=DistributedObjectDestroyed

If you don't want to receive any distributed object events, use client.RemoveDistributedObjectListener: 

client.RemoveDistributedObjectListener(subscriptionID)

Running SQL Queries

Running SQL queries require Hazelcast 5.0 and up. Check out the Hazelcast SQL documentation here: https://docs.hazelcast.com/hazelcast/latest/sql/sql-overview

The SQL support should be enabled in Hazelcast server configuration: 

<hazelcast>
	<jet enabled="true" />
</hazelcast>

The client supports two kinds of queries: The ones returning rows (select statements and a few others) and the rest (insert, update, etc.). The former kinds of queries are executed with QuerySQL method and the latter ones are executed with ExecSQL method.

Use the question mark (?) for placeholders.

To connect to a data source and query it as if it is a table, a mapping should be created. Currently, mappings for Map, Kafka and file data sources are supported.

You can read the details about mappings here: https://docs.hazelcast.com/hazelcast/latest/sql/sql-overview#mappings

The following data types are supported when inserting/updating. The names in parantheses correspond to SQL types:

  • string (varchar)
  • int8 (tinyint)
  • int16 (smallint)
  • int32 (integer)
  • int64 (bigint)
  • bool (boolean)
  • float32 (real)
  • float64 (double)
  • types.Decimal (decimal)
  • time.Time not supported, use one of types.LocalDate, types.LocalTime, types.LocalDateTime or types.OffsetDateTime
  • types.LocalDate (date)
  • types.LocalTime (time)
  • types.LocalDateTime (timestamp)
  • types.OffsetDateTime (timestamp with time zone)
  • serialization.JSON (json)

Using Date/Time

In order to force using a specific date/time type, create a time.Time value and cast it to the target type: 

t := time.Now()
dateValue := types.LocalDate(t)
timeValue := types.LocalTime(t)
dateTimeValue := types.LocalDateTime(t)
dateTimeWithTimezoneValue := types.OffsetDateTime(t)

Management Center Integration

Hazelcast Management Center can monitor your clients if client-side statistics are enabled.

You can enable statistics by setting config.Stats.Enabled to true. Optionally, the period of statistics collection can be set using config.Stats.Period setting. The labels set in configuration appear in the Management Center console: 

config := hazelcast.Config{}
config.SetLabels("fast-cache", "staging")
config.Stats.Enabled = true
config.Stats.Period = 1 * time.Second
client, err := hazelcast.StartNewClientWithConfig(config)
Example 
// Create the configuration
config := hazelcast.Config{}
config.Cluster.Name = "dev"
config.Cluster.Network.SetAddresses("localhost:5701")
// Start the client with the configuration provider.
ctx := context.TODO()
client, err := hazelcast.StartNewClientWithConfig(ctx, config)
if err != nil {
	log.Fatal(err)
}
// Retrieve a map.
peopleMap, err := client.GetMap(ctx, "people")
if err != nil {
	log.Fatal(err)
}
// Call map functions.
err = peopleMap.Set(ctx, "jane", "doe")
if err != nil {
	log.Fatal(err)
}
// Stop the client once you are done with it.
client.Shutdown(ctx)

Output:

Index

Examples

Constants

View Source 
const (
	ServiceNameMap              = "hz:impl:mapService"
	ServiceNameReplicatedMap    = "hz:impl:replicatedMapService"
	ServiceNameMultiMap         = "hz:impl:multiMapService"
	ServiceNameQueue            = "hz:impl:queueService"
	ServiceNameTopic            = "hz:impl:topicService"
	ServiceNameList             = "hz:impl:listService"
	ServiceNameRingBuffer       = "hz:impl:ringbufferService"
	ServiceNameSet              = "hz:impl:setService"
	ServiceNamePNCounter        = "hz:impl:PNCounterService"
	ServiceNameFlakeIDGenerator = "hz:impl:flakeIdGeneratorService"
)
View Source 
const (
	// ClientVersion is the semantic versioning compatible client version.
	ClientVersion = internal.CurrentClientVersion
)
View Source 
const MaxBatchSize = 1000
View Source 
const ReadResultSetSequenceUnavailable int64 = -1

ReadResultSetSequenceUnavailable is used when error happened

Variables

This section is empty.

Functions

This section is empty.

Types

type AtomicLong added in v1.4.0 

type AtomicLong = icp.AtomicLong

type CPSubsystem added in v1.4.0 

type CPSubsystem = icp.Subsystem

type Client 

type Client struct {
	// contains filtered or unexported fields
}

Client enables you to do all Hazelcast operations without being a member of the cluster. It connects to one or more of the cluster members and delegates all cluster wide operations to them.

func StartNewClient added in v1.0.0 

func StartNewClient(ctx context.Context) (*Client, error)

StartNewClient creates and starts a new client with the default configuration. The default configuration is tuned connect to an Hazelcast cluster running on the same computer with the client.

func StartNewClientWithConfig added in v1.0.0 

func StartNewClientWithConfig(ctx context.Context, config Config) (*Client, error)

StartNewClientWithConfig creates and starts a new client with the given configuration.

func (*Client) AddDistributedObjectListener added in v1.0.0 

func (c *Client) AddDistributedObjectListener(ctx context.Context, handler DistributedObjectNotifiedHandler) (types.UUID, error)

AddDistributedObjectListener adds a distributed object listener and returns a unique subscription ID. Use the returned subscription ID to remove the listener.

func (*Client) AddLifecycleListener added in v1.0.0 

func (c *Client) AddLifecycleListener(handler LifecycleStateChangeHandler) (types.UUID, error)

AddLifecycleListener adds a lifecycle state change handler after the client starts. Use the returned subscription ID to remove the listener. The handler must not block.

func (*Client) AddMembershipListener added in v1.0.0 

func (c *Client) AddMembershipListener(handler cluster.MembershipStateChangeHandler) (types.UUID, error)

AddMembershipListener adds a member state change handler and returns a unique subscription ID. Use the returned subscription ID to remove the listener.

func (*Client) CPSubsystem added in v1.4.0 

func (c *Client) CPSubsystem() CPSubsystem

CPSubsystem returns a service to offer a set of in-memory linearizable data structures.

func (*Client) GetDistributedObjectsInfo added in v1.1.0 

func (c *Client) GetDistributedObjectsInfo(ctx context.Context) ([]types.DistributedObjectInfo, error)

GetDistributedObjectsInfo returns the information of all objects created cluster-wide.

func (*Client) GetFlakeIDGenerator 

func (c *Client) GetFlakeIDGenerator(ctx context.Context, name string) (*FlakeIDGenerator, error)

GetFlakeIDGenerator returns a FlakeIDGenerator instance.

func (*Client) GetList 

func (c *Client) GetList(ctx context.Context, name string) (*List, error)

GetList returns a list instance.

func (*Client) GetMap 

func (c *Client) GetMap(ctx context.Context, name string) (*Map, error)

GetMap returns a distributed map instance.

func (*Client) GetMultiMap 

func (c *Client) GetMultiMap(ctx context.Context, name string) (*MultiMap, error)

GetMultiMap returns a MultiMap instance.

func (*Client) GetPNCounter 

func (c *Client) GetPNCounter(ctx context.Context, name string) (*PNCounter, error)

GetPNCounter returns a PNCounter instance.

func (*Client) GetQueue 

func (c *Client) GetQueue(ctx context.Context, name string) (*Queue, error)

GetQueue returns a queue instance.

func (*Client) GetReplicatedMap 

func (c *Client) GetReplicatedMap(ctx context.Context, name string) (*ReplicatedMap, error)

GetReplicatedMap returns a replicated map instance.

func (*Client) GetRingbuffer 

func (c *Client) GetRingbuffer(ctx context.Context, name string) (*Ringbuffer, error)

GetRingbuffer returns a Ringbuffer instance

func (*Client) GetSet 

func (c *Client) GetSet(ctx context.Context, name string) (*Set, error)

GetSet returns a set instance.

func (*Client) GetTopic 

func (c *Client) GetTopic(ctx context.Context, name string) (*Topic, error)

GetTopic returns a topic instance.

func (*Client) Name 

func (c *Client) Name() string

Name returns client's name Use config.Name to set the client name. If not set manually, an automatically generated name is used.

func (*Client) RemoveDistributedObjectListener added in v1.0.0 

func (c *Client) RemoveDistributedObjectListener(ctx context.Context, subscriptionID types.UUID) error

RemoveDistributedObjectListener removes the distributed object listener handler with the given subscription ID.

func (*Client) RemoveLifecycleListener added in v1.0.0 

func (c *Client) RemoveLifecycleListener(subscriptionID types.UUID) error

RemoveLifecycleListener removes the lifecycle state change handler with the given subscription ID

func (*Client) RemoveMembershipListener added in v1.0.0 

func (c *Client) RemoveMembershipListener(subscriptionID types.UUID) error

RemoveMembershipListener removes the member state change handler with the given subscription ID.

func (*Client) Running added in v1.0.0 

func (c *Client) Running() bool

Running returns true if the client is running.

func (*Client) SQL added in v1.2.0 

func (c *Client) SQL() sql.Service

SQL returns a service to execute distributes SQL queries.

func (*Client) Shutdown 

func (c *Client) Shutdown(ctx context.Context) error

Shutdown disconnects the client from the cluster and frees resources allocated by the client.

type Config added in v1.0.0 

type Config struct {
	NearCaches            []nearcache.Config                `json:",omitempty"`
	FlakeIDGenerators     map[string]FlakeIDGeneratorConfig `json:",omitempty"`
	Labels                []string                          `json:",omitempty"`
	ClientName            string                            `json:",omitempty"`
	Logger                logger.Config                     `json:",omitempty"`
	Failover              cluster.FailoverConfig            `json:",omitempty"`
	Serialization         serialization.Config              `json:",omitempty"`
	Cluster               cluster.Config                    `json:",omitempty"`
	Stats                 StatsConfig                       `json:",omitempty"`
	NearCacheInvalidation NearCacheInvalidationConfig       `json:",omitempty"`
	// contains filtered or unexported fields
}

Config contains configuration for a client. Zero value of Config is the default configuration.

func NewConfig 

func NewConfig() Config

NewConfig creates the default configuration.

func (*Config) AddFlakeIDGenerator added in v1.1.0 

func (c *Config) AddFlakeIDGenerator(name string, prefetchCount int32, prefetchExpiry types.Duration) error

AddFlakeIDGenerator validates the values and adds new FlakeIDGeneratorConfig with the given name.

func (*Config) AddLifecycleListener added in v1.0.0 

func (c *Config) AddLifecycleListener(handler LifecycleStateChangeHandler) types.UUID

AddLifecycleListener adds a lifecycle listener. The listener is attached to the client before the client starts, so all lifecycle events can be received. Use the returned subscription ID to remove the listener. The handler must not block.

func (*Config) AddMembershipListener added in v1.0.0 

func (c *Config) AddMembershipListener(handler cluster.MembershipStateChangeHandler) types.UUID

AddMembershipListener adds a membership listener. The listener is attached to the client before the client starts, so all membership events can be received. Use the returned subscription ID to remove the listener.

func (*Config) AddNearCache added in v1.3.0 

func (c *Config) AddNearCache(cfg nearcache.Config)

AddNearCache adds a near cache configuration.

func (*Config) Clone added in v1.0.0 

func (c *Config) Clone() Config

Clone returns a copy of the configuration.

func (*Config) GetNearCache added in v1.3.0 

func (c *Config) GetNearCache(pattern string) (nearcache.Config, bool, error)

GetNearCache returns the first configuration that matches the given pattern. Returns hzerrors.ErrInvalidConfiguration if the pattern matches more than one configuration.

func (Config) MarshalJSON added in v1.3.0 

func (c Config) MarshalJSON() ([]byte, error)

MarshalJSON marshals the configuration to JSON.

func (*Config) SetLabels added in v1.0.0 

func (c *Config) SetLabels(labels ...string)

SetLabels sets the labels for the client. These labels are displayed in the Hazelcast Management Center.

func (*Config) Validate added in v1.0.0 

func (c *Config) Validate() error

Validate validates the configuration and replaces missing configuration with defaults.

type DistributedObjectEventType added in v1.0.0 

type DistributedObjectEventType string

DistributedObjectEventType describes event type of a distributed object. 

const (
	// DistributedObjectCreated is the event type when a distributed object is created.
	DistributedObjectCreated DistributedObjectEventType = "CREATED"
	// DistributedObjectDestroyed is the event type when a distributed object is destroyed.
	DistributedObjectDestroyed DistributedObjectEventType = "DESTROYED"
)

type DistributedObjectNotified added in v1.0.0 

type DistributedObjectNotified struct {
	ServiceName string
	ObjectName  string
	EventType   DistributedObjectEventType
}

DistributedObjectNotified contains informatino about the distributed object event.

func (DistributedObjectNotified) EventName added in v1.0.0 

func (d DistributedObjectNotified) EventName() string

type DistributedObjectNotifiedHandler added in v1.0.0 

type DistributedObjectNotifiedHandler func(event DistributedObjectNotified)

DistributedObjectNotifiedHandler is called when a distribute object event occurs.

type EntryEventType added in v1.0.0 

type EntryEventType int32

EntryEventType is the type of an entry event. 

const (
	// EntryAdded is dispatched if an entry is added.
	EntryAdded EntryEventType = 1 << 0
	// EntryRemoved is dispatched if an entry is removed.
	EntryRemoved EntryEventType = 1 << 1
	// EntryUpdated is dispatched if an entry is updated.
	EntryUpdated EntryEventType = 1 << 2
	// EntryEvicted is dispatched if an entry is evicted.
	EntryEvicted EntryEventType = 1 << 3
	// EntryExpired is dispatched if an entry is expired.
	EntryExpired EntryEventType = 1 << 4
	// EntryAllEvicted is dispatched if all entries are evicted.
	EntryAllEvicted EntryEventType = 1 << 5
	// EntryAllCleared is dispatched if all entries are cleared.
	EntryAllCleared EntryEventType = 1 << 6
	// EntryMerged is dispatched if an entry is merged after a network partition.
	EntryMerged EntryEventType = 1 << 7
	// EntryInvalidated is dispatched if an entry is invalidated.
	EntryInvalidated EntryEventType = 1 << 8
	// EntryLoaded is dispatched if an entry is loaded.
	EntryLoaded EntryEventType = 1 << 9
)

type EntryNotified added in v1.0.0 

type EntryNotified struct {
	MergingValue            interface{}
	Key                     interface{}
	Value                   interface{}
	OldValue                interface{}
	MapName                 string
	Member                  cluster.MemberInfo
	NumberOfAffectedEntries int
	EventType               EntryEventType
}

EntryNotified contains information about an entry event. Member may have the zero value of cluster.MemberInfo if the member is not known at the time the corresponding callback runs. You can check that situation by checking whether Member.UUID is the default UUID.

func (*EntryNotified) EventName added in v1.0.0 

func (e *EntryNotified) EventName() string

type EntryNotifiedHandler added in v1.0.0 

type EntryNotifiedHandler func(event *EntryNotified)

EntryNotifiedHandler is called when an entry event happens.

type FlakeIDGenerator added in v1.1.0 

type FlakeIDGenerator struct {
	// contains filtered or unexported fields
}

FlakeIDGenerator is a cluster-wide unique ID generator.

Generated IDs are are k-ordered (roughly ordered) and in the range [0, math.MaxInt64]. They can be negative only if members are explicitly configured with a future epoch start value. For details, see: https://docs.hazelcast.com/imdg/latest/data-structures/flake-id-generator.html

Instead of asking cluster for each ID, they are fetched in batches and then served. Batch size and expiry duration can be configured via FlakeIDGeneratorConfig.

func (FlakeIDGenerator) Destroy added in v1.1.0 

func (p FlakeIDGenerator) Destroy(ctx context.Context) error

Destroy removes this object cluster-wide. Clears and releases all resources for this object.

func (FlakeIDGenerator) Name added in v1.4.0 

func (p FlakeIDGenerator) Name() string

func (*FlakeIDGenerator) NewID added in v1.1.0 

func (f *FlakeIDGenerator) NewID(ctx context.Context) (int64, error)

NewID generates and returns a cluster-wide unique ID.

type FlakeIDGeneratorConfig added in v1.1.0 

type FlakeIDGeneratorConfig struct {
	// PrefetchCount defines the number of pre-fetched IDs from cluster.
	// The allowed range is [1, 100_000] and defaults to 100.
	PrefetchCount int32 `json:",omitempty"`
	// PrefetchExpiry defines the expiry duration of pre-fetched IDs. Defaults to 10 minutes.
	PrefetchExpiry types.Duration `json:",omitempty"`
}

FlakeIDGeneratorConfig contains configuration for the pre-fetching behavior of FlakeIDGenerator.

func (*FlakeIDGeneratorConfig) Clone added in v1.4.0 

func (f *FlakeIDGeneratorConfig) Clone() FlakeIDGeneratorConfig

Clone returns a copy of the FlakeIDGeneratorConfig struct

func (*FlakeIDGeneratorConfig) Validate added in v1.1.0 

func (f *FlakeIDGeneratorConfig) Validate() error

Validate validates the configuration and adds the defaults.

type ItemEventType added in v1.0.0 

type ItemEventType int32

ItemEventType describes event types for item related events. 

const (
	// ItemAdded stands for item added event.
	ItemAdded ItemEventType = 1
	// ItemRemoved stands for item removed event.
	ItemRemoved ItemEventType = 2
)

type LifecycleState added in v1.0.0 

type LifecycleState int

LifecycleState indicates the state of the lifecycle event. 

const (
	// LifecycleStateStarting signals that the client is starting.
	LifecycleStateStarting LifecycleState = iota
	// LifecycleStateStarted signals that the client started.
	LifecycleStateStarted
	// LifecycleStateShuttingDown signals that the client is shutting down.
	LifecycleStateShuttingDown
	// LifecycleStateShutDown signals that the client shut down.
	LifecycleStateShutDown
	// LifecycleStateConnected signals that the client connected to the cluster.
	LifecycleStateConnected
	// LifecycleStateDisconnected signals that the client disconnected from the cluster.
	LifecycleStateDisconnected
	// LifecycleStateChangedCluster signals that the client is connected to a new cluster.
	LifecycleStateChangedCluster
)

func (LifecycleState) String added in v1.0.0 

func (s LifecycleState) String() string

type LifecycleStateChangeHandler added in v1.0.0 

type LifecycleStateChangeHandler func(event LifecycleStateChanged)

LifecycleStateChangeHandler is called when a lifecycle event occurs.

type LifecycleStateChanged added in v1.0.0 

type LifecycleStateChanged struct {
	State LifecycleState
}

LifecycleStateChanged contains information about a lifecycle event.

func (*LifecycleStateChanged) EventName added in v1.0.0 

func (e *LifecycleStateChanged) EventName() string

type List added in v1.0.0 

type List struct {
	// contains filtered or unexported fields
}

List is a concurrent, distributed, ordered collection. The user of this data structure has precise control over where in the list each element is inserted. The user can access elements by their integer index (position in the list), and search for elements in the list.

List is not a partitioned Hazelcast data structure. So all the contents of the List are stored in a single machine (and in the backup). So, a single List will not scale by adding more members in the cluster.

For details, see https://docs.hazelcast.com/imdg/latest/data-structures/map.html

Example 
ctx := context.TODO()
client, err := hazelcast.StartNewClient(ctx)
if err != nil {
	log.Fatal(err)
}
// Get a random list
list, err := client.GetList(ctx, "list-1")
if err != nil {
	log.Fatal(err)
}
// Get and print list size
size, err := list.Size(ctx)
if err != nil {
	log.Fatal(err)
}
fmt.Println(size)
// Add data, error handling is omitted here for brevity
list.Add(ctx, "Item 1")
list.Add(ctx, "Item 2")
// Get and print list size
size, err = list.Size(ctx)
if err != nil {
	log.Fatal(err)
}
fmt.Println(size)
// Shutdown client
client.Shutdown(ctx)

Output:

func (*List) Add added in v1.0.0 

func (l *List) Add(ctx context.Context, element interface{}) (bool, error)

Add appends the specified element to the end of this list. Returns true if the list has changed as a result of this operation, false otherwise.

func (*List) AddAll added in v1.0.0 

func (l *List) AddAll(ctx context.Context, elements ...interface{}) (bool, error)

AddAll appends all elements in the specified slice to the end of this list. Returns true if the list has changed as a result of this operation, false otherwise.

func (*List) AddAllAt added in v1.0.0 

func (l *List) AddAllAt(ctx context.Context, index int, elements ...interface{}) (bool, error)

AddAllAt inserts all elements in the specified slice at specified index, keeping the order of the slice. Shifts the subsequent elements to the right. Returns true if the list has changed as a result of this operation, false otherwise.

func (*List) AddAt added in v1.0.0 

func (l *List) AddAt(ctx context.Context, index int, element interface{}) error

AddAt inserts the specified element at the specified index. Shifts the subsequent elements to the right.

func (*List) AddListener added in v1.0.0 

func (l *List) AddListener(ctx context.Context, includeValue bool, handler ListItemNotifiedHandler) (types.UUID, error)

AddListener adds an item listener for this list. The listener will be invoked whenever an item is added to or removed from this list. Received events include the updated item if includeValue is true. Returns subscription ID of the listener.

func (*List) Clear added in v1.0.0 

func (l *List) Clear(ctx context.Context) error

Clear removes all elements from the list.

func (*List) Contains added in v1.0.0 

func (l *List) Contains(ctx context.Context, element interface{}) (bool, error)

Contains checks if the list contains the given element. Returns true if the list contains the element, false otherwise.

func (*List) ContainsAll added in v1.0.0 

func (l *List) ContainsAll(ctx context.Context, elements ...interface{}) (bool, error)

ContainsAll checks if the list contains all of the given elements. Returns true if the list contains all of the elements, otherwise false.

func (List) Destroy added in v1.0.0 

func (p List) Destroy(ctx context.Context) error

Destroy removes this object cluster-wide. Clears and releases all resources for this object.

func (*List) Get added in v1.0.0 

func (l *List) Get(ctx context.Context, index int) (interface{}, error)

Get retrieves the element at given index.

func (*List) GetAll added in v1.0.0 

func (l *List) GetAll(ctx context.Context) ([]interface{}, error)

GetAll returns a slice that contains all elements of this list in proper sequence.

func (*List) IndexOf added in v1.0.0 

func (l *List) IndexOf(ctx context.Context, element interface{}) (int, error)

IndexOf returns the index of the first occurrence of the given element in this list.

func (*List) IsEmpty added in v1.0.0 

func (l *List) IsEmpty(ctx context.Context) (bool, error)

IsEmpty return true if the list is empty, false otherwise.

func (*List) LastIndexOf added in v1.0.0 

func (l *List) LastIndexOf(ctx context.Context, element interface{}) (int, error)

LastIndexOf returns the index of the last occurrence of the given element in this list.

func (List) Name added in v1.4.0 

func (p List) Name() string

func (*List) Remove added in v1.0.0 

func (l *List) Remove(ctx context.Context, element interface{}) (bool, error)

Remove removes the given element from this list. Returns true if the list has changed as the result of this operation, false otherwise.

func (*List) RemoveAll added in v1.0.0 

func (l *List) RemoveAll(ctx context.Context, elements ...interface{}) (bool, error)

RemoveAll removes the given elements from the list. Returns true if the list has changed as the result of this operation, false otherwise.

func (*List) RemoveAt added in v1.0.0 

func (l *List) RemoveAt(ctx context.Context, index int) (interface{}, error)

RemoveAt removes the element at the given index. Returns the removed element.

func (*List) RemoveListener added in v1.0.0 

func (l *List) RemoveListener(ctx context.Context, subscriptionID types.UUID) error

RemoveListener removes the item listener with the given subscription ID.

func (*List) RetainAll added in v1.0.0 

func (l *List) RetainAll(ctx context.Context, elements ...interface{}) (bool, error)

RetainAll removes all elements from this list except the ones contained in the given slice. Returns true if the list has changed as a result of this operation, false otherwise.

func (*List) Set added in v1.0.0 

func (l *List) Set(ctx context.Context, index int, element interface{}) (interface{}, error)

Set replaces the element at the specified index in this list with the specified element. Returns the previous element from the list.

func (*List) Size added in v1.0.0 

func (l *List) Size(ctx context.Context) (int, error)

Size returns the number of elements in this list.

func (*List) SubList added in v1.0.0 

func (l *List) SubList(ctx context.Context, start int, end int) ([]interface{}, error)

SubList returns a view of this list that contains elements between index numbers from start (inclusive) to end (exclusive).

type ListItemNotified added in v1.0.0 

type ListItemNotified struct {
	Value     interface{}
	ListName  string
	Member    cluster.MemberInfo
	EventType ItemEventType
}

ListItemNotified describes the List item event. Member may have the zero value of cluster.MemberInfo if the member is not known at the time the corresponding callback runs. You can check that situation by checking whether Member.UUID is the default UUID.

func (ListItemNotified) EventName added in v1.0.0 

func (q ListItemNotified) EventName() string

EventName returns generic event name, common for all List item listeners.

type ListItemNotifiedHandler added in v1.0.0 

type ListItemNotifiedHandler func(event *ListItemNotified)

ListItemNotifiedHandler is a handler function for the List item listener.

type LocalMapStats added in v1.3.0 

type LocalMapStats struct {
	NearCacheStats nearcache.Stats
}

type Map added in v1.0.0 

type Map struct {
	// contains filtered or unexported fields
}

Map is a distributed map. Hazelcast Go client enables you to perform operations like reading and writing from/to a Hazelcast Map with methods like Get and Put. For details, see https://docs.hazelcast.com/imdg/latest/data-structures/map.html

Listening for Map Events

To listen events of a map, you can use the AddListener, AddListenerWithKey, AddListenerWithPredicate and AddListenerWithPredicateAndKey methods. The first method adds a listener to the map's all events. The others filter the events depending on a key and/or a predicate. In all methods you specify whether you want to include value in the event or not.

You can pass a MapListener struct to these methods to add handlers to different event types. You can add different handlers to different event types with a single MapListener struct. If you don't specify a handler in for an event type in MapListener struct, there will be no handler for that event. In the example below, a listener for added and updated entry events is created. Entries only with key "somekey" and matching to predicate year > 2000 are considered: 

entryListenerConfig := hazelcast.MapEntryListenerConfig{
	Key: "somekey",
	Predicate: predicate.Greater("year", 2000),
	IncludeValue: true,
}

m, err := client.GetMap(ctx, "somemap")
// error checking is omitted.
subscriptionID, err := m.AddListenerWithPredicateAndKey(ctx, hazelcast.MapListener{
	EntryAdded: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Added:", event.Value)
	},
	EntryRemoved: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Removed:", event.Value)
	},
}, predicate.Greater("year", 2000), "somekey", true)
// error checking is omitted.

Adding an event listener returns a subscription ID, which you can later use to remove the listener: 

err = m.RemoveListener(ctx, subscriptionID)

Using Locks

You can lock entries in a Map. When an entry is locked, only the owner of that lock can access that entry in the cluster until it is unlocked by the owner of force unlocked. See https://docs.hazelcast.com/imdg/latest/data-structures/map.html#locking-maps for details.

Locks are reentrant. The owner of a lock can acquire the lock again without waiting for the lock to be unlocked. If the key is locked N times, it should be unlocked N times before another goroutine can acquire it.

Lock ownership in Hazelcast Go Client is explicit. The first step to own a lock is creating a lock context, which is similar to a key. The lock context is a regular context.Context which carry a special value that uniquely identifies the lock context in the cluster. Once the lock context is created, it can be used to lock/unlock entries and used with any function that is lock aware, such as Put. 

m, err := client.GetMap(ctx, "my-map")
lockCtx := m.NewLockContext(ctx)
// block acquiring the lock
err = m.Lock(lockCtx, "some-key")
// pass lock context to use the locked entry
err = m.Set(lockCtx, "some-key", "some-value")
// release the lock once done with it
err = m.Unlock(lockCtx, "some-key")

As mentioned before, lock context is a regular context.Context which carry a special lock ID. You can pass any context.Context to any Map function, but in that case lock ownership between operations using the same hazelcast.Client instance is not possible.

Using the Near Cache

Map entries in Hazelcast are partitioned across the cluster members. Hazelcast clients do not have local data at all. Suppose you read the key k a number of times from a Hazelcast client or k is owned by another member in your cluster. Then each map.Get(k) will be a remote operation, which creates a lot of network trips. If you have a data structure that is mostly read, then you should consider creating a local Near Cache, so that reads are sped up and less network traffic is created.

These benefits do not come for free. See the following trade-offs:

  • Clients with a Near Cache has to hold the extra cached data, which increases memory consumption.
  • If invalidation is enabled and entries are updated frequently, then invalidations will be costly.
  • Near Cache breaks the strong consistency guarantees; you might be reading stale data.

Near Cache is highly recommended for data structures that are mostly read.

You must enable the Near Cache on the client, without the need to configure it on the server. Note that Near Cache configuration is specific to the server or client itself. A data structure on a server may not have Near Cache configured while the same data structure on a client may have Near Cache configured. They also can have different Near Cache configurations.

If you are using the Near Cache, you should take into account that your hits to the keys in the Near Cache are not reflected as hits to the original keys on the primary members. This has for example an impact on Map's maximum idle seconds or time-to-live seconds expiration. Therefore, even though there is a hit on a key in Near Cache, your original key on the primary member may expire.

Note: Near Cache works only when you access data via map.Get(k). Data returned using a predicate or an SQL query is not stored in the Near Cache.

Checkout the nearcache package for configuration options.

Warning: Storing keys in serialized form is required when the key cannot be compared for equality, such as slices. That can be accomplished by setting SerializeKeys: true, shown in the example below: 

ncc := nearcache.Config{
	Name: "mymap*",
	SerializeKeys: true
}

The following types cannot be used as keys without setting SerializeKeys==true:

  • Maps
  • Slices
  • Structs with having at least one field with an incomparable type.

Following Map methods support the Near Cache:

  • Clear
  • ContainsKey
  • Delete
  • Evict
  • EvictAll
  • ExecuteOnKey
  • ExecuteOnKeys
  • Get
  • GetAll
  • LoadAllReplacing
  • LoadAllWithoutReplacing
  • LocalMapStats
  • Put
  • PutWithMaxIdle
  • PutWithTTL
  • PutWithTTLAndMaxIdle
  • PutAll
  • PutIfAbsent
  • PutIfAbsentWithTTL
  • PutIfAbsentWithTTLAndMaxIdle
  • PutTransient
  • PutTransientWithMaxIdle
  • PutTransientWithTTL
  • PutTransientWithTTLAndMaxIdle
  • Remove
  • RemoveIfSame
  • RemoveAll
  • Replace
  • ReplaceIfSame
  • Set
  • SetWithTTL
  • SetWithTTLAndMaxIdle
  • TryPut
  • TryPutWithTimeout
  • TryRemove
  • TryRemoveWithTimeout
Example 
ctx := context.TODO()
client, err := hazelcast.StartNewClient(ctx)
if err != nil {
	log.Fatal(err)
}
// Retrieve a map.
peopleMap, err := client.GetMap(ctx, "people")
if err != nil {
	log.Fatal(err)
}
// Call map functions.
err = peopleMap.Set(ctx, "jane", "doe")
if err != nil {
	log.Fatal(err)
}
// Stop the client once you are done with it.
client.Shutdown(ctx)

Output:

func (*Map) AddEntryListener added in v1.0.0 

func (m *Map) AddEntryListener(ctx context.Context, config MapEntryListenerConfig, handler EntryNotifiedHandler) (types.UUID, error)

AddEntryListener adds a continuous entry listener to this map. Deprecated: In favor of AddListener, AddListenerWithKey, AddListenerWithPredicate, AddListenerWithPredicateAndKey methods.

Example 
// error handling was omitted for brevity
ctx := context.TODO()
client, err := hazelcast.StartNewClient(ctx)
if err != nil {
	log.Fatal(err)
}
entryListenerConfig := hazelcast.MapEntryListenerConfig{
	IncludeValue: true,
}
m, err := client.GetMap(ctx, "somemap")
if err != nil {
	log.Fatal(err)
}
// enable receiving entry added events
entryListenerConfig.NotifyEntryAdded(true)
// enable receiving entry removed events
entryListenerConfig.NotifyEntryRemoved(true)
// enable receiving entry updated events
entryListenerConfig.NotifyEntryUpdated(true)
// enable receiving entry evicted events
entryListenerConfig.NotifyEntryEvicted(true)
// enable receiving entry loaded events
entryListenerConfig.NotifyEntryLoaded(true)
subscriptionID, err := m.AddEntryListener(ctx, entryListenerConfig, func(event *hazelcast.EntryNotified) {
	switch event.EventType {
	// this is an entry added event
	case hazelcast.EntryAdded:
		fmt.Println("Entry Added:", event.Key)
	// this is an entry removed event
	case hazelcast.EntryRemoved:
		fmt.Println("Entry Removed:", event.Key)
	// this is an entry updated event
	case hazelcast.EntryUpdated:
		fmt.Println("Entry Updated:", event.Key)
	// this is an entry evicted event
	case hazelcast.EntryEvicted:
		fmt.Println("Entry Evicted:", event.Key)
	// this is an entry loaded event
	case hazelcast.EntryLoaded:
		fmt.Println("Entry Loaded:", event.Key)
	}
})
if err != nil {
	log.Fatal(err)
}
// performing modifications on the map entries
key := strconv.Itoa(int(time.Now().Unix()))
if err := m.Set(ctx, key, "1"); err != nil {
	log.Fatal(err)
}
if err := m.Set(ctx, key, "2"); err != nil {
	log.Fatal(err)
}
if err := m.Delete(ctx, key); err != nil {
	log.Fatal(err)
}
// you can use the subscriptionID later to remove the event listener.
if err := m.RemoveEntryListener(ctx, subscriptionID); err != nil {
	log.Fatal(err)
}

Output:

func (*Map) AddIndex added in v1.0.0 

func (m *Map) AddIndex(ctx context.Context, indexConfig types.IndexConfig) error

AddIndex adds an index to this map for the specified entries so that queries can run faster.

func (*Map) AddInterceptor added in v1.0.0 

func (m *Map) AddInterceptor(ctx context.Context, interceptor interface{}) (string, error)

AddInterceptor adds an interceptor for this map.

func (*Map) AddListener added in v1.3.0 

func (m *Map) AddListener(ctx context.Context, listener MapListener, includeValue bool) (types.UUID, error)

AddListener adds a continuous entry listener to this map.

Example 
// error handling was omitted for brevity
ctx := context.TODO()
client, err := hazelcast.StartNewClient(ctx)
if err != nil {
	log.Fatal(err)
}
m, err := client.GetMap(ctx, "somemap")
if err != nil {
	log.Fatal(err)
}
subscriptionID, err := m.AddListener(ctx, hazelcast.MapListener{
	EntryAdded: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Added:", event.Key)
	},
	EntryUpdated: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Updated:", event.Key)
	},
	EntryRemoved: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Removed:", event.Key)
	},
	EntryEvicted: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Evicted:", event.Key)
	},
	EntryLoaded: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Loaded:", event.Key)
	},
}, true)
if err != nil {
	log.Fatal(err)
}
// performing modifications on the map entries
key := strconv.Itoa(int(time.Now().Unix()))
if err := m.Set(ctx, key, "1"); err != nil {
	log.Fatal(err)
}
if err := m.Set(ctx, key, "2"); err != nil {
	log.Fatal(err)
}
if err := m.Delete(ctx, key); err != nil {
	log.Fatal(err)
}
// you can use the subscriptionID later to remove the event listener.
if err := m.RemoveListener(ctx, subscriptionID); err != nil {
	log.Fatal(err)
}

Output:

func (*Map) AddListenerWithKey added in v1.3.0 

func (m *Map) AddListenerWithKey(ctx context.Context, listener MapListener, key interface{}, includeValue bool) (types.UUID, error)

AddListenerWithKey adds a continuous entry listener on a specific key to this map.

Example 
// error handling was omitted for brevity
ctx := context.TODO()
client, err := hazelcast.StartNewClient(ctx)
if err != nil {
	log.Fatal(err)
}
m, err := client.GetMap(ctx, "somemap")
if err != nil {
	log.Fatal(err)
}
key := strconv.Itoa(int(time.Now().Unix()))

subscriptionID, err := m.AddListenerWithKey(ctx, hazelcast.MapListener{
	EntryAdded: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Added:", event.Key)
	},
	EntryUpdated: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Updated:", event.Key)
	},
	EntryRemoved: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Removed:", event.Key)
	},
	EntryEvicted: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Evicted:", event.Key)
	},
	EntryLoaded: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Loaded:", event.Key)
	},
}, key, true)
if err != nil {
	log.Fatal(err)
}
// performing modifications on the map entries
if err := m.Set(ctx, key, "1"); err != nil {
	log.Fatal(err)
}
if err := m.Set(ctx, key, "2"); err != nil {
	log.Fatal(err)
}
if err := m.Delete(ctx, key); err != nil {
	log.Fatal(err)
}
// you can use the subscriptionID later to remove the event listener.
if err := m.RemoveListener(ctx, subscriptionID); err != nil {
	log.Fatal(err)
}

Output:

func (*Map) AddListenerWithPredicate added in v1.3.0 

func (m *Map) AddListenerWithPredicate(ctx context.Context, listener MapListener, predicate predicate.Predicate, includeValue bool) (types.UUID, error)

AddListenerWithPredicate adds a continuous entry listener to this map. Events are filtered by a predicate.

Example 
// error handling was omitted for brevity
ctx := context.TODO()
client, err := hazelcast.StartNewClient(ctx)
if err != nil {
	log.Fatal(err)
}
m, err := client.GetMap(ctx, "somemap")
if err != nil {
	log.Fatal(err)
}
subscriptionID, err := m.AddListenerWithPredicate(ctx, hazelcast.MapListener{
	EntryAdded: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Added:", event.Key)
	},
	EntryUpdated: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Updated:", event.Key)
	},
	EntryRemoved: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Removed:", event.Key)
	},
	EntryEvicted: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Evicted:", event.Key)
	},
	EntryLoaded: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Loaded:", event.Key)
	},
}, predicate.True(), true)
if err != nil {
	log.Fatal(err)
}
// performing modifications on the map entries
key := strconv.Itoa(int(time.Now().Unix()))
if err := m.Set(ctx, key, "1"); err != nil {
	log.Fatal(err)
}
if err := m.Set(ctx, key, "2"); err != nil {
	log.Fatal(err)
}
if err := m.Delete(ctx, key); err != nil {
	log.Fatal(err)
}
// you can use the subscriptionID later to remove the event listener.
if err := m.RemoveListener(ctx, subscriptionID); err != nil {
	log.Fatal(err)
}

Output:

func (*Map) AddListenerWithPredicateAndKey added in v1.3.0 

func (m *Map) AddListenerWithPredicateAndKey(ctx context.Context, listener MapListener, predicate predicate.Predicate, key interface{}, includeValue bool) (types.UUID, error)

AddListenerWithPredicateAndKey adds a continuous entry listener on a specific key to this map. Events are filtered by a predicate.

Example 
// error handling was omitted for brevity
ctx := context.TODO()
client, err := hazelcast.StartNewClient(ctx)
if err != nil {
	log.Fatal(err)
}
m, err := client.GetMap(ctx, "somemap")
if err != nil {
	log.Fatal(err)
}
key := strconv.Itoa(int(time.Now().Unix()))

subscriptionID, err := m.AddListenerWithPredicateAndKey(ctx, hazelcast.MapListener{
	EntryAdded: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Added:", event.Key)
	},
	EntryUpdated: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Updated:", event.Key)
	},
	EntryRemoved: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Removed:", event.Key)
	},
	EntryEvicted: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Evicted:", event.Key)
	},
	EntryLoaded: func(event *hazelcast.EntryNotified) {
		fmt.Println("Entry Loaded:", event.Key)
	},
}, predicate.True(), key, true)
if err != nil {
	log.Fatal(err)
}
// performing modifications on the map entries
if err := m.Set(ctx, key, "1"); err != nil {
	log.Fatal(err)
}
if err := m.Set(ctx, key, "2"); err != nil {
	log.Fatal(err)
}
if err := m.Delete(ctx, key); err != nil {
	log.Fatal(err)
}
// you can use the subscriptionID later to remove the event listener.
if err := m.RemoveListener(ctx, subscriptionID); err != nil {
	log.Fatal(err)
}

Output:

func (*Map) Aggregate added in v1.0.0 

func (m *Map) Aggregate(ctx context.Context, agg aggregate.Aggregator) (interface{}, error)

Aggregate runs the given aggregator and returns the result.

Example 
ctx := context.TODO()
client, err := hazelcast.StartNewClient(ctx)
if err != nil {
	log.Fatal(err)
}
myMap, err := client.GetMap(ctx, "my-map")
if err != nil {
	log.Fatal(err)
}
if err = myMap.Set(ctx, "k1", serialization.JSON(`{"A": "foo", "B": 10}`)); err != nil {
	log.Fatal(err)
}
if err = myMap.Set(ctx, "k2", serialization.JSON(`{"A": "bar", "B": 30}`)); err != nil {
	log.Fatal(err)
}
result, err := myMap.Aggregate(ctx, aggregate.LongSum("B"))
if err != nil {
	log.Fatal(err)
}
fmt.Println(result)

Output:

func (*Map) AggregateWithPredicate added in v1.0.0 

func (m *Map) AggregateWithPredicate(ctx context.Context, agg aggregate.Aggregator, pred predicate.Predicate) (interface{}, error)

AggregateWithPredicate runs the given aggregator and returns the result. The result is filtered with the given predicate.

func (*Map) Clear added in v1.0.0 

func (m *Map) Clear(ctx context.Context) error

Clear deletes all entries one by one and fires related events.

func (*Map) ContainsKey added in v1.0.0 

func (m *Map) ContainsKey(ctx context.Context, key interface{}) (bool, error)

ContainsKey returns true if the map contains an entry with the given key.

func (*Map) ContainsValue added in v1.0.0 

func (m *Map) ContainsValue(ctx context.Context, value interface{}) (bool, error)

ContainsValue returns true if the map contains an entry with the given value.

func (*Map) Delete added in v1.0.0 

func (m *Map) Delete(ctx context.Context, key interface{}) error

Delete removes the mapping for a key from this map if it is present. Unlike remove(object), this operation does not return the removed value, which avoids the serialization cost of the returned value. If the removed value will not be used, a delete operation is preferred over a remove operation for better performance.

func (Map) Destroy added in v1.0.0 

func (p Map) Destroy(ctx context.Context) error

Destroy removes this object cluster-wide. Clears and releases all resources for this object.

func (*Map) Evict added in v1.0.0 

func (m *Map) Evict(ctx context.Context, key interface{}) (bool, error)

Evict evicts the mapping for a key from this map. Returns true if the key is evicted.

func (*Map) EvictAll added in v1.0.0 

func (m *Map) EvictAll(ctx context.Context) error

EvictAll deletes all entries without firing related events.

func (*Map) ExecuteOnEntries added in v1.0.0 

func (m *Map) ExecuteOnEntries(ctx context.Context, entryProcessor interface{}) ([]types.Entry, error)

ExecuteOnEntries applies the user defined EntryProcessor to all the entries in the map.

func (*Map) ExecuteOnEntriesWithPredicate added in v1.1.1 

func (m *Map) ExecuteOnEntriesWithPredicate(ctx context.Context, entryProcessor interface{}, pred predicate.Predicate) ([]types.Entry, error)

ExecuteOnEntriesWithPredicate applies the user defined EntryProcessor to all the entries in the map which satisfies the predicate.

func (*Map) ExecuteOnKey added in v1.2.0 

func (m *Map) ExecuteOnKey(ctx context.Context, entryProcessor interface{}, key interface{}) (interface{}, error)

ExecuteOnKey applies the user defined EntryProcessor to the entry with the specified key in the map.

func (*Map) ExecuteOnKeys added in v1.2.0 

func (m *Map) ExecuteOnKeys(ctx context.Context, entryProcessor interface{}, keys ...interface{}) ([]interface{}, error)

ExecuteOnKeys applies the user defined EntryProcessor to the entries with the specified keys in the map.

func (*Map) Flush added in v1.0.0 

func (m *Map) Flush(ctx context.Context) error

Flush flushes all the local dirty entries.

func (*Map) ForceUnlock added in v1.0.0 

func (m *Map) ForceUnlock(ctx context.Context, key interface{}) error

ForceUnlock releases the lock for the specified key regardless of the lock owner. It always successfully unlocks the key, never blocks, and returns immediately.

func (*Map) Get added in v1.0.0 

func (m *Map) Get(ctx context.Context, key interface{}) (interface{}, error)

Get returns the value for the specified key, or nil if this map does not contain this key. Warning: This method returns a clone of original value, modifying the returned value does not change the actual value in the map. One should put modified value back to make changes visible to all nodes.

func (*Map) GetAll added in v1.0.0 

func (m *Map) GetAll(ctx context.Context, keys ...interface{}) ([]types.Entry, error)

GetAll returns the entries for the given keys.

func (*Map) GetEntrySet added in v1.0.0 

func (m *Map) GetEntrySet(ctx context.Context) ([]types.Entry, error)

GetEntrySet returns a clone of the mappings contained in this map.

func (*Map) GetEntrySetWithPredicate added in v1.0.0 

func (m *Map) GetEntrySetWithPredicate(ctx context.Context, predicate predicate.Predicate) ([]types.Entry, error)

GetEntrySetWithPredicate returns a clone of the mappings contained in this map.

Example 
// Start the client with defaults
ctx := context.TODO()
client, err := hazelcast.StartNewClient(ctx)
if err != nil {
	log.Fatal(err)
}
// Get a random map
m, err := client.GetMap(ctx, "map-1")
if err != nil {
	log.Fatal(err)
}
// Populate the map, error handling is omitted here for brevity
m.Put(ctx, "key-1", serialization.JSON(`{"property: 5}`))
m.Put(ctx, "key-2", serialization.JSON(`{"property": 10}`))
m.Put(ctx, "key-3", serialization.JSON(`{"property": 15}`))
// Filter the entries in the map based on a predicate and print those
pred := predicate.And(predicate.Less("property", 12), predicate.Greater("property", 8))
entries, err := m.GetEntrySetWithPredicate(ctx, pred)
if err != nil {
	log.Fatal(err)
}
fmt.Println(entries)
// Shutdown client
client.Shutdown(ctx)

Output:

func (*Map) GetEntryView added in v1.0.0 

func (m *Map) GetEntryView(ctx context.Context, key interface{}) (*types.SimpleEntryView, error)

GetEntryView returns the SimpleEntryView for the specified key. If there is no entry view for the key, nil is returned.

func (*Map) GetKeySet added in v1.0.0 

func (m *Map) GetKeySet(ctx context.Context) ([]interface{}, error)

GetKeySet returns keys contained in this map.

func (*Map) GetKeySetWithPredicate added in v1.0.0 

func (m *Map) GetKeySetWithPredicate(ctx context.Context, predicate predicate.Predicate) ([]interface{}, error)

GetKeySetWithPredicate returns keys contained in this map.

func (*Map) GetValues added in v1.0.0 

func (m *Map) GetValues(ctx context.Context) ([]interface{}, error)

GetValues returns a list clone of the values contained in this map.

func (*Map) GetValuesWithPredicate added in v1.0.0 

func (m *Map) GetValuesWithPredicate(ctx context.Context, predicate predicate.Predicate) ([]interface{}, error)

GetValuesWithPredicate returns a list clone of the values contained in this map.

func (*Map) IsEmpty added in v1.0.0 

func (m *Map) IsEmpty(ctx context.Context) (bool, error)

IsEmpty returns true if this map contains no key-value mappings.

func (*Map) IsLocked added in v1.0.0 

func (m *Map) IsLocked(ctx context.Context, key interface{}) (bool, error)

IsLocked checks the lock for the specified key.

func (*Map) LoadAllReplacing added in v1.0.0 

func (m *Map) LoadAllReplacing(ctx context.Context, keys ...interface{}) error

LoadAllReplacing loads all keys from the store at server side or loads the given keys if provided. Replaces existing keys.

func (*Map) LoadAllWithoutReplacing added in v1.0.0 

func (m *Map) LoadAllWithoutReplacing(ctx context.Context, keys ...interface{}) error

LoadAllWithoutReplacing loads all keys from the store at server side or loads the given keys if provided.

func (*Map) LocalMapStats added in v1.3.0 

func (m *Map) LocalMapStats() LocalMapStats

func (*Map) Lock added in v1.0.0 

func (m *Map) Lock(ctx context.Context, key interface{}) error

Lock acquires the lock for the specified key infinitely. If the lock is not available, the current goroutine is blocked until the lock is acquired using the same lock context.

You get a lock whether the value is present in the map or not. Other goroutines or threads on other systems would block on their invoke of Lock until the non-existent key is unlocked. If the lock holder introduces the key to the map, the Put operation is not blocked. If a goroutine not holding a lock on the non-existent key tries to introduce the key while a lock exists on the non-existent key, the Put operation blocks until it is unlocked.

Scope of the lock is this Map only. Acquired lock is only for the key in this map.

Locks are re-entrant. If the key is locked N times, it should be unlocked N times before another goroutine can acquire it.

func (*Map) LockWithLease added in v1.0.0 

func (m *Map) LockWithLease(ctx context.Context, key interface{}, leaseTime time.Duration) error

LockWithLease acquires the lock for the specified lease time. Otherwise, it behaves the same as Lock function.

func (Map) Name added in v1.4.0 

func (p Map) Name() string

func (*Map) NewLockContext added in v1.0.0 

func (m *Map) NewLockContext(ctx context.Context) context.Context

NewLockContext augments the passed parent context with a unique lock ID. If passed context is nil, context.Background is used as the parent context.

Example 
// lockAndIncrement locks the given key, reads the value from it and sets back the incremented value.
lockAndIncrement := func(myMap *hazelcast.Map, key string, wg *sync.WaitGroup) {
	// Signal completion before this goroutine exits.
	defer wg.Done()
	intValue := int64(0)
	// Create a new unique lock context.
	lockCtx := myMap.NewLockContext(context.Background())
	// Lock the key.
	// The key cannot be unlocked without the same lock context.
	if err := myMap.Lock(lockCtx, key); err != nil {
		panic(err)
	}
	// Remember to unlock the key, otherwise it won't be accessible elsewhere.
	defer myMap.Unlock(lockCtx, key)
	// The same lock context, or a derived one from that lock context must be used,
	// otherwise the Get operation below will block.
	v, err := myMap.Get(lockCtx, key)
	if err != nil {
		panic(err)
	}
	// If v is not nil, then there's already a value for the key.
	if v != nil {
		intValue = v.(int64)
	}
	// Increment and set the value back.
	intValue++
	// The same lock context, or a derived one from that lock context must be used,
	// otherwise the Set operation below will block.
	if err = myMap.Set(lockCtx, key, intValue); err != nil {
		panic(err)
	}
}

const goroutineCount = 100
const key = "counter"

ctx := context.TODO()
client, err := hazelcast.StartNewClient(ctx)
if err != nil {
	log.Fatal(err)
}
// Get a random map.
myMap, err := client.GetMap(ctx, "map")
if err != nil {
	log.Fatal(err)
}
// Lock and increment the value stored in key for goroutineCount times.
wg := &sync.WaitGroup{}
wg.Add(goroutineCount)
for i := 0; i < goroutineCount; i++ {
	go lockAndIncrement(myMap, key, wg)
}
// Wait for all goroutines to complete.
wg.Wait()
// Retrieve the final value.
// A lock context is not needed, since the key is unlocked.
if lastValue, err := myMap.Get(context.Background(), key); err != nil {
	panic(err)
} else {
	fmt.Println("lastValue", lastValue)
}
client.Shutdown(ctx)

Output:

func (*Map) Put added in v1.0.0 

func (m *Map) Put(ctx context.Context, key interface{}, value interface{}) (interface{}, error)

Put sets the value for the given key and returns the old value.

func (*Map) PutAll added in v1.0.0 

func (m *Map) PutAll(ctx context.Context, entries ...types.Entry) error

PutAll copies all the mappings from the specified map to this map. No atomicity guarantees are given. In the case of a failure, some key-value tuples may get written, while others are not.

func (*Map) PutIfAbsent added in v1.0.0 

func (m *Map) PutIfAbsent(ctx context.Context, key interface{}, value interface{}) (interface{}, error)

PutIfAbsent associates the specified key with the given value if it is not already associated.

func (*Map) PutIfAbsentWithTTL added in v1.0.0 

func (m *Map) PutIfAbsentWithTTL(ctx context.Context, key interface{}, value interface{}, ttl time.Duration) (interface{}, error)

PutIfAbsentWithTTL associates the specified key with the given value if it is not already associated. Entry will expire and get evicted after the ttl.

func (*Map) PutIfAbsentWithTTLAndMaxIdle added in v1.0.0 

func (m *Map) PutIfAbsentWithTTLAndMaxIdle(ctx context.Context, key interface{}, value interface{}, ttl time.Duration, maxIdle time.Duration) (interface{}, error)

PutIfAbsentWithTTLAndMaxIdle associates the specified key with the given value if it is not already associated. Entry will expire and get evicted after the ttl. Given max idle time (maximum time for this entry to stay idle in the map) is used.

func (*Map) PutTransient added in v1.0.0 

func (m *Map) PutTransient(ctx context.Context, key interface{}, value interface{}) error

PutTransient sets the value for the given key. MapStore defined at the server side will not be called. The TTL defined on the server-side configuration will be used. Max idle time defined on the server-side configuration will be used.

func (*Map) PutTransientWithMaxIdle added in v1.0.0 

func (m *Map) PutTransientWithMaxIdle(ctx context.Context, key interface{}, value interface{}, maxIdle time.Duration) error

PutTransientWithMaxIdle sets the value for the given key. MapStore defined at the server side will not be called. Given max idle time (maximum time for this entry to stay idle in the map) is used. Set maxIdle to 0 for infinite idle time.

func (*Map) PutTransientWithTTL added in v1.0.0 

func (m *Map) PutTransientWithTTL(ctx context.Context, key interface{}, value interface{}, ttl time.Duration) error

PutTransientWithTTL sets the value for the given key. MapStore defined at the server side will not be called. Given TTL (maximum time in seconds for this entry to stay in the map) is used. Set ttl to 0 for infinite timeout.

func (*Map) PutTransientWithTTLAndMaxIdle added in v1.0.0 

func (m *Map) PutTransientWithTTLAndMaxIdle(ctx context.Context, key interface{}, value interface{}, ttl time.Duration, maxIdle time.Duration) error

PutTransientWithTTLAndMaxIdle sets the value for the given key. MapStore defined at the server side will not be called. Given TTL (maximum time in seconds for this entry to stay in the map) is used. Set ttl to 0 for infinite timeout. Given max idle time (maximum time for this entry to stay idle in the map) is used. Set maxIdle to 0 for infinite idle time.

func (*Map) PutWithMaxIdle added in v1.0.0 

func (m *Map) PutWithMaxIdle(ctx context.Context, key interface{}, value interface{}, maxIdle time.Duration) (interface{}, error)

PutWithMaxIdle sets the value for the given key and returns the old value. maxIdle is the maximum time in seconds for this entry to stay idle in the map.

func (*Map) PutWithTTL added in v1.0.0 

func (m *Map) PutWithTTL(ctx context.Context, key interface{}, value interface{}, ttl time.Duration) (interface{}, error)

PutWithTTL sets the value for the given key and returns the old value. Entry will expire and get evicted after the ttl.

func (*Map) PutWithTTLAndMaxIdle added in v1.0.0 

func (m *Map) PutWithTTLAndMaxIdle(ctx context.Context, key interface{}, value interface{}, ttl time.Duration, maxIdle time.Duration) (interface{}, error)

PutWithTTLAndMaxIdle sets the value for the given key and returns the old value. Entry will expire and get evicted after the ttl. maxIdle is the maximum time in seconds for this entry to stay idle in the map.

func (*Map) Remove added in v1.0.0 

func (m *Map) Remove(ctx context.Context, key interface{}) (interface{}, error)

Remove deletes the value for the given key and returns it.

func (*Map) RemoveAll added in v1.0.0 

func (m *Map) RemoveAll(ctx context.Context, predicate predicate.Predicate) error

RemoveAll deletes all entries matching the given predicate.

func (*Map) RemoveEntryListener added in v1.0.0 

func (m *Map) RemoveEntryListener(ctx context.Context, subscriptionID types.UUID) error

RemoveEntryListener removes the specified entry listener.

func (*Map) RemoveIfSame added in v1.0.0 

func (m *Map) RemoveIfSame(ctx context.Context, key interface{}, value interface{}) (bool, error)

RemoveIfSame removes the entry for a key only if it is currently mapped to a given value. Returns true if the entry was removed.

func (*Map) RemoveInterceptor added in v1.0.0 

func (m *Map) RemoveInterceptor(ctx context.Context, registrationID string) (bool, error)

RemoveInterceptor removes the interceptor.

func (*Map) RemoveListener added in v1.3.0 

func (m *Map) RemoveListener(ctx context.Context, subscriptionID types.UUID) error

RemoveListener removes the specified entry listener.

func (*Map) Replace added in v1.0.0 

func (m *Map) Replace(ctx context.Context, key interface{}, value interface{}) (interface{}, error)

Replace replaces the entry for a key only if it is currently mapped to some value and returns the previous value.

func (*Map) ReplaceIfSame added in v1.0.0 

func (m *Map) ReplaceIfSame(ctx context.Context, key interface{}, oldValue interface{}, newValue interface{}) (bool, error)

ReplaceIfSame replaces the entry for a key only if it is currently mapped to a given value. Returns true if the value was replaced.

func (*Map) Set added in v1.0.0 

func (m *Map) Set(ctx context.Context, key interface{}, value interface{}) error

Set sets the value for the given key.

func (*Map) SetTTL added in v1.0.0 

func (m *Map) SetTTL(ctx context.Context, key interface{}, ttl time.Duration) error

SetTTL updates the TTL value of the entry specified by the given key with a new TTL value. Given TTL (maximum time in seconds for this entry to stay in the map) is used. Set ttl to 0 for infinite timeout.

func (*Map) SetTTLAffected added in v1.2.0 

func (m *Map) SetTTLAffected(ctx context.Context, key interface{}, ttl time.Duration) (bool, error)

SetTTLAffected updates the TTL value of the entry specified by the given key with a new TTL value. Given TTL (maximum time in seconds for this entry to stay in the map) is used. Returns true if entry is affected. Set ttl to 0 for infinite timeout.

func (*Map) SetWithTTL added in v1.0.0 

func (m *Map) SetWithTTL(ctx context.Context, key interface{}, value interface{}, ttl time.Duration) error

SetWithTTL sets the value for the given key. Given TTL (maximum time in seconds for this entry to stay in the map) is used. Set ttl to 0 for infinite timeout.

func (*Map) SetWithTTLAndMaxIdle added in v1.0.0 

func (m *Map) SetWithTTLAndMaxIdle(ctx context.Context, key, value interface{}, ttl time.Duration, maxIdle time.Duration) error

SetWithTTLAndMaxIdle sets the value for the given key. Given TTL (maximum time in seconds for this entry to stay in the map) is used. Set ttl to 0 for infinite timeout. Given max idle time (maximum time for this entry to stay idle in the map) is used. Set maxIdle to 0 for infinite idle time.

func (*Map) Size added in v1.0.0 

func (m *Map) Size(ctx context.Context) (int, error)

Size returns the number of entries in this map.

func (*Map) TryLock added in v1.0.0 

func (m *Map) TryLock(ctx context.Context, key interface{}) (bool, error)

TryLock tries to acquire the lock for the specified key. When the lock is not available, the current goroutine doesn't wait and returns false immediately.

func (*Map) TryLockWithLease added in v1.0.0 

func (m *Map) TryLockWithLease(ctx context.Context, key interface{}, lease time.Duration) (bool, error)

TryLockWithLease tries to acquire the lock for the specified key. Lock will be released after lease time passes.

func (*Map) TryLockWithLeaseAndTimeout added in v1.0.0 

func (m *Map) TryLockWithLeaseAndTimeout(ctx context.Context, key interface{}, lease time.Duration, timeout time.Duration) (bool, error)

TryLockWithLeaseAndTimeout tries to acquire the lock for the specified key. The current goroutine is blocked until the lock is acquired using the same lock context, or he specified waiting time elapses. Lock will be released after lease time passes.

func (*Map) TryLockWithTimeout added in v1.0.0 

func (m *Map) TryLockWithTimeout(ctx context.Context, key interface{}, timeout time.Duration) (bool, error)

TryLockWithTimeout tries to acquire the lock for the specified key. The current goroutine is blocked until the lock is acquired using the same lock context, or he specified waiting time elapses.

func (*Map) TryPut added in v1.0.0 

func (m *Map) TryPut(ctx context.Context, key interface{}, value interface{}) (bool, error)

TryPut tries to put the given key and value into this map and returns immediately.

func (*Map) TryPutWithTimeout added in v1.0.0 

func (m *Map) TryPutWithTimeout(ctx context.Context, key interface{}, value interface{}, timeout time.Duration) (bool, error)

TryPutWithTimeout tries to put the given key and value into this map and waits until operation is completed or the given timeout is reached.

func (*Map) TryRemove added in v1.0.0 

func (m *Map) TryRemove(ctx context.Context, key interface{}) (interface{}, error)

TryRemove tries to remove the given key from this map and returns immediately.

func (*Map) TryRemoveWithTimeout added in v1.0.0 

func (m *Map) TryRemoveWithTimeout(ctx context.Context, key interface{}, timeout time.Duration) (interface{}, error)

TryRemoveWithTimeout tries to remove the given key from this map and waits until operation is completed or timeout is reached.

func (*Map) Unlock added in v1.0.0 

func (m *Map) Unlock(ctx context.Context, key interface{}) error

Unlock releases the lock for the specified key.

type MapEntryListenerConfig added in v1.0.0 

type MapEntryListenerConfig struct {
	Predicate predicate.Predicate
	Key       interface{}

	IncludeValue bool
	// contains filtered or unexported fields
}

MapEntryListenerConfig contains configuration for a map entry listener.

func (*MapEntryListenerConfig) NotifyEntryAdded added in v1.0.0 

func (c *MapEntryListenerConfig) NotifyEntryAdded(enable bool)

NotifyEntryAdded enables receiving an entry event when an entry is added. Deprecated: See AddEntryListener's deprecation notice.

func (*MapEntryListenerConfig) NotifyEntryAllCleared added in v1.0.0 

func (c *MapEntryListenerConfig) NotifyEntryAllCleared(enable bool)

NotifyEntryAllCleared enables receiving an entry event when all entries are cleared. Deprecated: See AddEntryListener's deprecation notice.

func (*MapEntryListenerConfig) NotifyEntryAllEvicted added in v1.0.0 

func (c *MapEntryListenerConfig) NotifyEntryAllEvicted(enable bool)

NotifyEntryAllEvicted enables receiving an entry event when all entries are evicted. Deprecated: See AddEntryListener's deprecation notice.

func (*MapEntryListenerConfig) NotifyEntryEvicted added in v1.0.0 

func (c *MapEntryListenerConfig) NotifyEntryEvicted(enable bool)

NotifyEntryEvicted enables receiving an entry event when an entry is evicted. Deprecated: See AddEntryListener's deprecation notice.

func (*MapEntryListenerConfig) NotifyEntryExpired added in v1.0.0 

func (c *MapEntryListenerConfig) NotifyEntryExpired(enable bool)

NotifyEntryExpired enables receiving an entry event when an entry is expired. Deprecated: See AddEntryListener's deprecation notice.

func (*MapEntryListenerConfig) NotifyEntryInvalidated added in v1.0.0 

func (c *MapEntryListenerConfig) NotifyEntryInvalidated(enable bool)

NotifyEntryInvalidated enables receiving an entry event when an entry is invalidated. Deprecated: See AddEntryListener's deprecation notice.

func (*MapEntryListenerConfig) NotifyEntryLoaded added in v1.0.0 

func (c *MapEntryListenerConfig) NotifyEntryLoaded(enable bool)

NotifyEntryLoaded enables receiving an entry event when an entry is loaded. Deprecated: See AddEntryListener's deprecation notice.

func (*MapEntryListenerConfig) NotifyEntryMerged added in v1.0.0 

func (c *MapEntryListenerConfig) NotifyEntryMerged(enable bool)

NotifyEntryMerged enables receiving an entry event when an entry is merged. Deprecated: See AddEntryListener's deprecation notice.

func (*MapEntryListenerConfig) NotifyEntryRemoved added in v1.0.0 

func (c *MapEntryListenerConfig) NotifyEntryRemoved(enable bool)

NotifyEntryRemoved enables receiving an entry event when an entry is removed. Deprecated: See AddEntryListener's deprecation notice.

func (*MapEntryListenerConfig) NotifyEntryUpdated added in v1.0.0 

func (c *MapEntryListenerConfig) NotifyEntryUpdated(enable bool)

NotifyEntryUpdated enables receiving an entry event when an entry is updated. Deprecated: See AddEntryListener's deprecation notice.

type MapListener added in v1.3.0 

type MapListener struct {
	EntryAdded   func(event *EntryNotified)
	EntryRemoved func(event *EntryNotified)
	EntryUpdated func(event *EntryNotified)
	EntryEvicted func(event *EntryNotified)
	EntryExpired func(event *EntryNotified)
	MapEvicted   func(event *EntryNotified)
	MapCleared   func(event *EntryNotified)
	EntryMerged  func(event *EntryNotified)
	EntryLoaded  func(event *EntryNotified)
}

type MessagePublished added in v1.0.0 

type MessagePublished struct {
	PublishTime time.Time
	Value       interface{}
	TopicName   string
	Member      cluster.MemberInfo
}

MessagePublished contains information about a message published event. Member may have the zero value of cluster.MemberInfo if the member is not known at the time the corresponding callback runs. You can check that situation by checking whether Member.UUID is the default UUID.

func (*MessagePublished) EventName added in v1.0.0 

func (m *MessagePublished) EventName() string

type MultiMap added in v1.2.0 

type MultiMap struct {
	// contains filtered or unexported fields
}

MultiMap is a distributed map. Hazelcast Go client enables you to perform operations like reading and writing from/to a Hazelcast MultiMap with methods like Get and Put. For details, see https://docs.hazelcast.com/hazelcast/latest/data-structures/multimap.html

Using Locks

You can lock entries in a MultiMap. When an entry is locked, only the owner of that lock can access that entry in the cluster until it is unlocked by the owner of force unlocked. See https://docs.hazelcast.com/imdg/latest/data-structures/map.html#locking-maps for details, usage is identical.

Locks are reentrant. The owner of a lock can acquire the lock again without waiting for the lock to be unlocked. If the key is locked N times, it should be unlocked N times before another goroutine can acquire it.

Lock ownership in Hazelcast Go Client is explicit. The first step to own a lock is creating a lock context, which is similar to a key. The lock context is a regular context.Context which carry a special value that uniquely identifies the lock context in the cluster. Once the lock context is created, it can be used to lock/unlock entries and used with any function that is lock aware, such as Put. 

m, err := client.GetMultiMap(ctx, "my-map")
lockCtx := m.NewLockContext(ctx)
// block acquiring the lock
err = m.Lock(lockCtx, "some-key")
// pass lock context to use the locked entry
err = m.Put(lockCtx, "some-key", "some-value")
// release the lock once done with it
err = m.Unlock(lockCtx, "some-key")

As mentioned before, lock context is a regular context.Context which carry a special lock ID. You can pass any context.Context to any MultiMap function, but in that case lock ownership between operations using the same hazelcast.Client instance is not possible.

Example 
ctx := context.TODO()
client, err := hazelcast.StartNewClient(ctx)
if err != nil {
	log.Fatal(err)
}
// Retrieve a map.
peopleMap, err := client.GetMultiMap(ctx, "people")
if err != nil {
	log.Fatal(err)
}
// Call map functions.
success, err := peopleMap.Put(ctx, "jane", "doe")
if err != nil {
	log.Fatal(err)
}
if !success {
	log.Fatal("map operation failed")
}
// Add multiple values to existing key
if err = peopleMap.PutAll(ctx, "jane", "smith", "mason"); err != nil {
	log.Fatal(err)
}
values, err := peopleMap.Get(ctx, "jane")
if err != nil {
	log.Fatal(err)
}
// ["smith", "mason", "doe"] order of values may not be preserved
fmt.Println(values)
// Stop the client once you are done with it.
client.Shutdown(ctx)

Output:

func (*MultiMap) Clear added in v1.2.0 

func (m *MultiMap) Clear(ctx context.Context) error

Clear deletes all entries one by one and fires related events.

func (*MultiMap) ContainsEntry added in v1.2.0 

func (m *MultiMap) ContainsEntry(ctx context.Context, key interface{}, value interface{}) (bool, error)

ContainsEntry returns true if the multi-map contains an entry with the given key and value.

func (*MultiMap) ContainsKey added in v1.2.0 

func (m *MultiMap) ContainsKey(ctx context.Context, key interface{}) (bool, error)

ContainsKey returns true if the map contains an entry with the given key.

func (*MultiMap) ContainsValue added in v1.2.0 

func (m *MultiMap) ContainsValue(ctx context.Context, value interface{}) (bool, error)

ContainsValue returns true if the map contains an entry with the given value.

func (*MultiMap) Delete added in v1.2.0 

func (m *MultiMap) Delete(ctx context.Context, key interface{}) error

Delete removes the mapping for a key from this multi-map if it is present. Unlike remove(object), this operation does not return the removed value, which avoids the serialization cost of the returned value. If the removed value will not be used, delete operation is preferred over remove operation for better performance.

func (MultiMap) Destroy added in v1.2.0 

func (p MultiMap) Destroy(ctx context.Context) error

Destroy removes this object cluster-wide. Clears and releases all resources for this object.

func (*MultiMap) ForceUnlock added in v1.2.0 

func (m *MultiMap) ForceUnlock(ctx context.Context, key interface{}) error

ForceUnlock releases the lock for the specified key regardless of the lock owner. It always successfully unlocks the key, never blocks, and returns immediately.

func (*MultiMap) Get added in v1.2.0 

func (m *MultiMap) Get(ctx context.Context, key interface{}) ([]interface{}, error)

Get returns values for the specified key or an empty slice if this multi-map does not contain this key. Warning: This method returns a clone of original value, modifying the returned value does not change the actual value in the multi-map. One should put modified value back to make changes visible to all nodes.

func (*MultiMap) GetEntrySet added in v1.2.0 

func (m *MultiMap) GetEntrySet(ctx context.Context) ([]types.Entry, error)

GetEntrySet returns a clone of the mappings contained in this multi-map.

func (*MultiMap) GetKeySet added in v1.2.0 

func (m *MultiMap) GetKeySet(ctx context.Context) ([]interface{}, error)

GetKeySet returns keys contained in this map.

func (*MultiMap) GetValues added in v1.2.0 

func (m *MultiMap) GetValues(ctx context.Context) ([]interface{}, error)

GetValues returns a list clone of the values contained in this map.

func (*MultiMap) IsLocked added in v1.2.0 

func (m *MultiMap) IsLocked(ctx context.Context, key interface{}) (bool, error)

IsLocked checks the lock for the specified key.

func (*MultiMap) Lock added in v1.2.0 

func (m *MultiMap) Lock(ctx context.Context, key interface{}) error

Lock acquires the lock for the specified key infinitely. If the lock is not available, the current goroutine is blocked until the lock is acquired using the same lock context.

You get a lock whether the value is present in the multi-map or not. Other goroutines or threads on other systems would block on their invoke of Lock until the non-existent key is unlocked. If the lock holder introduces the key to the map, the Put operation is not blocked. If a goroutine not holding a lock on the non-existent key tries to introduce the key while a lock exists on the non-existent key, the Put operation blocks until it is unlocked.

Scope of the lock is this MultiMap only. Acquired lock is only for the key in this map.

Locks are re-entrant. If the key is locked N times, it should be unlocked N times before another goroutine can acquire it.

func (*MultiMap) LockWithLease added in v1.2.0 

func (m *MultiMap) LockWithLease(ctx context.Context, key interface{}, leaseTime time.Duration) error

LockWithLease acquires the lock for the specified lease time. Otherwise, it behaves the same as Lock function.

func (MultiMap) Name added in v1.4.0 

func (p MultiMap) Name() string

func (*MultiMap) NewLockContext added in v1.2.0 

func (m *MultiMap) NewLockContext(ctx context.Context) context.Context

NewLockContext augments the passed parent context with a unique lock ID. If passed context is nil, context.Background is used as the parent context.

func (*MultiMap) Put added in v1.2.0 

func (m *MultiMap) Put(ctx context.Context, key interface{}, value interface{}) (bool, error)

Put appends the value for the given key to the corresponding value list and returns if operation is successful.

func (*MultiMap) PutAll added in v1.2.0 

func (m *MultiMap) PutAll(ctx context.Context, key interface{}, values ...interface{}) error

PutAll appends given values to the value list of given key. No atomicity guarantees are given. In the case of a failure, some key-value tuples may get written, while others are not.

func (*MultiMap) Remove added in v1.2.0 

func (m *MultiMap) Remove(ctx context.Context, key interface{}) ([]interface{}, error)

Remove deletes all the values corresponding to the given key and returns them as a slice.

func (*MultiMap) RemoveEntry added in v1.2.0 

func (m *MultiMap) RemoveEntry(ctx context.Context, key interface{}, value interface{}) (bool, error)

RemoveEntry removes the specified value for the given key and returns true if call had an effect.

func (*MultiMap) Size added in v1.2.0 

func (m *MultiMap) Size(ctx context.Context) (int, error)

Size returns the number of entries in this multi-map.

func (*MultiMap) TryLock added in v1.2.0 

func (m *MultiMap) TryLock(ctx context.Context, key interface{}) (bool, error)

TryLock tries to acquire the lock for the specified key. When the lock is not available, the current goroutine doesn't wait and returns false immediately.

func (*MultiMap) TryLockWithLease added in v1.2.0 

func (m *MultiMap) TryLockWithLease(ctx context.Context, key interface{}, lease time.Duration) (bool, error)

TryLockWithLease tries to acquire the lock for the specified key. Lock will be released after lease time passes.

func (*MultiMap) TryLockWithLeaseAndTimeout added in v1.2.0 

func (m *MultiMap) TryLockWithLeaseAndTimeout(ctx context.Context, key interface{}, lease time.Duration, timeout time.Duration) (bool, error)

TryLockWithLeaseAndTimeout tries to acquire the lock for the specified key. The current goroutine is blocked until the lock is acquired using the same lock context, or he specified waiting time elapses. Lock will be released after lease time passes.

func (*MultiMap) TryLockWithTimeout added in v1.2.0 

func (m *MultiMap) TryLockWithTimeout(ctx context.Context, key interface{}, timeout time.Duration) (bool, error)

TryLockWithTimeout tries to acquire the lock for the specified key. The current goroutine is blocked until the lock is acquired using the same lock context, or he specified waiting time elapses.

func (*MultiMap) Unlock added in v1.2.0 

func (m *MultiMap) Unlock(ctx context.Context, key interface{}) error

Unlock releases the lock for the specified key.

func (*MultiMap) ValueCount added in v1.2.0 

func (m *MultiMap) ValueCount(ctx context.Context, key interface{}) (int, error)

ValueCount returns the number of values that match the given key in the multi-map.

type NearCacheInvalidationConfig added in v1.3.0 

type NearCacheInvalidationConfig struct {
	// contains filtered or unexported fields
}

NearCacheInvalidationConfig contains invalidation configuration for all Near Caches.

func (NearCacheInvalidationConfig) Clone added in v1.3.0 

func (pc NearCacheInvalidationConfig) Clone() NearCacheInvalidationConfig

Clone returns a copy of the configuration.

func (NearCacheInvalidationConfig) MarshalJSON added in v1.3.0 

func (pc NearCacheInvalidationConfig) MarshalJSON() ([]byte, error)

MarshalJSON marshals the configuration to JSON.

func (NearCacheInvalidationConfig) MaxToleratedMissCount added in v1.3.0 

func (pc NearCacheInvalidationConfig) MaxToleratedMissCount() int

MaxToleratedMissCount is the number of miss counts before data in Near Cache is invalidated.

func (*NearCacheInvalidationConfig) ReconciliationIntervalSeconds added in v1.3.0 

func (pc *NearCacheInvalidationConfig) ReconciliationIntervalSeconds() int

ReconciliationIntervalSeconds is the time in seconds for the reconciliation task interval.

func (*NearCacheInvalidationConfig) SetMaxToleratedMissCount added in v1.3.0 

func (pc *NearCacheInvalidationConfig) SetMaxToleratedMissCount(count int)

SetMaxToleratedMissCount sets the max tolerated miss count. Max tolerated miss count is the number of miss counts before data in Near Cache is invalidated. Default is 10.

func (*NearCacheInvalidationConfig) SetReconciliationIntervalSeconds added in v1.3.0 

func (pc *NearCacheInvalidationConfig) SetReconciliationIntervalSeconds(seconds int)

SetReconciliationIntervalSeconds sets the reconciliation interval. Reconciliation interval is the time for the reconciliation task interval. Configuring a value of zero seconds disables the reconciliation task.

func (*NearCacheInvalidationConfig) UnmarshalJSON added in v1.3.0 

func (pc *NearCacheInvalidationConfig) UnmarshalJSON(b []byte) error

UnmarshalJSON unmarshals the configuration from JSON.

func (NearCacheInvalidationConfig) Validate added in v1.3.0 

func (pc NearCacheInvalidationConfig) Validate() error

Validate validates the configuration and replaces missing configuration with defaults.

type OverflowPolicy added in v1.4.0 

type OverflowPolicy int

OverflowPolicy Using this OverflowPolicy one can control the behavior what should to be done when an item is about to be added to the Ringbuffer, but there is {@code 0} remaining capacity. Overflowing happens when a time-to-live is set and the oldest item in the Ringbuffer (the head) is not old enough to expire. 

const (
	// OverflowPolicyOverwrite
	// Using this OverflowPolicyOverwrite policy the oldest item is overwritten no matter it is not old enough to retire.
	// Using this policy you are sacrificing the time-to-live in favor of being able to write.
	//
	// Example: if there is a time-to-live of 30 seconds, the buffer is full and the oldest item in the ring has been placed a second ago, then there are 29 seconds remaining for that item.
	// Using this policy you are going to overwrite no matter what.
	OverflowPolicyOverwrite OverflowPolicy = 0
	// OverflowPolicyFail
	// Using this policy the call will fail immediately and the oldest item will not be overwritten before it is old enough to retire.
	// So this policy sacrificing the ability to write in favor of time-to-live.
	//
	// The advantage of OverflowPolicyFail is that the caller can decide what to do since it doesn't trap the thread due to backoff.
	//
	// Example: if there is a time-to-live of 30 seconds, the buffer is full and the oldest item in the ring has been placed a second ago, then there are 29 seconds remaining for that item.
	// Using this policy you are not going to overwrite that item for the next 29 seconds.
	OverflowPolicyFail OverflowPolicy = 1
)

type PNCounter added in v1.0.0 

type PNCounter struct {
	// contains filtered or unexported fields
}

PNCounter is a PN (Positive-Negative) CRDT counter.

The counter supports adding and subtracting values as well as retrieving the current counter value. Each replica of this counter can perform operations locally without coordination with the other replicas, thus increasing availability. The counter guarantees that whenever two nodes have received the same set of updates, possibly in a different order, their state is identical, and any conflicting updates are merged automatically. If no new updates are made to the shared state, all nodes that can communicate will eventually have the same data.

When invoking updates from the client, the invocation is remote. This may lead to indeterminate state - the update may be applied but the response has not been received. In this case, the caller will be notified with hzerrors.ErrTargetDisconnected.

The read and write methods provide monotonic read and RYW (read-your-write) guarantees. These guarantees are session guarantees which means that if no replica with the previously observed state is reachable, the session guarantees are lost and the method invocation will return hzerrors.ErrConsistencyLostException. This does not mean that an update is lost. All of the updates are part of some replica and will be eventually reflected in the state of all other replicas. This error just means that you cannot observe your own writes because all replicas that contain your updates are currently unreachable. After you receive hzerrors.ErrConsistencyLostException, you can either wait for a sufficiently up-to-date replica to become reachable in which case the session can be continued or you can reset the session by calling the Reset function. If you have called the Reset function, a new session is started with the next invocation to a CRDT replica.

Note that The CRDT state is kept entirely on non-lite (data) members. If there aren't any and the methods here are invoked on a lite member, they will fail with hzerrors.ErrNoDataMember.

For details see https://docs.hazelcast.com/imdg/latest/data-structures/pn-counter.html

Example 
ctx := context.TODO()
client, err := hazelcast.StartNewClient(ctx)
if err != nil {
	log.Fatal(err)
}
// Retrieve the PN counter named my-pn.
pn, err := client.GetPNCounter(ctx, "my-pn")
if err != nil {
	log.Fatal(err)
}
// Add the given value and retrieve the result.
_, err = pn.AddAndGet(ctx, 43)
if err != nil {
	log.Fatal(err)
}
// Decrement the given value and retrieve the result.
value, err := pn.DecrementAndGet(ctx)
if err != nil {
	log.Fatal(err)
}
fmt.Println(value)

Output:

func (*PNCounter) AddAndGet added in v1.0.0 

func (pn *PNCounter) AddAndGet(ctx context.Context, delta int64) (int64, error)

AddAndGet adds the given value to the current value and returns the updated value.

func (*PNCounter) DecrementAndGet added in v1.0.0 

func (pn *PNCounter) DecrementAndGet(ctx context.Context) (int64, error)

DecrementAndGet decrements the counter value by one and returns the updated value.

func (PNCounter) Destroy added in v1.0.0 

func (p PNCounter) Destroy(ctx context.Context) error

Destroy removes this object cluster-wide. Clears and releases all resources for this object.

func (*PNCounter) Get added in v1.0.0 

func (pn *PNCounter) Get(ctx context.Context) (int64, error)

Get returns the current value of the counter.

func (*PNCounter) GetAndAdd added in v1.0.0 

func (pn *PNCounter) GetAndAdd(ctx context.Context, delta int64) (int64, error)

GetAndAdd adds the given value to the current value and returns the previous value.

func (*PNCounter) GetAndDecrement added in v1.0.0 

func (pn *PNCounter) GetAndDecrement(ctx context.Context) (int64, error)

GetAndDecrement decrements the counter value by one and returns the previous value.

func (*PNCounter) GetAndIncrement added in v1.0.0 

func (pn *PNCounter) GetAndIncrement(ctx context.Context) (int64, error)

GetAndIncrement increments the counter value by one and returns the previous value.

func (*PNCounter) GetAndSubtract added in v1.0.0 

func (pn *PNCounter) GetAndSubtract(ctx context.Context, delta int64) (int64, error)

GetAndSubtract subtracts the given value from the current value and returns the previous value.

func (*PNCounter) IncrementAndGet added in v1.0.0 

func (pn *PNCounter) IncrementAndGet(ctx context.Context) (int64, error)

IncrementAndGet increments the counter value by one and returns the updated value.

func (PNCounter) Name added in v1.4.0 

func (p PNCounter) Name() string

func (*PNCounter) Reset added in v1.0.0 

func (pn *PNCounter) Reset()

Reset resets the observed state by this PN counter.

func (*PNCounter) SubtractAndGet added in v1.0.0 

func (pn *PNCounter) SubtractAndGet(ctx context.Context, delta int64) (int64, error)

SubtractAndGet subtracts the given value from the current value and returns the updated value.

type Queue added in v1.0.0 

type Queue struct {
	// contains filtered or unexported fields
}

Queue is a concurrent, blocking, distributed, observable queue.

Queue is not a partitioned data-structure. All of the Queue content is stored in a single machine (and in the backup). Queue will not scale by adding more members in the cluster.

For details see https://docs.hazelcast.com/imdg/latest/data-structures/queue.html

Example 
ctx := context.TODO()
client, err := hazelcast.StartNewClient(ctx)
if err != nil {
	log.Fatal(err)
}
// Get a random queue
q, err := client.GetQueue(ctx, "queue-1")
if err != nil {
	log.Fatal(err)
}
// Add an item to the queue if space is available (non-blocking)
added, err := q.Add(ctx, "item 1")
if err != nil {
	log.Fatal(err)
}
if added {
	fmt.Println("Added item 1")
}
// Get the head of the queue if available and print item
item, err := q.Poll(ctx)
if err != nil {
	log.Fatal(err)
}
fmt.Println(item)
// Add an item waiting for capacity until timeout
added, err = q.AddWithTimeout(ctx, "item 2", 2*time.Second)
if err != nil {
	log.Fatal(err)
}
if added {
	fmt.Println("Added item 2")
}
// Wait indefinetely to add an item
err = q.Put(ctx, "item 3")
if err != nil {
	log.Fatal(err)
}
// Wait indefintely to take the head and print item
item, err = q.Take(ctx)
if err != nil {
	log.Fatal(err)
}
fmt.Println(item)
// Shutdown client
client.Shutdown(ctx)

Output:

func (*Queue) Add added in v1.0.0 

func (q *Queue) Add(ctx context.Context, value interface{}) (bool, error)

Add adds the specified item to this queue if there is available space. Returns true when element is successfully added

func (*Queue) AddAll added in v1.0.0 

func (q *Queue) AddAll(ctx context.Context, values ...interface{}) (bool, error)

AddAll adds the elements in the specified collection to this queue. Returns true if the queue is changed after the call.

func (*Queue) AddItemListener added in v1.0.0 

func (q *Queue) AddItemListener(ctx context.Context, includeValue bool, handler QueueItemNotifiedHandler) (types.UUID, error)

AddItemListener adds an item listener for this queue. Listener will be notified for all queue add/remove events. Received events include the updated item if includeValue is true.

func (*Queue) AddWithTimeout added in v1.0.0 

func (q *Queue) AddWithTimeout(ctx context.Context, value interface{}, timeout time.Duration) (bool, error)

AddWithTimeout adds the specified item to this queue if there is available space. Returns true when element is successfully added

func (*Queue) Clear added in v1.0.0 

func (q *Queue) Clear(ctx context.Context) error

Clear Clear this queue. Queue will be empty after this call.

func (*Queue) Contains added in v1.0.0 

func (q *Queue) Contains(ctx context.Context, value interface{}) (bool, error)

Contains returns true if the queue includes the given value.

func (*Queue) ContainsAll added in v1.0.0 

func (q *Queue) ContainsAll(ctx context.Context, values ...interface{}) (bool, error)

ContainsAll returns true if the queue includes all given values.

func (Queue) Destroy added in v1.0.0 

func (p Queue) Destroy(ctx context.Context) error

Destroy removes this object cluster-wide. Clears and releases all resources for this object.

func (*Queue) Drain added in v1.0.0 

func (q *Queue) Drain(ctx context.Context) ([]interface{}, error)

Drain returns all items in the queue and empties it.

func (*Queue) DrainWithMaxSize added in v1.0.0 

func (q *Queue) DrainWithMaxSize(ctx context.Context, maxSize int) ([]interface{}, error)

DrainWithMaxSize returns maximum maxSize items in tne queue and removes returned items from the queue.

func (*Queue) GetAll added in v1.0.0 

func (q *Queue) GetAll(ctx context.Context) ([]interface{}, error)

GetAll returns all of the items in this queue.

func (*Queue) IsEmpty added in v1.0.0 

func (q *Queue) IsEmpty(ctx context.Context) (bool, error)

IsEmpty returns true if the queue is empty.

func (Queue) Name added in v1.4.0 

func (p Queue) Name() string

func (*Queue) Peek added in v1.0.0 

func (q *Queue) Peek(ctx context.Context) (interface{}, error)

Peek retrieves the head of queue without removing it from the queue.

func (*Queue) Poll added in v1.0.0 

func (q *Queue) Poll(ctx context.Context) (interface{}, error)

Poll retrieves and removes the head of this queue.

func (*Queue) PollWithTimeout added in v1.0.0 

func (q *Queue) PollWithTimeout(ctx context.Context, timeout time.Duration) (interface{}, error)

PollWithTimeout retrieves and removes the head of this queue. Waits until this timeout elapses and returns the result.

func (*Queue) Put added in v1.0.0 

func (q *Queue) Put(ctx context.Context, value interface{}) error

Put adds the specified element into this queue. If there is no space, it waits until necessary space becomes available.

func (*Queue) RemainingCapacity added in v1.0.0 

func (q *Queue) RemainingCapacity(ctx context.Context) (int, error)

RemainingCapacity returns the remaining capacity of this queue.

func (*Queue) Remove added in v1.0.0 

func (q *Queue) Remove(ctx context.Context, value interface{}) (bool, error)

Remove removes the specified element from the queue if it exists.

func (*Queue) RemoveAll added in v1.0.0 

func (q *Queue) RemoveAll(ctx context.Context, values ...interface{}) (bool, error)

RemoveAll removes all of the elements of the specified collection from this queue.

func (*Queue) RemoveListener added in v1.0.0 

func (q *Queue) RemoveListener(ctx context.Context, subscriptionID types.UUID) error

RemoveListener removes the specified listener.

func (*Queue) RetainAll added in v1.0.0 

func (q *Queue) RetainAll(ctx context.Context, values ...interface{}) (bool, error)

RetainAll removes the items which are not contained in the specified collection.

func (*Queue) Size added in v1.0.0 

func (q *Queue) Size(ctx context.Context) (int, error)

Size returns the number of elements in this collection.

func (*Queue) Take added in v1.0.0 

func (q *Queue) Take(ctx context.Context) (interface{}, error)

Take retrieves and removes the head of this queue, if necessary, waits until an item becomes available.

type QueueItemNotified added in v1.0.0 

type QueueItemNotified struct {
	Value     interface{}
	QueueName string
	Member    cluster.MemberInfo
	EventType ItemEventType
}

QueueItemNotified contains information about an item notified event. Member may have the zero value of cluster.MemberInfo if the member is not known at the time the corresponding callback runs. You can check that situation by checking whether Member.UUID is the default UUID.

func (QueueItemNotified) EventName added in v1.0.0 

func (q QueueItemNotified) EventName() string

type QueueItemNotifiedHandler added in v1.0.0 

type QueueItemNotifiedHandler func(event *QueueItemNotified)

QueueItemNotifiedHandler is called when an item notified event is generated for a Queue.

type ReadResultSet added in v1.4.0 

type ReadResultSet struct {
	// contains filtered or unexported fields
}

ReadResultSet is used as return type in ReadMany() operations from a Ringbuffer

func (*ReadResultSet) Get added in v1.4.0 

func (rrs *ReadResultSet) Get(index int) (interface{}, error)

Get gets the item at the given index.

func (*ReadResultSet) GetNextSequenceToReadFrom added in v1.4.0 

func (rrs *ReadResultSet) GetNextSequenceToReadFrom() int64

GetNextSequenceToReadFrom returns sequence number of the item following the last read item. This sequence can then be used to read items following the ones returned by this result set. Usually this sequence is equal to the sequence used to retrieve this result set incremented by the ReadCount. In cases when the reader tolerates lost items, this is not the case. For instance, if the reader requests an item with a stale sequence (one which has already been overwritten), the read will jump to the oldest sequence and read from there. Similarly, if the reader requests an item in the future (e.g. because the partition was lost and the reader was unaware of this), the read method will jump back to the newest available sequence. Because of these jumps and only in the case when the reader is loss tolerant, the next sequence must be retrieved using this method. A return value of ReadResultSetSequenceUnavailable means that the information is not available.

func (*ReadResultSet) GetSequence added in v1.4.0 

func (rrs *ReadResultSet) GetSequence(index int) (int64, error)

GetSequence returns the sequence number for the item at the given index.

func (*ReadResultSet) ReadCount added in v1.4.0 

func (rrs *ReadResultSet) ReadCount() int32

ReadCount returns the number of items that have been read before filtering. If no filter is set, then the ReadCount will be equal to Size. But if a filter is applied, it could be that items are read, but are filtered out. So if you are trying to make another read based on the ReadResultSet, then you should increment the sequence by ReadCount and not by Size. Otherwise, you will be re-reading the filtered messages.

func (*ReadResultSet) Size added in v1.4.0 

func (rrs *ReadResultSet) Size() int

Size returns the result set size. See also ReadCount.

type ReplicatedMap added in v1.0.0 

type ReplicatedMap struct {
	// contains filtered or unexported fields
}

ReplicatedMap is a distributed key-value data structure where the data is replicated to all members in the cluster. It provides full replication of entries to all members for high speed access.

See https://docs.hazelcast.com/imdg/latest/data-structures/replicated-map.html for details.

Example 
ctx := context.TODO()
client, err := hazelcast.StartNewClient(ctx)
if err != nil {
	log.Fatal(err)
}
// Get a random replicated map
replicatedMap, err := client.GetReplicatedMap(ctx, "replicated-map-1")
if err != nil {
	log.Fatal(err)
}
// Populate map
replacedValue, err := replicatedMap.Put(ctx, "key", "value")
if err != nil {
	log.Fatal(err)
}
fmt.Println(replacedValue)
// Get value and print
value, err := replicatedMap.Get(ctx, "key")
if err != nil {
	log.Fatal(err)
}
fmt.Println(value)
// Shutdown client
client.Shutdown(ctx)

Output:

func (*ReplicatedMap) AddEntryListener added in v1.0.0 

func (m *ReplicatedMap) AddEntryListener(ctx context.Context, handler EntryNotifiedHandler) (types.UUID, error)

AddEntryListener adds a continuous entry listener to this map.

func (*ReplicatedMap) AddEntryListenerToKey added in v1.0.0 

func (m *ReplicatedMap) AddEntryListenerToKey(ctx context.Context, key interface{}, handler EntryNotifiedHandler) (types.UUID, error)

AddEntryListenerToKey adds a continuous entry listener to this map.

func (*ReplicatedMap) AddEntryListenerToKeyWithPredicate added in v1.0.0 

func (m *ReplicatedMap) AddEntryListenerToKeyWithPredicate(ctx context.Context, key interface{}, predicate predicate.Predicate, handler EntryNotifiedHandler) (types.UUID, error)

AddEntryListenerToKeyWithPredicate adds a continuous entry listener to this map.

func (*ReplicatedMap) AddEntryListenerWithPredicate added in v1.0.0 

func (m *ReplicatedMap) AddEntryListenerWithPredicate(ctx context.Context, predicate predicate.Predicate, handler EntryNotifiedHandler) (types.UUID, error)

AddEntryListenerWithPredicate adds a continuous entry listener to this map.

func (*ReplicatedMap) Clear added in v1.0.0 

func (m *ReplicatedMap) Clear(ctx context.Context) error

Clear deletes all entries one by one and fires related events

func (*ReplicatedMap) ContainsKey added in v1.0.0 

func (m *ReplicatedMap) ContainsKey(ctx context.Context, key interface{}) (bool, error)

ContainsKey returns true if the map contains an entry with the given key

func (*ReplicatedMap) ContainsValue added in v1.0.0 

func (m *ReplicatedMap) ContainsValue(ctx context.Context, value interface{}) (bool, error)

ContainsValue returns true if the map contains an entry with the given value

func (ReplicatedMap) Destroy added in v1.0.0 

func (p ReplicatedMap) Destroy(ctx context.Context) error

Destroy removes this object cluster-wide. Clears and releases all resources for this object.

func (*ReplicatedMap) Get added in v1.0.0 

func (m *ReplicatedMap) Get(ctx context.Context, key interface{}) (interface{}, error)

Get returns the value for the specified key, or nil if this map does not contain this key. This function returns a clone of original value, modifying the returned value does not change the actual value in the map. One should put modified value back to make changes visible to all nodes.

func (*ReplicatedMap) GetEntrySet added in v1.0.0 

func (m *ReplicatedMap) GetEntrySet(ctx context.Context) ([]types.Entry, error)

GetEntrySet returns a clone of the mappings contained in this map.

func (*ReplicatedMap) GetKeySet added in v1.0.0 

func (m *ReplicatedMap) GetKeySet(ctx context.Context) ([]interface{}, error)

GetKeySet returns keys contained in this map

func (*ReplicatedMap) GetValues added in v1.0.0 

func (m *ReplicatedMap) GetValues(ctx context.Context) ([]interface{}, error)

GetValues returns a list clone of the values contained in this map

func (*ReplicatedMap) IsEmpty added in v1.0.0 

func (m *ReplicatedMap) IsEmpty(ctx context.Context) (bool, error)

IsEmpty returns true if this map contains no key-value mappings.

func (ReplicatedMap) Name added in v1.4.0 

func (p ReplicatedMap) Name() string

func (*ReplicatedMap) Put added in v1.0.0 

func (m *ReplicatedMap) Put(ctx context.Context, key interface{}, value interface{}) (interface{}, error)

Put sets the value for the given key and returns the old value.

func (*ReplicatedMap) PutAll added in v1.0.0 

func (m *ReplicatedMap) PutAll(ctx context.Context, keyValuePairs ...types.Entry) error

PutAll copies all the mappings from the specified map to this map. No atomicity guarantees are given. In the case of a failure, some key-value tuples may get written, while others are not.

func (*ReplicatedMap) Remove added in v1.0.0 

func (m *ReplicatedMap) Remove(ctx context.Context, key interface{}) (interface{}, error)

Remove deletes the value for the given key and returns it.

func (*ReplicatedMap) RemoveEntryListener added in v1.0.0 

func (m *ReplicatedMap) RemoveEntryListener(ctx context.Context, subscriptionID types.UUID) error

RemoveEntryListener removes the specified entry listener.

func (*ReplicatedMap) Size added in v1.0.0 

func (m *ReplicatedMap) Size(ctx context.Context) (int, error)

Size returns the number of entries in this map.

type Ringbuffer added in v1.4.0 

type Ringbuffer struct {
	// contains filtered or unexported fields
}

A Ringbuffer is a data structure where the content is stored in a ring-like structure. A Ringbuffer has a capacity ,so it won't grow beyond that capacity and endanger the stability of the system. If that capacity is exceeded, then the oldest item in the Ringbuffer is overwritten. For details, see https://docs.hazelcast.com/hazelcast/latest/data-structures/ringbuffer

The Ringbuffer has two always-incrementing sequences:

  • TailSequence: This is the side where the youngest item is found. So the tail is the side of the Ringbuffer where items are added to.
  • HeadSequence: This is the side where the oldest items are found. So the head is the side where items get discarded.

The items in the Ringbuffer can be found by a sequence that is in between (inclusive) the head and tail sequence.

If data is read from a Ringbuffer with a sequence that is smaller than thehead sequence, it means that the data is not available anymore and a hzerrors.ErrStaleSequence is returned.

A Ringbuffer currently is a replicated, but not partitioned data structure. So all data is stored in a single partition, similarly to the Queue implementation.

A Ringbuffer can be used in a way similar to the Queue, but one of the key differences is that a Queue.take is destructive, meaning that only 1 thread is able to take an item. A ReadOne is not destructive, so you can have multiple threads reading the same item multiple times.

func (*Ringbuffer) Add added in v1.4.0 

func (rb *Ringbuffer) Add(ctx context.Context, item interface{}, overflowPolicy OverflowPolicy) (sequence int64, err error)

Add adds an item to the tail of the Ringbuffer. If there is space in the Ringbuffer, the call will return the sequence of the written item. If there is no space, it depends on the overflow policy what happens: - OverflowPolicyOverwrite: we just overwrite the oldest item in the Ringbuffer, and we violate the ttl - OverflowPolicyFail: FAIL we return -1. The reason that FAIL exist is to give the opportunity to obey the ttl.

This sequence will always be unique for this Ringbuffer instance, so it can be used as a unique id generator if you are publishing items on this Ringbuffer. However, you need to take care of correctly determining an initial id when any node uses the Ringbuffer for the first time. The most reliable way to do that is to write a dummy item into the Ringbuffer and use the returned sequence as initial id. On the reading side, this dummy item should be discarded. Please keep in mind that this id is not the sequence of the item you are about to publish but from a previously published item. So it can't be used to find that item.

Add returns the sequence number of the added item. You can read the added item using this number.

func (*Ringbuffer) AddAll added in v1.4.0 

func (rb *Ringbuffer) AddAll(ctx context.Context, overflowPolicy OverflowPolicy, items ...interface{}) (int64, error)

AddAll Adds all the items of a collection to the tail of the Ringbuffer. A addAll is likely to outperform multiple calls to add(Object) due to better io utilization and a reduced number of executed operations. If the batch is empty, the call is ignored. When the slice is not empty, the content is copied into a different data-structure. This means that: after this call completes, the slice can be re-used. If the slice is larger than the capacity of the Ringbuffer, then the items that were written first will be overwritten. Therefore, this call will not block. The items are inserted in the order of the slice. If an addAll is executed concurrently with an add or addAll, no guarantee is given that items are contiguous. The result contains the sequenceId of the last written item.

func (*Ringbuffer) Capacity added in v1.4.0 

func (rb *Ringbuffer) Capacity(ctx context.Context) (int64, error)

Capacity returns the capacity of this Ringbuffer.

func (Ringbuffer) Destroy added in v1.4.0 

func (p Ringbuffer) Destroy(ctx context.Context) error

Destroy removes this object cluster-wide. Clears and releases all resources for this object.

func (*Ringbuffer) HeadSequence added in v1.4.0 

func (rb *Ringbuffer) HeadSequence(ctx context.Context) (int64, error)

HeadSequence returns the sequence of the head. The head is the side of the Ringbuffer where the oldest items in the Ringbuffer are found. If the Ringbuffer is empty, the head will be one more than the tail. The initial value of the head is 0 (1 more than tail).

func (Ringbuffer) Name added in v1.4.0 

func (p Ringbuffer) Name() string

func (*Ringbuffer) ReadMany added in v1.4.0 

func (rb *Ringbuffer) ReadMany(ctx context.Context, startSequence int64, minCount int32, maxCount int32, filter interface{}) (ReadResultSet, error)

ReadMany reads a batch of items from the Ringbuffer. If the number of available items after the first read item is smaller than the maxCount, these items are returned. So it could be the number of items read is smaller than the maxCount. If there are fewer items available than minCount, then this call blacks. These blocking calls consume server memory and if there are many calls, it can be possible to see leaking memory or OOME. Reading a batch of items is likely to perform better because less overhead is involved. A filter can be provided to only select items that need to be read. If the filter is nil, all items are read. If the filter is not null, only items where the filter function returns true are returned. Using filters is a good way to prevent getting items that are of no value to the receiver. This reduces the amount of IO and the number of operations being executed, and can result in a significant performance improvement. If the startSequence is smaller than the smallest sequence still available in the Ringbuffer (HeadSequence}, then the smallest available sequence will be used as the start sequence and the minimum/maximum number of items will be attempted to be read from there on. If the startSequence is bigger than the last available sequence in the Ringbuffer (TailSequence), then the last available sequence plus one will be used as the start sequence and the call will block until further items become available and it can read at least the minimum number of items.

func (*Ringbuffer) ReadOne added in v1.4.0 

func (rb *Ringbuffer) ReadOne(ctx context.Context, sequence int64) (interface{}, error)

ReadOne Reads one item from the Ringbuffer. If the sequence is one beyond the current tail, this call blocks until an item is added. This method is not destructive unlike e.g. a queue.take. So the same item can be read by multiple readers, or it can be read multiple times by the same reader.

func (*Ringbuffer) RemainingCapacity added in v1.4.0 

func (rb *Ringbuffer) RemainingCapacity(ctx context.Context) (int64, error)

RemainingCapacity returns the remaining capacity of the Ringbuffer. The returned value could be stale as soon as it is returned. If ttl is not set, the remaining capacity will always be the capacity.

func (*Ringbuffer) Size added in v1.4.0 

func (rb *Ringbuffer) Size(ctx context.Context) (int64, error)

Size returns number of items in the Ringbuffer. If no ttl is set, the size will always be equal to capacity after the head completed the first loop-around the ring. This is because no items are getting retired.

func (*Ringbuffer) TailSequence added in v1.4.0 

func (rb *Ringbuffer) TailSequence(ctx context.Context) (int64, error)

TailSequence returns the sequence of the tail. The tail is the side of the Ringbuffer where the items are added to. The initial value of the tail is -1.

type Set added in v1.0.0 

type Set struct {
	// contains filtered or unexported fields
}

Set is a concurrent, distributed set implementation.

Hazelcast Set is a distributed set which does not allow duplicate elements. For details, see: https://docs.hazelcast.com/imdg/latest/data-structures/set.html

Example 
ctx := context.TODO()
client, err := hazelcast.StartNewClient(ctx)
if err != nil {
	log.Fatal(err)
}
// Retrieve the set named my-set.
set, err := client.GetSet(ctx, "my-set")
if err != nil {
	log.Fatal(err)
}
_, err = set.AddAll(ctx, "item1", "item2", "item3", "item2", "item1")
if err != nil {
	log.Fatal(err)
}
// Get the items. Note that there are no duplicates.
items, err := set.GetAll(ctx)
if err != nil {
	log.Fatal(err)
}
for _, item := range items {
	fmt.Println("Item:", item)
}

Output:

func (*Set) Add added in v1.0.0 

func (s *Set) Add(ctx context.Context, item interface{}) (bool, error)

Add adds the given item to the set. Returns true if the item was not already in the set.

func (*Set) AddAll added in v1.0.0 

func (s *Set) AddAll(ctx context.Context, values ...interface{}) (bool, error)

AddAll adds the elements in the specified collection to this set. Returns true if the set is changed after the call.

func (*Set) AddItemListener added in v1.0.0 

func (s *Set) AddItemListener(ctx context.Context, includeValue bool, handler SetItemNotifiedHandler) (types.UUID, error)

AddItemListener adds an item listener for this set. Listener will be notified for all set add/remove events. Received events include the updated item if includeValue is true.

func (*Set) Clear added in v1.0.0 

func (s *Set) Clear(ctx context.Context) error

Clear clears this set. Set will be empty after this call.

func (*Set) Contains added in v1.0.0 

func (s *Set) Contains(ctx context.Context, value interface{}) (bool, error)

Contains returns true if the set includes the given value.

func (*Set) ContainsAll added in v1.0.0 

func (s *Set) ContainsAll(ctx context.Context, values ...interface{}) (bool, error)

ContainsAll returns true if the set includes all given values.

func (Set) Destroy added in v1.0.0 

func (p Set) Destroy(ctx context.Context) error

Destroy removes this object cluster-wide. Clears and releases all resources for this object.

func (*Set) GetAll added in v1.0.0 

func (s *Set) GetAll(ctx context.Context) ([]interface{}, error)

GetAll returns the entries for the given keys.

func (*Set) IsEmpty added in v1.0.0 

func (s *Set) IsEmpty(ctx context.Context) (bool, error)

IsEmpty returns true if the set is empty.

func (Set) Name added in v1.4.0 

func (p Set) Name() string

func (*Set) Remove added in v1.0.0 

func (s *Set) Remove(ctx context.Context, value interface{}) (bool, error)

Remove removes the specified element from the set if it exists.

func (*Set) RemoveAll added in v1.0.0 

func (s *Set) RemoveAll(ctx context.Context, values ...interface{}) (bool, error)

RemoveAll removes all of the elements of the specified collection from this set. Returns true if the set was changed.

func (*Set) RemoveListener added in v1.0.0 

func (s *Set) RemoveListener(ctx context.Context, subscriptionID types.UUID) error

RemoveListener removes the specified listener.

func (*Set) RetainAll added in v1.0.0 

func (s *Set) RetainAll(ctx context.Context, values ...interface{}) (bool, error)

RetainAll removes the items which are not contained in the specified collection. Returns true if the set was changed.

func (*Set) Size added in v1.0.0 

func (s *Set) Size(ctx context.Context) (int, error)

Size returns the number of elements in this set.

type SetItemNotified added in v1.0.0 

type SetItemNotified struct {
	Value     interface{}
	SetName   string
	Member    cluster.MemberInfo
	EventType ItemEventType
}

SetItemNotified contains information about an item notified event. Member may have the zero value of cluster.MemberInfo if the member is not known at the time the corresponding callback runs. You can check that situation by checking whether Member.UUID is the default UUID.

func (SetItemNotified) EventName added in v1.0.0 

func (q SetItemNotified) EventName() string

type SetItemNotifiedHandler added in v1.0.0 

type SetItemNotifiedHandler func(event *SetItemNotified)

SetItemNotifiedHandler is called when an item notified event is generated for a Set.

type StatsConfig added in v1.0.0 

type StatsConfig struct {
	// Enabled enables collecting statistics.
	Enabled bool `json:",omitempty"`
	// Period is the period of statistics collection.
	Period types.Duration `json:",omitempty"`
}

StatsConfig contains configuration for Management Center.

func (*StatsConfig) Validate added in v1.0.0 

func (c *StatsConfig) Validate() error

Validate validates the stats configuration and replaces missing configuration with defaults.

type Topic added in v1.0.0 

type Topic struct {
	// contains filtered or unexported fields
}

Topic is a distribution mechanism for publishing messages that are delivered to multiple subscribers, which is also known as a publish/subscribe (pub/sub) messaging model.

Publish and subscriptions are cluster-wide. When a member subscribes for a topic, it is actually registering for messages published by any member in the cluster, including the new members joined after you added the listener.

Messages are ordered, meaning that listeners(subscribers) will process the messages in the order they are actually published.

Example 
// messageListener handles incoming messages to the topic
messageListener := func(event *hazelcast.MessagePublished) {
	fmt.Println("Received message: ", event.Value)
}
messageCount := 10
// Start the client with defaults
ctx := context.TODO()
client, err := hazelcast.StartNewClient(ctx)
if err != nil {
	log.Fatal(err)
}
// Get a random topic
rand.Seed(time.Now().Unix())
topicName := fmt.Sprintf("sample-%d", rand.Int())
topic, err := client.GetTopic(ctx, topicName)
if err != nil {
	log.Fatal(err)
}
// Add a message listener to the topic
topic.AddMessageListener(ctx, messageListener)
// Publish messages to topic
for i := 0; i < messageCount; i++ {
	topic.Publish(ctx, fmt.Sprintf("Message %d", i))
}
// Shutdown client
client.Shutdown(ctx)

Output:

func (*Topic) AddMessageListener added in v1.0.0 

func (t *Topic) AddMessageListener(ctx context.Context, handler TopicMessageHandler) (types.UUID, error)

AddMessageListener adds a subscriber to this topic.

func (Topic) Destroy added in v1.0.0 

func (p Topic) Destroy(ctx context.Context) error

Destroy removes this object cluster-wide. Clears and releases all resources for this object.

func (Topic) Name added in v1.4.0 

func (p Topic) Name() string

func (*Topic) Publish added in v1.0.0 

func (t *Topic) Publish(ctx context.Context, message interface{}) error

Publish publishes the given message to all subscribers of this topic.

func (*Topic) PublishAll added in v1.0.0 

func (t *Topic) PublishAll(ctx context.Context, messages ...interface{}) error

PublishAll publishes all given messages to all subscribers of this topic.

func (*Topic) RemoveListener added in v1.0.0 

func (t *Topic) RemoveListener(ctx context.Context, subscriptionID types.UUID) error

RemoveListener removes the given subscription from this topic.

type TopicMessageHandler added in v1.0.0 

type TopicMessageHandler func(event *MessagePublished)

Source Files

View all Source files

Directories

Path Synopsis
Package aggregate provides aggregation functions.
 Package aggregate provides aggregation functions.
Package cluster contains functions and types needed to connect to a Hazelcast cluster.
 Package cluster contains functions and types needed to connect to a Hazelcast cluster.
discovery
examples
cloud
cluster/failover
cp
distributedobject/events
flake_id_generator
list
logger/custom_logger
map
map/context
map/execute_on_key
map/execute_predicate
map/lock
map/nearcache/custom_eviction_comparator
map/nearcache/json_config
map/nearcache/programmatic_config
map/set_with_ttl
multimap
multimap/batch_operations
multimap/forceunlock
multimap/lock_trylock
portrange/default
portrange/specific
query
queue
replicated_map
ringbuffer
security/credentials
serialization/compact
serialization/custom
serialization/portable
set
sql/client-api/advanced_query_options
sql/client-api/employee
sql/driver/advanced_query_options
sql/driver/cloud_ssl
sql/driver/employee
sql/driver/json
sql/driver/ping
ssl/mutual_authentication
ssl/simple
topic
Package hzerrors provides sentinel errors.
 Package hzerrors provides sentinel errors.
cb
check
client
cloud
cluster
cp
cp/types
event
hzerrors
invocation
it
it/skip
lifecycle
logger
murmur
nearcache
proto
proto/codec
* Copyright (c) 2008-2021, Hazelcast, Inc.
 * Copyright (c) 2008-2021, Hazelcast, Inc.
proxy
rest
security
serialization
serialization/compatibility
soak_tests/map
sql
sql/driver
sql/types
stats
Package logger contains logging related API.
 Package logger contains logging related API.
Package nearcache contains the configuration and data types for the Near Cache.
 Package nearcache contains the configuration and data types for the Near Cache.
Package predicate provides built-in predicates to use with distributed queries.
 Package predicate provides built-in predicates to use with distributed queries.
Package serialization contains serialization functions and types for Hazelcast Go client.
 Package serialization contains serialization functions and types for Hazelcast Go client.
sql
driver
Package driver provides a standard database/sql compatible SQL driver for Hazelcast.
 Package driver provides a standard database/sql compatible SQL driver for Hazelcast.
Package types contains various helper types.
 Package types contains various helper types.

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