hazelcast

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 Go to latest Published: Apr 13, 2022 License: Apache-2.0 Imports: 30 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 to 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.
  • Hazelcast Cloud integration.
  • 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 1.16 and 1.17.

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 Client with Hazelcast Cloud

You only need the cluster name and Hazelcast cloud token to start the client. If you haven't already, you can sign up for a free Hazelcast Cloud account.

config := hazelcast.Config{}
cc := &config.Cluster
cc.Name = "YOUR HAZELCAST CLOUD CLUSTER NAME"
cc.Cloud.Enabled = true
cc.Cloud.Token = "YOUR HAZELCAST CLOUD TOKEN"
client, err := hazelcast.StartNewClientWithConfig(ctx, config)
// handle the error
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 IMDG 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

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"
	ServiceNameSet              = "hz:impl:setService"
	ServiceNamePNCounter        = "hz:impl:PNCounterService"
	ServiceNameFlakeIDGenerator = "hz:impl:flakeIdGeneratorService"
)
View Source 
const (
	ClientVersion = internal.ClientVersion
)

Variables

This section is empty.

Functions

This section is empty.

Types

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) 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) 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 {
	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"`
	// 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) Clone added in v1.0.0 

func (c *Config) Clone() Config

Clone returns a copy of the configuration.

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) 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) Validate added in v1.1.0 

func (f *FlakeIDGeneratorConfig) Validate() error

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) 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 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 Entry Events

The first step of listening to entry-based events is creating an instance of MapEntryListenerConfig. MapEntryListenerConfig contains options to filter the events by key and/or predicate and has an option to include the value of the entry, not just the key. You should also choose which type of events you want to receive. In the example below, a listener configuration for added and updated entries 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,
}
entryListenerConfig.NotifyEntryAdded(true)
entryListenerConfig.NotifyEntryUpdated(true)
m, err := client.GetMap(ctx, "somemap")

After creating the configuration, the second step is adding an event listener and a handler to act on received events: 

subscriptionID, err := m.AddEntryListener(ctx, entryListenerConfig, func(event *hazelcast.EntryNotified) {
	switch event.EventType {
	case hazelcast.EntryAdded:
		fmt.Println("Entry Added:", event.Value)
	case hazelcast.EntryRemoved:
		fmt.Println("Entry Removed:", event.Value)
	case hazelcast.EntryUpdated:
		fmt.Println("Entry Updated:", event.Value)
	case hazelcast.EntryEvicted:
		fmt.Println("Entry Evicted:", event.Value)
	case hazelcast.EntryLoaded:
		fmt.Println("Entry Loaded:", event.Value)
	}
})

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

err = m.RemoveEntryListener(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.

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.

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.Value)
	// this is an entry removed event
	case hazelcast.EntryRemoved:
		fmt.Println("Entry Removed:", event.Value)
	// this is an entry updated event
	case hazelcast.EntryUpdated:
		fmt.Println("Entry Updated:", event.Value)
	// this is an entry evicted event
	case hazelcast.EntryEvicted:
		fmt.Println("Entry Remove:", event.Value)
	// this is an entry loaded event
	case hazelcast.EntryLoaded:
		fmt.Println("Entry Loaded:", event.Value)
	}
})
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) 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) 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) 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) 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 interface{}, 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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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) 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 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) 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) 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 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) 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 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) 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) 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.
examples
cloud
cluster/failover
distributedobject/events
flake_id_generator
list
logger/custom_logger
map
map/context
map/execute_on_key
map/execute_predicate
map/lock
map/set_with_ttl
multimap
multimap/batch_operations
multimap/forceunlock
multimap/lock_trylock
portrange/default
portrange/specific
query
queue
replicated_map
security/credentials
serialization/custom
serialization/portable
set
sql/client-api/advanced_query_options
sql/client-api/employee
topic
Package hzerrors provides sentinel errors.
 Package hzerrors provides sentinel errors.
cb
check
client
cloud
cluster
event
hzerrors
invocation
it
it/runtime
lifecycle
logger
murmur
proto
proto/codec
* Copyright (c) 2008-2021, Hazelcast, Inc.
 * Copyright (c) 2008-2021, Hazelcast, Inc.
proxy
rest
security
serialization
soak_tests/map
sql
sql/driver
sql/types
stats
Package logger contains logging related API.
 Package logger contains logging related API.
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.
Package types contains various helper types.
 Package types contains various helper types.

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