eventbus

纯内存实现的发布订阅模式的事件总线，订阅逻辑仿照的nats

特点

1. 并发安全
2. 通过泛型提供有限的类型安全
3. 支持回调和channel两种订阅方式
4. 支持订阅者取消订阅

TODO

• 支持queue模式
• 支持通配匹配(支持*和>)
• 支持同步的Request模式

使用方法

安装

go get github.com/ganyyy/eventbus

使用

package main

import (
	"sync"
	"sync/atomic"

	"github.com/ganyyy/eventbus"
)

func main() {

	var bus = eventbus.NewMultiBus(4)

	const (
		Topic = "test.1"
		Num   = 100
	)

	var total1, total2 atomic.Int64
	var subCallback = eventbus.CallbackSubs(
		Topic,
		func(p eventbus.Msg[int]) {
			total1.Add(int64(p.Val()))
		},
	)

	var notifyChannel, subChan = eventbus.ChanSubs[int](
		Topic,
		Num,
	)
	var stopNotify = make(chan struct{})
	var stopReceive = make(chan struct{})

	go func() {
	end:
		for {
			// consume all
			select {
			case val := <-notifyChannel:
				total2.Add(int64(val.Val()))
			case <-stopReceive:
				select {
				case val := <-notifyChannel:
					total2.Add(int64(val.Val()))
					continue end
				default:
				}
				break end
			}
		}
		close(stopNotify)
	}()

	bus.Subscribe(subCallback)
	bus.Subscribe(subChan)

	defer bus.Unsubscribe(subChan)
	defer bus.Unsubscribe(subCallback)

	var wg sync.WaitGroup
	wg.Add(Num)

	for i := range Num {
		go func(i int) {
			bus.Publish(Topic, i)
			wg.Done()
		}(i)
	}

	wg.Wait()
	close(stopReceive)
	<-stopNotify

	println(total1.Load(), total2.Load())
}