Go语言中的观察者模式 [英] Observer pattern in Go language

问题描述

这个问题很常见：​​当一个事件发生时，一个对象应该通知所有的订阅者。在C ++中，我们可以使用 boost :: signals 或其他东西。但是如何在Go语言中做到这一点？很高兴看到一些工作代码示例，其中几个对象订阅了发布者和处理通知。

This problem is pretty common: an object should notify all its subscribers when some event occurs. In C++ we may use boost::signals or something else. But how to do this in Go language? It would be nice to see some working code example where a couple of objects are subscribed to a publisher and process notifications.

感谢

推荐答案

这在Go中实际上很简单。使用频道。

This is actually pretty simple in Go. Use channels. This is the kind of thing they're made for.

type Publish struct {
    listeners []chan *Msg
}

type Subscriber struct {
    Channel chan *Msg
}

func (p *Publisher) Sub(c chan *Msg) {
    p.appendListener(c)
}

func (p *Publisher) Pub(m *Msg) {
    for _, c := range p.listeners {
        c <- Msg
    }
}

func (s *Subscriber) ListenOnChannel() {
    for {
        data := <-s.Channel
        //Process data
    }
}

func main() {
    for _, v := range subscribers {
        p.Sub(v.Channel)
        go v.ListenOnChannel()
    }
    //Some kind of wait here
}

显然，这不是一个工作代码示例。但它很接近。

Obviously this isn't exactly a working code sample. But it's close.

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