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async-pubsub

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async-pubsub

async pubsub

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async-pubsub

  • pubsub.js

这里是传统模式观察者模式 实现的只是一种模式,如果开发使用的是异步的操作

  • 会导致以下问题:

事件的发布Publish时,为了不阻断进程使用setTimeout重新开启了一个进程,在一定场景下提升了性能. 造成的问题:

使用观察者模式,开发者使用的肯定是同步式的写法,并没有开启异步回调。

所以当发布一个事件之后在短时间内取消了这个订阅。会导致在事件的发布过程中就被扼杀掉。

    pubsub.subscribe('sayName',function () {
        console.log('my name is caozheng');
    });
    
    pubsub.publish('sayName');
    pubsub.unTopic('sayName');
    
    // 理想的结果是输出: my name is caozheng
    // 再将sayName订阅的事件给杀掉
    
    // 然而因为publish的时候使用的是setTimeout异步处理

    // 结果没有输出的时候就被unTopic杀掉了
  • 处理方案: (将使用第二种方案)

1、 观察者模式不变,改变开发者写法。

开发者将使用async await、promise、co等异步转同步的写法。 从而解决publish的时候被unTopic/unSubscribe给杀掉

2、改变观察者模式转换成异步写法 async pubsub 观察者模式监听观察者模式直到publish事件之后,才能被杀掉。 开发者依然可以使用同步写法

  • 理想实现写法与之前相同 asyncPubsub.js

      asyncPubsub.subscribe('sayName',function () {
          console.log('my name is caozheng');
      });
      
      asyncPubsub.publish('sayName');
      asyncPubsub.unTopic('sayName');
      
      // 输出: my name is caozheng
    

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Package last updated on 20 Jan 2017

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