pauseable 庫

pauseable.js

https://www.npmjs.com/package/pauseable

Pauseable allows you to pause event emitters, timeouts, and intervals. It can group multiple of these pauseable objects and pause entire groups.

 

Using pauseable with EventEmitter

const pauseable = require('pauseable');

const EventEmitter = require('events').EventEmitter;

 

var ee = new EventEmitter();

 

ee.on('foo', () => { ... });

 

// ...later

pauseable.pause(ee);

 

// this event will not be immediately fired

// instead, it will be buffered

ee.emit('foo', 'hellow');

 

// ...much later

// the 'foo' event will be fired at this point

pauseable.resume(ee);

 

Comes with pauseable setTimeout and setInterval too

var timeout = pauseable.setTimeout(() => {

  // this will take 8 seconds total to execute

  // not 5

}, 5000);

 

// pause timeout after 2 secs

setTimeout(() => {

  timeout.pause();

  timeout.isPaused(); // true

  

  // resume after 3

  setTimeout(() => {

    timeout.resume();

  }, 3000);

}, 2000);

The function and ms arguments are interchangeable. Use whichever way you prefer!

var interval = pauseable.setInterval(5000, () => {

  // this is called after 5 seconds

  // then paused for 2 seconds

  interval.pause(2000);

});

 

 

Motive

Javascript is event based by nature. When developing large scale applications that are completely event based, it becomes complicated to pause the streaming of events, because Javascript never "sleeps". It becomes even more complicated to pause timeouts and intervals, having to keep track of when they were paused so they can be resumed with the correct time again.

That's where this module comes in. Pauseable helps manage pausing and resuming your application or part of it. It works with EventEmitter, with setInterval and setTimeout.

 

 用途：

一、 頁面遊戲， 例如花朵和殭屍， 可使用魔法將殭屍定住一段時間， 時間到後殭屍繼續行動。

二、 XX功能關閉， 對於XX功能是由事件監聽驅動的， 可使用這個功能臨時關閉掉， 須要的時候再打開。