如何命名这个模式？类似的存在吗？触发回调队列

Question

我需要你的帮助来命名或识别这样的现有模式。对于我正在开发的应用程序，我需要创建一个由事件触发的回调队列。一旦事件被触发，添加到队列中的连续回调将立即被触发。

在代码中它会是这样的：

var queue = new TriggeredCallbackQueue();

queue.onTriggerOrNow(() => console.log('Callback 1')); 
// Nothing is logged to the console

queue.onTriggerOrNow(() => console.log('Callback 2'));
// Nothing is logged to the console

queue.trigger();    // 'Callback1' and 'Callback 2' are logged to console

queue.onTriggerOrNow(() => console.log('Callback 3'));  
// 'Callback 3' is logged to the console

queue.onTriggerOrNow(() => console.log('Callback 4'));  
// 'Callback 4' is logged to the console

你知道这样的模式是否已经存在并且在任何地方都被分类了吗？你会怎么命名它？你觉得 TriggeredCallbackQueue 名字怎么样？

Answer 1

我认为是 Promise 设计模式，稍作改动 API:

class TriggeredCallbackQueue {
  constructor() {
    this.promise = new Promise((res, rej) => {
      this._res = res;
      this._rej = rej;
    });
  }

  trigger() {
    this._res();
  }

  onTriggerOrNow(cb) {
    this.promise = this.promise.then(cb);
  }
}

var queue = new TriggeredCallbackQueue();

queue.onTriggerOrNow(() => console.log('Callback 1'));
// Nothing is logged to the console

queue.onTriggerOrNow(() => console.log('Callback 2'));
// Nothing is logged to the console

setTimeout(() => {
  queue.trigger(); // 'Callback1' and 'Callback 2' are logged to console
}, 2000);

setTimeout(() => {
  queue.onTriggerOrNow(() => console.log('Callback 3'));
  // 'Callback 3' is logged to the console

  queue.onTriggerOrNow(() => console.log('Callback 4'));
  // 'Callback 4' is logged to the console
}, 4000);

setTimeout(() => {
  queue.trigger(); // Nothing happens
}, 5000);

如何命名这个模式？类似的存在吗？触发回调队列

How to name this pattern? Does similar exist? Queue of triggered callback

queue

design-patterns

callback

eventtrigger