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gaia/apps/clock/js/async_queue.js

@@ -0,0 +1,42 @@
+'use strict';
+define(function(require) {
+
+  /**
+   * A serial queue of functions. Call `.push()` to add a function to
+   * the task; when each function completes (as a result of calling
+   * 'done()'), the next item in the queue will be executed.
+   */
+  function AsyncQueue() {
+    this.queue = [];
+    this.current = null;
+  }
+
+  AsyncQueue.prototype = {
+    /**
+     * Add a function to the execution queue. It should accept one
+     * argument, a 'done' callback.
+     */
+    push: function(fn) {
+      if (!this.current) {
+        this._startTask(fn);
+      } else {
+        this.queue.push(fn);
+      }
+    },
+
+    _startTask: function(fn) {
+      this.current = fn;
+      fn(this._nextTask.bind(this));
+    },
+
+    _nextTask: function() {
+      this.current = null;
+      if (this.queue.length) {
+        this._startTask(this.queue.shift());
+      }
+    }
+  };
+
+  return AsyncQueue;
+});
+