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This avoids redundant\n+ * queries and improves user perceived performance.\n+ *\n+ * @module call/task_sheduler\n+ */\n+define(function() {\n+  'use strict';\n+\n+  var Module = require('modules/base/module');\n+  var Observable = require('modules/mvvm/observable');\n+  \n+  /**\n+   * @class TaskScheduler\n+   * @returns {TaskScheduler}\n+   */\n+  var TaskScheduler = Module.create(function() {\n+    this.super(Observable).call(this);\n+    this.isLocked = false;\n+    this._tasks = [];\n+  }).extend(Observable);\n+\n+  Observable.defineObservableProperty(TaskScheduler.prototype, 'isLocked', {\n+    value: false\n+  });\n+\n+  /**\n+   * Change the internal state to make sure we are locked.\n+   *\n+   * @access private\n+   * @memberOf TaskScheduler\n+   */\n+  TaskScheduler.prototype._lock = function() {\n+    this.isLocked = true;\n+  };\n+\n+  /**\n+   * Change the internal state to unlocked and execute next task.\n+   *\n+   * @access private\n+   * @memberOf TaskScheduler\n+   */\n+  TaskScheduler.prototype._unlock = function() {\n+    this.isLocked = false;\n+    this._executeNextTask();\n+  };\n+\n+  /**\n+   * We will filter out redundant tasks and execute only the remaining ones.\n+   *\n+   * @access private\n+   * @memberOf TaskScheduler\n+   * @param {String} type\n+   */\n+  TaskScheduler.prototype._removeRedundantTasks = function(type) {\n+    return this._tasks.filter((task) => {\n+      return task.type !== type;\n+    });\n+  };\n+\n+  /**\n+   * Execute the next task when unlocked.\n+   *\n+   * @access private\n+   * @memberOf TaskScheduler\n+   */\n+  TaskScheduler.prototype._executeNextTask = function() {\n+    if (this.isLocked) {\n+      return;\n+    }\n+    var nextTask = this._tasks.shift();\n+    if (nextTask) {\n+      this._lock();\n+      nextTask.func(() => {\n+        this._unlock();\n+      });\n+    }\n+  };\n+\n+  /**\n+   * This is the only entry point for caller, and we will enqueue all tasks\n+   * one by one and execute them in order.\n+   *\n+   * @access public\n+   * @memberOf TaskScheduler\n+   * @param {String} type\n+   * @param {Function} func\n+   */\n+  TaskScheduler.prototype.enqueue = function(type, func) {","path":"apps/settings/js/modules/task_scheduler.js","position":91,"original_position":91,"commit_id":"2fa6d8df8d5059a5e31f9603c71a47b33417d9b7","original_commit_id":"2fa6d8df8d5059a5e31f9603c71a47b33417d9b7","user":{"login":"crh0716","id":2899280,"avatar_url":"https://avatars.githubusercontent.com/u/2899280?v=3","gravatar_id":"","url":"https://api.github.com/users/crh0716","html_url":"https://github.com/crh0716","followers_url":"https://api.github.com/users/crh0716/followers","following_url":"https://api.github.com/users/crh0716/following{/other_user}","gists_url":"https://api.github.com/users/crh0716/gists{/gist_id}","starred_url":"https://api.github.com/users/crh0716/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/crh0716/subscriptions","organizations_url":"https://api.github.com/users/crh0716/orgs","repos_url":"https://api.github.com/users/crh0716/repos","events_url":"https://api.github.com/users/crh0716/events{/privacy}","received_events_url":"https://api.github.com/users/crh0716/received_events","type":"User","site_admin":false},"body":"It would look like the following:\r\n```\r\ntaskScheduler.enqueue('xxx_type', function task() {}).then((result) => {});\r\n```","created_at":"2015-04-16T07:36:19Z","updated_at":"2015-04-16T07:36:19Z","html_url":"https://github.com/mozilla-b2g/gaia/pull/28974#discussion_r28489227","pull_request_url":"https://api.github.com/repos/mozilla-b2g/gaia/pulls/28974","_links":{"self":{"href":"https://api.github.com/repos/mozilla-b2g/gaia/pulls/comments/28489227"},"html":{"href":"https://github.com/mozilla-b2g/gaia/pull/28974#discussion_r28489227"},"pull_request":{"href":"https://api.github.com/repos/mozilla-b2g/gaia/pulls/28974"}}},"pull_request":{"url":"https://api.github.com/repos/mozilla-b2g/gaia/pulls/28974","id":31505823,"html_url":"https://github.com/mozilla-b2g/gaia/pull/28974","diff_url":"https://github.com/mozilla-b2g/gaia/pull/28974.diff","patch_url":"https://github.com/mozilla-b2g/gaia/pull/28974.patch","issue_url":"https://api.github.com/repos/mozilla-b2g/gaia/issues/28974","number":28974,"state":"open","locked":false,"title":"Bug 1145055 - 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