Plato on Github
Report Home
node_modules/selenium-webdriver/lib/goog/async/run.js
Maintainability
74.80
Lines of code
136
Difficulty
36.91
Estimated Errors
0.76
Function weight
By Complexity
By SLOC
// Copyright 2013 The Closure Library Authors. All Rights Reserved. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS-IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. goog.provide('goog.async.run'); goog.require('goog.async.nextTick'); goog.require('goog.async.throwException'); goog.require('goog.testing.watchers'); /** * Fires the provided callback just before the current callstack unwinds, or as * soon as possible after the current JS execution context. * @param {function(this:THIS)} callback * @param {THIS=} opt_context Object to use as the "this value" when calling * the provided function. * @template THIS */ goog.async.run = function(callback, opt_context) { if (!goog.async.run.schedule_) { goog.async.run.initializeRunner_(); } if (!goog.async.run.workQueueScheduled_) { // Nothing is currently scheduled, schedule it now. goog.async.run.schedule_(); goog.async.run.workQueueScheduled_ = true; } goog.async.run.workQueue_.push( new goog.async.run.WorkItem_(callback, opt_context)); }; /** * Initializes the function to use to process the work queue. * @private */ goog.async.run.initializeRunner_ = function() { // If native Promises are available in the browser, just schedule the callback // on a fulfilled promise, which is specified to be async, but as fast as // possible. if (goog.global.Promise && goog.global.Promise.resolve) { var promise = goog.global.Promise.resolve(); goog.async.run.schedule_ = function() { promise.then(goog.async.run.processWorkQueue); }; } else { goog.async.run.schedule_ = function() { goog.async.nextTick(goog.async.run.processWorkQueue); }; } }; /** * Forces goog.async.run to use nextTick instead of Promise. * * This should only be done in unit tests. It's useful because MockClock * replaces nextTick, but not the browser Promise implementation, so it allows * Promise-based code to be tested with MockClock. */ goog.async.run.forceNextTick = function() { goog.async.run.schedule_ = function() { goog.async.nextTick(goog.async.run.processWorkQueue); }; }; /** * The function used to schedule work asynchronousely. * @private {function()} */ goog.async.run.schedule_; /** @private {boolean} */ goog.async.run.workQueueScheduled_ = false; /** @private {!Array.<!goog.async.run.WorkItem_>} */ goog.async.run.workQueue_ = []; if (goog.DEBUG) { /** * Reset the event queue. * @private */ goog.async.run.resetQueue_ = function() { goog.async.run.workQueueScheduled_ = false; goog.async.run.workQueue_ = []; }; // If there is a clock implemenation in use for testing // and it is reset, reset the queue. goog.testing.watchers.watchClockReset(goog.async.run.resetQueue_); } /** * Run any pending goog.async.run work items. This function is not intended * for general use, but for use by entry point handlers to run items ahead of * goog.async.nextTick. */ goog.async.run.processWorkQueue = function() { // NOTE: additional work queue items may be pushed while processing. while (goog.async.run.workQueue_.length) { // Don't let the work queue grow indefinitely. var workItems = goog.async.run.workQueue_; goog.async.run.workQueue_ = []; for (var i = 0; i < workItems.length; i++) { var workItem = workItems[i]; try { workItem.fn.call(workItem.scope); } catch (e) { goog.async.throwException(e); } } } // There are no more work items, reset the work queue. goog.async.run.workQueueScheduled_ = false; }; /** * @constructor * @final * @struct * @private * * @param {function()} fn * @param {Object|null|undefined} scope */ goog.async.run.WorkItem_ = function(fn, scope) { /** @const */ this.fn = fn; /** @const */ this.scope = scope; };