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- <title>The source code</title>
- <link href="../resources/prettify/prettify.css" type="text/css" rel="stylesheet" />
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- <pre class="prettyprint lang-js">/*!
- * Ext JS Library 3.3.1
- * Copyright(c) 2006-2010 Sencha Inc.
- * licensing@sencha.com
- * http://www.sencha.com/license
- */
-<div id="cls-Ext.util.TaskRunner"></div>/**
- * @class Ext.util.TaskRunner
- * Provides the ability to execute one or more arbitrary tasks in a multithreaded
- * manner. Generally, you can use the singleton {@link Ext.TaskMgr} instead, but
- * if needed, you can create separate instances of TaskRunner. Any number of
- * separate tasks can be started at any time and will run independently of each
- * other. Example usage:
- * <pre><code>
-// Start a simple clock task that updates a div once per second
-var updateClock = function(){
- Ext.fly('clock').update(new Date().format('g:i:s A'));
-}
-var task = {
- run: updateClock,
- interval: 1000 //1 second
-}
-var runner = new Ext.util.TaskRunner();
-runner.start(task);
-
-// equivalent using TaskMgr
-Ext.TaskMgr.start({
- run: updateClock,
- interval: 1000
-});
-
- * </code></pre>
- * <p>See the {@link #start} method for details about how to configure a task object.</p>
- * Also see {@link Ext.util.DelayedTask}.
- *
- * @constructor
- * @param {Number} interval (optional) The minimum precision in milliseconds supported by this TaskRunner instance
- * (defaults to 10)
- */
-Ext.util.TaskRunner = function(interval){
- interval = interval || 10;
- var tasks = [],
- removeQueue = [],
- id = 0,
- running = false,
-
- // private
- stopThread = function(){
- running = false;
- clearInterval(id);
- id = 0;
- },
-
- // private
- startThread = function(){
- if(!running){
- running = true;
- id = setInterval(runTasks, interval);
- }
- },
-
- // private
- removeTask = function(t){
- removeQueue.push(t);
- if(t.onStop){
- t.onStop.apply(t.scope || t);
- }
- },
-
- // private
- runTasks = function(){
- var rqLen = removeQueue.length,
- now = new Date().getTime();
-
- if(rqLen > 0){
- for(var i = 0; i < rqLen; i++){
- tasks.remove(removeQueue[i]);
- }
- removeQueue = [];
- if(tasks.length < 1){
- stopThread();
- return;
- }
- }
- for(var i = 0, t, itime, rt, len = tasks.length; i < len; ++i){
- t = tasks[i];
- itime = now - t.taskRunTime;
- if(t.interval <= itime){
- rt = t.run.apply(t.scope || t, t.args || [++t.taskRunCount]);
- t.taskRunTime = now;
- if(rt === false || t.taskRunCount === t.repeat){
- removeTask(t);
- return;
- }
- }
- if(t.duration && t.duration <= (now - t.taskStartTime)){
- removeTask(t);
- }
- }
- };
-
- <div id="method-Ext.util.TaskRunner-start"></div>/**
- * Starts a new task.
- * @method start
- * @param {Object} task <p>A config object that supports the following properties:<ul>
- * <li><code>run</code> : Function<div class="sub-desc"><p>The function to execute each time the task is invoked. The
- * function will be called at each interval and passed the <code>args</code> argument if specified, and the
- * current invocation count if not.</p>
- * <p>If a particular scope (<code>this</code> reference) is required, be sure to specify it using the <code>scope</code> argument.</p>
- * <p>Return <code>false</code> from this function to terminate the task.</p></div></li>
- * <li><code>interval</code> : Number<div class="sub-desc">The frequency in milliseconds with which the task
- * should be invoked.</div></li>
- * <li><code>args</code> : Array<div class="sub-desc">(optional) An array of arguments to be passed to the function
- * specified by <code>run</code>. If not specified, the current invocation count is passed.</div></li>
- * <li><code>scope</code> : Object<div class="sub-desc">(optional) The scope (<tt>this</tt> reference) in which to execute the
- * <code>run</code> function. Defaults to the task config object.</div></li>
- * <li><code>duration</code> : Number<div class="sub-desc">(optional) The length of time in milliseconds to invoke
- * the task before stopping automatically (defaults to indefinite).</div></li>
- * <li><code>repeat</code> : Number<div class="sub-desc">(optional) The number of times to invoke the task before
- * stopping automatically (defaults to indefinite).</div></li>
- * </ul></p>
- * <p>Before each invocation, Ext injects the property <code>taskRunCount</code> into the task object so
- * that calculations based on the repeat count can be performed.</p>
- * @return {Object} The task
- */
- this.start = function(task){
- tasks.push(task);
- task.taskStartTime = new Date().getTime();
- task.taskRunTime = 0;
- task.taskRunCount = 0;
- startThread();
- return task;
- };
-
- <div id="method-Ext.util.TaskRunner-stop"></div>/**
- * Stops an existing running task.
- * @method stop
- * @param {Object} task The task to stop
- * @return {Object} The task
- */
- this.stop = function(task){
- removeTask(task);
- return task;
- };
-
- <div id="method-Ext.util.TaskRunner-stopAll"></div>/**
- * Stops all tasks that are currently running.
- * @method stopAll
- */
- this.stopAll = function(){
- stopThread();
- for(var i = 0, len = tasks.length; i < len; i++){
- if(tasks[i].onStop){
- tasks[i].onStop();
- }
- }
- tasks = [];
- removeQueue = [];
- };
-};
-
-<div id="cls-Ext.TaskMgr"></div>/**
- * @class Ext.TaskMgr
- * @extends Ext.util.TaskRunner
- * A static {@link Ext.util.TaskRunner} instance that can be used to start and stop arbitrary tasks. See
- * {@link Ext.util.TaskRunner} for supported methods and task config properties.
- * <pre><code>
-// Start a simple clock task that updates a div once per second
-var task = {
- run: function(){
- Ext.fly('clock').update(new Date().format('g:i:s A'));
- },
- interval: 1000 //1 second
-}
-Ext.TaskMgr.start(task);
-</code></pre>
- * <p>See the {@link #start} method for details about how to configure a task object.</p>
- * @singleton
- */
-Ext.TaskMgr = new Ext.util.TaskRunner();</pre>
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