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<html>
<head>
<title>The source code</title>
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<pre class="prettyprint lang-js">/*!
* Ext JS Library 3.0.3
* Copyright(c) 2006-2009 Ext JS, LLC
* licensing@extjs.com
* http://www.extjs.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>
* 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 A config object that supports the following properties:<ul>
* <li><code>run</code> : Function<div class="sub-desc">The function to execute each time the task is run. The
* function will be called at each interval and passed the <code>args</code> argument if specified. If a
* particular scope is required, be sure to specify it using the <code>scope</code> argument.</div></li>
* <li><code>interval</code> : Number<div class="sub-desc">The frequency in milliseconds with which the task
* should be executed.</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>.</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 execute
* 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 execute the task before
* stopping automatically (defaults to indefinite).</div></li>
* </ul>
* @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>
* @singleton
*/
Ext.TaskMgr = new Ext.util.TaskRunner();</pre>
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