X-Git-Url: http://git.ithinksw.org/extjs.git/blobdiff_plain/2e847cf21b8ab9d15fa167b315ca5b2fa92638fc..6a7e4474cba9d8be4b2ec445e10f1691f7277c50:/src/util/core/TaskMgr.js

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-/*!
- * Ext JS Library 3.1.1
- * Copyright(c) 2006-2010 Ext JS, LLC
- * licensing@extjs.com
- * http://www.extjs.com/license
- */
-/**
- * @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);
-	            }
-	        }
-	    };
-
-    /**
-     * 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;
-    };
-
-    /**
-     * 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;
-    };
-
-    /**
-     * 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 = [];
-    };
-};
-
-/**
- * @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();
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