src/cm/media/js/lib/yui/yui3.0.0/api/io-queue.js.html
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    23                  &gt; io-queue.js (source view) 
       
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    50                         <div class="highlight" ><pre>   <span class="c">/**</span>
       
    51 <span class="c">    * Extends the IO base class to implement Queue for synchronous</span>
       
    52 <span class="c">    * transaction processing.</span>
       
    53 <span class="c">	* @module io</span>
       
    54 <span class="c">	* @submodule io-queue</span>
       
    55 <span class="c">	*/</span>
       
    56 
       
    57    <span class="c">/**</span>
       
    58 <span class="c">	* @description Array of transactions queued for processing</span>
       
    59 <span class="c">	*</span>
       
    60 <span class="c">	* @property _yQ</span>
       
    61 <span class="c">	* @private</span>
       
    62 <span class="c">	* @static</span>
       
    63 <span class="c">	* @type Object</span>
       
    64 <span class="c">	*/</span>
       
    65 	<span class="k">var</span> <span class="nx">_q</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">Queue</span><span class="o">(),</span>
       
    66 
       
    67    <span class="c">/**</span>
       
    68 <span class="c">	* @description Reference to &quot;io:complete&quot; event handler.</span>
       
    69 <span class="c">	*</span>
       
    70 <span class="c">	* @property _e</span>
       
    71 <span class="c">	* @private</span>
       
    72 <span class="c">	* @static</span>
       
    73 <span class="c">	* @type Object</span>
       
    74 <span class="c">	*/</span>
       
    75 	<span class="nx">_e</span><span class="o">,</span>
       
    76 
       
    77 	<span class="nx">_activeId</span><span class="o">,</span>
       
    78    <span class="c">/**</span>
       
    79 <span class="c">	* @description Property to determine whether the queue is set to</span>
       
    80 <span class="c">	* 1 (active) or 0 (inactive).  When inactive, transactions</span>
       
    81 <span class="c">	* will be stored in the queue until the queue is set to active.</span>
       
    82 <span class="c">	*</span>
       
    83 <span class="c">	* @property _qState</span>
       
    84 <span class="c">	* @private</span>
       
    85 <span class="c">	* @static</span>
       
    86 <span class="c">	* @type int</span>
       
    87 <span class="c">	*/</span>
       
    88 	<span class="nx">_qState</span> <span class="o">=</span> <span class="m">1</span><span class="o">;</span>
       
    89 
       
    90    <span class="c">/**</span>
       
    91 <span class="c">	* @description Method for requesting a transaction, and queueing the</span>
       
    92 <span class="c">	* request before it is sent to the resource.</span>
       
    93 <span class="c">	*</span>
       
    94 <span class="c">	* @method _queue</span>
       
    95 <span class="c">	* @private</span>
       
    96 <span class="c">	* @static</span>
       
    97 <span class="c">	* @return Object</span>
       
    98 <span class="c">	*/</span>
       
    99 	<span class="k">function</span> <span class="nx">_queue</span><span class="o">(</span><span class="nx">uri</span><span class="o">,</span> <span class="nx">c</span><span class="o">)</span> <span class="o">{</span>
       
   100 		<span class="k">var</span> <span class="nx">o</span> <span class="o">=</span> <span class="o">{</span> <span class="nx">uri</span><span class="o">:</span> <span class="nx">uri</span><span class="o">,</span> <span class="nx">id</span><span class="o">:</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">io</span><span class="o">.</span><span class="nx">_id</span><span class="o">(),</span> <span class="nx">cfg</span><span class="o">:</span><span class="nx">c</span> <span class="o">};</span>
       
   101 
       
   102 		<span class="nx">_q</span><span class="o">.</span><span class="nx">add</span><span class="o">(</span><span class="nx">o</span><span class="o">);</span>
       
   103 		<span class="k">if</span> <span class="o">(</span><span class="nx">_qState</span> <span class="o">===</span> <span class="m">1</span><span class="o">)</span> <span class="o">{</span>
       
   104 			<span class="nx">_shift</span><span class="o">();</span>
       
   105 		<span class="o">}</span>
       
   106 
       
   107 		<span class="nx">Y</span><span class="o">.</span><span class="nx">log</span><span class="o">(</span><span class="s1">&#39;Object queued.  Transaction id is&#39;</span> <span class="o">+</span> <span class="nx">o</span><span class="o">.</span><span class="nx">id</span><span class="o">,</span> <span class="s1">&#39;info&#39;</span><span class="o">,</span> <span class="s1">&#39;io&#39;</span><span class="o">);</span>
       
   108 		<span class="k">return</span> <span class="nx">o</span><span class="o">;</span>
       
   109 	<span class="o">}</span>
       
   110 
       
   111    <span class="c">/**</span>
       
   112 <span class="c">	* @description Method Process the first transaction from the</span>
       
   113 <span class="c">	* queue in FIFO order.</span>
       
   114 <span class="c">	*</span>
       
   115 <span class="c">	* @method _shift</span>
       
   116 <span class="c">	* @private</span>
       
   117 <span class="c">	* @static</span>
       
   118 <span class="c">	* @return void</span>
       
   119 <span class="c">	*/</span>
       
   120 	<span class="k">function</span> <span class="nx">_shift</span><span class="o">()</span> <span class="o">{</span>
       
   121 		<span class="k">var</span> <span class="nx">o</span> <span class="o">=</span> <span class="nx">_q</span><span class="o">.</span><span class="nx">next</span><span class="o">();</span>
       
   122 
       
   123 		<span class="nx">_activeId</span> <span class="o">=</span> <span class="nx">o</span><span class="o">.</span><span class="nx">id</span><span class="o">;</span>
       
   124 		<span class="nx">_qState</span> <span class="o">=</span> <span class="m">0</span><span class="o">;</span>
       
   125 		<span class="nx">Y</span><span class="o">.</span><span class="nx">io</span><span class="o">(</span><span class="nx">o</span><span class="o">.</span><span class="nx">uri</span><span class="o">,</span> <span class="nx">o</span><span class="o">.</span><span class="nx">cfg</span><span class="o">,</span> <span class="nx">o</span><span class="o">.</span><span class="nx">id</span><span class="o">);</span>
       
   126 	<span class="o">}</span>
       
   127 
       
   128    <span class="c">/**</span>
       
   129 <span class="c">	* @description Method for promoting a transaction to the top of the queue.</span>
       
   130 <span class="c">	*</span>
       
   131 <span class="c">	* @method _unshift</span>
       
   132 <span class="c">	* @private</span>
       
   133 <span class="c">	* @static</span>
       
   134 <span class="c">	* @return void</span>
       
   135 <span class="c">	*/</span>
       
   136 	<span class="k">function</span> <span class="nx">_unshift</span><span class="o">(</span><span class="nx">o</span><span class="o">)</span> <span class="o">{</span>
       
   137 		<span class="nx">_q</span><span class="o">.</span><span class="nx">promote</span><span class="o">(</span><span class="nx">o</span><span class="o">);</span>
       
   138 	<span class="o">}</span>
       
   139 
       
   140 	<span class="k">function</span> <span class="nx">_next</span><span class="o">(</span><span class="nx">id</span><span class="o">)</span> <span class="o">{</span>
       
   141 		<span class="nx">_qState</span> <span class="o">=</span> <span class="m">1</span><span class="o">;</span>
       
   142 		<span class="k">if</span> <span class="o">(</span><span class="nx">_activeId</span> <span class="o">===</span> <span class="nx">id</span> <span class="o">&amp;&amp;</span> <span class="nx">_q</span><span class="o">.</span><span class="nx">size</span><span class="o">()</span> <span class="o">&gt;</span> <span class="m">0</span><span class="o">)</span> <span class="o">{</span>
       
   143 			<span class="nx">_shift</span><span class="o">();</span>
       
   144 		<span class="o">}</span>
       
   145 	<span class="o">}</span>
       
   146 
       
   147    <span class="c">/**</span>
       
   148 <span class="c">	* @description Method for removing a specific, pending transaction from</span>
       
   149 <span class="c">	* the queue.</span>
       
   150 <span class="c">	*</span>
       
   151 <span class="c">	* @method _remove</span>
       
   152 <span class="c">	* @private</span>
       
   153 <span class="c">	* @static</span>
       
   154 <span class="c">	* @return void</span>
       
   155 <span class="c">	*/</span>
       
   156 	<span class="k">function</span> <span class="nx">_remove</span><span class="o">(</span><span class="nx">o</span><span class="o">)</span> <span class="o">{</span>
       
   157 		<span class="nx">_q</span><span class="o">.</span><span class="nx">remove</span><span class="o">(</span><span class="nx">o</span><span class="o">);</span>
       
   158 	<span class="o">}</span>
       
   159 
       
   160 	<span class="k">function</span> <span class="nx">_start</span><span class="o">()</span> <span class="o">{</span>
       
   161 		<span class="nx">_qState</span> <span class="o">=</span> <span class="m">1</span><span class="o">;</span>
       
   162 
       
   163 		<span class="k">if</span> <span class="o">(</span><span class="nx">_q</span><span class="o">.</span><span class="nx">size</span><span class="o">()</span> <span class="o">&gt;</span> <span class="m">0</span><span class="o">)</span> <span class="o">{</span>
       
   164 			<span class="nx">_shift</span><span class="o">();</span>
       
   165 		<span class="o">}</span>
       
   166 		<span class="nx">Y</span><span class="o">.</span><span class="nx">log</span><span class="o">(</span><span class="s1">&#39;Queue started.&#39;</span><span class="o">,</span> <span class="s1">&#39;info&#39;</span><span class="o">,</span> <span class="s1">&#39;io&#39;</span><span class="o">);</span>
       
   167 	<span class="o">}</span>
       
   168 
       
   169    <span class="c">/**</span>
       
   170 <span class="c">	* @description Method for setting queue processing to inactive.</span>
       
   171 <span class="c">	* Transaction requests to YUI.io.queue() will be stored in the queue, but</span>
       
   172 <span class="c">	* not processed until the queue is reset to &quot;active&quot;.</span>
       
   173 <span class="c">	*</span>
       
   174 <span class="c">	* @method _stop</span>
       
   175 <span class="c">	* @private</span>
       
   176 <span class="c">	* @static</span>
       
   177 <span class="c">	* @return void</span>
       
   178 <span class="c">	*/</span>
       
   179 	<span class="k">function</span> <span class="nx">_stop</span><span class="o">()</span> <span class="o">{</span>
       
   180 		<span class="nx">_qState</span> <span class="o">=</span> <span class="m">0</span><span class="o">;</span>
       
   181 		<span class="nx">Y</span><span class="o">.</span><span class="nx">log</span><span class="o">(</span><span class="s1">&#39;Queue stopped.&#39;</span><span class="o">,</span> <span class="s1">&#39;info&#39;</span><span class="o">,</span> <span class="s1">&#39;io&#39;</span><span class="o">);</span>
       
   182 	<span class="o">};</span>
       
   183 
       
   184    <span class="c">/**</span>
       
   185 <span class="c">	* @description Method to query the current size of the queue.</span>
       
   186 <span class="c">	*</span>
       
   187 <span class="c">	* @method _size</span>
       
   188 <span class="c">	* @private</span>
       
   189 <span class="c">	* @static</span>
       
   190 <span class="c">	* @return int</span>
       
   191 <span class="c">	*/</span>
       
   192 	<span class="k">function</span> <span class="nx">_size</span><span class="o">()</span> <span class="o">{</span>
       
   193 		<span class="k">return</span> <span class="nx">_q</span><span class="o">.</span><span class="nx">size</span><span class="o">();</span>
       
   194 	<span class="o">};</span>
       
   195 
       
   196 	<span class="nx">_e</span> <span class="o">=</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">on</span><span class="o">(</span><span class="s1">&#39;io:complete&#39;</span><span class="o">,</span> <span class="k">function</span><span class="o">(</span><span class="nx">id</span><span class="o">)</span> <span class="o">{</span> <span class="nx">_next</span><span class="o">(</span><span class="nx">id</span><span class="o">);</span> <span class="o">},</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">io</span><span class="o">);</span>
       
   197 
       
   198    <span class="c">/**</span>
       
   199 <span class="c">	* @description Method to query the current size of the queue, or to</span>
       
   200 <span class="c">	* set a maximum queue size.  This is the interface for _size().</span>
       
   201 <span class="c">	*</span>
       
   202 <span class="c">	* @method size</span>
       
   203 <span class="c">	* @public</span>
       
   204 <span class="c">	* @static</span>
       
   205 <span class="c">	* @param {number} i - Specified maximum size of queue.</span>
       
   206 <span class="c">    * @return number</span>
       
   207 <span class="c">	*/</span>
       
   208 	<span class="nx">_queue</span><span class="o">.</span><span class="nx">size</span> <span class="o">=</span> <span class="nx">_size</span><span class="o">;</span>
       
   209 
       
   210    <span class="c">/**</span>
       
   211 <span class="c">	* @description Method for setting the queue to active. If there are</span>
       
   212 <span class="c">	* transactions pending in the queue, they will be processed from the</span>
       
   213 <span class="c">	* queue in FIFO order. This is the interface for _start().</span>
       
   214 <span class="c">	*</span>
       
   215 <span class="c">	* @method start</span>
       
   216 <span class="c">	* @public</span>
       
   217 <span class="c">	* @static</span>
       
   218 <span class="c">    * @return void</span>
       
   219 <span class="c">	*/</span>
       
   220 	<span class="nx">_queue</span><span class="o">.</span><span class="nx">start</span> <span class="o">=</span> <span class="nx">_start</span><span class="o">;</span>
       
   221 
       
   222    <span class="c">/**</span>
       
   223 <span class="c">	* @description Method for setting queue processing to inactive.</span>
       
   224 <span class="c">	* Transaction requests to YUI.io.queue() will be stored in the queue, but</span>
       
   225 <span class="c">	* not processed until the queue is restarted. This is the</span>
       
   226 <span class="c">	* interface for _stop().</span>
       
   227 <span class="c">	*</span>
       
   228 <span class="c">	* @method stop</span>
       
   229 <span class="c">	* @public</span>
       
   230 <span class="c">	* @static</span>
       
   231 <span class="c">    * @return void</span>
       
   232 <span class="c">	*/</span>
       
   233 	<span class="nx">_queue</span><span class="o">.</span><span class="nx">stop</span> <span class="o">=</span> <span class="nx">_stop</span><span class="o">;</span>
       
   234 
       
   235    <span class="c">/**</span>
       
   236 <span class="c">	* @description Method for promoting a transaction to the top of the queue.</span>
       
   237 <span class="c">	* This is the interface for _unshift().</span>
       
   238 <span class="c">	*</span>
       
   239 <span class="c">	* @method promote</span>
       
   240 <span class="c">	* @public</span>
       
   241 <span class="c">	* @static</span>
       
   242 <span class="c">	* @param {Object} o - Reference to queued transaction.</span>
       
   243 <span class="c">    * @return void</span>
       
   244 <span class="c">	*/</span>
       
   245 	<span class="nx">_queue</span><span class="o">.</span><span class="nx">promote</span> <span class="o">=</span> <span class="nx">_unshift</span><span class="o">;</span>
       
   246 
       
   247    <span class="c">/**</span>
       
   248 <span class="c">	* @description Method for removing a specific, pending transaction from</span>
       
   249 <span class="c">	* the queue. This is the interface for _remove().</span>
       
   250 <span class="c">	*</span>
       
   251 <span class="c">	* @method remove</span>
       
   252 <span class="c">	* @public</span>
       
   253 <span class="c">	* @static</span>
       
   254 <span class="c">	* @param {Object} o - Reference to queued transaction.</span>
       
   255 <span class="c">    * @return void</span>
       
   256 <span class="c">	*/</span>
       
   257 	<span class="nx">_queue</span><span class="o">.</span><span class="nx">remove</span> <span class="o">=</span> <span class="nx">_remove</span><span class="o">;</span>
       
   258 
       
   259     <span class="nx">Y</span><span class="o">.</span><span class="nx">mix</span><span class="o">(</span><span class="nx">Y</span><span class="o">.</span><span class="nx">io</span><span class="o">,</span> <span class="o">{</span>
       
   260 		<span class="nx">queue</span><span class="o">:</span> <span class="nx">_queue</span>
       
   261     <span class="o">},</span> <span class="kc">true</span><span class="o">);</span>
       
   262 </pre></div>
       
   263 
       
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   291                                 <li class=""><a href="module_event-simulate.html" title="event-simulate">event-simulate</a></li>
       
   292                                 <li class=""><a href="module_history.html" title="history">history</a></li>
       
   293                                 <li class=""><a href="module_imageloader.html" title="imageloader">imageloader</a></li>
       
   294                                 <li class="selected"><a href="module_io.html" title="io">io</a></li>
       
   295                                 <li class=""><a href="module_json.html" title="json">json</a></li>
       
   296                                 <li class=""><a href="module_node.html" title="node">node</a></li>
       
   297                                 <li class=""><a href="module_node-focusmanager.html" title="node-focusmanager">node-focusmanager</a></li>
       
   298                                 <li class=""><a href="module_node-menunav.html" title="node-menunav">node-menunav</a></li>
       
   299                                 <li class=""><a href="module_oop.html" title="oop">oop</a></li>
       
   300                                 <li class=""><a href="module_overlay.html" title="overlay">overlay</a></li>
       
   301                                 <li class=""><a href="module_plugin.html" title="plugin">plugin</a></li>
       
   302                                 <li class=""><a href="module_profiler.html" title="profiler">profiler</a></li>
       
   303                                 <li class=""><a href="module_queue-promote.html" title="queue-promote">queue-promote</a></li>
       
   304                                 <li class=""><a href="module_slider.html" title="slider">slider</a></li>
       
   305                                 <li class=""><a href="module_stylesheet.html" title="stylesheet">stylesheet</a></li>
       
   306                                 <li class=""><a href="module_substitute.html" title="substitute">substitute</a></li>
       
   307                                 <li class=""><a href="module_test.html" title="test">test</a></li>
       
   308                                 <li class=""><a href="module_widget.html" title="widget">widget</a></li>
       
   309                                 <li class=""><a href="module_widget-position.html" title="widget-position">widget-position</a></li>
       
   310                                 <li class=""><a href="module_widget-position-ext.html" title="widget-position-ext">widget-position-ext</a></li>
       
   311                                 <li class=""><a href="module_widget-stack.html" title="widget-stack">widget-stack</a></li>
       
   312                                 <li class=""><a href="module_widget-stdmod.html" title="widget-stdmod">widget-stdmod</a></li>
       
   313                                 <li class=""><a href="module_yui.html" title="yui">yui</a></li>
       
   314                         </ul>
       
   315                     </div>
       
   316 
       
   317                     <div id="classList" class="module">
       
   318                         <h4>Classes</h4>
       
   319                         <ul class="content">
       
   320                                 <li class=""><a href="io.html" title="io">io</a></li>
       
   321                         </ul>
       
   322                     </div>
       
   323 
       
   324                     <div id="fileList" class="module">
       
   325                         <h4>Files</h4>
       
   326                         <ul class="content">        
       
   327                                 <li class=""><a href="io-base.js.html" title="io-base.js">io-base.js</a></li>
       
   328                                 <li class=""><a href="io-form.js.html" title="io-form.js">io-form.js</a></li>
       
   329                                 <li class="selected"><a href="io-queue.js.html" title="io-queue.js">io-queue.js</a></li>
       
   330                                 <li class=""><a href="io-upload-iframe.js.html" title="io-upload-iframe.js">io-upload-iframe.js</a></li>
       
   331                                 <li class=""><a href="io-xdr.js.html" title="io-xdr.js">io-xdr.js</a></li>
       
   332                         </ul>
       
   333                     </div>
       
   334 
       
   335 
       
   336 
       
   337 
       
   338 
       
   339             </div>
       
   340 		</div>
       
   341 	</div>
       
   342 	<div id="ft">
       
   343         <hr />
       
   344         Copyright &copy; 2009 Yahoo! Inc. All rights reserved.
       
   345 	</div>
       
   346 </div>
       
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