orderedthreadpoolexecutor.html

MINA+API 关于MINA的API

<a name="429" href="#429">429</a>         <strong class="jxr_keyword">if</strong> (corePoolSize &lt; 0) {
<a name="430" href="#430">430</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"corePoolSize: "</span> + corePoolSize);
<a name="431" href="#431">431</a>         }
<a name="432" href="#432">432</a>         <strong class="jxr_keyword">if</strong> (corePoolSize &gt; maximumPoolSize) {
<a name="433" href="#433">433</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"corePoolSize exceeds maximumPoolSize"</span>);
<a name="434" href="#434">434</a>         }
<a name="435" href="#435">435</a>         
<a name="436" href="#436">436</a>         <strong class="jxr_keyword">synchronized</strong> (workers) {
<a name="437" href="#437">437</a>             <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.corePoolSize &gt; corePoolSize) {
<a name="438" href="#438">438</a>                 <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = <strong class="jxr_keyword">this</strong>.corePoolSize - corePoolSize; i &gt; 0; i --) {
<a name="439" href="#439">439</a>                     removeWorker();
<a name="440" href="#440">440</a>                 }
<a name="441" href="#441">441</a>             }
<a name="442" href="#442">442</a>             <strong class="jxr_keyword">this</strong>.corePoolSize = corePoolSize;
<a name="443" href="#443">443</a>         }
<a name="444" href="#444">444</a>     }
<a name="445" href="#445">445</a> 
<a name="446" href="#446">446</a>     <strong class="jxr_keyword">private</strong> <a href="../../../../../org/apache/mina/filter/executor/OrderedThreadPoolExecutor.html">SessionBuffer</a> getSessionBuffer(<a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session) {
<a name="447" href="#447">447</a>         <a href="../../../../../org/apache/mina/filter/executor/OrderedThreadPoolExecutor.html">SessionBuffer</a> buffer = (SessionBuffer) session.getAttribute(BUFFER);
<a name="448" href="#448">448</a>         <strong class="jxr_keyword">if</strong> (buffer == <strong class="jxr_keyword">null</strong>) {
<a name="449" href="#449">449</a>             buffer = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/mina/filter/executor/OrderedThreadPoolExecutor.html">SessionBuffer</a>();
<a name="450" href="#450">450</a>             <a href="../../../../../org/apache/mina/filter/executor/OrderedThreadPoolExecutor.html">SessionBuffer</a> oldBuffer = (SessionBuffer) session.setAttributeIfAbsent(BUFFER, buffer);
<a name="451" href="#451">451</a>             <strong class="jxr_keyword">if</strong> (oldBuffer != <strong class="jxr_keyword">null</strong>) {
<a name="452" href="#452">452</a>                 buffer = oldBuffer;
<a name="453" href="#453">453</a>             }
<a name="454" href="#454">454</a>         }
<a name="455" href="#455">455</a>         <strong class="jxr_keyword">return</strong> buffer;
<a name="456" href="#456">456</a>     }
<a name="457" href="#457">457</a>     
<a name="458" href="#458">458</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/mina/filter/executor/OrderedThreadPoolExecutor.html">SessionBuffer</a> {
<a name="459" href="#459">459</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> Queue&lt;Runnable&gt; queue = <strong class="jxr_keyword">new</strong> CircularQueue&lt;Runnable&gt;();
<a name="460" href="#460">460</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> processingCompleted = <strong class="jxr_keyword">true</strong>;
<a name="461" href="#461">461</a>     }
<a name="462" href="#462">462</a>     
<a name="463" href="#463">463</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/mina/common/AbstractPollingConnectionlessIoAcceptor.html">Worker</a> implements Runnable {
<a name="464" href="#464">464</a>         
<a name="465" href="#465">465</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">volatile</strong> <strong class="jxr_keyword">long</strong> completedTaskCount;
<a name="466" href="#466">466</a>         <strong class="jxr_keyword">private</strong> Thread thread;
<a name="467" href="#467">467</a>         
<a name="468" href="#468">468</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> run() {
<a name="469" href="#469">469</a>             thread = Thread.currentThread();
<a name="470" href="#470">470</a> 
<a name="471" href="#471">471</a>             <strong class="jxr_keyword">try</strong> {
<a name="472" href="#472">472</a>                 <strong class="jxr_keyword">for</strong> (;;) {
<a name="473" href="#473">473</a>                     <a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session = fetchSession();
<a name="474" href="#474">474</a>                     
<a name="475" href="#475">475</a>                     idleWorkers.decrementAndGet();
<a name="476" href="#476">476</a>                     
<a name="477" href="#477">477</a>                     <strong class="jxr_keyword">if</strong> (session == <strong class="jxr_keyword">null</strong>) {
<a name="478" href="#478">478</a>                         <strong class="jxr_keyword">synchronized</strong> (workers) {
<a name="479" href="#479">479</a>                             <strong class="jxr_keyword">if</strong> (workers.size() &gt; corePoolSize) {
<a name="480" href="#480">480</a>                                 <em class="jxr_comment">// Remove now to prevent duplicate exit.</em>
<a name="481" href="#481">481</a>                                 workers.remove(<strong class="jxr_keyword">this</strong>);
<a name="482" href="#482">482</a>                                 <strong class="jxr_keyword">break</strong>;
<a name="483" href="#483">483</a>                             }
<a name="484" href="#484">484</a>                         }
<a name="485" href="#485">485</a>                     }
<a name="486" href="#486">486</a>                     
<a name="487" href="#487">487</a>                     <strong class="jxr_keyword">if</strong> (session == EXIT_SIGNAL) {
<a name="488" href="#488">488</a>                         <strong class="jxr_keyword">break</strong>;
<a name="489" href="#489">489</a>                     }
<a name="490" href="#490">490</a>                     
<a name="491" href="#491">491</a>                     <strong class="jxr_keyword">try</strong> {
<a name="492" href="#492">492</a>                         runTasks(getSessionBuffer(session));
<a name="493" href="#493">493</a>                     } <strong class="jxr_keyword">finally</strong> {
<a name="494" href="#494">494</a>                         idleWorkers.incrementAndGet();
<a name="495" href="#495">495</a>                     }
<a name="496" href="#496">496</a>                 }
<a name="497" href="#497">497</a>             } <strong class="jxr_keyword">finally</strong> {
<a name="498" href="#498">498</a>                 <strong class="jxr_keyword">synchronized</strong> (workers) {
<a name="499" href="#499">499</a>                     workers.remove(<strong class="jxr_keyword">this</strong>);
<a name="500" href="#500">500</a>                     OrderedThreadPoolExecutor.<strong class="jxr_keyword">this</strong>.completedTaskCount += completedTaskCount;
<a name="501" href="#501">501</a>                     workers.notifyAll();
<a name="502" href="#502">502</a>                 }
<a name="503" href="#503">503</a>             }
<a name="504" href="#504">504</a>         }
<a name="505" href="#505">505</a> 
<a name="506" href="#506">506</a>         <strong class="jxr_keyword">private</strong> <a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> fetchSession() {
<a name="507" href="#507">507</a>             <a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session = <strong class="jxr_keyword">null</strong>;
<a name="508" href="#508">508</a>             <strong class="jxr_keyword">long</strong> currentTime = System.currentTimeMillis();
<a name="509" href="#509">509</a>             <strong class="jxr_keyword">long</strong> deadline = currentTime + getKeepAliveTime(TimeUnit.MILLISECONDS);
<a name="510" href="#510">510</a>             <strong class="jxr_keyword">for</strong> (;;) {
<a name="511" href="#511">511</a>                 <strong class="jxr_keyword">try</strong> {
<a name="512" href="#512">512</a>                     <strong class="jxr_keyword">long</strong> waitTime = deadline - currentTime;
<a name="513" href="#513">513</a>                     <strong class="jxr_keyword">if</strong> (waitTime &lt;= 0) {
<a name="514" href="#514">514</a>                         <strong class="jxr_keyword">break</strong>;
<a name="515" href="#515">515</a>                     }
<a name="516" href="#516">516</a> 
<a name="517" href="#517">517</a>                     <strong class="jxr_keyword">try</strong> {
<a name="518" href="#518">518</a>                         session = waitingSessions.poll(waitTime, TimeUnit.MILLISECONDS);
<a name="519" href="#519">519</a>                         <strong class="jxr_keyword">break</strong>;
<a name="520" href="#520">520</a>                     } <strong class="jxr_keyword">finally</strong> {
<a name="521" href="#521">521</a>                         <strong class="jxr_keyword">if</strong> (session == <strong class="jxr_keyword">null</strong>) {
<a name="522" href="#522">522</a>                             currentTime = System.currentTimeMillis();
<a name="523" href="#523">523</a>                         }
<a name="524" href="#524">524</a>                     }
<a name="525" href="#525">525</a>                 } <strong class="jxr_keyword">catch</strong> (InterruptedException e) {
<a name="526" href="#526">526</a>                     <em class="jxr_comment">// Ignore.</em>
<a name="527" href="#527">527</a>                     <strong class="jxr_keyword">continue</strong>;
<a name="528" href="#528">528</a>                 }
<a name="529" href="#529">529</a>             }
<a name="530" href="#530">530</a>             <strong class="jxr_keyword">return</strong> session;
<a name="531" href="#531">531</a>         }
<a name="532" href="#532">532</a> 
<a name="533" href="#533">533</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> runTasks(<a href="../../../../../org/apache/mina/filter/executor/OrderedThreadPoolExecutor.html">SessionBuffer</a> buf) {
<a name="534" href="#534">534</a>             <strong class="jxr_keyword">for</strong> (;;) {
<a name="535" href="#535">535</a>                 Runnable task;
<a name="536" href="#536">536</a>                 <strong class="jxr_keyword">synchronized</strong> (buf.queue) {
<a name="537" href="#537">537</a>                     task = buf.queue.poll();
<a name="538" href="#538">538</a>     
<a name="539" href="#539">539</a>                     <strong class="jxr_keyword">if</strong> (task == <strong class="jxr_keyword">null</strong>) {
<a name="540" href="#540">540</a>                         buf.processingCompleted = <strong class="jxr_keyword">true</strong>;
<a name="541" href="#541">541</a>                         <strong class="jxr_keyword">break</strong>;
<a name="542" href="#542">542</a>                     }
<a name="543" href="#543">543</a>                 }
<a name="544" href="#544">544</a> 
<a name="545" href="#545">545</a>                 queueHandler.polled(OrderedThreadPoolExecutor.<strong class="jxr_keyword">this</strong>, (IoEvent) task);
<a name="546" href="#546">546</a> 
<a name="547" href="#547">547</a>                 runTask(task);
<a name="548" href="#548">548</a>             }
<a name="549" href="#549">549</a>         }
<a name="550" href="#550">550</a> 
<a name="551" href="#551">551</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> runTask(Runnable task) {
<a name="552" href="#552">552</a>             beforeExecute(thread, task);
<a name="553" href="#553">553</a>             <strong class="jxr_keyword">boolean</strong> ran = false;
<a name="554" href="#554">554</a>             <strong class="jxr_keyword">try</strong> {
<a name="555" href="#555">555</a>                 task.run();
<a name="556" href="#556">556</a>                 ran = <strong class="jxr_keyword">true</strong>;
<a name="557" href="#557">557</a>                 afterExecute(task, <strong class="jxr_keyword">null</strong>);
<a name="558" href="#558">558</a>                 completedTaskCount ++;
<a name="559" href="#559">559</a>             } <strong class="jxr_keyword">catch</strong> (RuntimeException e) {
<a name="560" href="#560">560</a>                 <strong class="jxr_keyword">if</strong> (!ran)
<a name="561" href="#561">561</a>                     afterExecute(task, e);
<a name="562" href="#562">562</a>                 <strong class="jxr_keyword">throw</strong> e;
<a name="563" href="#563">563</a>             }
<a name="564" href="#564">564</a>         }
<a name="565" href="#565">565</a>     }
<a name="566" href="#566">566</a> }
</pre>
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