abstractpollingioprocessor.html

MINA+API 关于MINA的API

<a name="259" href="#259">259</a>             registered = <strong class="jxr_keyword">true</strong>;
<a name="260" href="#260">260</a> 
<a name="261" href="#261">261</a>             <em class="jxr_comment">// Build the filter chain of this session.</em>
<a name="262" href="#262">262</a>             session.getService().getFilterChainBuilder().buildFilterChain(
<a name="263" href="#263">263</a>                     session.getFilterChain());
<a name="264" href="#264">264</a> 
<a name="265" href="#265">265</a>             <em class="jxr_comment">// DefaultIoFilterChain.CONNECT_FUTURE is cleared inside here</em>
<a name="266" href="#266">266</a>             <em class="jxr_comment">// in AbstractIoFilterChain.fireSessionOpened().</em>
<a name="267" href="#267">267</a>             ((<a href="../../../../org/apache/mina/common/AbstractIoService.html">AbstractIoService</a>) session.getService()).getListeners().fireSessionCreated(session);
<a name="268" href="#268">268</a>             notified = <strong class="jxr_keyword">true</strong>;
<a name="269" href="#269">269</a>         } <strong class="jxr_keyword">catch</strong> (Throwable e) {
<a name="270" href="#270">270</a>             <strong class="jxr_keyword">if</strong> (notified) {
<a name="271" href="#271">271</a>                 <em class="jxr_comment">// Clear the DefaultIoFilterChain.CONNECT_FUTURE attribute</em>
<a name="272" href="#272">272</a>                 <em class="jxr_comment">// and call ConnectFuture.setException().</em>
<a name="273" href="#273">273</a>                 scheduleRemove(session);
<a name="274" href="#274">274</a>                 session.getFilterChain().fireExceptionCaught(e);
<a name="275" href="#275">275</a>                 wakeup();
<a name="276" href="#276">276</a>             } <strong class="jxr_keyword">else</strong> {
<a name="277" href="#277">277</a>                 ExceptionMonitor.getInstance().exceptionCaught(e);
<a name="278" href="#278">278</a>                 <strong class="jxr_keyword">try</strong> {
<a name="279" href="#279">279</a>                     destroy(session);
<a name="280" href="#280">280</a>                 } <strong class="jxr_keyword">catch</strong> (Exception e1) {
<a name="281" href="#281">281</a>                     ExceptionMonitor.getInstance().exceptionCaught(e1);
<a name="282" href="#282">282</a>                 } <strong class="jxr_keyword">finally</strong> {
<a name="283" href="#283">283</a>                     registered = false;
<a name="284" href="#284">284</a>                 }
<a name="285" href="#285">285</a>             }
<a name="286" href="#286">286</a>         }
<a name="287" href="#287">287</a>         <strong class="jxr_keyword">return</strong> registered;
<a name="288" href="#288">288</a>     }
<a name="289" href="#289">289</a> 
<a name="290" href="#290">290</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> remove() {
<a name="291" href="#291">291</a>         <strong class="jxr_keyword">int</strong> removedSessions = 0;
<a name="292" href="#292">292</a>         <strong class="jxr_keyword">for</strong> (; ;) {
<a name="293" href="#293">293</a>             T session = removingSessions.poll();
<a name="294" href="#294">294</a> 
<a name="295" href="#295">295</a>             <strong class="jxr_keyword">if</strong> (session == <strong class="jxr_keyword">null</strong>) {
<a name="296" href="#296">296</a>                 <strong class="jxr_keyword">break</strong>;
<a name="297" href="#297">297</a>             }
<a name="298" href="#298">298</a> 
<a name="299" href="#299">299</a>             <a href="../../../../org/apache/mina/common/AbstractPollingIoProcessor.html">SessionState</a> state = state(session);
<a name="300" href="#300">300</a>             <strong class="jxr_keyword">switch</strong> (state) {
<a name="301" href="#301">301</a>             <strong class="jxr_keyword">case</strong> OPEN:
<a name="302" href="#302">302</a>                 <strong class="jxr_keyword">if</strong> (removeNow(session)) {
<a name="303" href="#303">303</a>                     removedSessions ++;
<a name="304" href="#304">304</a>                 }
<a name="305" href="#305">305</a>                 <strong class="jxr_keyword">break</strong>;
<a name="306" href="#306">306</a>             <strong class="jxr_keyword">case</strong> CLOSED:
<a name="307" href="#307">307</a>                 <em class="jxr_comment">// Skip if channel is already closed</em>
<a name="308" href="#308">308</a>                 <strong class="jxr_keyword">break</strong>;
<a name="309" href="#309">309</a>             <strong class="jxr_keyword">case</strong> PREPARING:
<a name="310" href="#310">310</a>                 <em class="jxr_comment">// Retry later if session is not yet fully initialized.</em>
<a name="311" href="#311">311</a>                 <em class="jxr_comment">// (In case that Session.close() is called before addSession() is processed)</em>
<a name="312" href="#312">312</a>                 scheduleRemove(session);
<a name="313" href="#313">313</a>                 <strong class="jxr_keyword">return</strong> removedSessions;
<a name="314" href="#314">314</a>             <strong class="jxr_keyword">default</strong>:
<a name="315" href="#315">315</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(String.valueOf(state));
<a name="316" href="#316">316</a>             }
<a name="317" href="#317">317</a>         }
<a name="318" href="#318">318</a> 
<a name="319" href="#319">319</a>         <strong class="jxr_keyword">return</strong> removedSessions;
<a name="320" href="#320">320</a>     }
<a name="321" href="#321">321</a> 
<a name="322" href="#322">322</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> removeNow(T session) {
<a name="323" href="#323">323</a>         clearWriteRequestQueue(session);
<a name="324" href="#324">324</a> 
<a name="325" href="#325">325</a>         <strong class="jxr_keyword">try</strong> {
<a name="326" href="#326">326</a>             destroy(session);
<a name="327" href="#327">327</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a name="328" href="#328">328</a>         } <strong class="jxr_keyword">catch</strong> (Exception e) {
<a name="329" href="#329">329</a>             session.getFilterChain().fireExceptionCaught(e);
<a name="330" href="#330">330</a>         } <strong class="jxr_keyword">finally</strong> {
<a name="331" href="#331">331</a>             clearWriteRequestQueue(session);
<a name="332" href="#332">332</a>             ((<a href="../../../../org/apache/mina/common/AbstractIoService.html">AbstractIoService</a>) session.getService()).getListeners().fireSessionDestroyed(session);
<a name="333" href="#333">333</a>         }
<a name="334" href="#334">334</a>         <strong class="jxr_keyword">return</strong> false;
<a name="335" href="#335">335</a>     }
<a name="336" href="#336">336</a> 
<a name="337" href="#337">337</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> clearWriteRequestQueue(T session) {
<a name="338" href="#338">338</a>         <a href="../../../../org/apache/mina/common/WriteRequestQueue.html">WriteRequestQueue</a> writeRequestQueue = session.getWriteRequestQueue();
<a name="339" href="#339">339</a>         <a href="../../../../org/apache/mina/common/WriteRequest.html">WriteRequest</a> req;
<a name="340" href="#340">340</a>         
<a name="341" href="#341">341</a>         List&lt;WriteRequest&gt; failedRequests = <strong class="jxr_keyword">new</strong> ArrayList&lt;WriteRequest&gt;();
<a name="342" href="#342">342</a>     
<a name="343" href="#343">343</a>         <strong class="jxr_keyword">if</strong> ((req = writeRequestQueue.poll(session)) != <strong class="jxr_keyword">null</strong>) {
<a name="344" href="#344">344</a>             Object m = req.getMessage();
<a name="345" href="#345">345</a>             <strong class="jxr_keyword">if</strong> (m instanceof IoBuffer) {
<a name="346" href="#346">346</a>                 <a href="../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> buf = (IoBuffer) req.getMessage();
<a name="347" href="#347">347</a>     
<a name="348" href="#348">348</a>                 <em class="jxr_comment">// The first unwritten empty buffer must be</em>
<a name="349" href="#349">349</a>                 <em class="jxr_comment">// forwarded to the filter chain.</em>
<a name="350" href="#350">350</a>                 <strong class="jxr_keyword">if</strong> (buf.hasRemaining()) {
<a name="351" href="#351">351</a>                     buf.reset();
<a name="352" href="#352">352</a>                     failedRequests.add(req);
<a name="353" href="#353">353</a>                 } <strong class="jxr_keyword">else</strong> {
<a name="354" href="#354">354</a>                     session.getFilterChain().fireMessageSent(req);
<a name="355" href="#355">355</a>                 }
<a name="356" href="#356">356</a>             } <strong class="jxr_keyword">else</strong> {
<a name="357" href="#357">357</a>                 failedRequests.add(req);
<a name="358" href="#358">358</a>             }
<a name="359" href="#359">359</a>     
<a name="360" href="#360">360</a>             <em class="jxr_comment">// Discard others.</em>
<a name="361" href="#361">361</a>             <strong class="jxr_keyword">while</strong> ((req = writeRequestQueue.poll(session)) != <strong class="jxr_keyword">null</strong>) {
<a name="362" href="#362">362</a>                 failedRequests.add(req);
<a name="363" href="#363">363</a>             }
<a name="364" href="#364">364</a>         }
<a name="365" href="#365">365</a>         
<a name="366" href="#366">366</a>         <em class="jxr_comment">// Create an exception and notify.</em>
<a name="367" href="#367">367</a>         <strong class="jxr_keyword">if</strong> (!failedRequests.isEmpty()) {
<a name="368" href="#368">368</a>             <a href="../../../../org/apache/mina/common/WriteToClosedSessionException.html">WriteToClosedSessionException</a> cause = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/mina/common/WriteToClosedSessionException.html">WriteToClosedSessionException</a>(failedRequests);
<a name="369" href="#369">369</a>             <strong class="jxr_keyword">for</strong> (WriteRequest r: failedRequests) {
<a name="370" href="#370">370</a>                 session.decreaseScheduledBytesAndMessages(r);
<a name="371" href="#371">371</a>                 r.getFuture().setException(cause);
<a name="372" href="#372">372</a>             }
<a name="373" href="#373">373</a>             session.getFilterChain().fireExceptionCaught(cause);
<a name="374" href="#374">374</a>         }
<a name="375" href="#375">375</a>     }
<a name="376" href="#376">376</a> 
<a name="377" href="#377">377</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> process() <strong class="jxr_keyword">throws</strong> Exception {
<a name="378" href="#378">378</a>         <strong class="jxr_keyword">for</strong> (Iterator&lt;T&gt; i = selectedSessions(); i.hasNext();) {
<a name="379" href="#379">379</a>             process(i.next());
<a name="380" href="#380">380</a>             i.remove();
<a name="381" href="#381">381</a>         }
<a name="382" href="#382">382</a>     }
<a name="383" href="#383">383</a> 
<a name="384" href="#384">384</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> process(T session) {
<a name="385" href="#385">385</a> 
<a name="386" href="#386">386</a>         <strong class="jxr_keyword">if</strong> (isReadable(session) &amp;&amp; session.getTrafficMask().isReadable()) {
<a name="387" href="#387">387</a>             read(session);
<a name="388" href="#388">388</a>         }
<a name="389" href="#389">389</a> 
<a name="390" href="#390">390</a>         <strong class="jxr_keyword">if</strong> (isWritable(session) &amp;&amp; session.getTrafficMask().isWritable()) {
<a name="391" href="#391">391</a>             scheduleFlush(session);
<a name="392" href="#392">392</a>         }