demuxingiohandler.html

MINA+API 关于MINA的API

<a name="243" href="#243">243</a>                     <span class="jxr_string">"No handler found for message type: "</span> +
<a name="244" href="#244">244</a>                     message.getClass().getSimpleName());
<a name="245" href="#245">245</a>         }
<a name="246" href="#246">246</a>     }
<a name="247" href="#247">247</a> 
<a name="248" href="#248">248</a>     @Override
<a name="249" href="#249">249</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">void</strong> exceptionCaught(<a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session, Throwable cause) <strong class="jxr_keyword">throws</strong> Exception {
<a name="250" href="#250">250</a>         ExceptionHandler&lt;Throwable&gt; handler = findExceptionHandler(cause.getClass());
<a name="251" href="#251">251</a>         <strong class="jxr_keyword">if</strong> (handler != <strong class="jxr_keyword">null</strong>) {
<a name="252" href="#252">252</a>             handler.exceptionCaught(session, cause);
<a name="253" href="#253">253</a>         } <strong class="jxr_keyword">else</strong> {
<a name="254" href="#254">254</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/mina/common/UnknownMessageTypeException.html">UnknownMessageTypeException</a>(
<a name="255" href="#255">255</a>                     <span class="jxr_string">"No handler found for exception type: "</span> +
<a name="256" href="#256">256</a>                     cause.getClass().getSimpleName());
<a name="257" href="#257">257</a>         }
<a name="258" href="#258">258</a>     }
<a name="259" href="#259">259</a> 
<a name="260" href="#260">260</a>     <strong class="jxr_keyword">protected</strong> MessageHandler&lt;Object&gt; findReceivedMessageHandler(Class&lt;?&gt; type) {
<a name="261" href="#261">261</a>         <strong class="jxr_keyword">return</strong> findReceivedMessageHandler(type, <strong class="jxr_keyword">null</strong>);
<a name="262" href="#262">262</a>     }
<a name="263" href="#263">263</a> 
<a name="264" href="#264">264</a>     <strong class="jxr_keyword">protected</strong> MessageHandler&lt;Object&gt; findSentMessageHandler(Class&lt;?&gt; type) {
<a name="265" href="#265">265</a>         <strong class="jxr_keyword">return</strong> findSentMessageHandler(type, <strong class="jxr_keyword">null</strong>);
<a name="266" href="#266">266</a>     }
<a name="267" href="#267">267</a> 
<a name="268" href="#268">268</a>     <strong class="jxr_keyword">protected</strong> ExceptionHandler&lt;Throwable&gt; findExceptionHandler(Class&lt;? <strong class="jxr_keyword">extends</strong> Throwable&gt; type) {
<a name="269" href="#269">269</a>         <strong class="jxr_keyword">return</strong> findExceptionHandler(type, <strong class="jxr_keyword">null</strong>);
<a name="270" href="#270">270</a>     }
<a name="271" href="#271">271</a> 
<a name="272" href="#272">272</a>     @SuppressWarnings(<span class="jxr_string">"unchecked"</span>)
<a name="273" href="#273">273</a>     <strong class="jxr_keyword">private</strong> MessageHandler&lt;Object&gt; findReceivedMessageHandler(
<a name="274" href="#274">274</a>             Class type, Set&lt;Class&gt; triedClasses) {
<a name="275" href="#275">275</a>         
<a name="276" href="#276">276</a>         <strong class="jxr_keyword">return</strong> (MessageHandler&lt;Object&gt;) findHandler(
<a name="277" href="#277">277</a>                 receivedMessageHandlers, receivedMessageHandlerCache, type, triedClasses);
<a name="278" href="#278">278</a>     }
<a name="279" href="#279">279</a> 
<a name="280" href="#280">280</a>     @SuppressWarnings(<span class="jxr_string">"unchecked"</span>)
<a name="281" href="#281">281</a>     <strong class="jxr_keyword">private</strong> MessageHandler&lt;Object&gt; findSentMessageHandler(
<a name="282" href="#282">282</a>             Class type, Set&lt;Class&gt; triedClasses) {
<a name="283" href="#283">283</a>         
<a name="284" href="#284">284</a>         <strong class="jxr_keyword">return</strong> (MessageHandler&lt;Object&gt;) findHandler(
<a name="285" href="#285">285</a>                 sentMessageHandlers, sentMessageHandlerCache, type, triedClasses);
<a name="286" href="#286">286</a>     }
<a name="287" href="#287">287</a> 
<a name="288" href="#288">288</a>     @SuppressWarnings(<span class="jxr_string">"unchecked"</span>)
<a name="289" href="#289">289</a>     <strong class="jxr_keyword">private</strong> ExceptionHandler&lt;Throwable&gt; findExceptionHandler(
<a name="290" href="#290">290</a>             Class type, Set&lt;Class&gt; triedClasses) {
<a name="291" href="#291">291</a>         
<a name="292" href="#292">292</a>         <strong class="jxr_keyword">return</strong> (ExceptionHandler&lt;Throwable&gt;) findHandler(
<a name="293" href="#293">293</a>                 exceptionHandlers, exceptionHandlerCache, type, triedClasses);
<a name="294" href="#294">294</a>     }
<a name="295" href="#295">295</a> 
<a name="296" href="#296">296</a>     @SuppressWarnings(<span class="jxr_string">"unchecked"</span>)
<a name="297" href="#297">297</a>     <strong class="jxr_keyword">private</strong> Object findHandler(
<a name="298" href="#298">298</a>             Map handlers, Map handlerCache,
<a name="299" href="#299">299</a>             Class type, Set&lt;Class&gt; triedClasses) {
<a name="300" href="#300">300</a> 
<a name="301" href="#301">301</a>         Object handler = <strong class="jxr_keyword">null</strong>;
<a name="302" href="#302">302</a> 
<a name="303" href="#303">303</a>         <strong class="jxr_keyword">if</strong> (triedClasses != <strong class="jxr_keyword">null</strong> &amp;&amp; triedClasses.contains(type)) {
<a name="304" href="#304">304</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a name="305" href="#305">305</a>         }
<a name="306" href="#306">306</a> 
<a name="307" href="#307">307</a>         <em class="jxr_comment">/*</em>
<a name="308" href="#308">308</a> <em class="jxr_comment">         * Try the cache first.</em>
<a name="309" href="#309">309</a> <em class="jxr_comment">         */</em>
<a name="310" href="#310">310</a>         handler = handlerCache.get(type);
<a name="311" href="#311">311</a>         <strong class="jxr_keyword">if</strong> (handler != <strong class="jxr_keyword">null</strong>) {
<a name="312" href="#312">312</a>             <strong class="jxr_keyword">return</strong> handler;
<a name="313" href="#313">313</a>         }
<a name="314" href="#314">314</a> 
<a name="315" href="#315">315</a>         <em class="jxr_comment">/*</em>
<a name="316" href="#316">316</a> <em class="jxr_comment">         * Try the registered handlers for an immediate match.</em>
<a name="317" href="#317">317</a> <em class="jxr_comment">         */</em>
<a name="318" href="#318">318</a>         handler = handlers.get(type);
<a name="319" href="#319">319</a> 
<a name="320" href="#320">320</a>         <strong class="jxr_keyword">if</strong> (handler == <strong class="jxr_keyword">null</strong>) {
<a name="321" href="#321">321</a>             <em class="jxr_comment">/*</em>
<a name="322" href="#322">322</a> <em class="jxr_comment">             * No immediate match could be found. Search the type's interfaces.</em>
<a name="323" href="#323">323</a> <em class="jxr_comment">             */</em>
<a name="324" href="#324">324</a> 
<a name="325" href="#325">325</a>             <strong class="jxr_keyword">if</strong> (triedClasses == <strong class="jxr_keyword">null</strong>) {
<a name="326" href="#326">326</a>                 triedClasses = <strong class="jxr_keyword">new</strong> IdentityHashSet&lt;Class&gt;();
<a name="327" href="#327">327</a>             }
<a name="328" href="#328">328</a>             triedClasses.add(type);
<a name="329" href="#329">329</a> 
<a name="330" href="#330">330</a>             Class[] interfaces = type.getInterfaces();
<a name="331" href="#331">331</a>             <strong class="jxr_keyword">for</strong> (Class element : interfaces) {
<a name="332" href="#332">332</a>                 handler = findHandler(handlers, handlerCache, element, triedClasses);
<a name="333" href="#333">333</a>                 <strong class="jxr_keyword">if</strong> (handler != <strong class="jxr_keyword">null</strong>) {
<a name="334" href="#334">334</a>                     <strong class="jxr_keyword">break</strong>;
<a name="335" href="#335">335</a>                 }
<a name="336" href="#336">336</a>             }
<a name="337" href="#337">337</a>         }
<a name="338" href="#338">338</a> 
<a name="339" href="#339">339</a>         <strong class="jxr_keyword">if</strong> (handler == <strong class="jxr_keyword">null</strong>) {
<a name="340" href="#340">340</a>             <em class="jxr_comment">/*</em>
<a name="341" href="#341">341</a> <em class="jxr_comment">             * No match in type's interfaces could be found. Search the</em>
<a name="342" href="#342">342</a> <em class="jxr_comment">             * superclass.</em>
<a name="343" href="#343">343</a> <em class="jxr_comment">             */</em>
<a name="344" href="#344">344</a>             Class superclass = type.getSuperclass();
<a name="345" href="#345">345</a>             <strong class="jxr_keyword">if</strong> (superclass != <strong class="jxr_keyword">null</strong>) {
<a name="346" href="#346">346</a>                 handler = findHandler(handlers, handlerCache, superclass, <strong class="jxr_keyword">null</strong>);
<a name="347" href="#347">347</a>             }
<a name="348" href="#348">348</a>         }
<a name="349" href="#349">349</a> 
<a name="350" href="#350">350</a>         <em class="jxr_comment">/*</em>
<a name="351" href="#351">351</a> <em class="jxr_comment">         * Make sure the handler is added to the cache. By updating the cache</em>
<a name="352" href="#352">352</a> <em class="jxr_comment">         * here all the types (superclasses and interfaces) in the path which</em>
<a name="353" href="#353">353</a> <em class="jxr_comment">         * led to a match will be cached along with the immediate message type.</em>
<a name="354" href="#354">354</a> <em class="jxr_comment">         */</em>
<a name="355" href="#355">355</a>         <strong class="jxr_keyword">if</strong> (handler != <strong class="jxr_keyword">null</strong>) {
<a name="356" href="#356">356</a>             handlerCache.put(type, handler);
<a name="357" href="#357">357</a>         }
<a name="358" href="#358">358</a> 
<a name="359" href="#359">359</a>         <strong class="jxr_keyword">return</strong> handler;
<a name="360" href="#360">360</a>     }
<a name="361" href="#361">361</a> }
</pre>
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