keepalivefilter.html

MINA+API 关于MINA的API

<a name="229" href="#229">229</a>     }
<a name="230" href="#230">230</a> 
<a name="231" href="#231">231</a>     @Override
<a name="232" href="#232">232</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> onPostRemove(
<a name="233" href="#233">233</a>             <a href="../../../../../org/apache/mina/common/IoFilterChain.html">IoFilterChain</a> parent, String name, <a href="../../../../../org/apache/mina/common/IoFilter.html">NextFilter</a> nextFilter) <strong class="jxr_keyword">throws</strong> Exception {
<a name="234" href="#234">234</a>         resetStatus(parent.getSession());
<a name="235" href="#235">235</a>     }
<a name="236" href="#236">236</a> 
<a name="237" href="#237">237</a>     @Override
<a name="238" href="#238">238</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> messageReceived(
<a name="239" href="#239">239</a>             <a href="../../../../../org/apache/mina/common/IoFilter.html">NextFilter</a> nextFilter, <a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session, Object message) <strong class="jxr_keyword">throws</strong> Exception {
<a name="240" href="#240">240</a>         <strong class="jxr_keyword">try</strong> {
<a name="241" href="#241">241</a>             <strong class="jxr_keyword">if</strong> (messageFactory.isRequest(session, message)) {
<a name="242" href="#242">242</a>                 Object pongMessage =
<a name="243" href="#243">243</a>                     messageFactory.getResponse(session, message);
<a name="244" href="#244">244</a>                 
<a name="245" href="#245">245</a>                 <strong class="jxr_keyword">if</strong> (pongMessage != <strong class="jxr_keyword">null</strong>) {
<a name="246" href="#246">246</a>                     nextFilter.filterWrite(
<a name="247" href="#247">247</a>                             session, <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/mina/common/DefaultWriteRequest.html">DefaultWriteRequest</a>(pongMessage));
<a name="248" href="#248">248</a>                 }
<a name="249" href="#249">249</a>             }
<a name="250" href="#250">250</a>             
<a name="251" href="#251">251</a>             <strong class="jxr_keyword">if</strong> (messageFactory.isResponse(session, message)) {
<a name="252" href="#252">252</a>                 resetStatus(session);
<a name="253" href="#253">253</a>             }
<a name="254" href="#254">254</a>         } <strong class="jxr_keyword">finally</strong> {
<a name="255" href="#255">255</a>             <strong class="jxr_keyword">if</strong> (!isKeepAliveMessage(session, message)) {
<a name="256" href="#256">256</a>                 nextFilter.messageReceived(session, message);
<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> 
<a name="261" href="#261">261</a>     @Override
<a name="262" href="#262">262</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> messageSent(
<a name="263" href="#263">263</a>             <a href="../../../../../org/apache/mina/common/IoFilter.html">NextFilter</a> nextFilter, <a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session, <a href="../../../../../org/apache/mina/common/WriteRequest.html">WriteRequest</a> writeRequest) <strong class="jxr_keyword">throws</strong> Exception {
<a name="264" href="#264">264</a>         Object message = writeRequest.getMessage();
<a name="265" href="#265">265</a>         <strong class="jxr_keyword">if</strong> (!isKeepAliveMessage(session, message)) {
<a name="266" href="#266">266</a>             nextFilter.messageSent(session, writeRequest);
<a name="267" href="#267">267</a>         }
<a name="268" href="#268">268</a>     }
<a name="269" href="#269">269</a> 
<a name="270" href="#270">270</a>     @Override
<a name="271" href="#271">271</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> sessionIdle(
<a name="272" href="#272">272</a>             <a href="../../../../../org/apache/mina/common/IoFilter.html">NextFilter</a> nextFilter, <a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session, <a href="../../../../../org/apache/mina/common/IdleStatus.html">IdleStatus</a> status) <strong class="jxr_keyword">throws</strong> Exception {
<a name="273" href="#273">273</a>         <strong class="jxr_keyword">try</strong> {
<a name="274" href="#274">274</a>             <strong class="jxr_keyword">if</strong> (status == IdleStatus.READER_IDLE) {
<a name="275" href="#275">275</a>                 <strong class="jxr_keyword">if</strong> (!session.containsAttribute(WAITING_FOR_RESPONSE)) {
<a name="276" href="#276">276</a>                     Object pingMessage = messageFactory.getRequest(session);
<a name="277" href="#277">277</a>                     <strong class="jxr_keyword">if</strong> (pingMessage != <strong class="jxr_keyword">null</strong>) {
<a name="278" href="#278">278</a>                         nextFilter.filterWrite(
<a name="279" href="#279">279</a>                                 session,
<a name="280" href="#280">280</a>                                 <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/mina/common/DefaultWriteRequest.html">DefaultWriteRequest</a>(pingMessage));
<a name="281" href="#281">281</a>                         
<a name="282" href="#282">282</a>                         <em class="jxr_comment">// If policy is OFF, there's no need to wait for</em>
<a name="283" href="#283">283</a>                         <em class="jxr_comment">// the response.</em>
<a name="284" href="#284">284</a>                         <strong class="jxr_keyword">if</strong> (getPolicy() != KeepAlivePolicy.OFF) {
<a name="285" href="#285">285</a>                             markStatus(session);
<a name="286" href="#286">286</a>                         } <strong class="jxr_keyword">else</strong> {
<a name="287" href="#287">287</a>                             resetStatus(session);
<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">else</strong> {
<a name="291" href="#291">291</a>                     resetStatus(session);
<a name="292" href="#292">292</a>                     <strong class="jxr_keyword">switch</strong> (getPolicy()) {
<a name="293" href="#293">293</a>                     <strong class="jxr_keyword">case</strong> OFF:
<a name="294" href="#294">294</a>                         <strong class="jxr_keyword">break</strong>;
<a name="295" href="#295">295</a>                     <strong class="jxr_keyword">case</strong> LOG:
<a name="296" href="#296">296</a>                         logTimeout(session);
<a name="297" href="#297">297</a>                         <strong class="jxr_keyword">break</strong>;
<a name="298" href="#298">298</a>                     <strong class="jxr_keyword">case</strong> EXCEPTION:
<a name="299" href="#299">299</a>                         <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/mina/filter/keepalive/KeepAliveTimeoutException.html">KeepAliveTimeoutException</a>(
<a name="300" href="#300">300</a>                                 getTimeoutMessage());
<a name="301" href="#301">301</a>                     <strong class="jxr_keyword">case</strong> CLOSE:
<a name="302" href="#302">302</a>                         logTimeout(session);
<a name="303" href="#303">303</a>                         session.close();
<a name="304" href="#304">304</a>                         <strong class="jxr_keyword">break</strong>;
<a name="305" href="#305">305</a>                     <strong class="jxr_keyword">default</strong>:
<a name="306" href="#306">306</a>                         <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> InternalError();
<a name="307" href="#307">307</a>                     }
<a name="308" href="#308">308</a>                 }
<a name="309" href="#309">309</a>             }
<a name="310" href="#310">310</a>         } <strong class="jxr_keyword">finally</strong> {
<a name="311" href="#311">311</a>             nextFilter.sessionIdle(session, status);
<a name="312" href="#312">312</a>         }
<a name="313" href="#313">313</a>     }
<a name="314" href="#314">314</a> 
<a name="315" href="#315">315</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> logTimeout(<a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session) {
<a name="316" href="#316">316</a>         <strong class="jxr_keyword">if</strong> (logger.isWarnEnabled()) {
<a name="317" href="#317">317</a>             logger.warn(getTimeoutMessage());
<a name="318" href="#318">318</a>         }
<a name="319" href="#319">319</a>     }
<a name="320" href="#320">320</a> 
<a name="321" href="#321">321</a>     <strong class="jxr_keyword">private</strong> String getTimeoutMessage() {
<a name="322" href="#322">322</a>         <strong class="jxr_keyword">return</strong> <span class="jxr_string">"Keep-alive response message was not received within "</span> + 
<a name="323" href="#323">323</a>                getKeepAliveRequestTimeout() + <span class="jxr_string">" second(s)."</span>;
<a name="324" href="#324">324</a>     }
<a name="325" href="#325">325</a> 
<a name="326" href="#326">326</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> markStatus(<a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session) {
<a name="327" href="#327">327</a>         session.getConfig().setIdleTime(
<a name="328" href="#328">328</a>                 IdleStatus.READER_IDLE, getKeepAliveRequestTimeout());
<a name="329" href="#329">329</a>         session.setAttribute(WAITING_FOR_RESPONSE);
<a name="330" href="#330">330</a>     }
<a name="331" href="#331">331</a> 
<a name="332" href="#332">332</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> resetStatus(<a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session) {
<a name="333" href="#333">333</a>         session.getConfig().setIdleTime(
<a name="334" href="#334">334</a>                 IdleStatus.READER_IDLE, getKeepAliveRequestInterval());
<a name="335" href="#335">335</a>         session.removeAttribute(WAITING_FOR_RESPONSE);
<a name="336" href="#336">336</a>     }
<a name="337" href="#337">337</a>     
<a name="338" href="#338">338</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> isKeepAliveMessage(<a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session, Object message) {
<a name="339" href="#339">339</a>         <strong class="jxr_keyword">return</strong> messageFactory.isRequest(session, message) ||
<a name="340" href="#340">340</a>                messageFactory.isResponse(session, message);
<a name="341" href="#341">341</a>     }
<a name="342" href="#342">342</a> }
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