requestresponsefilter.html

MINA+API 关于MINA的API

<a name="121" href="#121">121</a>         <strong class="jxr_keyword">if</strong> (requestId == <strong class="jxr_keyword">null</strong>) {
<a name="122" href="#122">122</a>             <em class="jxr_comment">// Not a response message.  Ignore.</em>
<a name="123" href="#123">123</a>             nextFilter.messageReceived(session, message);
<a name="124" href="#124">124</a>             <strong class="jxr_keyword">return</strong>;
<a name="125" href="#125">125</a>         }
<a name="126" href="#126">126</a> 
<a name="127" href="#127">127</a>         <em class="jxr_comment">// Retrieve (or remove) the corresponding request.</em>
<a name="128" href="#128">128</a>         <a href="../../../../../org/apache/mina/filter/reqres/ResponseType.html">ResponseType</a> type = responseInspector.getResponseType(message);
<a name="129" href="#129">129</a>         <strong class="jxr_keyword">if</strong> (type == <strong class="jxr_keyword">null</strong>) {
<a name="130" href="#130">130</a>             nextFilter.exceptionCaught(session, <strong class="jxr_keyword">new</strong> IllegalStateException(
<a name="131" href="#131">131</a>                     responseInspector.getClass().getName()
<a name="132" href="#132">132</a>                             + <span class="jxr_string">"#getResponseType() may not return null."</span>));
<a name="133" href="#133">133</a>         }
<a name="134" href="#134">134</a> 
<a name="135" href="#135">135</a>         Map&lt;Object, Request&gt; requestStore = getRequestStore(session);
<a name="136" href="#136">136</a> 
<a name="137" href="#137">137</a>         <a href="../../../../../org/apache/mina/filter/reqres/Request.html">Request</a> request;
<a name="138" href="#138">138</a>         <strong class="jxr_keyword">switch</strong> (type) {
<a name="139" href="#139">139</a>         <strong class="jxr_keyword">case</strong> WHOLE:
<a name="140" href="#140">140</a>         <strong class="jxr_keyword">case</strong> PARTIAL_LAST:
<a name="141" href="#141">141</a>             <strong class="jxr_keyword">synchronized</strong> (requestStore) {
<a name="142" href="#142">142</a>                 request = requestStore.remove(requestId);
<a name="143" href="#143">143</a>             }
<a name="144" href="#144">144</a>             <strong class="jxr_keyword">break</strong>;
<a name="145" href="#145">145</a>         <strong class="jxr_keyword">case</strong> PARTIAL:
<a name="146" href="#146">146</a>             <strong class="jxr_keyword">synchronized</strong> (requestStore) {
<a name="147" href="#147">147</a>                 request = requestStore.get(requestId);
<a name="148" href="#148">148</a>             }
<a name="149" href="#149">149</a>             <strong class="jxr_keyword">break</strong>;
<a name="150" href="#150">150</a>         <strong class="jxr_keyword">default</strong>:
<a name="151" href="#151">151</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> InternalError();
<a name="152" href="#152">152</a>         }
<a name="153" href="#153">153</a> 
<a name="154" href="#154">154</a>         <strong class="jxr_keyword">if</strong> (request == <strong class="jxr_keyword">null</strong>) {
<a name="155" href="#155">155</a>             <em class="jxr_comment">// A response message without request. Swallow the event because</em>
<a name="156" href="#156">156</a>             <em class="jxr_comment">// the response might have arrived too late.</em>
<a name="157" href="#157">157</a>             <strong class="jxr_keyword">if</strong> (logger.isWarnEnabled()) {
<a name="158" href="#158">158</a>                 logger.warn(<span class="jxr_string">"Unknown request ID '"</span> + requestId
<a name="159" href="#159">159</a>                         + <span class="jxr_string">"' for the response message. Timed out already?: "</span>
<a name="160" href="#160">160</a>                         + message);
<a name="161" href="#161">161</a>             }
<a name="162" href="#162">162</a>         } <strong class="jxr_keyword">else</strong> {
<a name="163" href="#163">163</a>             <em class="jxr_comment">// Found a matching request.</em>
<a name="164" href="#164">164</a>             <em class="jxr_comment">// Cancel the timeout task if needed.</em>
<a name="165" href="#165">165</a>             <strong class="jxr_keyword">if</strong> (type != ResponseType.PARTIAL) {
<a name="166" href="#166">166</a>                 ScheduledFuture&lt;?&gt; scheduledFuture = request.getTimeoutFuture();
<a name="167" href="#167">167</a>                 <strong class="jxr_keyword">if</strong> (scheduledFuture != <strong class="jxr_keyword">null</strong>) {
<a name="168" href="#168">168</a>                     scheduledFuture.cancel(false);
<a name="169" href="#169">169</a>                     Set&lt;Request&gt; unrespondedRequests = getUnrespondedRequestStore(session);
<a name="170" href="#170">170</a>                     <strong class="jxr_keyword">synchronized</strong> (unrespondedRequests) {
<a name="171" href="#171">171</a>                         unrespondedRequests.remove(request);
<a name="172" href="#172">172</a>                     }
<a name="173" href="#173">173</a>                 }
<a name="174" href="#174">174</a>             }
<a name="175" href="#175">175</a> 
<a name="176" href="#176">176</a>             <em class="jxr_comment">// And forward the event.</em>
<a name="177" href="#177">177</a>             <a href="../../../../../org/apache/mina/filter/reqres/Response.html">Response</a> response = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/mina/filter/reqres/Response.html">Response</a>(request, message, type);
<a name="178" href="#178">178</a>             request.signal(response);
<a name="179" href="#179">179</a>             nextFilter.messageReceived(session, response);
<a name="180" href="#180">180</a>         }
<a name="181" href="#181">181</a>     }
<a name="182" href="#182">182</a> 
<a name="183" href="#183">183</a>     @Override
<a name="184" href="#184">184</a>     <strong class="jxr_keyword">protected</strong> Object doFilterWrite(
<a name="185" href="#185">185</a>             <strong class="jxr_keyword">final</strong> <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="186" href="#186">186</a>         Object message = writeRequest.getMessage();
<a name="187" href="#187">187</a>         <strong class="jxr_keyword">if</strong> (!(message instanceof Request)) {
<a name="188" href="#188">188</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a name="189" href="#189">189</a>         }
<a name="190" href="#190">190</a> 
<a name="191" href="#191">191</a>         <strong class="jxr_keyword">final</strong> <a href="../../../../../org/apache/mina/filter/reqres/Request.html">Request</a> request = (Request) message;
<a name="192" href="#192">192</a>         <strong class="jxr_keyword">if</strong> (request.getTimeoutFuture() != <strong class="jxr_keyword">null</strong>) {
<a name="193" href="#193">193</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"Request can not be reused."</span>);
<a name="194" href="#194">194</a>         }
<a name="195" href="#195">195</a> 
<a name="196" href="#196">196</a>         Map&lt;Object, Request&gt; requestStore = getRequestStore(session);
<a name="197" href="#197">197</a>         Object oldValue = <strong class="jxr_keyword">null</strong>;
<a name="198" href="#198">198</a>         Object requestId = request.getId();
<a name="199" href="#199">199</a>         <strong class="jxr_keyword">synchronized</strong> (requestStore) {
<a name="200" href="#200">200</a>             oldValue = requestStore.get(requestId);
<a name="201" href="#201">201</a>             <strong class="jxr_keyword">if</strong> (oldValue == <strong class="jxr_keyword">null</strong>) {
<a name="202" href="#202">202</a>                 requestStore.put(requestId, request);
<a name="203" href="#203">203</a>             }
<a name="204" href="#204">204</a>         }
<a name="205" href="#205">205</a>         <strong class="jxr_keyword">if</strong> (oldValue != <strong class="jxr_keyword">null</strong>) {
<a name="206" href="#206">206</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(
<a name="207" href="#207">207</a>                     <span class="jxr_string">"Duplicate request ID: "</span> + request.getId());
<a name="208" href="#208">208</a>         }
<a name="209" href="#209">209</a> 
<a name="210" href="#210">210</a>         <em class="jxr_comment">// Schedule a task to be executed on timeout.</em>
<a name="211" href="#211">211</a>         <em class="jxr_comment">// Find the timeout date avoiding overflow.</em>
<a name="212" href="#212">212</a>         Date timeoutDate = <strong class="jxr_keyword">new</strong> Date(System.currentTimeMillis());
<a name="213" href="#213">213</a>         <strong class="jxr_keyword">if</strong> (Long.MAX_VALUE - request.getTimeoutMillis() &lt; timeoutDate
<a name="214" href="#214">214</a>                 .getTime()) {
<a name="215" href="#215">215</a>             timeoutDate.setTime(Long.MAX_VALUE);
<a name="216" href="#216">216</a>         } <strong class="jxr_keyword">else</strong> {
<a name="217" href="#217">217</a>             timeoutDate.setTime(timeoutDate.getTime()
<a name="218" href="#218">218</a>                     + request.getTimeoutMillis());
<a name="219" href="#219">219</a>         }
<a name="220" href="#220">220</a> 
<a name="221" href="#221">221</a>         <a href="../../../../../org/apache/mina/filter/reqres/RequestResponseFilter.html">TimeoutTask</a> timeoutTask = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/mina/filter/reqres/RequestResponseFilter.html">TimeoutTask</a>(
<a name="222" href="#222">222</a>                 nextFilter, request, session);
<a name="223" href="#223">223</a> 
<a name="224" href="#224">224</a>         <em class="jxr_comment">// Schedule the timeout task.</em>
<a name="225" href="#225">225</a>         ScheduledFuture&lt;?&gt; timeoutFuture = timeoutScheduler.schedule(
<a name="226" href="#226">226</a>                 timeoutTask, request.getTimeoutMillis(),
<a name="227" href="#227">227</a>                 TimeUnit.MILLISECONDS);
<a name="228" href="#228">228</a>         request.setTimeoutTask(timeoutTask);
<a name="229" href="#229">229</a>         request.setTimeoutFuture(timeoutFuture);
<a name="230" href="#230">230</a> 
<a name="231" href="#231">231</a>         <em class="jxr_comment">// Add the timeout task to the unfinished task set.</em>
<a name="232" href="#232">232</a>         Set&lt;Request&gt; unrespondedRequests = getUnrespondedRequestStore(session);
<a name="233" href="#233">233</a>         <strong class="jxr_keyword">synchronized</strong> (unrespondedRequests) {
<a name="234" href="#234">234</a>             unrespondedRequests.add(request);
<a name="235" href="#235">235</a>         }
<a name="236" href="#236">236</a> 
<a name="237" href="#237">237</a>         <strong class="jxr_keyword">return</strong> request.getMessage();
<a name="238" href="#238">238</a>     }
<a name="239" href="#239">239</a> 
<a name="240" href="#240">240</a>     @Override
<a name="241" href="#241">241</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> sessionClosed(<a href="../../../../../org/apache/mina/common/IoFilter.html">NextFilter</a> nextFilter, <a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session)
<a name="242" href="#242">242</a>             <strong class="jxr_keyword">throws</strong> Exception {
<a name="243" href="#243">243</a>         <em class="jxr_comment">// Copy the unfinished task set to avoid unnecessary lock acquisition.</em>
<a name="244" href="#244">244</a>         <em class="jxr_comment">// Copying will be cheap because there won't be that many requests queued.</em>
<a name="245" href="#245">245</a>         Set&lt;Request&gt; unrespondedRequests = getUnrespondedRequestStore(session);
<a name="246" href="#246">246</a>         List&lt;Request&gt; unrespondedRequestsCopy;
<a name="247" href="#247">247</a>         <strong class="jxr_keyword">synchronized</strong> (unrespondedRequests) {
<a name="248" href="#248">248</a>             unrespondedRequestsCopy = <strong class="jxr_keyword">new</strong> ArrayList&lt;Request&gt;(
<a name="249" href="#249">249</a>                     unrespondedRequests);
<a name="250" href="#250">250</a>             unrespondedRequests.clear();