defaultiofuture.html

MINA+API 关于MINA的API

<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">finally</strong> {
<a name="155" href="#155">155</a>                 waiters--;
<a name="156" href="#156">156</a>                 <strong class="jxr_keyword">if</strong> (!ready) {
<a name="157" href="#157">157</a>                     checkDeadLock();
<a name="158" href="#158">158</a>                 }
<a name="159" href="#159">159</a>             }
<a name="160" href="#160">160</a>         }
<a name="161" href="#161">161</a>     }
<a name="162" href="#162">162</a> 
<a name="163" href="#163">163</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> checkDeadLock() {
<a name="164" href="#164">164</a>         <em class="jxr_comment">// Only read / write / connect / write future can cause dead lock. </em>
<a name="165" href="#165">165</a>         <strong class="jxr_keyword">if</strong> (!(<strong class="jxr_keyword">this</strong> instanceof CloseFuture || <strong class="jxr_keyword">this</strong> instanceof WriteFuture ||
<a name="166" href="#166">166</a>               <strong class="jxr_keyword">this</strong> instanceof <a href="../../../../org/apache/mina/common/ReadFuture.html">ReadFuture</a> || <strong class="jxr_keyword">this</strong> instanceof <a href="../../../../org/apache/mina/common/ConnectFuture.html">ConnectFuture</a>)) {
<a name="167" href="#167">167</a>             <strong class="jxr_keyword">return</strong>;
<a name="168" href="#168">168</a>         }
<a name="169" href="#169">169</a>         
<a name="170" href="#170">170</a>         IllegalStateException e = <strong class="jxr_keyword">new</strong> IllegalStateException(
<a name="171" href="#171">171</a>                 <span class="jxr_string">"DEAD LOCK: "</span> + IoFuture.<strong class="jxr_keyword">class</strong>.getSimpleName() +
<a name="172" href="#172">172</a>                 <span class="jxr_string">".await() was invoked from an I/O processor thread.  "</span> +
<a name="173" href="#173">173</a>                 <span class="jxr_string">"Please use "</span> + IoFutureListener.<strong class="jxr_keyword">class</strong>.getSimpleName() +
<a name="174" href="#174">174</a>                 <span class="jxr_string">" or configure a proper thread model alternatively."</span>);
<a name="175" href="#175">175</a> 
<a name="176" href="#176">176</a>         StackTraceElement[] stackTrace = e.getStackTrace();
<a name="177" href="#177">177</a> 
<a name="178" href="#178">178</a>         <em class="jxr_comment">// Simple and quick check.</em>
<a name="179" href="#179">179</a>         <strong class="jxr_keyword">for</strong> (StackTraceElement s: stackTrace) {
<a name="180" href="#180">180</a>             <strong class="jxr_keyword">if</strong> (AbstractPollingIoProcessor.<strong class="jxr_keyword">class</strong>.getName().equals(s.getClassName())) {
<a name="181" href="#181">181</a>                 <strong class="jxr_keyword">throw</strong> e;
<a name="182" href="#182">182</a>             }
<a name="183" href="#183">183</a>         }
<a name="184" href="#184">184</a> 
<a name="185" href="#185">185</a>         <em class="jxr_comment">// And then more precisely.</em>
<a name="186" href="#186">186</a>         <strong class="jxr_keyword">for</strong> (StackTraceElement s: stackTrace) {
<a name="187" href="#187">187</a>             <strong class="jxr_keyword">try</strong> {
<a name="188" href="#188">188</a>                 Class&lt;?&gt; cls = DefaultIoFuture.<strong class="jxr_keyword">class</strong>.getClassLoader().loadClass(s.getClassName());
<a name="189" href="#189">189</a>                 <strong class="jxr_keyword">if</strong> (IoProcessor.<strong class="jxr_keyword">class</strong>.isAssignableFrom(cls)) {
<a name="190" href="#190">190</a>                     <strong class="jxr_keyword">throw</strong> e;
<a name="191" href="#191">191</a>                 }
<a name="192" href="#192">192</a>             } <strong class="jxr_keyword">catch</strong> (Exception cnfe) {
<a name="193" href="#193">193</a>                 <em class="jxr_comment">// Ignore</em>
<a name="194" href="#194">194</a>             }
<a name="195" href="#195">195</a>         }
<a name="196" href="#196">196</a>     }
<a name="197" href="#197">197</a> 
<a name="198" href="#198">198</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isReady() {
<a name="199" href="#199">199</a>         <strong class="jxr_keyword">synchronized</strong> (lock) {
<a name="200" href="#200">200</a>             <strong class="jxr_keyword">return</strong> ready;
<a name="201" href="#201">201</a>         }
<a name="202" href="#202">202</a>     }
<a name="203" href="#203">203</a> 
<a name="204" href="#204">204</a>     <em class="jxr_javadoccomment">/**</em>
<a name="205" href="#205">205</a> <em class="jxr_javadoccomment">     * Sets the result of the asynchronous operation, and mark it as finished.</em>
<a name="206" href="#206">206</a> <em class="jxr_javadoccomment">     */</em>
<a name="207" href="#207">207</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> setValue(Object newValue) {
<a name="208" href="#208">208</a>         <strong class="jxr_keyword">synchronized</strong> (lock) {
<a name="209" href="#209">209</a>             <em class="jxr_comment">// Allow only once.</em>
<a name="210" href="#210">210</a>             <strong class="jxr_keyword">if</strong> (ready) {
<a name="211" href="#211">211</a>                 <strong class="jxr_keyword">return</strong>;
<a name="212" href="#212">212</a>             }
<a name="213" href="#213">213</a> 
<a name="214" href="#214">214</a>             result = newValue;
<a name="215" href="#215">215</a>             ready = <strong class="jxr_keyword">true</strong>;
<a name="216" href="#216">216</a>             <strong class="jxr_keyword">if</strong> (waiters &gt; 0) {
<a name="217" href="#217">217</a>                 lock.notifyAll();
<a name="218" href="#218">218</a>             }
<a name="219" href="#219">219</a>         }
<a name="220" href="#220">220</a> 
<a name="221" href="#221">221</a>         notifyListeners();
<a name="222" href="#222">222</a>     }
<a name="223" href="#223">223</a> 
<a name="224" href="#224">224</a>     <em class="jxr_javadoccomment">/**</em>
<a name="225" href="#225">225</a> <em class="jxr_javadoccomment">     * Returns the result of the asynchronous operation.</em>
<a name="226" href="#226">226</a> <em class="jxr_javadoccomment">     */</em>
<a name="227" href="#227">227</a>     <strong class="jxr_keyword">protected</strong> Object getValue() {
<a name="228" href="#228">228</a>         <strong class="jxr_keyword">synchronized</strong> (lock) {
<a name="229" href="#229">229</a>             <strong class="jxr_keyword">return</strong> result;
<a name="230" href="#230">230</a>         }
<a name="231" href="#231">231</a>     }
<a name="232" href="#232">232</a> 
<a name="233" href="#233">233</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/mina/common/IoFuture.html">IoFuture</a> addListener(IoFutureListener&lt;?&gt; listener) {
<a name="234" href="#234">234</a>         <strong class="jxr_keyword">if</strong> (listener == <strong class="jxr_keyword">null</strong>) {
<a name="235" href="#235">235</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> NullPointerException(<span class="jxr_string">"listener"</span>);
<a name="236" href="#236">236</a>         }
<a name="237" href="#237">237</a> 
<a name="238" href="#238">238</a>         <strong class="jxr_keyword">boolean</strong> notifyNow = false;
<a name="239" href="#239">239</a>         <strong class="jxr_keyword">synchronized</strong> (lock) {
<a name="240" href="#240">240</a>             <strong class="jxr_keyword">if</strong> (ready) {
<a name="241" href="#241">241</a>                 notifyNow = <strong class="jxr_keyword">true</strong>;
<a name="242" href="#242">242</a>             } <strong class="jxr_keyword">else</strong> {
<a name="243" href="#243">243</a>                 <strong class="jxr_keyword">if</strong> (firstListener == <strong class="jxr_keyword">null</strong>) {
<a name="244" href="#244">244</a>                     firstListener = listener;
<a name="245" href="#245">245</a>                 } <strong class="jxr_keyword">else</strong> {
<a name="246" href="#246">246</a>                     <strong class="jxr_keyword">if</strong> (otherListeners == <strong class="jxr_keyword">null</strong>) {
<a name="247" href="#247">247</a>                         otherListeners = <strong class="jxr_keyword">new</strong> ArrayList&lt;IoFutureListener&lt;?&gt;&gt;(1);
<a name="248" href="#248">248</a>                     }
<a name="249" href="#249">249</a>                     otherListeners.add(listener);
<a name="250" href="#250">250</a>                 }
<a name="251" href="#251">251</a>             }
<a name="252" href="#252">252</a>         }
<a name="253" href="#253">253</a> 
<a name="254" href="#254">254</a>         <strong class="jxr_keyword">if</strong> (notifyNow) {
<a name="255" href="#255">255</a>             notifyListener(listener);
<a name="256" href="#256">256</a>         }
<a name="257" href="#257">257</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>;
<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">public</strong> <a href="../../../../org/apache/mina/common/IoFuture.html">IoFuture</a> removeListener(IoFutureListener&lt;?&gt; listener) {
<a name="261" href="#261">261</a>         <strong class="jxr_keyword">if</strong> (listener == <strong class="jxr_keyword">null</strong>) {
<a name="262" href="#262">262</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> NullPointerException(<span class="jxr_string">"listener"</span>);
<a name="263" href="#263">263</a>         }
<a name="264" href="#264">264</a> 
<a name="265" href="#265">265</a>         <strong class="jxr_keyword">synchronized</strong> (lock) {
<a name="266" href="#266">266</a>             <strong class="jxr_keyword">if</strong> (!ready) {
<a name="267" href="#267">267</a>                 <strong class="jxr_keyword">if</strong> (listener == firstListener) {
<a name="268" href="#268">268</a>                     <strong class="jxr_keyword">if</strong> (otherListeners != <strong class="jxr_keyword">null</strong> &amp;&amp; !otherListeners.isEmpty()) {
<a name="269" href="#269">269</a>                         firstListener = otherListeners.remove(0);
<a name="270" href="#270">270</a>                     } <strong class="jxr_keyword">else</strong> {
<a name="271" href="#271">271</a>                         firstListener = <strong class="jxr_keyword">null</strong>;
<a name="272" href="#272">272</a>                     }
<a name="273" href="#273">273</a>                 } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (otherListeners != <strong class="jxr_keyword">null</strong>) {
<a name="274" href="#274">274</a>                     otherListeners.remove(listener);
<a name="275" href="#275">275</a>                 }
<a name="276" href="#276">276</a>             }
<a name="277" href="#277">277</a>         }
<a name="278" href="#278">278</a> 
<a name="279" href="#279">279</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>;
<a name="280" href="#280">280</a>     }
<a name="281" href="#281">281</a> 
<a name="282" href="#282">282</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> notifyListeners() {
<a name="283" href="#283">283</a>         <em class="jxr_comment">// There won't be any visibility problem or concurrent modification</em>
<a name="284" href="#284">284</a>         <em class="jxr_comment">// because 'ready' flag will be checked against both addListener and</em>
<a name="285" href="#285">285</a>         <em class="jxr_comment">// removeListener calls.</em>
<a name="286" href="#286">286</a>         <strong class="jxr_keyword">if</strong> (firstListener != <strong class="jxr_keyword">null</strong>) {
<a name="287" href="#287">287</a>             notifyListener(firstListener);
<a name="288" href="#288">288</a>             firstListener = <strong class="jxr_keyword">null</strong>;
<a name="289" href="#289">289</a> 
<a name="290" href="#290">290</a>             <strong class="jxr_keyword">if</strong> (otherListeners != <strong class="jxr_keyword">null</strong>) {
<a name="291" href="#291">291</a>                 <strong class="jxr_keyword">for</strong> (IoFutureListener&lt;?&gt; l : otherListeners) {
<a name="292" href="#292">292</a>                     notifyListener(l);
<a name="293" href="#293">293</a>                 }
<a name="294" href="#294">294</a>                 otherListeners = <strong class="jxr_keyword">null</strong>;
<a name="295" href="#295">295</a>             }
<a name="296" href="#296">296</a>         }
<a name="297" href="#297">297</a>     }
<a name="298" href="#298">298</a> 
<a name="299" href="#299">299</a>     @SuppressWarnings(<span class="jxr_string">"unchecked"</span>)
<a name="300" href="#300">300</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> notifyListener(<a href="../../../../org/apache/mina/common/IoFutureListener.html">IoFutureListener</a> l) {
<a name="301" href="#301">301</a>         <strong class="jxr_keyword">try</strong> {
<a name="302" href="#302">302</a>             l.operationComplete(<strong class="jxr_keyword">this</strong>);
<a name="303" href="#303">303</a>         } <strong class="jxr_keyword">catch</strong> (Throwable t) {
<a name="304" href="#304">304</a>             ExceptionMonitor.getInstance().exceptionCaught(t);
<a name="305" href="#305">305</a>         }
<a name="306" href="#306">306</a>     }
<a name="307" href="#307">307</a> }
</pre>
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