cachedbufferallocator.html

MINA+API 关于MINA的API

<a name="141" href="#141">141</a>         <strong class="jxr_keyword">return</strong> poolMap;
<a name="142" href="#142">142</a>     }
<a name="143" href="#143">143</a> 
<a name="144" href="#144">144</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> allocate(<strong class="jxr_keyword">int</strong> requestedCapacity, <strong class="jxr_keyword">boolean</strong> direct) {
<a name="145" href="#145">145</a>         <strong class="jxr_keyword">int</strong> actualCapacity = IoBuffer.normalizeCapacity(requestedCapacity);
<a name="146" href="#146">146</a>         <a href="../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> buf ;
<a name="147" href="#147">147</a>         <strong class="jxr_keyword">if</strong> (maxCachedBufferSize != 0 &amp;&amp; actualCapacity &gt; maxCachedBufferSize) {
<a name="148" href="#148">148</a>             <strong class="jxr_keyword">if</strong> (direct) {
<a name="149" href="#149">149</a>                 buf = wrap(ByteBuffer.allocateDirect(actualCapacity));
<a name="150" href="#150">150</a>             } <strong class="jxr_keyword">else</strong> {
<a name="151" href="#151">151</a>                 buf = wrap(ByteBuffer.allocate(actualCapacity));
<a name="152" href="#152">152</a>             }
<a name="153" href="#153">153</a>         } <strong class="jxr_keyword">else</strong> {
<a name="154" href="#154">154</a>             Queue&lt;CachedBuffer&gt; pool;
<a name="155" href="#155">155</a>             <strong class="jxr_keyword">if</strong> (direct) {
<a name="156" href="#156">156</a>                 pool = directBuffers.get().get(actualCapacity);
<a name="157" href="#157">157</a>             } <strong class="jxr_keyword">else</strong> {
<a name="158" href="#158">158</a>                 pool = heapBuffers.get().get(actualCapacity);
<a name="159" href="#159">159</a>             }
<a name="160" href="#160">160</a>             
<a name="161" href="#161">161</a>             <em class="jxr_comment">// Recycle if possible.</em>
<a name="162" href="#162">162</a>             buf = pool.poll();
<a name="163" href="#163">163</a>             <strong class="jxr_keyword">if</strong> (buf != <strong class="jxr_keyword">null</strong>) {
<a name="164" href="#164">164</a>                 buf.clear();
<a name="165" href="#165">165</a>                 buf.setAutoExpand(false);
<a name="166" href="#166">166</a>                 buf.order(ByteOrder.BIG_ENDIAN);
<a name="167" href="#167">167</a>             } <strong class="jxr_keyword">else</strong> {
<a name="168" href="#168">168</a>                 <strong class="jxr_keyword">if</strong> (direct) {
<a name="169" href="#169">169</a>                     buf = wrap(ByteBuffer.allocateDirect(actualCapacity));
<a name="170" href="#170">170</a>                 } <strong class="jxr_keyword">else</strong> {
<a name="171" href="#171">171</a>                     buf = wrap(ByteBuffer.allocate(actualCapacity));
<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>         buf.limit(requestedCapacity);
<a name="177" href="#177">177</a>         <strong class="jxr_keyword">return</strong> buf;
<a name="178" href="#178">178</a>     }
<a name="179" href="#179">179</a>     
<a name="180" href="#180">180</a>     <strong class="jxr_keyword">public</strong> ByteBuffer allocateNioBuffer(<strong class="jxr_keyword">int</strong> capacity, <strong class="jxr_keyword">boolean</strong> direct) {
<a name="181" href="#181">181</a>         <strong class="jxr_keyword">return</strong> allocate(capacity, direct).buf();
<a name="182" href="#182">182</a>     }
<a name="183" href="#183">183</a>     
<a name="184" href="#184">184</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> wrap(ByteBuffer nioBuffer) {
<a name="185" href="#185">185</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/mina/common/CachedBufferAllocator.html">CachedBuffer</a>(nioBuffer);
<a name="186" href="#186">186</a>     }
<a name="187" href="#187">187</a> 
<a name="188" href="#188">188</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> dispose() {
<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">private</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/mina/common/CachedBufferAllocator.html">CachedBuffer</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../org/apache/mina/common/AbstractIoBuffer.html">AbstractIoBuffer</a> {
<a name="192" href="#192">192</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> Thread ownerThread;
<a name="193" href="#193">193</a>         <strong class="jxr_keyword">private</strong> ByteBuffer buf;
<a name="194" href="#194">194</a> 
<a name="195" href="#195">195</a>         <strong class="jxr_keyword">protected</strong> <a href="../../../../org/apache/mina/common/CachedBufferAllocator.html">CachedBuffer</a>(ByteBuffer buf) {
<a name="196" href="#196">196</a>             <strong class="jxr_keyword">super</strong>(CachedBufferAllocator.<strong class="jxr_keyword">this</strong>, buf.capacity());
<a name="197" href="#197">197</a>             <strong class="jxr_keyword">this</strong>.ownerThread = Thread.currentThread();
<a name="198" href="#198">198</a>             <strong class="jxr_keyword">this</strong>.buf = buf;
<a name="199" href="#199">199</a>             buf.order(ByteOrder.BIG_ENDIAN);
<a name="200" href="#200">200</a>         }
<a name="201" href="#201">201</a>         
<a name="202" href="#202">202</a>         <strong class="jxr_keyword">protected</strong> <a href="../../../../org/apache/mina/common/CachedBufferAllocator.html">CachedBuffer</a>(<a href="../../../../org/apache/mina/common/CachedBufferAllocator.html">CachedBuffer</a> parent, ByteBuffer buf) {
<a name="203" href="#203">203</a>             <strong class="jxr_keyword">super</strong>(parent);
<a name="204" href="#204">204</a>             <strong class="jxr_keyword">this</strong>.ownerThread = Thread.currentThread();
<a name="205" href="#205">205</a>             <strong class="jxr_keyword">this</strong>.buf = buf;
<a name="206" href="#206">206</a>         }
<a name="207" href="#207">207</a> 
<a name="208" href="#208">208</a>         @Override
<a name="209" href="#209">209</a>         <strong class="jxr_keyword">public</strong> ByteBuffer buf() {
<a name="210" href="#210">210</a>             <strong class="jxr_keyword">if</strong> (buf == <strong class="jxr_keyword">null</strong>) {
<a name="211" href="#211">211</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(<span class="jxr_string">"Buffer has been freed already."</span>);
<a name="212" href="#212">212</a>             }
<a name="213" href="#213">213</a>             <strong class="jxr_keyword">return</strong> buf;
<a name="214" href="#214">214</a>         }
<a name="215" href="#215">215</a>         
<a name="216" href="#216">216</a>         @Override
<a name="217" href="#217">217</a>         <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> buf(ByteBuffer buf) {
<a name="218" href="#218">218</a>             ByteBuffer oldBuf = <strong class="jxr_keyword">this</strong>.buf;
<a name="219" href="#219">219</a>             <strong class="jxr_keyword">this</strong>.buf = buf;
<a name="220" href="#220">220</a>             free(oldBuf);
<a name="221" href="#221">221</a>         }
<a name="222" href="#222">222</a> 
<a name="223" href="#223">223</a>         @Override
<a name="224" href="#224">224</a>         <strong class="jxr_keyword">protected</strong> <a href="../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> duplicate0() {
<a name="225" href="#225">225</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/mina/common/CachedBufferAllocator.html">CachedBuffer</a>(<strong class="jxr_keyword">this</strong>, buf().duplicate());
<a name="226" href="#226">226</a>         }
<a name="227" href="#227">227</a> 
<a name="228" href="#228">228</a>         @Override
<a name="229" href="#229">229</a>         <strong class="jxr_keyword">protected</strong> <a href="../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> slice0() {
<a name="230" href="#230">230</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/mina/common/CachedBufferAllocator.html">CachedBuffer</a>(<strong class="jxr_keyword">this</strong>, buf().slice());
<a name="231" href="#231">231</a>         }
<a name="232" href="#232">232</a> 
<a name="233" href="#233">233</a>         @Override
<a name="234" href="#234">234</a>         <strong class="jxr_keyword">protected</strong> <a href="../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> asReadOnlyBuffer0() {
<a name="235" href="#235">235</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/mina/common/CachedBufferAllocator.html">CachedBuffer</a>(<strong class="jxr_keyword">this</strong>, buf().asReadOnlyBuffer());
<a name="236" href="#236">236</a>         }
<a name="237" href="#237">237</a> 
<a name="238" href="#238">238</a>         @Override
<a name="239" href="#239">239</a>         <strong class="jxr_keyword">public</strong> byte[] array() {
<a name="240" href="#240">240</a>             <strong class="jxr_keyword">return</strong> buf().array();
<a name="241" href="#241">241</a>         }
<a name="242" href="#242">242</a> 
<a name="243" href="#243">243</a>         @Override
<a name="244" href="#244">244</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> arrayOffset() {
<a name="245" href="#245">245</a>             <strong class="jxr_keyword">return</strong> buf().arrayOffset();
<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">boolean</strong> hasArray() {
<a name="250" href="#250">250</a>             <strong class="jxr_keyword">return</strong> buf().hasArray();
<a name="251" href="#251">251</a>         }
<a name="252" href="#252">252</a> 
<a name="253" href="#253">253</a>         @Override
<a name="254" href="#254">254</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> free() {
<a name="255" href="#255">255</a>             free(buf);
<a name="256" href="#256">256</a>             buf = <strong class="jxr_keyword">null</strong>;
<a name="257" href="#257">257</a>         }
<a name="258" href="#258">258</a>         
<a name="259" href="#259">259</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> free(ByteBuffer oldBuf) {
<a name="260" href="#260">260</a>             <strong class="jxr_keyword">if</strong> (oldBuf == <strong class="jxr_keyword">null</strong> || oldBuf.capacity() &gt; maxCachedBufferSize ||
<a name="261" href="#261">261</a>                 oldBuf.isReadOnly() || isDerived() ||
<a name="262" href="#262">262</a>                 Thread.currentThread() != ownerThread) {
<a name="263" href="#263">263</a>                 <strong class="jxr_keyword">return</strong>;
<a name="264" href="#264">264</a>             }
<a name="265" href="#265">265</a> 
<a name="266" href="#266">266</a>             <em class="jxr_comment">// Add to the cache.</em>
<a name="267" href="#267">267</a>             Queue&lt;CachedBuffer&gt; pool;
<a name="268" href="#268">268</a>             <strong class="jxr_keyword">if</strong> (oldBuf.isDirect()) {
<a name="269" href="#269">269</a>                 pool = directBuffers.get().get(oldBuf.capacity());
<a name="270" href="#270">270</a>             } <strong class="jxr_keyword">else</strong> {
<a name="271" href="#271">271</a>                 pool = heapBuffers.get().get(oldBuf.capacity());
<a name="272" href="#272">272</a>             }
<a name="273" href="#273">273</a>             
<a name="274" href="#274">274</a>             <strong class="jxr_keyword">if</strong> (pool == <strong class="jxr_keyword">null</strong>) {
<a name="275" href="#275">275</a>                 <strong class="jxr_keyword">return</strong>;
<a name="276" href="#276">276</a>             }
<a name="277" href="#277">277</a> 
<a name="278" href="#278">278</a>             <em class="jxr_comment">// Restrict the size of the pool to prevent OOM.</em>
<a name="279" href="#279">279</a>             <strong class="jxr_keyword">if</strong> (maxPoolSize == 0 || pool.size() &lt; maxPoolSize) {
<a name="280" href="#280">280</a>                 pool.offer(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/mina/common/CachedBufferAllocator.html">CachedBuffer</a>(oldBuf));
<a name="281" href="#281">281</a>             }
<a name="282" href="#282">282</a>         }
<a name="283" href="#283">283</a>     }
<a name="284" href="#284">284</a> }
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