trafficshapingfilter.html

MINA+API 关于MINA的API

<a name="140" href="#140">140</a>         
<a name="141" href="#141">141</a>         <strong class="jxr_keyword">final</strong> <a href="../../../../../org/apache/mina/filter/traffic/ReadThrottleFilter.html">State</a> state = (State) session.getAttribute(STATE);
<a name="142" href="#142">142</a>         <strong class="jxr_keyword">long</strong> currentTime = System.currentTimeMillis();
<a name="143" href="#143">143</a>         
<a name="144" href="#144">144</a>         <strong class="jxr_keyword">long</strong> suspendTime = 0;
<a name="145" href="#145">145</a>         <strong class="jxr_keyword">boolean</strong> firstRead = false;
<a name="146" href="#146">146</a>         <strong class="jxr_keyword">synchronized</strong> (state) {
<a name="147" href="#147">147</a>             state.readBytes += messageSizeEstimator.estimateSize(message);
<a name="148" href="#148">148</a> 
<a name="149" href="#149">149</a>             <strong class="jxr_keyword">if</strong> (!state.suspendedRead) {
<a name="150" href="#150">150</a>                 <strong class="jxr_keyword">if</strong> (state.readStartTime == 0) {
<a name="151" href="#151">151</a>                     firstRead = <strong class="jxr_keyword">true</strong>;
<a name="152" href="#152">152</a>                     state.readStartTime = currentTime - 1000; 
<a name="153" href="#153">153</a>                 }
<a name="154" href="#154">154</a> 
<a name="155" href="#155">155</a>                 <strong class="jxr_keyword">long</strong> throughput = 
<a name="156" href="#156">156</a>                     (state.readBytes * 1000 / (currentTime - state.readStartTime));
<a name="157" href="#157">157</a>                 <strong class="jxr_keyword">if</strong> (throughput &gt;= maxReadThroughput) {
<a name="158" href="#158">158</a>                     suspendTime = Math.max(
<a name="159" href="#159">159</a>                             0,
<a name="160" href="#160">160</a>                             state.readBytes * 1000 / maxReadThroughput - 
<a name="161" href="#161">161</a>                             (firstRead? 0 : currentTime - state.readStartTime));
<a name="162" href="#162">162</a>                     
<a name="163" href="#163">163</a>                     state.readBytes = 0;
<a name="164" href="#164">164</a>                     state.readStartTime = 0;
<a name="165" href="#165">165</a>                     state.suspendedRead = suspendTime != 0;
<a name="166" href="#166">166</a> 
<a name="167" href="#167">167</a>                     adjustReadBufferSize(session);
<a name="168" href="#168">168</a>                 }
<a name="169" href="#169">169</a>             }
<a name="170" href="#170">170</a>         }
<a name="171" href="#171">171</a>         
<a name="172" href="#172">172</a>         <strong class="jxr_keyword">if</strong> (suspendTime != 0) {
<a name="173" href="#173">173</a>             session.suspendRead();
<a name="174" href="#174">174</a>             scheduledExecutor.schedule(<strong class="jxr_keyword">new</strong> Runnable() {
<a name="175" href="#175">175</a>                 <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> run() {
<a name="176" href="#176">176</a>                     <strong class="jxr_keyword">synchronized</strong> (state) {
<a name="177" href="#177">177</a>                         state.suspendedRead = false;
<a name="178" href="#178">178</a>                     }
<a name="179" href="#179">179</a>                     session.resumeRead();
<a name="180" href="#180">180</a>                 }
<a name="181" href="#181">181</a>             }, suspendTime, TimeUnit.MILLISECONDS);
<a name="182" href="#182">182</a>         }
<a name="183" href="#183">183</a>         
<a name="184" href="#184">184</a>         nextFilter.messageReceived(session, message);
<a name="185" href="#185">185</a>     }
<a name="186" href="#186">186</a> 
<a name="187" href="#187">187</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> adjustReadBufferSize(<a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session) {
<a name="188" href="#188">188</a>         <strong class="jxr_keyword">int</strong> maxReadThroughput = <strong class="jxr_keyword">this</strong>.maxReadThroughput;
<a name="189" href="#189">189</a>         <strong class="jxr_keyword">if</strong> (maxReadThroughput == 0) {
<a name="190" href="#190">190</a>             <strong class="jxr_keyword">return</strong>;
<a name="191" href="#191">191</a>         }
<a name="192" href="#192">192</a> 
<a name="193" href="#193">193</a>         <strong class="jxr_keyword">if</strong> (session.getConfig().getReadBufferSize() &gt; maxReadThroughput) {
<a name="194" href="#194">194</a>             session.getConfig().setReadBufferSize(maxReadThroughput);
<a name="195" href="#195">195</a>         }
<a name="196" href="#196">196</a>         <strong class="jxr_keyword">if</strong> (session.getConfig().getMaxReadBufferSize() &gt; maxReadThroughput) {
<a name="197" href="#197">197</a>             session.getConfig().setMaxReadBufferSize(maxReadThroughput);
<a name="198" href="#198">198</a>         }
<a name="199" href="#199">199</a>     }
<a name="200" href="#200">200</a> 
<a name="201" href="#201">201</a>     @Override
<a name="202" href="#202">202</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> messageSent(<a href="../../../../../org/apache/mina/common/IoFilter.html">NextFilter</a> nextFilter, <strong class="jxr_keyword">final</strong> <a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session,
<a name="203" href="#203">203</a>             <a href="../../../../../org/apache/mina/common/WriteRequest.html">WriteRequest</a> writeRequest) <strong class="jxr_keyword">throws</strong> Exception {
<a name="204" href="#204">204</a>         
<a name="205" href="#205">205</a>         <strong class="jxr_keyword">int</strong> maxWriteThroughput = <strong class="jxr_keyword">this</strong>.maxWriteThroughput;
<a name="206" href="#206">206</a>         <strong class="jxr_keyword">if</strong> (maxWriteThroughput == 0) {
<a name="207" href="#207">207</a>             nextFilter.messageSent(session, writeRequest);
<a name="208" href="#208">208</a>         }
<a name="209" href="#209">209</a>         
<a name="210" href="#210">210</a>         <strong class="jxr_keyword">final</strong> <a href="../../../../../org/apache/mina/filter/traffic/ReadThrottleFilter.html">State</a> state = (State) session.getAttribute(STATE);
<a name="211" href="#211">211</a>         <strong class="jxr_keyword">long</strong> currentTime = System.currentTimeMillis();
<a name="212" href="#212">212</a>         
<a name="213" href="#213">213</a>         <strong class="jxr_keyword">long</strong> suspendTime = 0;
<a name="214" href="#214">214</a>         <strong class="jxr_keyword">boolean</strong> firstWrite = false;
<a name="215" href="#215">215</a>         <strong class="jxr_keyword">synchronized</strong> (state) {
<a name="216" href="#216">216</a>             state.writtenBytes += messageSizeEstimator.estimateSize(writeRequest.getMessage());
<a name="217" href="#217">217</a>             <strong class="jxr_keyword">if</strong> (!state.suspendedWrite) {
<a name="218" href="#218">218</a>                 <strong class="jxr_keyword">if</strong> (state.writeStartTime == 0) {
<a name="219" href="#219">219</a>                     firstWrite = <strong class="jxr_keyword">true</strong>;
<a name="220" href="#220">220</a>                     state.writeStartTime = currentTime - 1000; 
<a name="221" href="#221">221</a>                 }
<a name="222" href="#222">222</a>                 
<a name="223" href="#223">223</a>                 <strong class="jxr_keyword">long</strong> throughput = 
<a name="224" href="#224">224</a>                     (state.writtenBytes * 1000 / (currentTime - state.writeStartTime));
<a name="225" href="#225">225</a>                 <strong class="jxr_keyword">if</strong> (throughput &gt;= maxWriteThroughput) {
<a name="226" href="#226">226</a>                     suspendTime = Math.max(
<a name="227" href="#227">227</a>                             0,
<a name="228" href="#228">228</a>                             state.writtenBytes * 1000 / maxWriteThroughput -
<a name="229" href="#229">229</a>                             (firstWrite? 0 : currentTime - state.writeStartTime));
<a name="230" href="#230">230</a>                     
<a name="231" href="#231">231</a>                     state.writtenBytes = 0;
<a name="232" href="#232">232</a>                     state.writeStartTime = 0;
<a name="233" href="#233">233</a>                     state.suspendedWrite = suspendTime != 0;
<a name="234" href="#234">234</a>                 }
<a name="235" href="#235">235</a>             }
<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">if</strong> (suspendTime != 0) {
<a name="239" href="#239">239</a>             session.suspendWrite();
<a name="240" href="#240">240</a>             scheduledExecutor.schedule(<strong class="jxr_keyword">new</strong> Runnable() {
<a name="241" href="#241">241</a>                 <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> run() {
<a name="242" href="#242">242</a>                     <strong class="jxr_keyword">synchronized</strong> (state) {
<a name="243" href="#243">243</a>                         state.suspendedWrite = false;
<a name="244" href="#244">244</a>                     }
<a name="245" href="#245">245</a>                     session.resumeWrite();
<a name="246" href="#246">246</a>                 }
<a name="247" href="#247">247</a>             }, suspendTime, TimeUnit.MILLISECONDS);
<a name="248" href="#248">248</a>         }
<a name="249" href="#249">249</a>         
<a name="250" href="#250">250</a>         nextFilter.messageSent(session, writeRequest);
<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> filterSetTrafficMask(<a href="../../../../../org/apache/mina/common/IoFilter.html">NextFilter</a> nextFilter, <a href="../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session,
<a name="255" href="#255">255</a>             <a href="../../../../../org/apache/mina/common/TrafficMask.html">TrafficMask</a> trafficMask) <strong class="jxr_keyword">throws</strong> Exception {
<a name="256" href="#256">256</a>         <a href="../../../../../org/apache/mina/filter/traffic/ReadThrottleFilter.html">State</a> state = (State) session.getAttribute(STATE);
<a name="257" href="#257">257</a>         <strong class="jxr_keyword">boolean</strong> suspendedRead;
<a name="258" href="#258">258</a>         <strong class="jxr_keyword">boolean</strong> suspendedWrite;
<a name="259" href="#259">259</a>         <strong class="jxr_keyword">synchronized</strong> (state) {
<a name="260" href="#260">260</a>             suspendedRead = state.suspendedRead;
<a name="261" href="#261">261</a>             suspendedWrite = state.suspendedWrite;
<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">if</strong> (suspendedRead) {
<a name="265" href="#265">265</a>             trafficMask = trafficMask.and(TrafficMask.WRITE);
<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">if</strong> (suspendedWrite) {
<a name="269" href="#269">269</a>             trafficMask = trafficMask.and(TrafficMask.READ);
<a name="270" href="#270">270</a>         }
<a name="271" href="#271">271</a>         
<a name="272" href="#272">272</a>         nextFilter.filterSetTrafficMask(session, trafficMask);
<a name="273" href="#273">273</a>     }
<a name="274" href="#274">274</a>     
<a name="275" href="#275">275</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/mina/filter/traffic/ReadThrottleFilter.html">State</a> {
<a name="276" href="#276">276</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">long</strong> readStartTime;
<a name="277" href="#277">277</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">long</strong> writeStartTime;
<a name="278" href="#278">278</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> suspendedRead;
<a name="279" href="#279">279</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> suspendedWrite;
<a name="280" href="#280">280</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">long</strong> readBytes;
<a name="281" href="#281">281</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">long</strong> writtenBytes;
<a name="282" href="#282">282</a>     }
<a name="283" href="#283">283</a> }
</pre>
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