Google Git
Sign in
apache / mina-site / refs/heads/mina-gen-docs / . / 0.7.4 / xref / org / apache / mina / util / BaseThreadPool.html
blob: 0f55b15c2cbfeb78c4a1ff840680be04a10917db [file] [log] [blame]
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1" /><title>BaseThreadPool xref</title>
<link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" />
</head>
<body>
<div id="overview"><a href="../../../../../apidocs/org/apache/mina/util/BaseThreadPool.html">View Javadoc</a></div><pre>
<a name="1" href="#1">1</a> <em class="comment">/*</em>
<a name="2" href="#2">2</a> <em class="comment"> * @(#) $Id: BaseThreadPool.java 264677 2005-08-30 02:44:35Z trustin $</em>
<a name="3" href="#3">3</a> <em class="comment"> *</em>
<a name="4" href="#4">4</a> <em class="comment"> * Copyright 2004 The Apache Software Foundation</em>
<a name="5" href="#5">5</a> <em class="comment"> *</em>
<a name="6" href="#6">6</a> <em class="comment"> * Licensed under the Apache License, Version 2.0 (the "License");</em>
<a name="7" href="#7">7</a> <em class="comment"> * you may not use this file except in compliance with the License.</em>
<a name="8" href="#8">8</a> <em class="comment"> * You may obtain a copy of the License at</em>
<a name="9" href="#9">9</a> <em class="comment"> *</em>
<a name="10" href="#10">10</a> <em class="comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a name="11" href="#11">11</a> <em class="comment"> *</em>
<a name="12" href="#12">12</a> <em class="comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a name="13" href="#13">13</a> <em class="comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a name="14" href="#14">14</a> <em class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a name="15" href="#15">15</a> <em class="comment"> * See the License for the specific language governing permissions and</em>
<a name="16" href="#16">16</a> <em class="comment"> * limitations under the License.</em>
<a name="17" href="#17">17</a> <em class="comment"> *</em>
<a name="18" href="#18">18</a> <em class="comment"> */</em>
<a name="19" href="#19">19</a> <strong>package</strong> <a href="../../../../org/apache/mina/util/package-summary.html">org.apache.mina.util</a>;
<a name="20" href="#20">20</a>
<a name="21" href="#21">21</a> <strong>import</strong> java.util.HashSet;
<a name="22" href="#22">22</a> <strong>import</strong> java.util.IdentityHashMap;
<a name="23" href="#23">23</a> <strong>import</strong> java.util.Iterator;
<a name="24" href="#24">24</a> <strong>import</strong> java.util.Map;
<a name="25" href="#25">25</a> <strong>import</strong> java.util.Set;
<a name="26" href="#26">26</a>
<a name="27" href="#27">27</a> <strong>import</strong> org.apache.mina.common.Session;
<a name="28" href="#28">28</a>
<a name="29" href="#29">29</a> <em>/**<em>*</em></em>
<a name="30" href="#30">30</a> <em> * A base implementation of Thread-pooling filters.</em>
<a name="31" href="#31">31</a> <em> * This filter forwards events to its thread pool. This is an implementation of</em>
<a name="32" href="#32">32</a> <em> * &lt;a href="<a href="http://deuce.doc.wustl.edu/doc/pspdfs/lf.pdf" target="alexandria_uri">http://deuce.doc.wustl.edu/doc/pspdfs/lf.pdf</a>">Leader/Followers</em>
<a name="33" href="#33">33</a> <em> * thread pool&lt;/a> by Douglas C. Schmidt et al.</em>
<a name="34" href="#34">34</a> <em> * </em>
<a name="35" href="#35">35</a> <em> * @author Trustin Lee (trustin@apache.org)</em>
<a name="36" href="#36">36</a> <em> * @version $Rev: 264677 $, $Date: 2005-08-30 11:44:35 +0900 $</em>
<a name="37" href="#37">37</a> <em> */</em>
<a name="38" href="#38">38</a> <strong>public</strong> <strong>abstract</strong> <strong>class</strong> <a href="../../../../org/apache/mina/util/BaseThreadPool.html">BaseThreadPool</a> implements <a href="../../../../org/apache/mina/util/ThreadPool.html">ThreadPool</a>
<a name="39" href="#39">39</a> {
<a name="40" href="#40">40</a> <em>/**<em>*</em></em>
<a name="41" href="#41">41</a> <em> * Default maximum size of thread pool (2G).</em>
<a name="42" href="#42">42</a> <em> */</em>
<a name="43" href="#43">43</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> DEFAULT_MAXIMUM_POOL_SIZE = Integer.MAX_VALUE;
<a name="44" href="#44">44</a>
<a name="45" href="#45">45</a> <em>/**<em>*</em></em>
<a name="46" href="#46">46</a> <em> * Default keep-alive time of thread pool (1 min).</em>
<a name="47" href="#47">47</a> <em> */</em>
<a name="48" href="#48">48</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> DEFAULT_KEEP_ALIVE_TIME = 60 * 1000;
<a name="49" href="#49">49</a>
<a name="50" href="#50">50</a> <em>/**<em>*</em></em>
<a name="51" href="#51">51</a> <em> * A queue which contains {@link Integer}s which represents reusable</em>
<a name="52" href="#52">52</a> <em> * thread IDs. {@link Worker} first checks this queue and then</em>
<a name="53" href="#53">53</a> <em> * uses {@link #threadId} when no reusable thread ID is available.</em>
<a name="54" href="#54">54</a> <em> */</em>
<a name="55" href="#55">55</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> <a href="../../../../org/apache/mina/util/Queue.html">Queue</a> threadIdReuseQueue = <strong>new</strong> <a href="../../../../org/apache/mina/util/Queue.html">Queue</a>();
<a name="56" href="#56">56</a> <strong>private</strong> <strong>static</strong> <strong>int</strong> threadId = 0;
<a name="57" href="#57">57</a>
<a name="58" href="#58">58</a> <strong>private</strong> <strong>static</strong> <strong>int</strong> acquireThreadId()
<a name="59" href="#59">59</a> {
<a name="60" href="#60">60</a> <strong>synchronized</strong>( threadIdReuseQueue )
<a name="61" href="#61">61</a> {
<a name="62" href="#62">62</a> Integer id = ( Integer ) threadIdReuseQueue.pop();
<a name="63" href="#63">63</a> <strong>if</strong>( id == <strong>null</strong> )
<a name="64" href="#64">64</a> {
<a name="65" href="#65">65</a> <strong>return</strong> ++ threadId;
<a name="66" href="#66">66</a> }
<a name="67" href="#67">67</a> <strong>else</strong>
<a name="68" href="#68">68</a> {
<a name="69" href="#69">69</a> <strong>return</strong> id.intValue();
<a name="70" href="#70">70</a> }
<a name="71" href="#71">71</a> }
<a name="72" href="#72">72</a> }
<a name="73" href="#73">73</a>
<a name="74" href="#74">74</a> <strong>private</strong> <strong>static</strong> <strong>void</strong> releaseThreadId( <strong>int</strong> id )
<a name="75" href="#75">75</a> {
<a name="76" href="#76">76</a> <strong>synchronized</strong>( threadIdReuseQueue )
<a name="77" href="#77">77</a> {
<a name="78" href="#78">78</a> threadIdReuseQueue.push( <strong>new</strong> Integer( id ) );
<a name="79" href="#79">79</a> }
<a name="80" href="#80">80</a> }
<a name="81" href="#81">81</a>
<a name="82" href="#82">82</a> <strong>private</strong> <strong>final</strong> String threadNamePrefix;
<a name="83" href="#83">83</a> <strong>private</strong> <strong>final</strong> Map buffers = <strong>new</strong> IdentityHashMap();
<a name="84" href="#84">84</a> <strong>private</strong> <strong>final</strong> <a href="../../../../org/apache/mina/util/Stack.html">Stack</a> followers = <strong>new</strong> <a href="../../../../org/apache/mina/util/Stack.html">Stack</a>();
<a name="85" href="#85">85</a> <strong>private</strong> <strong>final</strong> <a href="../../../../org/apache/mina/util/BlockingSet.html">BlockingSet</a> readySessionBuffers = <strong>new</strong> <a href="../../../../org/apache/mina/util/BlockingSet.html">BlockingSet</a>();
<a name="86" href="#86">86</a> <strong>private</strong> <strong>final</strong> Set busySessionBuffers = <strong>new</strong> HashSet();
<a name="87" href="#87">87</a>
<a name="88" href="#88">88</a> <strong>private</strong> Worker leader;
<a name="89" href="#89">89</a>
<a name="90" href="#90">90</a> <strong>private</strong> <strong>int</strong> maximumPoolSize = DEFAULT_MAXIMUM_POOL_SIZE;
<a name="91" href="#91">91</a> <strong>private</strong> <strong>int</strong> keepAliveTime = DEFAULT_KEEP_ALIVE_TIME;
<a name="92" href="#92">92</a>
<a name="93" href="#93">93</a> <strong>private</strong> <strong>boolean</strong> started;
<a name="94" href="#94">94</a> <strong>private</strong> <strong>boolean</strong> shuttingDown;
<a name="95" href="#95">95</a>
<a name="96" href="#96">96</a> <strong>private</strong> <strong>int</strong> poolSize;
<a name="97" href="#97">97</a> <strong>private</strong> <strong>final</strong> Object poolSizeLock = <strong>new</strong> Object();
<a name="98" href="#98">98</a>
<a name="99" href="#99">99</a> <em>/**<em>*</em></em>
<a name="100" href="#100">100</a> <em> * Creates a new instance with default thread pool settings.</em>
<a name="101" href="#101">101</a> <em> * You'll have to invoke {@link #start()} method to start threads actually.</em>
<a name="102" href="#102">102</a> <em> *</em>
<a name="103" href="#103">103</a> <em> * @param threadNamePrefix the prefix of the thread names this pool will create.</em>
<a name="104" href="#104">104</a> <em> */</em>
<a name="105" href="#105">105</a> <strong>public</strong> <a href="../../../../org/apache/mina/util/BaseThreadPool.html">BaseThreadPool</a>( String threadNamePrefix )
<a name="106" href="#106">106</a> {
<a name="107" href="#107">107</a> <strong>if</strong>( threadNamePrefix == <strong>null</strong> )
<a name="108" href="#108">108</a> {
<a name="109" href="#109">109</a> <strong>throw</strong> <strong>new</strong> NullPointerException( <span class="string">"threadNamePrefix"</span> );
<a name="110" href="#110">110</a> }
<a name="111" href="#111">111</a> threadNamePrefix = threadNamePrefix.trim();
<a name="112" href="#112">112</a> <strong>if</strong>( threadNamePrefix.length() == 0 )
<a name="113" href="#113">113</a> {
<a name="114" href="#114">114</a> <strong>throw</strong> <strong>new</strong> IllegalArgumentException( <span class="string">"threadNamePrefix is empty."</span> );
<a name="115" href="#115">115</a> }
<a name="116" href="#116">116</a> <strong>this</strong>.threadNamePrefix = threadNamePrefix;
<a name="117" href="#117">117</a> }
<a name="118" href="#118">118</a>
<a name="119" href="#119">119</a> <strong>public</strong> String getThreadNamePrefix()
<a name="120" href="#120">120</a> {
<a name="121" href="#121">121</a> <strong>return</strong> threadNamePrefix;
<a name="122" href="#122">122</a> }
<a name="123" href="#123">123</a>
<a name="124" href="#124">124</a> <strong>public</strong> <strong>int</strong> getPoolSize()
<a name="125" href="#125">125</a> {
<a name="126" href="#126">126</a> <strong>synchronized</strong>( poolSizeLock )
<a name="127" href="#127">127</a> {
<a name="128" href="#128">128</a> <strong>return</strong> poolSize;
<a name="129" href="#129">129</a> }
<a name="130" href="#130">130</a> }
<a name="131" href="#131">131</a>
<a name="132" href="#132">132</a> <strong>public</strong> <strong>int</strong> getMaximumPoolSize()
<a name="133" href="#133">133</a> {
<a name="134" href="#134">134</a> <strong>return</strong> maximumPoolSize;
<a name="135" href="#135">135</a> }
<a name="136" href="#136">136</a>
<a name="137" href="#137">137</a> <strong>public</strong> <strong>int</strong> getKeepAliveTime()
<a name="138" href="#138">138</a> {
<a name="139" href="#139">139</a> <strong>return</strong> keepAliveTime;
<a name="140" href="#140">140</a> }
<a name="141" href="#141">141</a>
<a name="142" href="#142">142</a> <strong>public</strong> <strong>void</strong> setMaximumPoolSize( <strong>int</strong> maximumPoolSize )
<a name="143" href="#143">143</a> {
<a name="144" href="#144">144</a> <strong>if</strong>( maximumPoolSize &lt;= 0 )
<a name="145" href="#145">145</a> <strong>throw</strong> <strong>new</strong> IllegalArgumentException();
<a name="146" href="#146">146</a> <strong>this</strong>.maximumPoolSize = maximumPoolSize;
<a name="147" href="#147">147</a> }
<a name="148" href="#148">148</a>
<a name="149" href="#149">149</a> <strong>public</strong> <strong>void</strong> setKeepAliveTime( <strong>int</strong> keepAliveTime )
<a name="150" href="#150">150</a> {
<a name="151" href="#151">151</a> <strong>this</strong>.keepAliveTime = keepAliveTime;
<a name="152" href="#152">152</a> }
<a name="153" href="#153">153</a>
<a name="154" href="#154">154</a> <strong>public</strong> <strong>synchronized</strong> <strong>void</strong> start()
<a name="155" href="#155">155</a> {
<a name="156" href="#156">156</a> <strong>if</strong>( started )
<a name="157" href="#157">157</a> <strong>return</strong>;
<a name="158" href="#158">158</a>
<a name="159" href="#159">159</a> shuttingDown = false;
<a name="160" href="#160">160</a>
<a name="161" href="#161">161</a> leader = <strong>new</strong> Worker();
<a name="162" href="#162">162</a> leader.start();
<a name="163" href="#163">163</a> leader.lead();
<a name="164" href="#164">164</a>
<a name="165" href="#165">165</a> started = <strong>true</strong>;
<a name="166" href="#166">166</a> }
<a name="167" href="#167">167</a>
<a name="168" href="#168">168</a> <strong>public</strong> <strong>synchronized</strong> <strong>void</strong> stop()
<a name="169" href="#169">169</a> {
<a name="170" href="#170">170</a> <strong>if</strong>( !started )
<a name="171" href="#171">171</a> <strong>return</strong>;
<a name="172" href="#172">172</a>
<a name="173" href="#173">173</a> shuttingDown = <strong>true</strong>;
<a name="174" href="#174">174</a> Worker lastLeader = <strong>null</strong>;
<a name="175" href="#175">175</a> <strong>for</strong>( ;; )
<a name="176" href="#176">176</a> {
<a name="177" href="#177">177</a> Worker leader = <strong>this</strong>.leader;
<a name="178" href="#178">178</a> <strong>if</strong>( lastLeader == leader )
<a name="179" href="#179">179</a> <strong>break</strong>;
<a name="180" href="#180">180</a>
<a name="181" href="#181">181</a> <strong>while</strong>( leader.isAlive() )
<a name="182" href="#182">182</a> {
<a name="183" href="#183">183</a> leader.interrupt();
<a name="184" href="#184">184</a> <strong>try</strong>
<a name="185" href="#185">185</a> {
<a name="186" href="#186">186</a> leader.join();
<a name="187" href="#187">187</a> }
<a name="188" href="#188">188</a> <strong>catch</strong>( InterruptedException e )
<a name="189" href="#189">189</a> {
<a name="190" href="#190">190</a> }
<a name="191" href="#191">191</a> }
<a name="192" href="#192">192</a>
<a name="193" href="#193">193</a> lastLeader = leader;
<a name="194" href="#194">194</a> }
<a name="195" href="#195">195</a>
<a name="196" href="#196">196</a> started = false;
<a name="197" href="#197">197</a> }
<a name="198" href="#198">198</a>
<a name="199" href="#199">199</a> <strong>private</strong> <strong>void</strong> increasePoolSize()
<a name="200" href="#200">200</a> {
<a name="201" href="#201">201</a> <strong>synchronized</strong>( poolSizeLock )
<a name="202" href="#202">202</a> {
<a name="203" href="#203">203</a> poolSize++;
<a name="204" href="#204">204</a> }
<a name="205" href="#205">205</a> }
<a name="206" href="#206">206</a>
<a name="207" href="#207">207</a> <strong>private</strong> <strong>void</strong> decreasePoolSize()
<a name="208" href="#208">208</a> {
<a name="209" href="#209">209</a> <strong>synchronized</strong>( poolSizeLock )
<a name="210" href="#210">210</a> {
<a name="211" href="#211">211</a> poolSize--;
<a name="212" href="#212">212</a> }
<a name="213" href="#213">213</a> }
<a name="214" href="#214">214</a>
<a name="215" href="#215">215</a> <strong>protected</strong> <strong>void</strong> fireEvent( Object nextFilter, Session session,
<a name="216" href="#216">216</a> <a href="../../../../org/apache/mina/util/EventType.html">EventType</a> type, Object data )
<a name="217" href="#217">217</a> {
<a name="218" href="#218">218</a> <strong>final</strong> <a href="../../../../org/apache/mina/util/BlockingSet.html">BlockingSet</a> readySessionBuffers = <strong>this</strong>.readySessionBuffers;
<a name="219" href="#219">219</a> <strong>final</strong> Set busySessionBuffers = <strong>this</strong>.busySessionBuffers;
<a name="220" href="#220">220</a> <strong>final</strong> <a href="../../../../org/apache/mina/util/Event.html">Event</a> event = <strong>new</strong> <a href="../../../../org/apache/mina/util/Event.html">Event</a>( type, nextFilter, data );
<a name="221" href="#221">221</a>
<a name="222" href="#222">222</a> <strong>synchronized</strong>( readySessionBuffers )
<a name="223" href="#223">223</a> {
<a name="224" href="#224">224</a> <strong>final</strong> SessionBuffer buf = getSessionBuffer( session );
<a name="225" href="#225">225</a> <strong>final</strong> <a href="../../../../org/apache/mina/util/Queue.html">Queue</a> eventQueue = buf.eventQueue;
<a name="226" href="#226">226</a>
<a name="227" href="#227">227</a> <strong>synchronized</strong>( buf )
<a name="228" href="#228">228</a> {
<a name="229" href="#229">229</a> eventQueue.push( event );
<a name="230" href="#230">230</a> }
<a name="231" href="#231">231</a>
<a name="232" href="#232">232</a> <strong>if</strong>( !busySessionBuffers.contains( buf ) )
<a name="233" href="#233">233</a> {
<a name="234" href="#234">234</a> busySessionBuffers.add( buf );
<a name="235" href="#235">235</a> readySessionBuffers.add( buf );
<a name="236" href="#236">236</a> }
<a name="237" href="#237">237</a> }
<a name="238" href="#238">238</a> }
<a name="239" href="#239">239</a>
<a name="240" href="#240">240</a> <em>/**<em>*</em></em>
<a name="241" href="#241">241</a> <em> * Implement this method to forward events to &lt;tt>nextFilter&lt;/tt>.</em>
<a name="242" href="#242">242</a> <em> */</em>
<a name="243" href="#243">243</a> <strong>protected</strong> <strong>abstract</strong> <strong>void</strong> processEvent( Object nextFilter, Session session,
<a name="244" href="#244">244</a> <a href="../../../../org/apache/mina/util/EventType.html">EventType</a> type, Object data );
<a name="245" href="#245">245</a>
<a name="246" href="#246">246</a> <strong>private</strong> SessionBuffer getSessionBuffer( Session session )
<a name="247" href="#247">247</a> {
<a name="248" href="#248">248</a> <strong>final</strong> Map buffers = <strong>this</strong>.buffers;
<a name="249" href="#249">249</a> SessionBuffer buf = ( SessionBuffer ) buffers.get( session );
<a name="250" href="#250">250</a> <strong>if</strong>( buf == <strong>null</strong> )
<a name="251" href="#251">251</a> {
<a name="252" href="#252">252</a> <strong>synchronized</strong>( buffers )
<a name="253" href="#253">253</a> {
<a name="254" href="#254">254</a> buf = ( SessionBuffer ) buffers.get( session );
<a name="255" href="#255">255</a> <strong>if</strong>( buf == <strong>null</strong> )
<a name="256" href="#256">256</a> {
<a name="257" href="#257">257</a> buf = <strong>new</strong> SessionBuffer( session );
<a name="258" href="#258">258</a> buffers.put( session, buf );
<a name="259" href="#259">259</a> }
<a name="260" href="#260">260</a> }
<a name="261" href="#261">261</a> }
<a name="262" href="#262">262</a> <strong>return</strong> buf;
<a name="263" href="#263">263</a> }
<a name="264" href="#264">264</a>
<a name="265" href="#265">265</a> <strong>private</strong> <strong>void</strong> removeSessionBuffer( SessionBuffer buf )
<a name="266" href="#266">266</a> {
<a name="267" href="#267">267</a> <strong>final</strong> Map buffers = <strong>this</strong>.buffers;
<a name="268" href="#268">268</a> <strong>final</strong> <a href="../../../../org/apache/mina/common/Session.html">Session</a> session = buf.session;
<a name="269" href="#269">269</a> <strong>synchronized</strong>( buffers )
<a name="270" href="#270">270</a> {
<a name="271" href="#271">271</a> buffers.remove( session );
<a name="272" href="#272">272</a> }
<a name="273" href="#273">273</a> }
<a name="274" href="#274">274</a>
<a name="275" href="#275">275</a> <strong>private</strong> <strong>static</strong> <strong>class</strong> SessionBuffer
<a name="276" href="#276">276</a> {
<a name="277" href="#277">277</a> <strong>private</strong> <strong>final</strong> <a href="../../../../org/apache/mina/common/Session.html">Session</a> session;
<a name="278" href="#278">278</a>
<a name="279" href="#279">279</a> <strong>private</strong> <strong>final</strong> <a href="../../../../org/apache/mina/util/Queue.html">Queue</a> eventQueue = <strong>new</strong> <a href="../../../../org/apache/mina/util/Queue.html">Queue</a>();
<a name="280" href="#280">280</a>
<a name="281" href="#281">281</a> <strong>private</strong> SessionBuffer( Session session )
<a name="282" href="#282">282</a> {
<a name="283" href="#283">283</a> <strong>this</strong>.session = session;
<a name="284" href="#284">284</a> }
<a name="285" href="#285">285</a> }
<a name="286" href="#286">286</a>
<a name="287" href="#287">287</a> <strong>private</strong> <strong>class</strong> Worker <strong>extends</strong> Thread
<a name="288" href="#288">288</a> {
<a name="289" href="#289">289</a> <strong>private</strong> <strong>final</strong> <strong>int</strong> id;
<a name="290" href="#290">290</a> <strong>private</strong> <strong>final</strong> Object promotionLock = <strong>new</strong> Object();
<a name="291" href="#291">291</a> <strong>private</strong> <strong>boolean</strong> dead;
<a name="292" href="#292">292</a>
<a name="293" href="#293">293</a> <strong>private</strong> Worker()
<a name="294" href="#294">294</a> {
<a name="295" href="#295">295</a> <strong>int</strong> id = acquireThreadId();
<a name="296" href="#296">296</a> <strong>this</strong>.id = id;
<a name="297" href="#297">297</a> <strong>this</strong>.setName( threadNamePrefix + '-' + id );
<a name="298" href="#298">298</a> increasePoolSize();
<a name="299" href="#299">299</a> }
<a name="300" href="#300">300</a>
<a name="301" href="#301">301</a> <strong>public</strong> <strong>boolean</strong> lead()
<a name="302" href="#302">302</a> {
<a name="303" href="#303">303</a> <strong>final</strong> Object promotionLock = <strong>this</strong>.promotionLock;
<a name="304" href="#304">304</a> <strong>synchronized</strong>( promotionLock )
<a name="305" href="#305">305</a> {
<a name="306" href="#306">306</a> <strong>if</strong>( dead )
<a name="307" href="#307">307</a> {
<a name="308" href="#308">308</a> <strong>return</strong> false;
<a name="309" href="#309">309</a> }
<a name="310" href="#310">310</a>
<a name="311" href="#311">311</a> leader = <strong>this</strong>;
<a name="312" href="#312">312</a> promotionLock.notify();
<a name="313" href="#313">313</a> }
<a name="314" href="#314">314</a>
<a name="315" href="#315">315</a> <strong>return</strong> <strong>true</strong>;
<a name="316" href="#316">316</a> }
<a name="317" href="#317">317</a>
<a name="318" href="#318">318</a> <strong>public</strong> <strong>void</strong> run()
<a name="319" href="#319">319</a> {
<a name="320" href="#320">320</a> <strong>for</strong>( ;; )
<a name="321" href="#321">321</a> {
<a name="322" href="#322">322</a> <strong>if</strong>( !waitForPromotion() )
<a name="323" href="#323">323</a> <strong>break</strong>;
<a name="324" href="#324">324</a>
<a name="325" href="#325">325</a> SessionBuffer buf = fetchBuffer();
<a name="326" href="#326">326</a> giveUpLead();
<a name="327" href="#327">327</a>
<a name="328" href="#328">328</a> <strong>if</strong>( buf == <strong>null</strong> )
<a name="329" href="#329">329</a> {
<a name="330" href="#330">330</a> <strong>break</strong>;
<a name="331" href="#331">331</a> }
<a name="332" href="#332">332</a>
<a name="333" href="#333">333</a> processEvents( buf );
<a name="334" href="#334">334</a> follow();
<a name="335" href="#335">335</a> releaseBuffer( buf );
<a name="336" href="#336">336</a> }
<a name="337" href="#337">337</a>
<a name="338" href="#338">338</a> decreasePoolSize();
<a name="339" href="#339">339</a> releaseThreadId( id );
<a name="340" href="#340">340</a> }
<a name="341" href="#341">341</a>
<a name="342" href="#342">342</a> <strong>private</strong> SessionBuffer fetchBuffer()
<a name="343" href="#343">343</a> {
<a name="344" href="#344">344</a> SessionBuffer buf;
<a name="345" href="#345">345</a> <a href="../../../../org/apache/mina/util/BlockingSet.html">BlockingSet</a> readySessionBuffers = BaseThreadPool.<strong>this</strong>.readySessionBuffers;
<a name="346" href="#346">346</a> <strong>synchronized</strong>( readySessionBuffers )
<a name="347" href="#347">347</a> {
<a name="348" href="#348">348</a> <strong>for</strong>( ;; )
<a name="349" href="#349">349</a> {
<a name="350" href="#350">350</a> <strong>try</strong>
<a name="351" href="#351">351</a> {
<a name="352" href="#352">352</a> readySessionBuffers.waitForNewItem();
<a name="353" href="#353">353</a> }
<a name="354" href="#354">354</a> <strong>catch</strong>( InterruptedException e )
<a name="355" href="#355">355</a> {
<a name="356" href="#356">356</a> <strong>if</strong>( shuttingDown )
<a name="357" href="#357">357</a> {
<a name="358" href="#358">358</a> <strong>return</strong> <strong>null</strong>;
<a name="359" href="#359">359</a> }
<a name="360" href="#360">360</a> <strong>else</strong>
<a name="361" href="#361">361</a> {
<a name="362" href="#362">362</a> <strong>continue</strong>;
<a name="363" href="#363">363</a> }
<a name="364" href="#364">364</a> }
<a name="365" href="#365">365</a>
<a name="366" href="#366">366</a> Iterator it = readySessionBuffers.iterator();
<a name="367" href="#367">367</a> <strong>while</strong>( it.hasNext() )
<a name="368" href="#368">368</a> {
<a name="369" href="#369">369</a> buf = ( SessionBuffer ) it.next();
<a name="370" href="#370">370</a> it.remove();
<a name="371" href="#371">371</a> <strong>if</strong>( buf != <strong>null</strong> &amp;&amp; !buf.eventQueue.isEmpty() )
<a name="372" href="#372">372</a> {
<a name="373" href="#373">373</a> <strong>return</strong> buf;
<a name="374" href="#374">374</a> }
<a name="375" href="#375">375</a> }
<a name="376" href="#376">376</a> }
<a name="377" href="#377">377</a> }
<a name="378" href="#378">378</a> }
<a name="379" href="#379">379</a>
<a name="380" href="#380">380</a> <strong>private</strong> <strong>void</strong> processEvents( SessionBuffer buf )
<a name="381" href="#381">381</a> {
<a name="382" href="#382">382</a> <strong>final</strong> <a href="../../../../org/apache/mina/common/Session.html">Session</a> session = buf.session;
<a name="383" href="#383">383</a> <strong>final</strong> <a href="../../../../org/apache/mina/util/Queue.html">Queue</a> eventQueue = buf.eventQueue;
<a name="384" href="#384">384</a> <strong>for</strong>( ;; )
<a name="385" href="#385">385</a> {
<a name="386" href="#386">386</a> <a href="../../../../org/apache/mina/util/Event.html">Event</a> event;
<a name="387" href="#387">387</a> <strong>synchronized</strong>( buf )
<a name="388" href="#388">388</a> {
<a name="389" href="#389">389</a> event = ( Event ) eventQueue.pop();
<a name="390" href="#390">390</a> <strong>if</strong>( event == <strong>null</strong> )
<a name="391" href="#391">391</a> <strong>break</strong>;
<a name="392" href="#392">392</a> }
<a name="393" href="#393">393</a> processEvent( event.getNextFilter(), session,
<a name="394" href="#394">394</a> event.getType(), event.getData() );
<a name="395" href="#395">395</a> }
<a name="396" href="#396">396</a> }
<a name="397" href="#397">397</a>
<a name="398" href="#398">398</a> <strong>private</strong> <strong>void</strong> follow()
<a name="399" href="#399">399</a> {
<a name="400" href="#400">400</a> <strong>final</strong> Object promotionLock = <strong>this</strong>.promotionLock;
<a name="401" href="#401">401</a> <strong>final</strong> <a href="../../../../org/apache/mina/util/Stack.html">Stack</a> followers = BaseThreadPool.<strong>this</strong>.followers;
<a name="402" href="#402">402</a> <strong>synchronized</strong>( promotionLock )
<a name="403" href="#403">403</a> {
<a name="404" href="#404">404</a> <strong>if</strong>( <strong>this</strong> != leader )
<a name="405" href="#405">405</a> {
<a name="406" href="#406">406</a> <strong>synchronized</strong>( followers )
<a name="407" href="#407">407</a> {
<a name="408" href="#408">408</a> followers.push( <strong>this</strong> );
<a name="409" href="#409">409</a> }
<a name="410" href="#410">410</a> }
<a name="411" href="#411">411</a> }
<a name="412" href="#412">412</a> }
<a name="413" href="#413">413</a>
<a name="414" href="#414">414</a> <strong>private</strong> <strong>void</strong> releaseBuffer( SessionBuffer buf )
<a name="415" href="#415">415</a> {
<a name="416" href="#416">416</a> <strong>final</strong> <a href="../../../../org/apache/mina/util/BlockingSet.html">BlockingSet</a> readySessionBuffers = BaseThreadPool.<strong>this</strong>.readySessionBuffers;
<a name="417" href="#417">417</a> <strong>final</strong> Set busySessionBuffers = BaseThreadPool.<strong>this</strong>.busySessionBuffers;
<a name="418" href="#418">418</a> <strong>final</strong> <a href="../../../../org/apache/mina/util/Queue.html">Queue</a> eventQueue = buf.eventQueue;
<a name="419" href="#419">419</a>
<a name="420" href="#420">420</a> <strong>synchronized</strong>( readySessionBuffers )
<a name="421" href="#421">421</a> {
<a name="422" href="#422">422</a> <strong>if</strong>( eventQueue.isEmpty() )
<a name="423" href="#423">423</a> {
<a name="424" href="#424">424</a> busySessionBuffers.remove( buf );
<a name="425" href="#425">425</a> removeSessionBuffer( buf );
<a name="426" href="#426">426</a> }
<a name="427" href="#427">427</a> <strong>else</strong>
<a name="428" href="#428">428</a> {
<a name="429" href="#429">429</a> readySessionBuffers.add( buf );
<a name="430" href="#430">430</a> }
<a name="431" href="#431">431</a> }
<a name="432" href="#432">432</a> }
<a name="433" href="#433">433</a>
<a name="434" href="#434">434</a> <strong>private</strong> <strong>boolean</strong> waitForPromotion()
<a name="435" href="#435">435</a> {
<a name="436" href="#436">436</a> <strong>final</strong> Object promotionLock = <strong>this</strong>.promotionLock;
<a name="437" href="#437">437</a>
<a name="438" href="#438">438</a> <strong>final</strong> <strong>long</strong> startTime = System.currentTimeMillis();
<a name="439" href="#439">439</a> <strong>long</strong> currentTime = startTime;
<a name="440" href="#440">440</a>
<a name="441" href="#441">441</a> <strong>synchronized</strong>( promotionLock )
<a name="442" href="#442">442</a> {
<a name="443" href="#443">443</a> <strong>while</strong>( <strong>this</strong> != leader )
<a name="444" href="#444">444</a> {
<a name="445" href="#445">445</a> <em class="comment">// Calculate remaining keep-alive time</em>
<a name="446" href="#446">446</a> <strong>int</strong> keepAliveTime = getKeepAliveTime();
<a name="447" href="#447">447</a> <strong>if</strong>( keepAliveTime > 0 )
<a name="448" href="#448">448</a> {
<a name="449" href="#449">449</a> keepAliveTime -= ( currentTime - startTime );
<a name="450" href="#450">450</a> }
<a name="451" href="#451">451</a> <strong>else</strong>
<a name="452" href="#452">452</a> {
<a name="453" href="#453">453</a> keepAliveTime = Integer.MAX_VALUE;
<a name="454" href="#454">454</a> }
<a name="455" href="#455">455</a>
<a name="456" href="#456">456</a> <em class="comment">// Break the loop if there's no remaining keep-alive time.</em>
<a name="457" href="#457">457</a> <strong>if</strong>( keepAliveTime &lt;= 0 )
<a name="458" href="#458">458</a> {
<a name="459" href="#459">459</a> <strong>break</strong>;
<a name="460" href="#460">460</a> }
<a name="461" href="#461">461</a>
<a name="462" href="#462">462</a> <em class="comment">// Wait for promotion</em>
<a name="463" href="#463">463</a> <strong>try</strong>
<a name="464" href="#464">464</a> {
<a name="465" href="#465">465</a> promotionLock.wait( keepAliveTime );
<a name="466" href="#466">466</a> }
<a name="467" href="#467">467</a> <strong>catch</strong>( InterruptedException e )
<a name="468" href="#468">468</a> {
<a name="469" href="#469">469</a> }
<a name="470" href="#470">470</a>
<a name="471" href="#471">471</a> <em class="comment">// Update currentTime for the next iteration</em>
<a name="472" href="#472">472</a> currentTime = System.currentTimeMillis();
<a name="473" href="#473">473</a> }
<a name="474" href="#474">474</a>
<a name="475" href="#475">475</a> <strong>boolean</strong> timeToLead = <strong>this</strong> == leader;
<a name="476" href="#476">476</a>
<a name="477" href="#477">477</a> <strong>if</strong>( !timeToLead )
<a name="478" href="#478">478</a> {
<a name="479" href="#479">479</a> <em class="comment">// time to die</em>
<a name="480" href="#480">480</a> <strong>synchronized</strong>( followers )
<a name="481" href="#481">481</a> {
<a name="482" href="#482">482</a> followers.remove( <strong>this</strong> );
<a name="483" href="#483">483</a> }
<a name="484" href="#484">484</a>
<a name="485" href="#485">485</a> <em class="comment">// Mark as dead explicitly when we've got promotionLock.</em>
<a name="486" href="#486">486</a> dead = <strong>true</strong>;
<a name="487" href="#487">487</a> }
<a name="488" href="#488">488</a>
<a name="489" href="#489">489</a> <strong>return</strong> timeToLead;
<a name="490" href="#490">490</a> }
<a name="491" href="#491">491</a> }
<a name="492" href="#492">492</a>
<a name="493" href="#493">493</a> <strong>private</strong> <strong>void</strong> giveUpLead()
<a name="494" href="#494">494</a> {
<a name="495" href="#495">495</a> <strong>final</strong> <a href="../../../../org/apache/mina/util/Stack.html">Stack</a> followers = BaseThreadPool.<strong>this</strong>.followers;
<a name="496" href="#496">496</a> Worker worker;
<a name="497" href="#497">497</a> <strong>do</strong>
<a name="498" href="#498">498</a> {
<a name="499" href="#499">499</a> <strong>synchronized</strong>( followers )
<a name="500" href="#500">500</a> {
<a name="501" href="#501">501</a> worker = ( Worker ) followers.pop();
<a name="502" href="#502">502</a> }
<a name="503" href="#503">503</a>
<a name="504" href="#504">504</a> <strong>if</strong>( worker == <strong>null</strong> )
<a name="505" href="#505">505</a> {
<a name="506" href="#506">506</a> <em class="comment">// Increase the number of threads if we</em>
<a name="507" href="#507">507</a> <em class="comment">// are not shutting down and we can increase the number.</em>
<a name="508" href="#508">508</a> <strong>if</strong>( !shuttingDown
<a name="509" href="#509">509</a> &amp;&amp; getPoolSize() &lt; getMaximumPoolSize() )
<a name="510" href="#510">510</a> {
<a name="511" href="#511">511</a> worker = <strong>new</strong> Worker();
<a name="512" href="#512">512</a> worker.lead();
<a name="513" href="#513">513</a> worker.start();
<a name="514" href="#514">514</a> }
<a name="515" href="#515">515</a>
<a name="516" href="#516">516</a> <em class="comment">// This loop should end because:</em>
<a name="517" href="#517">517</a> <em class="comment">// 1) lead() is called already,</em>
<a name="518" href="#518">518</a> <em class="comment">// 2) or it is shutting down and there's no more threads left.</em>
<a name="519" href="#519">519</a> <strong>break</strong>;
<a name="520" href="#520">520</a> }
<a name="521" href="#521">521</a> }
<a name="522" href="#522">522</a> <strong>while</strong>( !worker.lead() );
<a name="523" href="#523">523</a> }
<a name="524" href="#524">524</a> }
<a name="525" href="#525">525</a> }
</pre>
<hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body>
</html>