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<!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>ToePool xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> Copyright (C) 2003 Internet Archive.</em></em><a name="2" href="#2">2</a> <em class="comment"> *</em><a name="3" href="#3">3</a> <em class="comment"> * This file is part of the Heritrix web crawler (crawler.archive.org).</em><a name="4" href="#4">4</a> <em class="comment"> *</em><a name="5" href="#5">5</a> <em class="comment"> * Heritrix is free software; you can redistribute it and/or modify</em><a name="6" href="#6">6</a> <em class="comment"> * it under the terms of the GNU Lesser Public License as published by</em><a name="7" href="#7">7</a> <em class="comment"> * the Free Software Foundation; either version 2.1 of the License, or</em><a name="8" href="#8">8</a> <em class="comment"> * any later version.</em><a name="9" href="#9">9</a> <em class="comment"> *</em><a name="10" href="#10">10</a> <em class="comment"> * Heritrix is distributed in the hope that it will be useful,</em><a name="11" href="#11">11</a> <em class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</em><a name="12" href="#12">12</a> <em class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</em><a name="13" href="#13">13</a> <em class="comment"> * GNU Lesser Public License for more details.</em><a name="14" href="#14">14</a> <em class="comment"> *</em><a name="15" href="#15">15</a> <em class="comment"> * You should have received a copy of the GNU Lesser Public License</em><a name="16" href="#16">16</a> <em class="comment"> * along with Heritrix; if not, write to the Free Software</em><a name="17" href="#17">17</a> <em class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</em><a name="18" href="#18">18</a> <em class="comment"> *</em><a name="19" href="#19">19</a> <em class="comment"> * ToePool.java</em><a name="20" href="#20">20</a> <em class="comment"> * Created on Oct 1, 2003</em><a name="21" href="#21">21</a> <em class="comment"> *</em><a name="22" href="#22">22</a> <em class="comment"> * $Header: /cvsroot/archive-crawler/ArchiveOpenCrawler/src/java/org/archive/crawler/framework/ToePool.java,v 1.31 2005/11/10 01:10:02 stack-sf Exp $</em><a name="23" href="#23">23</a> <em class="comment"> */</em><a name="24" href="#24">24</a> <strong>package</strong> <a href="../../../../org/archive/crawler/framework/package-summary.html">org.archive.crawler.framework</a>;<a name="25" href="#25">25</a> <a name="26" href="#26">26</a> <strong>import</strong> java.io.PrintWriter;<a name="27" href="#27">27</a> <strong>import</strong> java.util.Date;<a name="28" href="#28">28</a> <strong>import</strong> java.util.Iterator;<a name="29" href="#29">29</a> <strong>import</strong> java.util.TreeSet;<a name="30" href="#30">30</a> <a name="31" href="#31">31</a> <strong>import</strong> org.archive.util.ArchiveUtils;<a name="32" href="#32">32</a> <strong>import</strong> org.archive.util.Histotable;<a name="33" href="#33">33</a> <strong>import</strong> org.archive.util.Reporter;<a name="34" href="#34">34</a> <a name="35" href="#35">35</a> <em>/**<em>*</em></em><a name="36" href="#36">36</a> <em> * A collection of ToeThreads. The class manages the ToeThreads currently</em><a name="37" href="#37">37</a> <em> * running. Including increasing and decreasing their number, keeping track</em><a name="38" href="#38">38</a> <em> * of their state and it can be used to kill hung threads.</em><a name="39" href="#39">39</a> <em> *</em><a name="40" href="#40">40</a> <em> * @author Gordon Mohr</em><a name="41" href="#41">41</a> <em> * @author Kristinn Sigurdsson</em><a name="42" href="#42">42</a> <em> *</em><a name="43" href="#43">43</a> <em> * @see org.archive.crawler.framework.ToeThread</em><a name="44" href="#44">44</a> <em> */</em><a name="45" href="#45">45</a> <strong>public</strong> <strong>class</strong> <a href="../../../../org/archive/crawler/framework/ToePool.html">ToePool</a> <strong>extends</strong> ThreadGroup implements <a href="../../../../org/archive/util/Reporter.html">Reporter</a> {<a name="46" href="#46">46</a> <em>/**<em>* run worker thread slightly lower than usual */</em></em><a name="47" href="#47">47</a> <strong>public</strong> <strong>static</strong> <strong>int</strong> DEFAULT_TOE_PRIORITY = Thread.NORM_PRIORITY - 1;<a name="48" href="#48">48</a> <a name="49" href="#49">49</a> <strong>protected</strong> <a href="../../../../org/archive/crawler/framework/CrawlController.html">CrawlController</a> controller;<a name="50" href="#50">50</a> <strong>protected</strong> <strong>int</strong> nextSerialNumber = 1;<a name="51" href="#51">51</a> <strong>protected</strong> <strong>int</strong> targetSize = 0; <a name="52" href="#52">52</a> <a name="53" href="#53">53</a> <em>/**<em>*</em></em><a name="54" href="#54">54</a> <em> * Constructor. Creates a pool of ToeThreads. </em><a name="55" href="#55">55</a> <em> *</em><a name="56" href="#56">56</a> <em> * @param c A reference to the CrawlController for the current crawl.</em><a name="57" href="#57">57</a> <em> */</em><a name="58" href="#58">58</a> <strong>public</strong> <a href="../../../../org/archive/crawler/framework/ToePool.html">ToePool</a>(<a href="../../../../org/archive/crawler/framework/CrawlController.html">CrawlController</a> c) {<a name="59" href="#59">59</a> <strong>super</strong>(<span class="string">"ToeThreads"</span>);<a name="60" href="#60">60</a> <strong>this</strong>.controller = c;<a name="61" href="#61">61</a> }<a name="62" href="#62">62</a> <a name="63" href="#63">63</a> <strong>public</strong> <strong>void</strong> cleanup() {<a name="64" href="#64">64</a> <strong>this</strong>.controller = <strong>null</strong>;<a name="65" href="#65">65</a> }<a name="66" href="#66">66</a> <a name="67" href="#67">67</a> <em>/**<em>*</em></em><a name="68" href="#68">68</a> <em> * @return The number of ToeThreads that are not available (Approximation).</em><a name="69" href="#69">69</a> <em> */</em><a name="70" href="#70">70</a> <strong>public</strong> <strong>int</strong> getActiveToeCount() {<a name="71" href="#71">71</a> Thread[] toes = getToes();<a name="72" href="#72">72</a> <strong>int</strong> count = 0;<a name="73" href="#73">73</a> <strong>for</strong> (<strong>int</strong> i = 0; i < toes.length; i++) {<a name="74" href="#74">74</a> <strong>if</strong>((toes[i] instanceof ToeThread) &&<a name="75" href="#75">75</a> ((<a href="../../../../org/archive/crawler/framework/ToeThread.html">ToeThread</a>)toes[i]).isActive()) {<a name="76" href="#76">76</a> count++;<a name="77" href="#77">77</a> }<a name="78" href="#78">78</a> }<a name="79" href="#79">79</a> <strong>return</strong> count; <a name="80" href="#80">80</a> }<a name="81" href="#81">81</a> <a name="82" href="#82">82</a> <em>/**<em>*</em></em><a name="83" href="#83">83</a> <em> * @return The number of ToeThreads. This may include killed ToeThreads</em><a name="84" href="#84">84</a> <em> * that were not replaced.</em><a name="85" href="#85">85</a> <em> */</em><a name="86" href="#86">86</a> <strong>public</strong> <strong>int</strong> getToeCount() {<a name="87" href="#87">87</a> Thread[] toes = getToes();<a name="88" href="#88">88</a> <strong>int</strong> count = 0;<a name="89" href="#89">89</a> <strong>for</strong> (<strong>int</strong> i = 0; i<toes.length; i++) {<a name="90" href="#90">90</a> <strong>if</strong>((toes[i] instanceof ToeThread)) {<a name="91" href="#91">91</a> count++;<a name="92" href="#92">92</a> }<a name="93" href="#93">93</a> }<a name="94" href="#94">94</a> <strong>return</strong> count; <a name="95" href="#95">95</a> }<a name="96" href="#96">96</a> <a name="97" href="#97">97</a> <strong>private</strong> Thread[] getToes() {<a name="98" href="#98">98</a> Thread[] toes = <strong>new</strong> Thread[activeCount()+10];<a name="99" href="#99">99</a> <strong>this</strong>.enumerate(toes);<a name="100" href="#100">100</a> <strong>return</strong> toes;<a name="101" href="#101">101</a> }<a name="102" href="#102">102</a> <a name="103" href="#103">103</a> <em>/**<em>*</em></em><a name="104" href="#104">104</a> <em> * Change the number of ToeThreads.</em><a name="105" href="#105">105</a> <em> *</em><a name="106" href="#106">106</a> <em> * @param newsize The new number of ToeThreads.</em><a name="107" href="#107">107</a> <em> */</em><a name="108" href="#108">108</a> <strong>public</strong> <strong>void</strong> setSize(<strong>int</strong> newsize)<a name="109" href="#109">109</a> {<a name="110" href="#110">110</a> targetSize = newsize;<a name="111" href="#111">111</a> <strong>int</strong> difference = newsize - getToeCount(); <a name="112" href="#112">112</a> <strong>if</strong> (d<strong>if</strong>ference > 0) {<a name="113" href="#113">113</a> <em class="comment">// must create threads</em><a name="114" href="#114">114</a> <strong>for</strong>(<strong>int</strong> i = 1; i <= difference; i++) {<a name="115" href="#115">115</a> startNewThread();<a name="116" href="#116">116</a> }<a name="117" href="#117">117</a> } <strong>else</strong> {<a name="118" href="#118">118</a> <em class="comment">// must retire extra threads</em><a name="119" href="#119">119</a> <strong>int</strong> retainedToes = targetSize; <a name="120" href="#120">120</a> Thread[] toes = <strong>this</strong>.getToes();<a name="121" href="#121">121</a> <strong>for</strong> (<strong>int</strong> i = 0; i < toes.length ; i++) {<a name="122" href="#122">122</a> <strong>if</strong>(!(toes[i] instanceof <a href="../../../../org/archive/crawler/framework/ToeThread.html">ToeThread</a>)) {<a name="123" href="#123">123</a> <strong>continue</strong>;<a name="124" href="#124">124</a> }<a name="125" href="#125">125</a> retainedToes--;<a name="126" href="#126">126</a> <strong>if</strong> (retainedToes>=0) {<a name="127" href="#127">127</a> <strong>continue</strong>; <em class="comment">// this toe is spared</em><a name="128" href="#128">128</a> }<a name="129" href="#129">129</a> <em class="comment">// otherwise:</em><a name="130" href="#130">130</a> <a href="../../../../org/archive/crawler/framework/ToeThread.html">ToeThread</a> tt = (ToeThread)toes[i];<a name="131" href="#131">131</a> tt.retire();<a name="132" href="#132">132</a> }<a name="133" href="#133">133</a> }<a name="134" href="#134">134</a> }<a name="135" href="#135">135</a> <a name="136" href="#136">136</a> <em>/**<em>*</em></em><a name="137" href="#137">137</a> <em> * Kills specified thread. Killed thread can be optionally replaced with a</em><a name="138" href="#138">138</a> <em> * new thread.</em><a name="139" href="#139">139</a> <em> *</em><a name="140" href="#140">140</a> <em> * <p><b>WARNING:</b> This operation should be used with great care. It may</em><a name="141" href="#141">141</a> <em> * destabilize the crawler.</em><a name="142" href="#142">142</a> <em> *</em><a name="143" href="#143">143</a> <em> * @param threadNumber Thread to kill</em><a name="144" href="#144">144</a> <em> * @param replace If true then a new thread will be created to take the</em><a name="145" href="#145">145</a> <em> * killed threads place. Otherwise the total number of threads</em><a name="146" href="#146">146</a> <em> * will decrease by one.</em><a name="147" href="#147">147</a> <em> */</em><a name="148" href="#148">148</a> <strong>public</strong> <strong>void</strong> killThread(<strong>int</strong> threadNumber, <strong>boolean</strong> replace){<a name="149" href="#149">149</a> ⌨️ 快捷键说明
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