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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=UTF-8" /><title>BucketQueueAssignmentPolicy xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../apidocs/org/archive/crawler/frontier/BucketQueueAssignmentPolicy.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> BucketQueueAssignmentPolicy</em></em><a name="2" href="#2">2</a> <em class="comment"> * </em><a name="3" href="#3">3</a> <em class="comment"> * $Header$</em><a name="4" href="#4">4</a> <em class="comment"> * </em><a name="5" href="#5">5</a> <em class="comment"> * Created on May 06, 2005</em><a name="6" href="#6">6</a> <em class="comment"> *</em><a name="7" href="#7">7</a> <em class="comment"> * Copyright (C) 2005 Christian Kohlschuetter</em><a name="8" href="#8">8</a> <em class="comment"> *</em><a name="9" href="#9">9</a> <em class="comment"> * This file is part of the Heritrix web crawler (crawler.archive.org).</em><a name="10" href="#10">10</a> <em class="comment"> *</em><a name="11" href="#11">11</a> <em class="comment"> * Heritrix is free software; you can redistribute it and/or modify</em><a name="12" href="#12">12</a> <em class="comment"> * it under the terms of the GNU Lesser Public License as published by</em><a name="13" href="#13">13</a> <em class="comment"> * the Free Software Foundation; either version 2.1 of the License, or</em><a name="14" href="#14">14</a> <em class="comment"> * any later version.</em><a name="15" href="#15">15</a> <em class="comment"> *</em><a name="16" href="#16">16</a> <em class="comment"> * Heritrix is distributed in the hope that it will be useful,</em><a name="17" href="#17">17</a> <em class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</em><a name="18" href="#18">18</a> <em class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</em><a name="19" href="#19">19</a> <em class="comment"> * GNU Lesser Public License for more details.</em><a name="20" href="#20">20</a> <em class="comment"> *</em><a name="21" href="#21">21</a> <em class="comment"> * You should have received a copy of the GNU Lesser Public License</em><a name="22" href="#22">22</a> <em class="comment"> * along with Heritrix; if not, write to the Free Software</em><a name="23" href="#23">23</a> <em class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</em><a name="24" href="#24">24</a> <em class="comment"> *</em><a name="25" href="#25">25</a> <em class="comment"> */</em><a name="26" href="#26">26</a> <strong>package</strong> <a href="../../../../org/archive/crawler/frontier/package-summary.html">org.archive.crawler.frontier</a>;<a name="27" href="#27">27</a> <a name="28" href="#28">28</a> <strong>import</strong> org.apache.commons.httpclient.URIException;<a name="29" href="#29">29</a> <strong>import</strong> org.archive.crawler.datamodel.CandidateURI;<a name="30" href="#30">30</a> <strong>import</strong> org.archive.crawler.datamodel.CrawlHost;<a name="31" href="#31">31</a> <strong>import</strong> org.archive.crawler.framework.CrawlController;<a name="32" href="#32">32</a> <a name="33" href="#33">33</a> <em>/**<em>*</em></em><a name="34" href="#34">34</a> <em> * Uses the target IPs as basis for queue-assignment,</em><a name="35" href="#35">35</a> <em> * distributing them over a fixed number of sub-queues.</em><a name="36" href="#36">36</a> <em> * </em><a name="37" href="#37">37</a> <em> * @author Christian Kohlschuetter</em><a name="38" href="#38">38</a> <em> */</em><a name="39" href="#39">39</a> <strong>public</strong> <strong>class</strong> <a href="../../../../org/archive/crawler/frontier/BucketQueueAssignmentPolicy.html">BucketQueueAssignmentPolicy</a> <strong>extends</strong> <a href="../../../../org/archive/crawler/frontier/QueueAssignmentPolicy.html">QueueAssignmentPolicy</a> {<a name="40" href="#40">40</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> DEFAULT_NOIP_BITMASK = 1023;<a name="41" href="#41">41</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> DEFAULT_QUEUES_HOSTS_MODULO = 1021;<a name="42" href="#42">42</a> <a name="43" href="#43">43</a> <strong>public</strong> String getClassKey(<strong>final</strong> <a href="../../../../org/archive/crawler/framework/CrawlController.html">CrawlController</a> controller,<a name="44" href="#44">44</a> <strong>final</strong> <a href="../../../../org/archive/crawler/datamodel/CandidateURI.html">CandidateURI</a> curi) {<a name="45" href="#45">45</a> <a name="46" href="#46">46</a> <a href="../../../../org/archive/crawler/datamodel/CrawlHost.html">CrawlHost</a> host;<a name="47" href="#47">47</a> <strong>try</strong> {<a name="48" href="#48">48</a> host = controller.getServerCache().getHostFor(<a name="49" href="#49">49</a> curi.getUURI().getReferencedHost());<a name="50" href="#50">50</a> } <strong>catch</strong> (URIException e) {<a name="51" href="#51">51</a> <em class="comment">// FIXME error handling</em><a name="52" href="#52">52</a> e.printStackTrace();<a name="53" href="#53">53</a> host = <strong>null</strong>;<a name="54" href="#54">54</a> }<a name="55" href="#55">55</a> <strong>if</strong>(host == <strong>null</strong>) {<a name="56" href="#56">56</a> <strong>return</strong> <span class="string">"NO-HOST"</span>;<a name="57" href="#57">57</a> } <strong>else</strong> <strong>if</strong>(host.getIP() == <strong>null</strong>) {<a name="58" href="#58">58</a> <strong>return</strong> <span class="string">"NO-IP-"</span>.concat(Integer.toString(Math.abs(host.getHostName()<a name="59" href="#59">59</a> .hashCode())<a name="60" href="#60">60</a> & DEFAULT_NOIP_BITMASK));<a name="61" href="#61">61</a> } <strong>else</strong> {<a name="62" href="#62">62</a> <strong>return</strong> Integer.toString(Math.abs(host.getIP().hashCode())<a name="63" href="#63">63</a> % DEFAULT_QUEUES_HOSTS_MODULO);<a name="64" href="#64">64</a> }<a name="65" href="#65">65</a> }<a name="66" href="#66">66</a> <a name="67" href="#67">67</a> <strong>public</strong> <strong>int</strong> maximumNumberOfKeys() {<a name="68" href="#68">68</a> <strong>return</strong> DEFAULT_NOIP_BITMASK + DEFAULT_QUEUES_HOSTS_MODULO + 2;<a name="69" href="#69">69</a> }<a name="70" href="#70">70</a> }</pre><hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body></html>?? 快捷鍵說明
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