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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>BdbWorkQueue xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../apidocs/org/archive/crawler/frontier/BdbWorkQueue.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> BdbWorkQueue</em></em><a name="2" href="#2">2</a> <em class="comment"> * </em><a name="3" href="#3">3</a> <em class="comment"> * Created on Dec 24, 2004</em><a name="4" href="#4">4</a> <em class="comment"> *</em><a name="5" href="#5">5</a> <em class="comment"> * Copyright (C) 2004 Internet Archive.</em><a name="6" href="#6">6</a> <em class="comment"> * </em><a name="7" href="#7">7</a> <em class="comment"> * This file is part of the Heritrix web crawler (crawler.archive.org).</em><a name="8" href="#8">8</a> <em class="comment"> * </em><a name="9" href="#9">9</a> <em class="comment"> * Heritrix is free software; you can redistribute it and/or modify</em><a name="10" href="#10">10</a> <em class="comment"> * it under the terms of the GNU Lesser Public License as published by</em><a name="11" href="#11">11</a> <em class="comment"> * the Free Software Foundation; either version 2.1 of the License, or</em><a name="12" href="#12">12</a> <em class="comment"> * any later version.</em><a name="13" href="#13">13</a> <em class="comment"> * </em><a name="14" href="#14">14</a> <em class="comment"> * Heritrix is distributed in the hope that it will be useful, </em><a name="15" href="#15">15</a> <em class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</em><a name="16" href="#16">16</a> <em class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</em><a name="17" href="#17">17</a> <em class="comment"> * GNU Lesser Public License for more details.</em><a name="18" href="#18">18</a> <em class="comment"> * </em><a name="19" href="#19">19</a> <em class="comment"> * You should have received a copy of the GNU Lesser Public License</em><a name="20" href="#20">20</a> <em class="comment"> * along with Heritrix; if not, write to the Free Software</em><a name="21" href="#21">21</a> <em class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</em><a name="22" href="#22">22</a> <em class="comment"> */</em><a name="23" href="#23">23</a> <strong>package</strong> <a href="../../../../org/archive/crawler/frontier/package-summary.html">org.archive.crawler.frontier</a>;<a name="24" href="#24">24</a> <a name="25" href="#25">25</a> <strong>import</strong> java.io.IOException;<a name="26" href="#26">26</a> <strong>import</strong> java.io.Serializable;<a name="27" href="#27">27</a> <strong>import</strong> java.io.UnsupportedEncodingException;<a name="28" href="#28">28</a> <strong>import</strong> java.util.logging.Level;<a name="29" href="#29">29</a> <strong>import</strong> java.util.logging.Logger;<a name="30" href="#30">30</a> <a name="31" href="#31">31</a> <strong>import</strong> org.archive.crawler.datamodel.CrawlURI;<a name="32" href="#32">32</a> <strong>import</strong> org.archive.util.ArchiveUtils;<a name="33" href="#33">33</a> <strong>import</strong> org.archive.util.IoUtils;<a name="34" href="#34">34</a> <a name="35" href="#35">35</a> <strong>import</strong> com.sleepycat.je.DatabaseEntry;<a name="36" href="#36">36</a> <strong>import</strong> com.sleepycat.je.DatabaseException;<a name="37" href="#37">37</a> <a name="38" href="#38">38</a> <a name="39" href="#39">39</a> <em>/**<em>*</em></em><a name="40" href="#40">40</a> <em> * One independent queue of items with the same 'classKey' (eg host).</em><a name="41" href="#41">41</a> <em> * @author gojomo</em><a name="42" href="#42">42</a> <em> */</em><a name="43" href="#43">43</a> <strong>public</strong> <strong>class</strong> <a href="../../../../org/archive/crawler/frontier/BdbWorkQueue.html">BdbWorkQueue</a> <strong>extends</strong> <a href="../../../../org/archive/crawler/frontier/WorkQueue.html">WorkQueue</a><a name="44" href="#44">44</a> implements Comparable, Serializable {<a name="45" href="#45">45</a> <strong>private</strong> <strong>static</strong> Logger LOGGER =<a name="46" href="#46">46</a> Logger.getLogger(BdbWorkQueue.<strong>class</strong>.getName());<a name="47" href="#47">47</a> <a name="48" href="#48">48</a> <em class="comment">// be robust against trivial implementation changes</em><a name="49" href="#49">49</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> <strong>long</strong> serialVersionUID = <a href="../../../../org/archive/util/ArchiveUtils.html">ArchiveUtils</a><a name="50" href="#50">50</a> .<strong>class</strong>nameBasedUID(BdbWorkQueue.<strong>class</strong>, 1);<a name="51" href="#51">51</a> <a name="52" href="#52">52</a> <em>/**<em>*</em></em><a name="53" href="#53">53</a> <em> * All items in this queue have this same 'origin'</em><a name="54" href="#54">54</a> <em> * prefix to their keys.</em><a name="55" href="#55">55</a> <em> */</em><a name="56" href="#56">56</a> <strong>private</strong> byte[] origin;<a name="57" href="#57">57</a> <a name="58" href="#58">58</a> <em>/**<em>*</em></em><a name="59" href="#59">59</a> <em> * Create a virtual queue inside the given BdbMultipleWorkQueues </em><a name="60" href="#60">60</a> <em> * </em><a name="61" href="#61">61</a> <em> * @param classKey</em><a name="62" href="#62">62</a> <em> */</em><a name="63" href="#63">63</a> <strong>public</strong> <a href="../../../../org/archive/crawler/frontier/BdbWorkQueue.html">BdbWorkQueue</a>(String classKey, <a href="../../../../org/archive/crawler/frontier/BdbFrontier.html">BdbFrontier</a> frontier) {<a name="64" href="#64">64</a> <strong>super</strong>(classKey);<a name="65" href="#65">65</a> <strong>this</strong>.origin = BdbMultipleWorkQueues.calculateOriginKey(classKey);<a name="66" href="#66">66</a> <strong>if</strong> (LOGGER.isLoggable(Level.FINE)) {<a name="67" href="#67">67</a> LOGGER.fine(getPrefixClassKey(<strong>this</strong>.origin) + <span class="string">" "</span> + classKey);<a name="68" href="#68">68</a> }<a name="69" href="#69">69</a> <em class="comment">// add the queue-front 'cap' entry; see...</em><a name="70" href="#70">70</a> <em class="comment">// http://sourceforge.net/tracker/index.php?func=detail&aid=1262665&group_id=73833&atid=539102</em><a name="71" href="#71">71</a> frontier.getWorkQueues().addCap(origin);<a name="72" href="#72">72</a> }<a name="73" href="#73">73</a> <a name="74" href="#74">74</a> <strong>protected</strong> <strong>long</strong> deleteMatchingFromQueue(<strong>final</strong> <a href="../../../../org/archive/crawler/frontier/WorkQueueFrontier.html">WorkQueueFrontier</a> frontier,<a name="75" href="#75">75</a> <strong>final</strong> String match) throws IOException {<a name="76" href="#76">76</a> <strong>try</strong> {<a name="77" href="#77">77</a> <strong>final</strong> <a href="../../../../org/archive/crawler/frontier/BdbMultipleWorkQueues.html">BdbMultipleWorkQueues</a> queues = ((BdbFrontier) frontier)<a name="78" href="#78">78</a> .getWorkQueues();<a name="79" href="#79">79</a> <strong>return</strong> queues.deleteMatchingFromQueue(match, classKey,<a name="80" href="#80">80</a> <strong>new</strong> DatabaseEntry(origin));<a name="81" href="#81">81</a> } <strong>catch</strong> (DatabaseException e) {<a name="82" href="#82">82</a> <strong>throw</strong> IoUtils.wrapAsIOException(e);<a name="83" href="#83">83</a> }<a name="84" href="#84">84</a> }<a name="85" href="#85">85</a> <a name="86" href="#86">86</a> <strong>protected</strong> <strong>void</strong> deleteItem(<strong>final</strong> <a href="../../../../org/archive/crawler/frontier/WorkQueueFrontier.html">WorkQueueFrontier</a> frontier,<a name="87" href="#87">87</a> <strong>final</strong> <a href="../../../../org/archive/crawler/datamodel/CrawlURI.html">CrawlURI</a> peekItem) throws IOException {⌨️ 快捷键说明
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