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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>RecoveryJournal xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../apidocs/org/archive/crawler/frontier/RecoveryJournal.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> RecoveryJournal</em></em><a name="2" href="#2">2</a> <em class="comment"> *</em><a name="3" href="#3">3</a> <em class="comment"> * $Id: RecoveryJournal.java 4969 2007-03-08 18:57:41Z gojomo $</em><a name="4" href="#4">4</a> <em class="comment"> *</em><a name="5" href="#5">5</a> <em class="comment"> * Created on Jul 20, 2004</em><a name="6" href="#6">6</a> <em class="comment"> *</em><a name="7" href="#7">7</a> <em class="comment"> * Copyright (C) 2004 Internet Archive.</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> <strong>package</strong> <a href="../../../../org/archive/crawler/frontier/package-summary.html">org.archive.crawler.frontier</a>;<a name="26" href="#26">26</a> <a name="27" href="#27">27</a> <strong>import</strong> it.unimi.dsi.mg4j.util.MutableString;<a name="28" href="#28">28</a> <a name="29" href="#29">29</a> <strong>import</strong> java.io.BufferedInputStream;<a name="30" href="#30">30</a> <strong>import</strong> java.io.EOFException;<a name="31" href="#31">31</a> <strong>import</strong> java.io.File;<a name="32" href="#32">32</a> <strong>import</strong> java.io.IOException;<a name="33" href="#33">33</a> <strong>import</strong> java.util.ArrayList;<a name="34" href="#34">34</a> <strong>import</strong> java.util.logging.Logger;<a name="35" href="#35">35</a> <a name="36" href="#36">36</a> <strong>import</strong> org.apache.commons.httpclient.URIException;<a name="37" href="#37">37</a> <strong>import</strong> org.archive.crawler.datamodel.CandidateURI;<a name="38" href="#38">38</a> <strong>import</strong> org.archive.crawler.datamodel.CrawlURI;<a name="39" href="#39">39</a> <strong>import</strong> org.archive.crawler.framework.Frontier;<a name="40" href="#40">40</a> <strong>import</strong> org.archive.crawler.io.CrawlerJournal;<a name="41" href="#41">41</a> <strong>import</strong> org.archive.net.UURI;<a name="42" href="#42">42</a> <strong>import</strong> org.archive.net.UURIFactory;<a name="43" href="#43">43</a> <a name="44" href="#44">44</a> <strong>import</strong> java.util.concurrent.CountDownLatch;<a name="45" href="#45">45</a> <a name="46" href="#46">46</a> <em>/**<em>*</em></em><a name="47" href="#47">47</a> <em> * Helper class for managing a simple Frontier change-events journal which is</em><a name="48" href="#48">48</a> <em> * useful for recovering from crawl problems.</em><a name="49" href="#49">49</a> <em> * </em><a name="50" href="#50">50</a> <em> * By replaying the journal into a new Frontier, its state (at least with</em><a name="51" href="#51">51</a> <em> * respect to URIs alreadyIncluded and in pending queues) will match that of the</em><a name="52" href="#52">52</a> <em> * original Frontier, allowing a pseudo-resume of a previous crawl, at least as</em><a name="53" href="#53">53</a> <em> * far as URI visitation/coverage is concerned.</em><a name="54" href="#54">54</a> <em> * </em><a name="55" href="#55">55</a> <em> * @author gojomo</em><a name="56" href="#56">56</a> <em> */</em><a name="57" href="#57">57</a> <strong>public</strong> <strong>class</strong> <a href="../../../../org/archive/crawler/frontier/RecoveryJournal.html">RecoveryJournal</a> <strong>extends</strong> <a href="../../../../org/archive/crawler/io/CrawlerJournal.html">CrawlerJournal</a> <a name="58" href="#58">58</a> implements <a href="../../../../org/archive/crawler/frontier/FrontierJournal.html">FrontierJournal</a> {<a name="59" href="#59">59</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> Logger LOGGER = Logger.getLogger(<a name="60" href="#60">60</a> RecoveryJournal.<strong>class</strong>.getName());<a name="61" href="#61">61</a> <a name="62" href="#62">62</a> <strong>public</strong> <strong>final</strong> <strong>static</strong> String F_ADD = <span class="string">"F+ "</span>;<a name="63" href="#63">63</a> <strong>public</strong> <strong>final</strong> <strong>static</strong> String F_EMIT = <span class="string">"Fe "</span>;<a name="64" href="#64">64</a> <strong>public</strong> <strong>final</strong> <strong>static</strong> String F_RESCHEDULE = <span class="string">"Fr "</span>;<a name="65" href="#65">65</a> <strong>public</strong> <strong>final</strong> <strong>static</strong> String F_SUCCESS = <span class="string">"Fs "</span>;<a name="66" href="#66">66</a> <strong>public</strong> <strong>final</strong> <strong>static</strong> String F_FAILURE = <span class="string">"Ff "</span>;<a name="67" href="#67">67</a> <a name="68" href="#68">68</a> <em class="comment">// show recovery progress every this many lines</em><a name="69" href="#69">69</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> PROGRESS_INTERVAL = 1000000;<a name="70" href="#70">70</a> <a name="71" href="#71">71</a> <em class="comment">// once this many URIs are queued during recovery, allow </em><a name="72" href="#72">72</a> <em class="comment">// crawl to begin, while enqueuing of other URIs from log</em><a name="73" href="#73">73</a> <em class="comment">// continues in background</em><a name="74" href="#74">74</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> <strong>long</strong> ENOUGH_TO_START_CRAWLING = 100000;<a name="75" href="#75">75</a> <a name="76" href="#76">76</a> <em>/**<em>*</em></em><a name="77" href="#77">77</a> <em> * Create a new recovery journal at the given location</em><a name="78" href="#78">78</a> <em> * </em><a name="79" href="#79">79</a> <em> * @param path Directory to make the recovery journal in.</em><a name="80" href="#80">80</a> <em> * @param filename Name to use for recovery journal file.</em><a name="81" href="#81">81</a> <em> * @throws IOException</em><a name="82" href="#82">82</a> <em> */</em><a name="83" href="#83">83</a> <strong>public</strong> <a href="../../../../org/archive/crawler/frontier/RecoveryJournal.html">RecoveryJournal</a>(String path, String filename)<a name="84" href="#84">84</a> throws IOException {<a name="85" href="#85">85</a> <strong>super</strong>(path,filename);<a name="86" href="#86">86</a> timestamp_interval = 10000; <em class="comment">// write timestamp lines occasionally</em><a name="87" href="#87">87</a> }<a name="88" href="#88">88</a> <a name="89" href="#89">89</a> <strong>public</strong> <strong>synchronized</strong> <strong>void</strong> added(<a href="../../../../org/archive/crawler/datamodel/CrawlURI.html">CrawlURI</a> curi) {<a name="90" href="#90">90</a> accumulatingBuffer.length(0);<a name="91" href="#91">91</a> <strong>this</strong>.accumulatingBuffer.append(F_ADD).<a name="92" href="#92">92</a> append(curi.toString()).<a name="93" href="#93">93</a> append(<span class="string">" "</span>). <a name="94" href="#94">94</a> append(curi.getPathFromSeed()).<a name="95" href="#95">95</a> append(<span class="string">" "</span>).<a name="96" href="#96">96</a> append(curi.flattenVia());<a name="97" href="#97">97</a> writeLine(accumulatingBuffer);<a name="98" href="#98">98</a> }<a name="99" href="#99">99</a> <a name="100" href="#100">100</a> <strong>public</strong> <strong>void</strong> finishedSuccess(<a href="../../../../org/archive/crawler/datamodel/CrawlURI.html">CrawlURI</a> curi) {<a name="101" href="#101">101</a> finishedSuccess(curi.toString());<a name="102" href="#102">102</a> }<a name="103" href="#103">103</a> <a name="104" href="#104">104</a> <strong>public</strong> <strong>void</strong> finishedSuccess(<a href="../../../../org/archive/net/UURI.html">UURI</a> uuri) {<a name="105" href="#105">105</a> finishedSuccess(uuri.toString());<a name="106" href="#106">106</a> }<a name="107" href="#107">107</a> <a name="108" href="#108">108</a> <strong>protected</strong> <strong>void</strong> finishedSuccess(String uuri) {<a name="109" href="#109">109</a> writeLine(F_SUCCESS, uuri);<a name="110" href="#110">110</a> }<a name="111" href="#111">111</a> <a name="112" href="#112">112</a> <strong>public</strong> <strong>void</strong> emitted(<a href="../../../../org/archive/crawler/datamodel/CrawlURI.html">CrawlURI</a> curi) {<a name="113" href="#113">113</a> writeLine(F_EMIT, curi.toString());<a name="114" href="#114">114</a> <a name="115" href="#115">115</a> }<a name="116" href="#116">116</a> <a name="117" href="#117">117</a> <strong>public</strong> <strong>void</strong> finishedFailure(<a href="../../../../org/archive/crawler/datamodel/CrawlURI.html">CrawlURI</a> curi) {<a name="118" href="#118">118</a> finishedFailure(curi.toString());<a name="119" href="#119">119</a> }<a name="120" href="#120">120</a> ?? 快捷鍵說明
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