?? checkpoint.html
字號:
<!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>Checkpoint xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../apidocs/org/archive/crawler/datamodel/Checkpoint.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> Checkpoint</em></em><a name="2" href="#2">2</a> <em class="comment">*</em><a name="3" href="#3">3</a> <em class="comment">* $Id: Checkpoint.java 4047 2005-12-17 02:31:52Z stack-sf $</em><a name="4" href="#4">4</a> <em class="comment">*</em><a name="5" href="#5">5</a> <em class="comment">* Created on Apr 25, 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/datamodel/package-summary.html">org.archive.crawler.datamodel</a>;<a name="26" href="#26">26</a> <a name="27" href="#27">27</a> <strong>import</strong> java.io.File;<a name="28" href="#28">28</a> <strong>import</strong> java.io.IOException;<a name="29" href="#29">29</a> <strong>import</strong> java.io.ObjectInputStream;<a name="30" href="#30">30</a> <strong>import</strong> java.io.Serializable;<a name="31" href="#31">31</a> <a name="32" href="#32">32</a> <strong>import</strong> org.archive.crawler.util.CheckpointUtils;<a name="33" href="#33">33</a> <strong>import</strong> org.archive.util.FileUtils;<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> * Record of a specific checkpoint on disk.</em><a name="37" href="#37">37</a> <em> * Used recovering from a checkpoint or displaying list of checkpoints done</em><a name="38" href="#38">38</a> <em> * so far.</em><a name="39" href="#39">39</a> <em> * @author gojomo</em><a name="40" href="#40">40</a> <em> */</em><a name="41" href="#41">41</a> <strong>public</strong> <strong>class</strong> <a href="../../../../org/archive/crawler/datamodel/Checkpoint.html">Checkpoint</a> implements Serializable {<a name="42" href="#42">42</a> <em>/**<em>*</em></em><a name="43" href="#43">43</a> <em> * Generated by eclipse.</em><a name="44" href="#44">44</a> <em> */</em><a name="45" href="#45">45</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> <strong>long</strong> serialVersionUID = 5121498771788002844L;<a name="46" href="#46">46</a> <a name="47" href="#47">47</a> <em>/**<em>*</em></em><a name="48" href="#48">48</a> <em> * Flag label for invalid Checkpoints</em><a name="49" href="#49">49</a> <em> */</em><a name="50" href="#50">50</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> String INVALID = <span class="string">"INVALID"</span>;<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> * Name of file written with timestamp into valid checkpoints.</em><a name="54" href="#54">54</a> <em> */</em><a name="55" href="#55">55</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String VALIDITY_STAMP_FILENAME = <span class="string">"valid"</span>;<a name="56" href="#56">56</a> <a name="57" href="#57">57</a> <a name="58" href="#58">58</a> <strong>private</strong> <strong>transient</strong> String timestamp;<a name="59" href="#59">59</a> <strong>private</strong> File directory;<a name="60" href="#60">60</a> <a name="61" href="#61">61</a> <em>/**<em>*</em></em><a name="62" href="#62">62</a> <em> * Publically inaccessible default constructor.</em><a name="63" href="#63">63</a> <em> */</em><a name="64" href="#64">64</a> <strong>protected</strong> <a href="../../../../org/archive/crawler/datamodel/Checkpoint.html">Checkpoint</a>() {<a name="65" href="#65">65</a> <strong>super</strong>();<a name="66" href="#66">66</a> }<a name="67" href="#67">67</a> <a name="68" href="#68">68</a> <em>/**<em>*</em></em><a name="69" href="#69">69</a> <em> * Create a Checkpoint instance based on the given prexisting</em><a name="70" href="#70">70</a> <em> * checkpoint directory</em><a name="71" href="#71">71</a> <em> *</em><a name="72" href="#72">72</a> <em> * @param checkpointDir Directory that holds checkpoint.</em><a name="73" href="#73">73</a> <em> */</em><a name="74" href="#74">74</a> <strong>public</strong> <a href="../../../../org/archive/crawler/datamodel/Checkpoint.html">Checkpoint</a>(File checkpointDir) {<a name="75" href="#75">75</a> <strong>this</strong>.directory = checkpointDir;<a name="76" href="#76">76</a> readValid();<a name="77" href="#77">77</a> }<a name="78" href="#78">78</a> <a name="79" href="#79">79</a> <strong>private</strong> <strong>void</strong> readObject(ObjectInputStream s)<a name="80" href="#80">80</a> throws IOException, ClassNotFoundException {<a name="81" href="#81">81</a> s.defaultReadObject();<a name="82" href="#82">82</a> readValid();<a name="83" href="#83">83</a> }<a name="84" href="#84">84</a> <a name="85" href="#85">85</a> <strong>protected</strong> <strong>void</strong> readValid() {<a name="86" href="#86">86</a> File validityStamp = <strong>new</strong> File(<strong>this</strong>.directory,<a name="87" href="#87">87</a> VALIDITY_STAMP_FILENAME);<a name="88" href="#88">88</a> <strong>if</strong> (validityStamp.exists() == false) {<a name="89" href="#89">89</a> <strong>this</strong>.timestamp = INVALID;<a name="90" href="#90">90</a> } <strong>else</strong> {<a name="91" href="#91">91</a> <strong>try</strong> {<a name="92" href="#92">92</a> <strong>this</strong>.timestamp = FileUtils.readFileAsString(validityStamp).<a name="93" href="#93">93</a> trim();<a name="94" href="#94">94</a> } <strong>catch</strong> (IOException e) {<a name="95" href="#95">95</a> e.printStackTrace();<a name="96" href="#96">96</a> <strong>this</strong>.timestamp = INVALID;<a name="97" href="#97">97</a> }<a name="98" href="#98">98</a> }<a name="99" href="#99">99</a> }<a name="100" href="#100">100</a> <a name="101" href="#101">101</a> <em>/**<em>*</em></em><a name="102" href="#102">102</a> <em> * @return Return true if this checkpoint appears complete/resumable</em><a name="103" href="#103">103</a> <em> * (has 'valid' stamp file).</em><a name="104" href="#104">104</a> <em> */</em><a name="105" href="#105">105</a> <strong>public</strong> <strong>boolean</strong> isValid() {<a name="106" href="#106">106</a> <strong>return</strong> timestamp != INVALID;<a name="107" href="#107">107</a> }<a name="108" href="#108">108</a> <a name="109" href="#109">109</a> <em>/**<em>*</em></em><a name="110" href="#110">110</a> <em> * @return Returns name of this Checkpoint</em><a name="111" href="#111">111</a> <em> */</em><a name="112" href="#112">112</a> <strong>public</strong> String getName() {<a name="113" href="#113">113</a> <strong>return</strong> <strong>this</strong>.directory.getName();<a name="114" href="#114">114</a> }<a name="115" href="#115">115</a> <a name="116" href="#116">116</a> <em>/**<em>*</em></em><a name="117" href="#117">117</a> <em> * @return Return the combination of given name and timestamp most commonly</em><a name="118" href="#118">118</a> <em> * used in administrative interface.</em><a name="119" href="#119">119</a> <em> */</em><a name="120" href="#120">120</a> <strong>public</strong> String getDisplayName() {<a name="121" href="#121">121</a> <strong>return</strong> getName() + <span class="string">" ["</span> + getTimestamp() + <span class="string">"]"</span>;<a name="122" href="#122">122</a> }<a name="123" href="#123">123</a> <a name="124" href="#124">124</a> <em>/**<em>*</em></em><a name="125" href="#125">125</a> <em> * @return Returns the timestamp.</em><a name="126" href="#126">126</a> <em> */</em><a name="127" href="#127">127</a> <strong>public</strong> String getTimestamp() {<a name="128" href="#128">128</a> <strong>return</strong> timestamp;<a name="129" href="#129">129</a> }<a name="130" href="#130">130</a> <a name="131" href="#131">131</a> <em>/**<em>*</em></em><a name="132" href="#132">132</a> <em> * @return Returns the checkpoint directory.</em><a name="133" href="#133">133</a> <em> */</em><a name="134" href="#134">134</a> <strong>public</strong> File getDirectory() {<a name="135" href="#135">135</a> <strong>return</strong> <strong>this</strong>.directory;<a name="136" href="#136">136</a> }<a name="137" href="#137">137</a> <a name="138" href="#138">138</a> <em>/**<em>*</em></em><a name="139" href="#139">139</a> <em> * @return True if this checkpoint contains bdb logs (It won't if we're</em><a name="140" href="#140">140</a> <em> * doing 'fast' checkpoints).</em><a name="141" href="#141">141</a> <em> */</em><a name="142" href="#142">142</a> <strong>public</strong> <strong>boolean</strong> hasBdbjeLogs() {<a name="143" href="#143">143</a> <strong>boolean</strong> decision = false;<a name="144" href="#144">144</a> File bdbjeDir = CheckpointUtils.getBdbSubDirectory(<strong>this</strong>.directory);<a name="145" href="#145">145</a> <strong>if</strong> (bdbjeDir.exists()) {<a name="146" href="#146">146</a> String [] files =<a name="147" href="#147">147</a> bdbjeDir.list(CheckpointUtils.getJeLogsFilter());<a name="148" href="#148">148</a> decision = (files != <strong>null</strong> && files.length > 0);<a name="149" href="#149">149</a> }<a name="150" href="#150">150</a> <strong>return</strong> decision; <a name="151" href="#151">151</a> } <a name="152" href="#152">152</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
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -