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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>RecyclingSerialBinding xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../apidocs/org/archive/crawler/frontier/RecyclingSerialBinding.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> RecyclingSerialBinding</em></em><a name="2" href="#2">2</a> <em class="comment">*</em><a name="3" href="#3">3</a> <em class="comment">* $Id: RecyclingSerialBinding.java 4667 2006-09-26 20:38:48Z paul_jack $</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 25, 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 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> java.io.IOException;<a name="28" href="#28">28</a> <a name="29" href="#29">29</a> <strong>import</strong> com.sleepycat.bind.serial.ClassCatalog;<a name="30" href="#30">30</a> <strong>import</strong> com.sleepycat.bind.serial.SerialBinding;<a name="31" href="#31">31</a> <strong>import</strong> com.sleepycat.bind.serial.SerialOutput;<a name="32" href="#32">32</a> <strong>import</strong> com.sleepycat.je.DatabaseEntry;<a name="33" href="#33">33</a> <strong>import</strong> com.sleepycat.util.FastOutputStream;<a name="34" href="#34">34</a> <strong>import</strong> com.sleepycat.util.RuntimeExceptionWrapper;<a name="35" href="#35">35</a> <a name="36" href="#36">36</a> <em>/**<em>*</em></em><a name="37" href="#37">37</a> <em> * A SerialBinding that recycles a single FastOutputStream per</em><a name="38" href="#38">38</a> <em> * thread, avoiding reallocation of the internal buffer for </em><a name="39" href="#39">39</a> <em> * either repeated serializations or because of mid-serialization</em><a name="40" href="#40">40</a> <em> * expansions. (Cached stream's buffer will quickly grow to a size </em><a name="41" href="#41">41</a> <em> * sufficient for all serialized instances.)</em><a name="42" href="#42">42</a> <em> *</em><a name="43" href="#43">43</a> <em> * @author gojomo</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/frontier/RecyclingSerialBinding.html">RecyclingSerialBinding</a> <strong>extends</strong> SerialBinding {<a name="46" href="#46">46</a> <em>/**<em>*</em></em><a name="47" href="#47">47</a> <em> * Thread-local cache of reusable FastOutputStream</em><a name="48" href="#48">48</a> <em> */</em><a name="49" href="#49">49</a> ThreadLocal<FastOutputStream> fastOutputStreamHolder<a name="50" href="#50">50</a> = <strong>new</strong> ThreadLocal<FastOutputStream>();<a name="51" href="#51">51</a> <a name="52" href="#52">52</a> <strong>private</strong> ClassCatalog classCatalog;<a name="53" href="#53">53</a> <strong>private</strong> Class baseClass;<a name="54" href="#54">54</a> <a name="55" href="#55">55</a> <em>/**<em>*</em></em><a name="56" href="#56">56</a> <em> * Constructor. Save parameters locally, as superclass </em><a name="57" href="#57">57</a> <em> * fields are private. </em><a name="58" href="#58">58</a> <em> * </em><a name="59" href="#59">59</a> <em> * @param classCatalog is the catalog to hold shared class information</em><a name="60" href="#60">60</a> <em> *</em><a name="61" href="#61">61</a> <em> * @param baseClass is the base class for serialized objects stored using</em><a name="62" href="#62">62</a> <em> * this binding</em><a name="63" href="#63">63</a> <em> */</em><a name="64" href="#64">64</a> <strong>public</strong> <a href="../../../../org/archive/crawler/frontier/RecyclingSerialBinding.html">RecyclingSerialBinding</a>(ClassCatalog classCatalog, Class baseClass) {<a name="65" href="#65">65</a> <strong>super</strong>(classCatalog, baseClass);<a name="66" href="#66">66</a> <strong>this</strong>.classCatalog = classCatalog;<a name="67" href="#67">67</a> <strong>this</strong>.baseClass = baseClass;<a name="68" href="#68">68</a> }<a name="69" href="#69">69</a> <a name="70" href="#70">70</a> <em>/**<em>*</em></em><a name="71" href="#71">71</a> <em> * Copies superclass simply to allow different source for FastOoutputStream.</em><a name="72" href="#72">72</a> <em> * </em><a name="73" href="#73">73</a> <em> * @see com.sleepycat.bind.serial.SerialBinding#entryToObject</em><a name="74" href="#74">74</a> <em> */</em><a name="75" href="#75">75</a> <strong>public</strong> <strong>void</strong> objectToEntry(Object object, DatabaseEntry entry) {<a name="76" href="#76">76</a> <a name="77" href="#77">77</a> <strong>if</strong> (baseClass != <strong>null</strong> && !baseClass.isInstance(object)) {<a name="78" href="#78">78</a> <strong>throw</strong> <strong>new</strong> IllegalArgumentException(<a name="79" href="#79">79</a> <span class="string">"Data object class ("</span> + object.getClass() +<a name="80" href="#80">80</a> <span class="string">") not an instance of binding's base class ("</span> +<a name="81" href="#81">81</a> baseClass + ')');<a name="82" href="#82">82</a> }<a name="83" href="#83">83</a> FastOutputStream fo = getFastOutputStream();<a name="84" href="#84">84</a> <strong>try</strong> {<a name="85" href="#85">85</a> SerialOutput jos = <strong>new</strong> SerialOutput(fo, classCatalog);<a name="86" href="#86">86</a> jos.writeObject(object);<a name="87" href="#87">87</a> } <strong>catch</strong> (IOException e) {<a name="88" href="#88">88</a> <strong>throw</strong> <strong>new</strong> RuntimeExceptionWrapper(e);<a name="89" href="#89">89</a> }<a name="90" href="#90">90</a> <a name="91" href="#91">91</a> byte[] hdr = SerialOutput.getStreamHeader();<a name="92" href="#92">92</a> entry.setData(fo.getBufferBytes(), hdr.length,<a name="93" href="#93">93</a> fo.getBufferLength() - hdr.length);<a name="94" href="#94">94</a> }<a name="95" href="#95">95</a> <a name="96" href="#96">96</a> <em>/**<em>*</em></em><a name="97" href="#97">97</a> <em> * Get the cached (and likely pre-grown to efficient size) FastOutputStream,</em><a name="98" href="#98">98</a> <em> * creating it if necessary. </em><a name="99" href="#99">99</a> <em> * </em><a name="100" href="#100">100</a> <em> * @return FastOutputStream</em><a name="101" href="#101">101</a> <em> */</em><a name="102" href="#102">102</a> <strong>private</strong> FastOutputStream getFastOutputStream() {<a name="103" href="#103">103</a> FastOutputStream fo = (FastOutputStream) fastOutputStreamHolder.get();<a name="104" href="#104">104</a> <strong>if</strong> (fo == <strong>null</strong>) {<a name="105" href="#105">105</a> fo = <strong>new</strong> FastOutputStream();<a name="106" href="#106">106</a> fastOutputStreamHolder.set(fo);<a name="107" href="#107">107</a> }<a name="108" href="#108">108</a> fo.reset();<a name="109" href="#109">109</a> <strong>return</strong> fo;<a name="110" href="#110">110</a> }<a name="111" href="#111">111</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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