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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>FrontierHostStatistics xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../apidocs/org/archive/crawler/framework/FrontierHostStatistics.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> URIFrontierHostStatistics</em></em><a name="2" href="#2">2</a> <em class="comment"> *</em><a name="3" href="#3">3</a> <em class="comment"> * $Id: FrontierHostStatistics.java,v 1.1 2004/09/02 02:16:08 gojomo Exp $</em><a name="4" href="#4">4</a> <em class="comment"> *</em><a name="5" href="#5">5</a> <em class="comment"> * Created on Mar 30, 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/framework/package-summary.html">org.archive.crawler.framework</a>;<a name="26" href="#26">26</a> <a name="27" href="#27">27</a> <a name="28" href="#28">28</a> <em>/**<em>*</em></em><a name="29" href="#29">29</a> <em> * An optional interface the Frontiers can implement to provide information</em><a name="30" href="#30">30</a> <em> * about specific hosts.</em><a name="31" href="#31">31</a> <em> *</em><a name="32" href="#32">32</a> <em> * <p>Some URIFrontier implmentations will want to provide a number of</em><a name="33" href="#33">33</a> <em> * statistics relating to the progress of particular hosts. This only applies</em><a name="34" href="#34">34</a> <em> * to those Frontiers whose internal structure uses hosts to split up the</em><a name="35" href="#35">35</a> <em> * workload and (for example) implement politeness. Some other Frontiers may</em><a name="36" href="#36">36</a> <em> * also provide this info based on calculations.</em><a name="37" href="#37">37</a> <em> *</em><a name="38" href="#38">38</a> <em> * <ul></em><a name="39" href="#39">39</a> <em> * <li> {@link #activeHosts() Active hosts}</em><a name="40" href="#40">40</a> <em> * <li> {@link #inactiveHosts() Inactive hosts}</em><a name="41" href="#41">41</a> <em> * <li> {@link #deferredHosts() deferred hosts}</em><a name="42" href="#42">42</a> <em> * <li> {@link #inProcessHosts() In process hosts}</em><a name="43" href="#43">43</a> <em> * <li> {@link #readyHosts() Ready hosts}</em><a name="44" href="#44">44</a> <em> * <li> {@link #hostStatus(String) Host status}</em><a name="45" href="#45">45</a> <em> * </ul></em><a name="46" href="#46">46</a> <em> *</em><a name="47" href="#47">47</a> <em> * @author Kristinn Sigurdsson</em><a name="48" href="#48">48</a> <em> *</em><a name="49" href="#49">49</a> <em> * @see org.archive.crawler.framework.Frontier</em><a name="50" href="#50">50</a> <em> */</em><a name="51" href="#51">51</a> <strong>public</strong> <strong>interface</strong> <a href="../../../../org/archive/crawler/framework/FrontierHostStatistics.html">FrontierHostStatistics</a> {<a name="52" href="#52">52</a> <a name="53" href="#53">53</a> <em>/**<em>*</em></em><a name="54" href="#54">54</a> <em> * Host has not been encountered by the Frontier, or has been encountered</em><a name="55" href="#55">55</a> <em> * but has been inactive so long that it has expired.</em><a name="56" href="#56">56</a> <em> */</em><a name="57" href="#57">57</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> HOST_UNKNOWN = 0;<a name="58" href="#58">58</a> <em>/**<em>* Host has URIs ready to be emited. */</em></em><a name="59" href="#59">59</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> HOST_READY = 1;<a name="60" href="#60">60</a> <em>/**<em>* Host has URIs currently being proessed. */</em></em><a name="61" href="#61">61</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> HOST_INPROCESS = 2;<a name="62" href="#62">62</a> <em>/**<em>*</em></em><a name="63" href="#63">63</a> <em> * Host has been deferred for some amount of time, will become ready once</em><a name="64" href="#64">64</a> <em> * once that time has elapsed. This is most likely due to politeness or</em><a name="65" href="#65">65</a> <em> * waiting between retries. Other conditions may exist.</em><a name="66" href="#66">66</a> <em> */</em><a name="67" href="#67">67</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> HOST_DEFERRED = 3;<a name="68" href="#68">68</a> <em>/**<em>*</em></em><a name="69" href="#69">69</a> <em> * Host has been encountered and all availible URIs for it have been</em><a name="70" href="#70">70</a> <em> * processed already. More URIs may become availible later or not.</em><a name="71" href="#71">71</a> <em> * Inactive hosts may eventually become 'forgotten'.</em><a name="72" href="#72">72</a> <em> */</em><a name="73" href="#73">73</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> <strong>int</strong> HOST_INACTIVE = 4;<a name="74" href="#74">74</a> <a name="75" href="#75">75</a> <em>/**<em>*</em></em><a name="76" href="#76">76</a> <em> * Total number of hosts that are currently active.</em><a name="77" href="#77">77</a> <em> *</em><a name="78" href="#78">78</a> <em> * <p>Active hosts are considered to be those that are ready, deferred or</em><a name="79" href="#79">79</a> <em> * in process.</em><a name="80" href="#80">80</a> <em> *</em><a name="81" href="#81">81</a> <em> * @return Total number of hosts that are currently active.</em><a name="82" href="#82">82</a> <em> */</em><a name="83" href="#83">83</a> <strong>public</strong> <strong>int</strong> activeHosts();<a name="84" href="#84">84</a> <a name="85" href="#85">85</a> <em>/**<em>*</em></em><a name="86" href="#86">86</a> <em> * Total number of inactive hosts.</em><a name="87" href="#87">87</a> <em> *</em><a name="88" href="#88">88</a> <em> * <p>Inactive hosts are those hosts that have been active but have now been</em><a name="89" href="#89">89</a> <em> * exhausted and contain no more additional URIs.</em><a name="90" href="#90">90</a> <em> *</em><a name="91" href="#91">91</a> <em> * @return Total number of inactive hosts.</em><a name="92" href="#92">92</a> <em> */</em><a name="93" href="#93">93</a> <strong>public</strong> <strong>int</strong> inactiveHosts();<a name="94" href="#94">94</a> <a name="95" href="#95">95</a> <em>/**<em>*</em></em><a name="96" href="#96">96</a> <em> * Total number of deferred hosts.</em><a name="97" href="#97">97</a> <em> *</em><a name="98" href="#98">98</a> <em> * <p>Deferred hosts are currently active hosts that have been deferred</em><a name="99" href="#99">99</a> <em> * from processing for the time being (becausee of politeness or waiting</em><a name="100" href="#100">100</a> <em> * before retrying.</em><a name="101" href="#101">101</a> <em> *</em><a name="102" href="#102">102</a> <em> * @return Total number of deferred hosts.</em><a name="103" href="#103">103</a> <em> */</em><a name="104" href="#104">104</a> <strong>public</strong> <strong>int</strong> deferredHosts();<a name="105" href="#105">105</a> <a name="106" href="#106">106</a> <em>/**<em>*</em></em><a name="107" href="#107">107</a> <em> * Total number of hosts with URIs in process.</em><a name="108" href="#108">108</a> <em> *</em><a name="109" href="#109">109</a> <em> * <p>It is generally assumed that each host can have only 1 URI in</em><a name="110" href="#110">110</a> <em> * process at the same time. However some frontiers may implement</em><a name="111" href="#111">111</a> <em> * politeness differently meaning that the same host is both ready and</em><a name="112" href="#112">112</a> <em> * in process. {@link #activeHosts() activeHosts()} will not count them</em><a name="113" href="#113">113</a> <em> * twice though.</em><a name="114" href="#114">114</a> <em> *</em><a name="115" href="#115">115</a> <em> * @return Total number of hosts with URIs in process.</em><a name="116" href="#116">116</a> <em> */</em><a name="117" href="#117">117</a> <strong>public</strong> <strong>int</strong> inProcessHosts();<a name="118" href="#118">118</a> <a name="119" href="#119">119</a> <em>/**<em>*</em></em><a name="120" href="#120">120</a> <em> * Total number of hosts that have a URI ready for processing.</em><a name="121" href="#121">121</a> <em> *</em><a name="122" href="#122">122</a> <em> * @return Total number of hosts that have a URI ready for processing.</em><a name="123" href="#123">123</a> <em> */</em><a name="124" href="#124">124</a> <strong>public</strong> <strong>int</strong> readyHosts();<a name="125" href="#125">125</a> <a name="126" href="#126">126</a> <em>/**<em>*</em></em><a name="127" href="#127">127</a> <em> * Get the status of a host.</em><a name="128" href="#128">128</a> <em> *</em><a name="129" href="#129">129</a> <em> * <p>Hosts can be in one of the following states:</em><a name="130" href="#130">130</a> <em> * <ul></em><a name="131" href="#131">131</a> <em> * <li> {@link #HOST_READY Ready}</em><a name="132" href="#132">132</a> <em> * <li> {@link #HOST_INPROCESS In process}</em><a name="133" href="#133">133</a> <em> * <li> {@link #HOST_DEFERRED deferred}</em><a name="134" href="#134">134</a> <em> * <li> {@link #HOST_INACTIVE Inactive}</em><a name="135" href="#135">135</a> <em> * <li> {@link #HOST_UNKNOWN Unknown}</em><a name="136" href="#136">136</a> <em> * </ul></em><a name="137" href="#137">137</a> <em> *</em><a name="138" href="#138">138</a> <em> * <p>Some Frontiers may allow a host to have more then one URI in process</em><a name="139" href="#139">139</a> <em> * at the same time. In those cases it will be reported as</em><a name="140" href="#140">140</a> <em> * {@link #HOST_READY Ready} as long as it is has more URIs ready for</em><a name="141" href="#141">141</a> <em> * processing. Only once it has no more possible URIs for processing will</em><a name="142" href="#142">142</a> <em> * it be reported as {@link #HOST_INPROCESS In process}</em><a name="143" href="#143">143</a> <em> *</em><a name="144" href="#144">144</a> <em> * @param host The name of the host to lookup the status for.</em><a name="145" href="#145">145</a> <em> * @return The status of the specified host.</em><a name="146" href="#146">146</a> <em> *</em><a name="147" href="#147">147</a> <em> * @see #HOST_DEFERRED</em><a name="148" href="#148">148</a> <em> * @see #HOST_INACTIVE</em><a name="149" href="#149">149</a> <em> * @see #HOST_INPROCESS</em><a name="150" href="#150">150</a> <em> * @see #HOST_READY</em><a name="151" href="#151">151</a> <em> * @see #HOST_UNKNOWN</em><a name="152" href="#152">152</a> <em> */</em><a name="153" href="#153">153</a> <strong>public</strong> <strong>int</strong> hostStatus(String host);<a name="154" href="#154">154</a> <a name="155" href="#155">155</a> }</pre><hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body></html>⌨️ 快捷键说明
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