runtimelimitenforcer.html

用JAVA编写的,在做实验的时候留下来的,本来想删的,但是传上来,大家分享吧

<a name="79" href="#79">79</a>          OP_PAUSE, OP_TERMINATE, OP_BLOCK_URIS};
<a name="80" href="#80">80</a>      
<a name="81" href="#81">81</a>      <strong>public</strong> <a href="../../../../org/archive/crawler/prefetch/RuntimeLimitEnforcer.html">RuntimeLimitEnforcer</a>(String name) {
<a name="82" href="#82">82</a>          <strong>super</strong>(name, <span class="string">"A processor that halts further progress once a fixed "</span> +
<a name="83" href="#83">83</a>                  <span class="string">"amount of time has elapsed since the start of a crawl. "</span> +
<a name="84" href="#84">84</a>                  <span class="string">"It is possible to configure this processor per host, but "</span> +
<a name="85" href="#85">85</a>                  <span class="string">"it should be noted that Heritrix does not track runtime "</span> +
<a name="86" href="#86">86</a>                  <span class="string">"per host seperately. Especially when using facilities "</span> +
<a name="87" href="#87">87</a>                  <span class="string">"like the BdbFrontier's hold-queues, the actual amount of "</span> +
<a name="88" href="#88">88</a>                  <span class="string">"time spent crawling a host may have little relevance to "</span> +
<a name="89" href="#89">89</a>                  <span class="string">"total elapsed time. Note however that using overrides "</span> +
<a name="90" href="#90">90</a>                  <span class="string">"and/or refinements only makes sense when using the "</span> +
<a name="91" href="#91">91</a>                  <span class="string">"'Block URIs' end operation. The pause and terminate "</span> +
<a name="92" href="#92">92</a>                  <span class="string">"operations have global impact once encountered."</span>);
<a name="93" href="#93">93</a>          <a href="../../../../org/archive/crawler/settings/Type.html">Type</a> t =  <strong>new</strong> SimpleType(
<a name="94" href="#94">94</a>                  ATTR_RUNTIME_SECONDS,
<a name="95" href="#95">95</a>                  <span class="string">"The amount of time, in seconds, that the crawl will be "</span> +
<a name="96" href="#96">96</a>                  <span class="string">"allowed to run before this processor performs it's 'end "</span> +
<a name="97" href="#97">97</a>                  <span class="string">"operation.'"</span>,
<a name="98" href="#98">98</a>                  DEFAULT_RUNTIME_SECONDS);
<a name="99" href="#99">99</a>          addElementToDefinition(t);
<a name="100" href="#100">100</a>         t = <strong>new</strong> <a href="../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(
<a name="101" href="#101">101</a>                 ATTR_END_OPERATION,
<a name="102" href="#102">102</a>                 <span class="string">"The action that the processor takes once the runtime has "</span> +
<a name="103" href="#103">103</a>                 <span class="string">"elapsed.\n "</span> +
<a name="104" href="#104">104</a>                 <span class="string">"Operation: Pause job - Pauses the crawl. A change "</span> +
<a name="105" href="#105">105</a>                 <span class="string">"(increase) to the runtime duration will "</span> +
<a name="106" href="#106">106</a>                 <span class="string">"make it pausible to resume the crawl. Attempts to resume "</span> +
<a name="107" href="#107">107</a>                 <span class="string">"the crawl without modifying the run time will cause it to "</span> +
<a name="108" href="#108">108</a>                 <span class="string">"be immediately paused again.\n "</span> +
<a name="109" href="#109">109</a>                 <span class="string">"Operation: Terminate job - Terminates the job. Equivalent "</span> +
<a name="110" href="#110">110</a>                 <span class="string">"to using the max-time setting on the CrawlController.\n "</span> +
<a name="111" href="#111">111</a>                 <span class="string">"Operation: Block URIs - Blocks each URI with an -5002 "</span> +
<a name="112" href="#112">112</a>                 <span class="string">"(blocked by custom processor) fetch status code. This will "</span> +
<a name="113" href="#113">113</a>                 <span class="string">"cause all the URIs queued to wind up in the crawl.log."</span>,
<a name="114" href="#114">114</a>                 DEFAULT_END_OPERATION, 
<a name="115" href="#115">115</a>                 AVAILABLE_END_OPERATIONS);
<a name="116" href="#116">116</a>         addElementToDefinition(t);
<a name="117" href="#117">117</a>     }
<a name="118" href="#118">118</a> 
<a name="119" href="#119">119</a>     <strong>protected</strong> <strong>void</strong> innerProcess(<a href="../../../../org/archive/crawler/datamodel/CrawlURI.html">CrawlURI</a> curi) throws InterruptedException {
<a name="120" href="#120">120</a>         <strong>long</strong> allowedRuntime = getRuntime(curi);
<a name="121" href="#121">121</a>         <strong>long</strong> currentRuntime = getController().getStatistics().crawlDuration();
<a name="122" href="#122">122</a>         <strong>if</strong>(currentRuntime > allowedRuntime){
<a name="123" href="#123">123</a>             String op = (String)getUncheckedAttribute(curi,ATTR_END_OPERATION);
<a name="124" href="#124">124</a>             <strong>if</strong>(op != <strong>null</strong>){
<a name="125" href="#125">125</a>                 <strong>if</strong>(op.equals(OP_PAUSE)){
<a name="126" href="#126">126</a>                     getController().requestCrawlPause();
<a name="127" href="#127">127</a>                 } <strong>else</strong> <strong>if</strong>(op.equals(OP_TERMINATE)){
<a name="128" href="#128">128</a>                     getController().requestCrawlStop(
<a name="129" href="#129">129</a>                             CrawlJob.STATUS_FINISHED_TIME_LIMIT);
<a name="130" href="#130">130</a>                 } <strong>else</strong> <strong>if</strong>(op.equals(OP_BLOCK_URIS)){
<a name="131" href="#131">131</a>                     curi.setFetchStatus(S_BLOCKED_BY_RUNTIME_LIMIT);
<a name="132" href="#132">132</a>                     curi.addAnnotation(<span class="string">"Runtime exceeded "</span> + allowedRuntime + 
<a name="133" href="#133">133</a>                             <span class="string">"ms"</span>);
<a name="134" href="#134">134</a>                     curi.skipToProcessorChain(
<a name="135" href="#135">135</a>                             getController().getPostprocessorChain());
<a name="136" href="#136">136</a>                 }
<a name="137" href="#137">137</a>             } <strong>else</strong> {
<a name="138" href="#138">138</a>                 logger.log(Level.SEVERE,<span class="string">"Null value for "</span> + ATTR_END_OPERATION + 
<a name="139" href="#139">139</a>                         <span class="string">" when processing "</span> + curi.toString());
<a name="140" href="#140">140</a>             }
<a name="141" href="#141">141</a>         }
<a name="142" href="#142">142</a>     }
<a name="143" href="#143">143</a>     
<a name="144" href="#144">144</a>     <em>/**<em>*</em></em>
<a name="145" href="#145">145</a> <em>     * Returns the amount of time to allow the crawl to run before this </em>
<a name="146" href="#146">146</a> <em>     * processor interrupts.</em>
<a name="147" href="#147">147</a> <em>     * @return the amount of time in milliseconds.</em>
<a name="148" href="#148">148</a> <em>     */</em>
<a name="149" href="#149">149</a>     <strong>protected</strong> <strong>long</strong> getRuntime(<a href="../../../../org/archive/crawler/datamodel/CrawlURI.html">CrawlURI</a> curi){
<a name="150" href="#150">150</a>         Object o = getUncheckedAttribute(curi,ATTR_RUNTIME_SECONDS);
<a name="151" href="#151">151</a>         <strong>if</strong>(o == <strong>null</strong>){
<a name="152" href="#152">152</a>             logger.log(Level.SEVERE,<span class="string">"Null value for "</span> + ATTR_RUNTIME_SECONDS + 
<a name="153" href="#153">153</a>                     <span class="string">" when processing "</span> + curi.toString());
<a name="154" href="#154">154</a>             <strong>return</strong> Long.MAX_VALUE;
<a name="155" href="#155">155</a>         }
<a name="156" href="#156">156</a>         <strong>return</strong> ((Long)o).longValue()*1000; <em class="comment">//extract value and convert to ms.</em>
<a name="157" href="#157">157</a>     }
<a name="158" href="#158">158</a>     
<a name="159" href="#159">159</a> }
</pre>
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