servercache.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="105" href="#105">105</a>         servers.put(skey,cserver);
<a name="106" href="#106">106</a>         <strong>if</strong> (logger.isLoggable(Level.FINER)) {
<a name="107" href="#107">107</a>             logger.finer(<span class="string">"Created server "</span> + s);
<a name="108" href="#108">108</a>         }
<a name="109" href="#109">109</a>         <strong>return</strong> cserver;
<a name="110" href="#110">110</a>     }
<a name="111" href="#111">111</a> 
<a name="112" href="#112">112</a>     <em>/**<em>*</em></em>
<a name="113" href="#113">113</a> <em>     * Get the {@link CrawlServer} associated with &lt;code>curi&lt;/code>.</em>
<a name="114" href="#114">114</a> <em>     * @param cauri CandidateURI we're to get server from.</em>
<a name="115" href="#115">115</a> <em>     * @return CrawlServer instance that matches the passed CandidateURI.</em>
<a name="116" href="#116">116</a> <em>     */</em>
<a name="117" href="#117">117</a>     <strong>public</strong> <a href="../../../../org/archive/crawler/datamodel/CrawlServer.html">CrawlServer</a> getServerFor(<a href="../../../../org/archive/crawler/datamodel/CandidateURI.html">CandidateURI</a> cauri) {
<a name="118" href="#118">118</a>         <a href="../../../../org/archive/crawler/datamodel/CrawlServer.html">CrawlServer</a> cs = <strong>null</strong>;
<a name="119" href="#119">119</a>         <strong>try</strong> {
<a name="120" href="#120">120</a>             String key = CrawlServer.getServerKey(cauri);
<a name="121" href="#121">121</a>             <em class="comment">// TODOSOMEDAY: make this robust against those rare cases</em>
<a name="122" href="#122">122</a>             <em class="comment">// where authority is not a hostname.</em>
<a name="123" href="#123">123</a>             <strong>if</strong> (key != <strong>null</strong>) {
<a name="124" href="#124">124</a>                 cs = getServerFor(key);
<a name="125" href="#125">125</a>             }
<a name="126" href="#126">126</a>         } <strong>catch</strong> (URIException e) {
<a name="127" href="#127">127</a>             logger.severe(e.getMessage() + <span class="string">": "</span> + cauri);
<a name="128" href="#128">128</a>             e.printStackTrace();
<a name="129" href="#129">129</a>         } <strong>catch</strong> (NullPointerException npe) {
<a name="130" href="#130">130</a>             logger.severe(npe.getMessage() + <span class="string">": "</span> + cauri);
<a name="131" href="#131">131</a>             npe.printStackTrace();
<a name="132" href="#132">132</a>         }
<a name="133" href="#133">133</a>         <strong>return</strong> cs;
<a name="134" href="#134">134</a>     }
<a name="135" href="#135">135</a>     
<a name="136" href="#136">136</a>     <em>/**<em>*</em></em>
<a name="137" href="#137">137</a> <em>     * Get the {@link CrawlHost} associated with &lt;code>name&lt;/code>.</em>
<a name="138" href="#138">138</a> <em>     * @param hostname Host name we're to return Host for.</em>
<a name="139" href="#139">139</a> <em>     * @return CrawlHost instance that matches the passed Host name.</em>
<a name="140" href="#140">140</a> <em>     */</em>
<a name="141" href="#141">141</a>     <strong>public</strong> <strong>synchronized</strong> <a href="../../../../org/archive/crawler/datamodel/CrawlHost.html">CrawlHost</a> getHostFor(String hostname) {
<a name="142" href="#142">142</a>         <strong>if</strong> (hostname == <strong>null</strong> || hostname.length() == 0) {
<a name="143" href="#143">143</a>             <strong>return</strong> <strong>null</strong>;
<a name="144" href="#144">144</a>         }
<a name="145" href="#145">145</a>         <a href="../../../../org/archive/crawler/datamodel/CrawlHost.html">CrawlHost</a> host = (CrawlHost)<strong>this</strong>.hosts.get(hostname);
<a name="146" href="#146">146</a>         <strong>return</strong> (host != <strong>null</strong>)? host: createHostFor(hostname);
<a name="147" href="#147">147</a>     }
<a name="148" href="#148">148</a>     
<a name="149" href="#149">149</a>     <strong>protected</strong> <a href="../../../../org/archive/crawler/datamodel/CrawlHost.html">CrawlHost</a> createHostFor(String hostname) {
<a name="150" href="#150">150</a>         <strong>if</strong> (hostname == <strong>null</strong> || hostname.length() == 0) {
<a name="151" href="#151">151</a>             <strong>return</strong> <strong>null</strong>;
<a name="152" href="#152">152</a>         }
<a name="153" href="#153">153</a>         <a href="../../../../org/archive/crawler/datamodel/CrawlHost.html">CrawlHost</a> host = (CrawlHost)<strong>this</strong>.hosts.get(hostname);
<a name="154" href="#154">154</a>         <strong>if</strong> (host != <strong>null</strong>) {
<a name="155" href="#155">155</a>             <strong>return</strong> host;
<a name="156" href="#156">156</a>         }
<a name="157" href="#157">157</a>         String hkey = <strong>new</strong> String(hostname); 
<a name="158" href="#158">158</a>         host = <strong>new</strong> <a href="../../../../org/archive/crawler/datamodel/CrawlHost.html">CrawlHost</a>(hkey);
<a name="159" href="#159">159</a>         <strong>this</strong>.hosts.put(hkey, host);
<a name="160" href="#160">160</a>         <strong>if</strong> (logger.isLoggable(Level.FINE)) {
<a name="161" href="#161">161</a>             logger.fine(<span class="string">"Created host "</span> + hostname);
<a name="162" href="#162">162</a>         }
<a name="163" href="#163">163</a>         <strong>return</strong> host;
<a name="164" href="#164">164</a>     }
<a name="165" href="#165">165</a>     
<a name="166" href="#166">166</a>     <em>/**<em>*</em></em>
<a name="167" href="#167">167</a> <em>     * Get the {@link CrawlHost} associated with &lt;code>curi&lt;/code>.</em>
<a name="168" href="#168">168</a> <em>     * @param cauri CandidateURI we're to return Host for.</em>
<a name="169" href="#169">169</a> <em>     * @return CandidateURI instance that matches the passed Host name.</em>
<a name="170" href="#170">170</a> <em>     */</em>
<a name="171" href="#171">171</a>     <strong>public</strong> <a href="../../../../org/archive/crawler/datamodel/CrawlHost.html">CrawlHost</a> getHostFor(<a href="../../../../org/archive/crawler/datamodel/CandidateURI.html">CandidateURI</a> cauri) {
<a name="172" href="#172">172</a>         <a href="../../../../org/archive/crawler/datamodel/CrawlHost.html">CrawlHost</a> h = <strong>null</strong>;
<a name="173" href="#173">173</a>         <strong>try</strong> {
<a name="174" href="#174">174</a>             h = getHostFor(cauri.getUURI().getReferencedHost());
<a name="175" href="#175">175</a>         } <strong>catch</strong> (URIException e) {
<a name="176" href="#176">176</a>             e.printStackTrace();
<a name="177" href="#177">177</a>         }
<a name="178" href="#178">178</a>         <strong>return</strong> h;
<a name="179" href="#179">179</a>     }
<a name="180" href="#180">180</a> 
<a name="181" href="#181">181</a>     <em>/**<em>*</em></em>
<a name="182" href="#182">182</a> <em>     * @param serverKey Key to use doing lookup.</em>
<a name="183" href="#183">183</a> <em>     * @return True if a server instance exists.</em>
<a name="184" href="#184">184</a> <em>     */</em>
<a name="185" href="#185">185</a>     <strong>public</strong> <strong>boolean</strong> containsServer(String serverKey) {
<a name="186" href="#186">186</a>         <strong>return</strong> (CrawlServer) servers.get(serverKey) != <strong>null</strong>; 
<a name="187" href="#187">187</a>     }
<a name="188" href="#188">188</a> 
<a name="189" href="#189">189</a>     <em>/**<em>*</em></em>
<a name="190" href="#190">190</a> <em>     * @param hostKey Key to use doing lookup.</em>
<a name="191" href="#191">191</a> <em>     * @return True if a host instance exists.</em>
<a name="192" href="#192">192</a> <em>     */</em>
<a name="193" href="#193">193</a>     <strong>public</strong> <strong>boolean</strong> containsHost(String hostKey) {
<a name="194" href="#194">194</a>         <strong>return</strong> (CrawlHost) hosts.get(hostKey) != <strong>null</strong>; 
<a name="195" href="#195">195</a>     }
<a name="196" href="#196">196</a> 
<a name="197" href="#197">197</a>     <em>/**<em>*</em></em>
<a name="198" href="#198">198</a> <em>     * Called when shutting down the cache so we can do clean up.</em>
<a name="199" href="#199">199</a> <em>     */</em>
<a name="200" href="#200">200</a>     <strong>public</strong> <strong>void</strong> cleanup() {
<a name="201" href="#201">201</a>         <strong>if</strong> (<strong>this</strong>.hosts != <strong>null</strong>) {
<a name="202" href="#202">202</a>             <em class="comment">// If we're using a bdb bigmap, the call to clear will</em>
<a name="203" href="#203">203</a>             <em class="comment">// close down the bdb database.</em>
<a name="204" href="#204">204</a>             <strong>this</strong>.hosts.clear();
<a name="205" href="#205">205</a>             <strong>this</strong>.hosts = <strong>null</strong>;
<a name="206" href="#206">206</a>         }
<a name="207" href="#207">207</a>         <strong>if</strong> (<strong>this</strong>.servers != <strong>null</strong>) { 
<a name="208" href="#208">208</a>             <strong>this</strong>.servers.clear();
<a name="209" href="#209">209</a>             <strong>this</strong>.servers = <strong>null</strong>;
<a name="210" href="#210">210</a>         }
<a name="211" href="#211">211</a>     }
<a name="212" href="#212">212</a> }
</pre>
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