crawlmapper.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="159" href="#159">159</a>                         0,
<a name="160" href="#160">160</a>                         ((Integer) getUncheckedAttribute(<strong>null</strong>,
<a name="161" href="#161">161</a>                                 ATTR_ROTATION_DIGITS)).intValue());
<a name="162" href="#162">162</a>         <strong>if</strong>(!nowGeneration.equals(logGeneration)) {
<a name="163" href="#163">163</a>             updateGeneration(nowGeneration);
<a name="164" href="#164">164</a>         }
<a name="165" href="#165">165</a>         
<a name="166" href="#166">166</a>         <strong>if</strong> (curi.getFetchStatus() == 0
<a name="167" href="#167">167</a>                 &amp;&amp; ((Boolean) getUncheckedAttribute(<strong>null</strong>, ATTR_CHECK_URI))
<a name="168" href="#168">168</a>                         .booleanValue()) {
<a name="169" href="#169">169</a>             <em class="comment">// apply mapping to the CrawlURI itself</em>
<a name="170" href="#170">170</a>             String target = map(curi);
<a name="171" href="#171">171</a>             <strong>if</strong>(!localName.equals(target)) {
<a name="172" href="#172">172</a>                 <em class="comment">// CrawlURI is mapped to somewhere other than here</em>
<a name="173" href="#173">173</a>                 curi.setFetchStatus(S_BLOCKED_BY_CUSTOM_PROCESSOR);
<a name="174" href="#174">174</a>                 curi.addAnnotation(<span class="string">"to:"</span>+target);
<a name="175" href="#175">175</a>                 curi.skipToProcessorChain(getController().
<a name="176" href="#176">176</a>                         getPostprocessorChain());
<a name="177" href="#177">177</a>                 divertLog(curi,target);
<a name="178" href="#178">178</a>             } <strong>else</strong> {
<a name="179" href="#179">179</a>                 <em class="comment">// localName means keep locally; do nothing</em>
<a name="180" href="#180">180</a>             }
<a name="181" href="#181">181</a>         }
<a name="182" href="#182">182</a>         
<a name="183" href="#183">183</a>         <strong>if</strong> (curi.getOutLinks().size() > 0 &amp;&amp; 
<a name="184" href="#184">184</a>                 ((Boolean) getUncheckedAttribute(<strong>null</strong>, ATTR_CHECK_OUTLINKS))
<a name="185" href="#185">185</a>                         .booleanValue()) {
<a name="186" href="#186">186</a>             <em class="comment">// consider outlinks for mapping</em>
<a name="187" href="#187">187</a>             Iterator iter = curi.getOutLinks().iterator(); 
<a name="188" href="#188">188</a>             <strong>while</strong>(iter.hasNext()) {
<a name="189" href="#189">189</a>                 Object next = iter.next();
<a name="190" href="#190">190</a>                 <strong>if</strong>(! (next instanceof CandidateURI)) {
<a name="191" href="#191">191</a>                     <strong>continue</strong>;
<a name="192" href="#192">192</a>                 }
<a name="193" href="#193">193</a>                 <a href="../../../../org/archive/crawler/datamodel/CandidateURI.html">CandidateURI</a> cauri = (CandidateURI)next; 
<a name="194" href="#194">194</a> 
<a name="195" href="#195">195</a>                 <strong>if</strong> (decideToMapOutlink(cauri)) {
<a name="196" href="#196">196</a>                     <em class="comment">// apply mapping to the CandidateURI</em>
<a name="197" href="#197">197</a>                     String target = map(cauri);
<a name="198" href="#198">198</a>                     <strong>if</strong>(!localName.equals(target)) {
<a name="199" href="#199">199</a>                         <em class="comment">// CandidateURI is mapped to somewhere other than here</em>
<a name="200" href="#200">200</a>                         iter.remove();
<a name="201" href="#201">201</a>                         divertLog(cauri,target);
<a name="202" href="#202">202</a>                     } <strong>else</strong> {
<a name="203" href="#203">203</a>                         <em class="comment">// localName means keep locally; do nothing</em>
<a name="204" href="#204">204</a>                     }
<a name="205" href="#205">205</a>                 }
<a name="206" href="#206">206</a>             }
<a name="207" href="#207">207</a>         }
<a name="208" href="#208">208</a>     }
<a name="209" href="#209">209</a>     
<a name="210" href="#210">210</a>     <strong>protected</strong> <strong>boolean</strong> decideToMapOutlink(<a href="../../../../org/archive/crawler/datamodel/CandidateURI.html">CandidateURI</a> cauri) {
<a name="211" href="#211">211</a>         <strong>boolean</strong> rejected = getMapOutlinkDecideRule(cauri).decisionFor(cauri)
<a name="212" href="#212">212</a>                 .equals(DecideRule.REJECT);
<a name="213" href="#213">213</a>         <strong>return</strong> !rejected;
<a name="214" href="#214">214</a>     }
<a name="215" href="#215">215</a> 
<a name="216" href="#216">216</a>     <strong>protected</strong> <a href="../../../../org/archive/crawler/deciderules/DecideRule.html">DecideRule</a> getMapOutlinkDecideRule(Object o) {
<a name="217" href="#217">217</a>         <strong>try</strong> {
<a name="218" href="#218">218</a>             <strong>return</strong> (DecideRule)getAttribute(o, ATTR_MAP_OUTLINK_DECIDE_RULES);
<a name="219" href="#219">219</a>         } <strong>catch</strong> (AttributeNotFoundException e) {
<a name="220" href="#220">220</a>             <strong>throw</strong> <strong>new</strong> RuntimeException(e);
<a name="221" href="#221">221</a>         }
<a name="222" href="#222">222</a>     }
<a name="223" href="#223">223</a>     
<a name="224" href="#224">224</a>     
<a name="225" href="#225">225</a>     <em>/**<em>*</em></em>
<a name="226" href="#226">226</a> <em>     * Close and mark as finished all existing diversion logs, and</em>
<a name="227" href="#227">227</a> <em>     * arrange for new logs to use the new generation prefix.</em>
<a name="228" href="#228">228</a> <em>     * </em>
<a name="229" href="#229">229</a> <em>     * @param nowGeneration new generation (timestamp prefix) to use</em>
<a name="230" href="#230">230</a> <em>     */</em>
<a name="231" href="#231">231</a>     <strong>protected</strong> <strong>synchronized</strong> <strong>void</strong> updateGeneration(String nowGeneration) {
<a name="232" href="#232">232</a>         <em class="comment">// all existing logs are of a previous generation</em>
<a name="233" href="#233">233</a>         Iterator iter = diversionLogs.values().iterator();
<a name="234" href="#234">234</a>         <strong>while</strong>(iter.hasNext()) {
<a name="235" href="#235">235</a>             FilePrintWriter writer = (FilePrintWriter) iter.next();
<a name="236" href="#236">236</a>             writer.close();
<a name="237" href="#237">237</a>             writer.getFile().renameTo(
<a name="238" href="#238">238</a>                     <strong>new</strong> File(writer.getFile().getAbsolutePath()
<a name="239" href="#239">239</a>                             .replaceFirst(<span class="string">"&#47;&#47;.open$"</span>, <span class="string">".divert"</span>)));
<a name="240" href="#240">240</a>         }
<a name="241" href="#241">241</a>         diversionLogs.clear();
<a name="242" href="#242">242</a>         logGeneration = nowGeneration;
<a name="243" href="#243">243</a>     }
<a name="244" href="#244">244</a> 
<a name="245" href="#245">245</a>     <em>/**<em>*</em></em>
<a name="246" href="#246">246</a> <em>     * Look up the crawler node name to which the given CandidateURI </em>
<a name="247" href="#247">247</a> <em>     * should be mapped. </em>
<a name="248" href="#248">248</a> <em>     * </em>
<a name="249" href="#249">249</a> <em>     * @param cauri CandidateURI to consider</em>
<a name="250" href="#250">250</a> <em>     * @return String node name which should handle URI</em>
<a name="251" href="#251">251</a> <em>     */</em>
<a name="252" href="#252">252</a>     <strong>protected</strong> <strong>abstract</strong> String map(<a href="../../../../org/archive/crawler/datamodel/CandidateURI.html">CandidateURI</a> cauri);
<a name="253" href="#253">253</a> 
<a name="254" href="#254">254</a>     
<a name="255" href="#255">255</a>     <em>/**<em>*</em></em>
<a name="256" href="#256">256</a> <em>     * Note the given CandidateURI in the appropriate diversion log. </em>
<a name="257" href="#257">257</a> <em>     * </em>
<a name="258" href="#258">258</a> <em>     * @param cauri CandidateURI to append to a diversion log</em>
<a name="259" href="#259">259</a> <em>     * @param target String node name (log name) to receive URI</em>
<a name="260" href="#260">260</a> <em>     */</em>
<a name="261" href="#261">261</a>     <strong>protected</strong> <strong>synchronized</strong> <strong>void</strong> divertLog(<a href="../../../../org/archive/crawler/datamodel/CandidateURI.html">CandidateURI</a> cauri, String target) {
<a name="262" href="#262">262</a>         <strong>if</strong>(recentlySeen(cauri)) {
<a name="263" href="#263">263</a>             <strong>return</strong>;
<a name="264" href="#264">264</a>         }
<a name="265" href="#265">265</a>         PrintWriter diversionLog = getDiversionLog(target);
<a name="266" href="#266">266</a>         cauri.singleLineReportTo(diversionLog);
<a name="267" href="#267">267</a>         diversionLog.println();
<a name="268" href="#268">268</a>     }
<a name="269" href="#269">269</a>     
<a name="270" href="#270">270</a>     <em>/**<em>*</em></em>
<a name="271" href="#271">271</a> <em>     * Consult the cache to determine if the given URI</em>
<a name="272" href="#272">272</a> <em>     * has been recently seen -- entering it if not. </em>
<a name="273" href="#273">273</a> <em>     * </em>
<a name="274" href="#274">274</a> <em>     * @param cauri CandidateURI to test</em>
<a name="275" href="#275">275</a> <em>     * @return true if URI was already in the cache; false otherwise </em>
<a name="276" href="#276">276</a> <em>     */</em>
<a name="277" href="#277">277</a>     <strong>private</strong> <strong>boolean</strong> recentlySeen(<a href="../../../../org/archive/crawler/datamodel/CandidateURI.html">CandidateURI</a> cauri) {
<a name="278" href="#278">278</a>         <strong>long</strong> fp = FPGenerator.std64.fp(cauri.getURIString());
<a name="279" href="#279">279</a>         <strong>return</strong> ! cache.add(fp);
<a name="280" href="#280">280</a>     }
<a name="281" href="#281">281</a> 
<a name="282" href="#282">282</a>     <em>/**<em>*</em></em>
<a name="283" href="#283">283</a> <em>     * Get the diversion log for a given target crawler node node. </em>
<a name="284" href="#284">284</a> <em>     * </em>
<a name="285" href="#285">285</a> <em>     * @param target crawler node name of requested log</em>
<a name="286" href="#286">286</a> <em>     * @return PrintWriter open on an appropriately-named </em>
<a name="287" href="#287">287</a> <em>     * log file</em>
<a name="288" href="#288">288</a> <em>     */</em>
<a name="289" href="#289">289</a>     <strong>protected</strong> PrintWriter getDiversionLog(String target) {
<a name="290" href="#290">290</a>         FilePrintWriter writer = (FilePrintWriter) diversionLogs.get(target);
<a name="291" href="#291">291</a>         <strong>if</strong>(writer == <strong>null</strong>) {
<a name="292" href="#292">292</a>             String divertDirPath = (String) getUncheckedAttribute(<strong>null</strong>,ATTR_DIVERSION_DIR);
<a name="293" href="#293">293</a>             File divertDir = <strong>new</strong> File(divertDirPath);
<a name="294" href="#294">294</a>             <strong>if</strong> (!divertDir.isAbsolute()) {
<a name="295" href="#295">295</a>                 divertDir = <strong>new</strong> File(getSettingsHandler().getOrder()
<a name="296" href="#296">296</a>                         .getController().getDisk(), divertDirPath);
<a name="297" href="#297">297</a>             }
<a name="298" href="#298">298</a>             divertDir.mkdirs();
<a name="299" href="#299">299</a>             File divertLog = 
<a name="300" href="#300">300</a>                 <strong>new</strong> File(divertDir,
<a name="301" href="#301">301</a>                          logGeneration+<span class="string">"-"</span>+localName+<span class="string">"-to-"</span>+target+<span class="string">".open"</span>);
<a name="302" href="#302">302</a>             <strong>try</strong> {
<a name="303" href="#303">303</a>                 writer = <strong>new</strong> FilePrintWriter(divertLog);
<a name="304" href="#304">304</a>             } <strong>catch</strong> (FileNotFoundException e) {
<a name="305" href="#305">305</a>                 <em class="comment">// TODO Auto-generated catch block</em>
<a name="306" href="#306">306</a>                 e.printStackTrace();
<a name="307" href="#307">307</a>                 <strong>throw</strong> <strong>new</strong> RuntimeException(e);
<a name="308" href="#308">308</a>             }
<a name="309" href="#309">309</a>             diversionLogs.put(target,writer);
<a name="310" href="#310">310</a>         } 
<a name="311" href="#311">311</a>         <strong>return</strong> writer;
<a name="312" href="#312">312</a>     }
<a name="313" href="#313">313</a> 
<a name="314" href="#314">314</a>     <strong>protected</strong> <strong>void</strong> initialTasks() {
<a name="315" href="#315">315</a>         <strong>super</strong>.initialTasks();
<a name="316" href="#316">316</a>         localName = (String) getUncheckedAttribute(<strong>null</strong>, ATTR_LOCAL_NAME);
<a name="317" href="#317">317</a>         cache = <strong>new</strong> <a href="../../../../org/archive/util/fingerprint/ArrayLongFPCache.html">ArrayLongFPCache</a>();
<a name="318" href="#318">318</a>     }
<a name="319" href="#319">319</a> }
</pre>
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