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337 lines
15 KiB
337 lines
15 KiB
// plasmaSearchEvent.java
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// -----------------------
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// part of YACY
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2005
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// Created: 10.10.2005
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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package de.anomic.plasma;
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import java.util.Iterator;
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import java.util.Set;
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import java.util.HashSet;
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import java.io.IOException;
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import de.anomic.kelondro.kelondroException;
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import de.anomic.server.logging.serverLog;
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import de.anomic.server.serverInstantThread;
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import de.anomic.yacy.yacySearch;
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import de.anomic.index.indexContainer;
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import de.anomic.index.indexTreeMapContainer;
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import de.anomic.index.indexURLEntry;
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public final class plasmaSearchEvent extends Thread implements Runnable {
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public static plasmaSearchEvent lastEvent = null;
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private static HashSet flushThreads = new HashSet();
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private serverLog log;
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private plasmaSearchQuery query;
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private plasmaSearchRankingProfile ranking;
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private plasmaWordIndex wordIndex;
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private plasmaCrawlLURL urlStore;
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private plasmaSnippetCache snippetCache;
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private indexContainer rcLocal, rcGlobal; // caches for results
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private int rcGlobalCount;
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private plasmaSearchTimingProfile profileLocal, profileGlobal;
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private yacySearch[] searchThreads;
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public plasmaSearchEvent(plasmaSearchQuery query,
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plasmaSearchRankingProfile ranking,
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plasmaSearchTimingProfile localTiming,
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plasmaSearchTimingProfile remoteTiming,
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serverLog log,
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plasmaWordIndex wordIndex,
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plasmaCrawlLURL urlStore,
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plasmaSnippetCache snippetCache) {
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this.log = log;
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this.wordIndex = wordIndex;
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this.query = query;
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this.ranking = ranking;
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this.urlStore = urlStore;
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this.snippetCache = snippetCache;
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this.rcLocal = new indexTreeMapContainer(null);
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this.rcGlobal = new indexTreeMapContainer(null);
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this.rcGlobalCount = 0;
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this.profileLocal = localTiming;
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this.profileGlobal = remoteTiming;
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this.searchThreads = null;
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}
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public plasmaSearchQuery getQuery() {
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return query;
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}
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public plasmaSearchTimingProfile getLocalTiming() {
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return profileLocal;
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}
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public yacySearch[] getSearchThreads() {
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return searchThreads;
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}
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public plasmaSearchResult search() {
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// combine all threads
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// we synchronize with flushThreads to allow only one local search at a time,
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// so all search tasks are queued
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synchronized (flushThreads) {
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if (query.domType == plasmaSearchQuery.SEARCHDOM_GLOBALDHT) {
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int fetchpeers = (int) (query.maximumTime / 500L); // number of target peers; means 10 peers in 10 seconds
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if (fetchpeers > 50) fetchpeers = 50;
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if (fetchpeers < 30) fetchpeers = 30;
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// remember time
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long start = System.currentTimeMillis();
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// first trigger a local search within a separate thread
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serverInstantThread.oneTimeJob(this, "localSearch", log, 0);
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// do a global search
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int globalContributions = globalSearch(fetchpeers);
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log.logFine("SEARCH TIME AFTER GLOBAL-TRIGGER TO " + fetchpeers + " PEERS: " + ((System.currentTimeMillis() - start) / 1000) + " seconds");
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// combine the result and order
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plasmaSearchResult result = order();
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result.globalContributions = globalContributions;
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result.localContributions = rcLocal.size();
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flushGlobalResults(); // make these values available for immediate next search
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// flush results in a separate thread
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this.start(); // start to flush results
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// serverInstantThread.oneTimeJob(this, "flushResults", log, 0);
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// clean up
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rcLocal = null;
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// return search result
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log.logFine("SEARCHRESULT: " + profileLocal.reportToString());
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lastEvent = this;
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return result;
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} else {
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localSearch();
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plasmaSearchResult result = order();
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result.localContributions = rcLocal.size();
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// clean up
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rcLocal = null;
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// return search result
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log.logFine("SEARCHRESULT: " + profileLocal.reportToString());
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lastEvent = this;
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return result;
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}
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}
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}
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public int localSearch() {
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// search for the set of hashes and return an array of urlEntry elements
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// retrieve entities that belong to the hashes
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profileLocal.startTimer();
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Set containers = wordIndex.getContainers(
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query.queryHashes,
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true,
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true,
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profileLocal.getTargetTime(plasmaSearchTimingProfile.PROCESS_COLLECTION));
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if (containers.size() < query.size()) containers = null; // prevent that only a subset is returned
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profileLocal.setYieldTime(plasmaSearchTimingProfile.PROCESS_COLLECTION);
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profileLocal.setYieldCount(plasmaSearchTimingProfile.PROCESS_COLLECTION, (containers == null) ? 0 : containers.size());
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// since this is a conjunction we return an empty entity if any word
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// is not known
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if (containers == null) {
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rcLocal = new indexTreeMapContainer(null);
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return 0;
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}
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// join the result
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profileLocal.startTimer();
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rcLocal = indexTreeMapContainer.joinContainer(containers,
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profileLocal.getTargetTime(plasmaSearchTimingProfile.PROCESS_JOIN),
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query.maxDistance);
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profileLocal.setYieldTime(plasmaSearchTimingProfile.PROCESS_JOIN);
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profileLocal.setYieldCount(plasmaSearchTimingProfile.PROCESS_JOIN, rcLocal.size());
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return rcLocal.size();
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}
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public int globalSearch(int fetchpeers) {
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// do global fetching
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// the result of the fetch is then in the rcGlobal
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if (fetchpeers < 10) fetchpeers = 10;
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log.logFine("STARTING " + fetchpeers + " THREADS TO CATCH EACH " + profileGlobal.getTargetCount(plasmaSearchTimingProfile.PROCESS_POSTSORT) + " URLs WITHIN " + (profileGlobal.duetime() / 1000) + " SECONDS");
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long timeout = System.currentTimeMillis() + profileGlobal.duetime() + 4000;
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searchThreads = yacySearch.searchHashes(query.queryHashes, query.prefer, query.urlMask, query.maxDistance, urlStore, rcGlobal, fetchpeers, plasmaSwitchboard.urlBlacklist, snippetCache, profileGlobal, ranking);
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// wait until wanted delay passed or wanted result appeared
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while (System.currentTimeMillis() < timeout) {
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// check if all threads have been finished or results so far are enough
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if (rcGlobal.size() >= profileGlobal.getTargetCount(plasmaSearchTimingProfile.PROCESS_POSTSORT) * 5) break; // we have enough
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if (yacySearch.remainingWaiting(searchThreads) == 0) break; // we cannot expect more
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// wait a little time ..
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try {Thread.sleep(100);} catch (InterruptedException e) {}
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}
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return rcGlobal.size();
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}
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public plasmaSearchResult order() {
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// we collect the urlhashes and construct a list with urlEntry objects
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// attention: if minEntries is too high, this method will not terminate within the maxTime
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indexTreeMapContainer searchResult = new indexTreeMapContainer(null);
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long preorderTime = profileLocal.getTargetTime(plasmaSearchTimingProfile.PROCESS_PRESORT);
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profileLocal.startTimer();
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long pst = System.currentTimeMillis();
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searchResult.add(rcLocal, preorderTime);
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searchResult.add(rcGlobal, preorderTime);
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preorderTime = preorderTime - (System.currentTimeMillis() - pst);
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if (preorderTime < 0) preorderTime = 200;
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plasmaSearchPreOrder preorder = new plasmaSearchPreOrder(query, ranking);
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preorder.addContainer(searchResult, preorderTime);
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profileLocal.setYieldTime(plasmaSearchTimingProfile.PROCESS_PRESORT);
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profileLocal.setYieldCount(plasmaSearchTimingProfile.PROCESS_PRESORT, rcLocal.size());
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// start url-fetch
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long postorderTime = profileLocal.getTargetTime(plasmaSearchTimingProfile.PROCESS_POSTSORT);
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long postorderLimitTime = (postorderTime < 0) ? Long.MAX_VALUE : (System.currentTimeMillis() + postorderTime);
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profileLocal.startTimer();
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plasmaSearchResult acc = new plasmaSearchResult(query, ranking);
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//if (searchResult == null) return acc; // strange case where searchResult is not proper: acc is then empty
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//if (searchResult.size() == 0) return acc; // case that we have nothing to do
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indexURLEntry entry;
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plasmaCrawlLURL.Entry page;
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int minEntries = profileLocal.getTargetCount(plasmaSearchTimingProfile.PROCESS_POSTSORT);
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try {
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while (preorder.hasNext()) {
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if ((acc.sizeFetched() >= 50) && ((acc.sizeFetched() >= minEntries) || (System.currentTimeMillis() >= postorderLimitTime))) break;
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entry = preorder.next();
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// find the url entry
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try {
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page = urlStore.getEntry(entry.getUrlHash(), entry);
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// add a result
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acc.addResult(entry, page);
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} catch (IOException e) {
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// result was not found
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}
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}
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} catch (kelondroException ee) {
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serverLog.logSevere("PLASMA", "Database Failure during plasmaSearch.order: " + ee.getMessage(), ee);
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}
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profileLocal.setYieldTime(plasmaSearchTimingProfile.PROCESS_URLFETCH);
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profileLocal.setYieldCount(plasmaSearchTimingProfile.PROCESS_URLFETCH, acc.sizeFetched());
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// start postsorting
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profileLocal.startTimer();
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acc.sortResults();
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profileLocal.setYieldTime(plasmaSearchTimingProfile.PROCESS_POSTSORT);
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profileLocal.setYieldCount(plasmaSearchTimingProfile.PROCESS_POSTSORT, acc.sizeOrdered());
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// apply filter
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profileLocal.startTimer();
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//acc.removeRedundant();
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acc.removeDoubleDom();
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profileLocal.setYieldTime(plasmaSearchTimingProfile.PROCESS_FILTER);
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profileLocal.setYieldCount(plasmaSearchTimingProfile.PROCESS_FILTER, acc.sizeOrdered());
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return acc;
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}
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public void run() {
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flushThreads.add(this); // this will care that the search event object is referenced from somewhere while it is still alive
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// put all new results into wordIndex
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// this must be called after search results had been computed
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// it is wise to call this within a separate thread because
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// this method waits until all threads are finished
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int remaining;
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long starttime = System.currentTimeMillis();
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while ((searchThreads != null) && ((remaining = yacySearch.remainingWaiting(searchThreads)) > 0)) {
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flushGlobalResults();
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// wait a little bit before trying again
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try {Thread.sleep(3000);} catch (InterruptedException e) {}
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if (System.currentTimeMillis() - starttime > 90000) {
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yacySearch.interruptAlive(searchThreads);
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log.logFine("SEARCH FLUSH: " + remaining + " PEERS STILL BUSY; ABANDONED; SEARCH WAS " + query.queryWords);
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break;
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}
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log.logFine("FINISHED FLUSH RESULTS PROCESS for query " + query.hashes(","));
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}
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serverLog.logFine("PLASMA", "FINISHED FLUSHING " + rcGlobalCount + " GLOBAL SEARCH RESULTS FOR SEARCH " + query.queryWords);
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// finally delete the temporary index
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rcGlobal = null;
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flushThreads.remove(this);
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}
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public void flushGlobalResults() {
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// flush the rcGlobal as much as is there so far
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// this must be called sometime after search results had been computed
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int count = 0;
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if ((rcGlobal != null) && (rcGlobal.size() > 0)) {
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synchronized (rcGlobal) {
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String wordHash;
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Iterator hashi = query.queryHashes.iterator();
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while (hashi.hasNext()) {
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wordHash = (String) hashi.next();
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rcGlobal.setWordHash(wordHash);
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wordIndex.addEntries(rcGlobal, System.currentTimeMillis(), false);
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log.logFine("FLUSHED " + wordHash + ": " + rcGlobal.size() + " url entries");
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}
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// the rcGlobal was flushed, empty it
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count += rcGlobal.size();
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rcGlobal.clear();
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}
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}
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rcGlobalCount += count;
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}
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}
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