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400 lines
19 KiB
400 lines
19 KiB
// SearchEvent.java
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// (C) 2005 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 10.10.2005 on http://yacy.net
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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//
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// LICENSE
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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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package de.anomic.search;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.TreeMap;
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import java.util.TreeSet;
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import net.yacy.kelondro.data.word.WordReference;
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import net.yacy.kelondro.data.word.WordReferenceVars;
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import net.yacy.kelondro.logging.Log;
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import net.yacy.kelondro.order.Base64Order;
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import net.yacy.kelondro.rwi.ReferenceContainer;
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import net.yacy.kelondro.util.EventTracker;
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import net.yacy.kelondro.util.MemoryControl;
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import net.yacy.kelondro.util.SetTools;
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import de.anomic.crawler.ResultURLs;
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import de.anomic.search.RankingProcess.NavigatorEntry;
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import de.anomic.yacy.yacySearch;
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import de.anomic.yacy.yacySeedDB;
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import de.anomic.yacy.dht.FlatWordPartitionScheme;
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import de.anomic.yacy.graphics.ProfilingGraph;
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public final class SearchEvent {
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public static final String INITIALIZATION = "initialization";
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public static final String COLLECTION = "collection";
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public static final String JOIN = "join";
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public static final String PRESORT = "presort";
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public static final String URLFETCH = "urlfetch";
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public static final String NORMALIZING = "normalizing";
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public static final String FINALIZATION = "finalization";
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private static final int max_results_preparation = 1000;
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// class variables that may be implemented with an abstract class
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private long eventTime;
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private QueryParams query;
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private final yacySeedDB peers;
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private RankingProcess rankedCache; // ordered search results, grows dynamically as all the query threads enrich this container
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private ResultFetcher results;
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// class variables for search abstracts
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private final IndexAbstracts rcAbstracts; // cache for index abstracts; word:TreeMap mapping where the embedded TreeMap is a urlhash:peerlist relation
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// class variables for remote searches
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private yacySearch[] primarySearchThreads, secondarySearchThreads;
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private final TreeMap<byte[], String> preselectedPeerHashes;
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private final ResultURLs crawlResults;
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private final Thread localSearchThread;
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private final TreeMap<byte[], String> IAResults;
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private final TreeMap<byte[], Integer> IACount;
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private byte[] IAmaxcounthash, IAneardhthash;
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private final ReferenceOrder order;
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@SuppressWarnings("unchecked") SearchEvent(final QueryParams query,
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final yacySeedDB peers,
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final ResultURLs crawlResults,
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final TreeMap<byte[], String> preselectedPeerHashes,
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final boolean generateAbstracts) {
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this.eventTime = System.currentTimeMillis(); // for lifetime check
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this.peers = peers;
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this.crawlResults = crawlResults;
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this.query = query;
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this.rcAbstracts = (query.queryHashes.size() > 1) ? new IndexAbstracts() : null; // generate abstracts only for combined searches
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this.primarySearchThreads = null;
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this.secondarySearchThreads = null;
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this.preselectedPeerHashes = preselectedPeerHashes;
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this.IAResults = new TreeMap<byte[], String>(Base64Order.enhancedCoder);
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this.IACount = new TreeMap<byte[], Integer>(Base64Order.enhancedCoder);
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this.IAmaxcounthash = null;
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this.IAneardhthash = null;
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this.localSearchThread = null;
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this.order = new ReferenceOrder(query.ranking, query.targetlang);
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final long start = System.currentTimeMillis();
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if ((query.domType == QueryParams.SEARCHDOM_GLOBALDHT) ||
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(query.domType == QueryParams.SEARCHDOM_CLUSTERALL)) {
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final int fetchpeers = 12;
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// initialize a ranking process that is the target for data
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// that is generated concurrently from local and global search threads
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this.rankedCache = new RankingProcess(this.query, this.order, max_results_preparation, fetchpeers + 1);
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// start a local search concurrently
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this.rankedCache.start();
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// start global searches
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final long timer = System.currentTimeMillis();
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Log.logFine("SEARCH_EVENT", "STARTING " + fetchpeers + " THREADS TO CATCH EACH " + query.displayResults() + " URLs");
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this.primarySearchThreads = (query.queryHashes.isEmpty()) ? null : yacySearch.primaryRemoteSearches(
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QueryParams.hashSet2hashString(query.queryHashes),
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QueryParams.hashSet2hashString(query.excludeHashes),
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"",
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query.prefer,
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query.urlMask,
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query.targetlang == null ? "" : query.targetlang,
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query.sitehash == null ? "" : query.sitehash,
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query.authorhash == null ? "" : query.authorhash,
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query.displayResults(),
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query.maxDistance,
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query.getSegment(),
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peers,
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crawlResults,
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rankedCache,
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rcAbstracts,
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fetchpeers,
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Switchboard.urlBlacklist,
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query.ranking,
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query.constraint,
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(query.domType == QueryParams.SEARCHDOM_GLOBALDHT) ? null : preselectedPeerHashes);
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if (this.primarySearchThreads != null) {
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if (this.primarySearchThreads.length > fetchpeers) this.rankedCache.moreFeeders(this.primarySearchThreads.length - fetchpeers);
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EventTracker.update("SEARCH", new ProfilingGraph.searchEvent(query.id(true), "remote search thread start", this.primarySearchThreads.length, System.currentTimeMillis() - timer), false, 30000, ProfilingGraph.maxTime);
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// finished searching
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Log.logFine("SEARCH_EVENT", "SEARCH TIME AFTER GLOBAL-TRIGGER TO " + primarySearchThreads.length + " PEERS: " + ((System.currentTimeMillis() - start) / 1000) + " seconds");
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} else {
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// no search since query is empty, user might have entered no data or filters have removed all search words
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Log.logFine("SEARCH_EVENT", "NO SEARCH STARTED DUE TO EMPTY SEARCH REQUEST.");
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}
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// start worker threads to fetch urls and snippets
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this.results = new ResultFetcher(rankedCache, query, peers, 10000);
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} else {
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// do a local search
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this.rankedCache = new RankingProcess(this.query, this.order, max_results_preparation, 2);
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this.rankedCache.run();
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//CrawlSwitchboard.Finding finding = wordIndex.retrieveURLs(query, false, 2, ranking, process);
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if (generateAbstracts) {
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// compute index abstracts
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final long timer = System.currentTimeMillis();
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int maxcount = -1;
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long mindhtdistance = Long.MAX_VALUE, l;
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byte[] wordhash;
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assert this.rankedCache.searchContainerMap() != null;
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for (Map.Entry<byte[], ReferenceContainer<WordReference>> entry : this.rankedCache.searchContainerMap().entrySet()) {
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wordhash = entry.getKey();
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final ReferenceContainer container = entry.getValue();
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assert (Base64Order.enhancedCoder.equal(container.getTermHash(), wordhash)) : "container.getTermHash() = " + new String(container.getTermHash()) + ", wordhash = " + new String(wordhash);
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if (container.size() > maxcount) {
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IAmaxcounthash = wordhash;
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maxcount = container.size();
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}
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l = FlatWordPartitionScheme.std.dhtDistance(wordhash, null, peers.mySeed());
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if (l < mindhtdistance) {
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// calculate the word hash that is closest to our dht position
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mindhtdistance = l;
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IAneardhthash = wordhash;
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}
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IACount.put(wordhash, Integer.valueOf(container.size()));
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IAResults.put(wordhash, ReferenceContainer.compressIndex(container, null, 1000).toString());
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}
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EventTracker.update("SEARCH", new ProfilingGraph.searchEvent(query.id(true), "abstract generation", this.rankedCache.searchContainerMap().size(), System.currentTimeMillis() - timer), false, 30000, ProfilingGraph.maxTime);
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}
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// start worker threads to fetch urls and snippets
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this.results = new ResultFetcher(rankedCache, query, peers, 10);
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}
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// clean up events
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SearchEventCache.cleanupEvents(false);
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EventTracker.update("SEARCH", new ProfilingGraph.searchEvent(query.id(true), "event-cleanup", 0, 0), false, 30000, ProfilingGraph.maxTime);
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// store this search to a cache so it can be re-used
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if (MemoryControl.available() < 1024 * 1024 * 10) SearchEventCache.cleanupEvents(true);
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SearchEventCache.put(query.id(false), this);
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}
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public ReferenceOrder getOrder() {
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return this.order;
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}
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public long getEventTime() {
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return this.eventTime;
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}
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public void resetEventTime() {
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this.eventTime = System.currentTimeMillis();
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}
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public QueryParams getQuery() {
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return this.query;
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}
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public void setQuery(QueryParams query) {
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this.query = query;
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this.results.query = query;
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}
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public void cleanup() {
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// execute deletion of failed words
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int rw = this.results.failedURLs.size();
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if (rw > 0) {
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final TreeSet<byte[]> removeWords = query.queryHashes;
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removeWords.addAll(query.excludeHashes);
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try {
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final Iterator<byte[]> j = removeWords.iterator();
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// remove the same url hashes for multiple words
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while (j.hasNext()) {
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this.query.getSegment().termIndex().remove(j.next(), this.results.failedURLs.keySet());
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}
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} catch (IOException e) {
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Log.logException(e);
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}
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Log.logInfo("SearchEvents", "cleaning up event " + query.id(true) + ", removed " + rw + " URL references on " + removeWords.size() + " words");
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}
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}
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public Iterator<Map.Entry<byte[], String>> abstractsString() {
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return this.IAResults.entrySet().iterator();
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}
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public String abstractsString(byte[] hash) {
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return this.IAResults.get(hash);
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}
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public Iterator<Map.Entry<byte[], Integer>> abstractsCount() {
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return this.IACount.entrySet().iterator();
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}
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public int abstractsCount(byte[] hash) {
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Integer i = this.IACount.get(hash);
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if (i == null) return -1;
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return i.intValue();
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}
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public byte[] getAbstractsMaxCountHash() {
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return this.IAmaxcounthash;
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}
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public byte[] getAbstractsNearDHTHash() {
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return this.IAneardhthash;
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}
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boolean anyRemoteSearchAlive() {
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// check primary search threads
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if ((this.primarySearchThreads != null) && (this.primarySearchThreads.length != 0)) {
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for (int i = 0; i < this.primarySearchThreads.length; i++) {
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if ((this.primarySearchThreads[i] != null) && (this.primarySearchThreads[i].isAlive())) return true;
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}
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}
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// maybe a secondary search thread is alive, check this
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if ((this.secondarySearchThreads != null) && (this.secondarySearchThreads.length != 0)) {
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for (int i = 0; i < this.secondarySearchThreads.length; i++) {
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if ((this.secondarySearchThreads[i] != null) && (this.secondarySearchThreads[i].isAlive())) return true;
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}
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}
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return false;
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}
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public yacySearch[] getPrimarySearchThreads() {
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return primarySearchThreads;
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}
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public yacySearch[] getSecondarySearchThreads() {
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return secondarySearchThreads;
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}
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public RankingProcess getRankingResult() {
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return this.rankedCache;
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}
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public ArrayList<NavigatorEntry> getHostNavigator(int maxentries) {
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return this.rankedCache.getHostNavigator(maxentries);
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}
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public ArrayList<NavigatorEntry> getTopicNavigator(final int maxentries) {
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// returns a set of words that are computed as toplist
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return this.rankedCache.getTopicNavigator(maxentries);
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}
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public ArrayList<NavigatorEntry> getAuthorNavigator(final int maxentries) {
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// returns a list of authors so far seen on result set
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return this.rankedCache.getAuthorNavigator(maxentries);
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}
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public ResultEntry oneResult(final int item) {
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if ((query.domType == QueryParams.SEARCHDOM_GLOBALDHT) ||
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(query.domType == QueryParams.SEARCHDOM_CLUSTERALL)) {
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// this is a search using remote search threads. Also the local
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// search thread is started as background process
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if ((localSearchThread != null) && (localSearchThread.isAlive())) {
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// in case that the local search takes longer than some other
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// remote search requests, wait that the local process terminates first
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try {localSearchThread.join();} catch (InterruptedException e) {}
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}
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}
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return this.results.oneResult(item);
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}
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boolean secondarySearchStartet = false;
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void prepareSecondarySearch() {
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if (secondarySearchStartet) return; // don't do this twice
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if ((rcAbstracts == null) || (rcAbstracts.size() != query.queryHashes.size())) return; // secondary search not possible (yet)
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this.secondarySearchStartet = true;
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/*
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// catch up index abstracts and join them; then call peers again to submit their urls
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System.out.println("DEBUG-INDEXABSTRACT: " + rcAbstracts.size() + " word references caught, " + query.queryHashes.size() + " needed");
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Iterator i = rcAbstracts.entrySet().iterator();
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Map.Entry entry;
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while (i.hasNext()) {
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entry = (Map.Entry) i.next();
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System.out.println("DEBUG-INDEXABSTRACT: hash " + (String) entry.getKey() + ": " + ((query.queryHashes.contains((String) entry.getKey())) ? "NEEDED" : "NOT NEEDED") + "; " + ((TreeMap) entry.getValue()).size() + " entries");
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}
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*/
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final TreeMap<String, String> abstractJoin = (rcAbstracts.size() == query.queryHashes.size()) ? SetTools.joinConstructive(rcAbstracts.values(), true) : new TreeMap<String, String>();
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if (!abstractJoin.isEmpty()) {
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//System.out.println("DEBUG-INDEXABSTRACT: index abstracts delivered " + abstractJoin.size() + " additional results for secondary search");
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// generate query for secondary search
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final TreeMap<String, String> secondarySearchURLs = new TreeMap<String, String>(); // a (peerhash:urlhash-liststring) mapping
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Iterator<Map.Entry<String, String>> i1 = abstractJoin.entrySet().iterator();
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Map.Entry<String, String> entry1;
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String url, urls, peer, ps;
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final String mypeerhash = peers.mySeed().hash;
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boolean mypeerinvolved = false;
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int mypeercount;
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while (i1.hasNext()) {
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entry1 = i1.next();
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url = entry1.getKey();
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ps = entry1.getValue();
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//System.out.println("DEBUG-INDEXABSTRACT: url " + url + ": from peers " + peers);
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mypeercount = 0;
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for (int j = 0; j < ps.length(); j = j + 12) {
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peer = ps.substring(j, j + 12);
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if ((peer.equals(mypeerhash)) && (mypeercount++ > 1)) continue;
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//if (peers.indexOf(peer) < j) continue; // avoid doubles that may appear in the abstractJoin
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urls = secondarySearchURLs.get(peer);
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urls = (urls == null) ? url : urls + url;
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secondarySearchURLs.put(peer, urls);
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}
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if (mypeercount == 1) mypeerinvolved = true;
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}
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// compute words for secondary search and start the secondary searches
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i1 = secondarySearchURLs.entrySet().iterator();
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String words;
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secondarySearchThreads = new yacySearch[(mypeerinvolved) ? secondarySearchURLs.size() - 1 : secondarySearchURLs.size()];
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int c = 0;
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while (i1.hasNext()) {
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entry1 = i1.next();
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peer = entry1.getKey();
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if (peer.equals(mypeerhash)) continue; // we dont need to ask ourself
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urls = entry1.getValue();
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words = rcAbstracts.wordsFromPeer(peer, urls);
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assert words.length() >= 12 : "words = " + words;
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//System.out.println("DEBUG-INDEXABSTRACT ***: peer " + peer + " has urls: " + urls);
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//System.out.println("DEBUG-INDEXABSTRACT ***: peer " + peer + " from words: " + words);
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secondarySearchThreads[c++] = yacySearch.secondaryRemoteSearch(
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words, "", urls, this.query.getSegment(), peers, crawlResults, this.rankedCache, peer, Switchboard.urlBlacklist,
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query.ranking, query.constraint, preselectedPeerHashes);
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}
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//} else {
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//System.out.println("DEBUG-INDEXABSTRACT: no success using index abstracts from remote peers");
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}
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}
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public void remove(final WordReferenceVars reference) {
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this.rankedCache.remove(reference);
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}
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public ResultFetcher result() {
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return this.results;
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}
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}
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