// plasmaSearchEvent.java
// (C) 2005 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
// first published 10.10.2005 on http://yacy.net
//
// This is a part of YaCy, a peer-to-peer based web search engine
//
// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
// $LastChangedRevision: 1986 $
// $LastChangedBy: orbiter $
//
// LICENSE
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package de.anomic.plasma;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.concurrent.ConcurrentHashMap;
import de.anomic.crawler.ResultURLs;
import de.anomic.kelondro.order.Base64Order;
import de.anomic.kelondro.order.Bitfield;
import de.anomic.kelondro.text.Reference;
import de.anomic.kelondro.text.ReferenceContainer;
import de.anomic.kelondro.text.Segment;
import de.anomic.kelondro.text.metadataPrototype.URLMetadataRow;
import de.anomic.kelondro.text.referencePrototype.WordReference;
import de.anomic.kelondro.text.referencePrototype.WordReferenceVars;
import de.anomic.kelondro.util.MemoryControl;
import de.anomic.kelondro.util.SetTools;
import de.anomic.kelondro.util.SortStack;
import de.anomic.kelondro.util.SortStore;
import de.anomic.plasma.parser.Word;
import de.anomic.plasma.parser.Condenser;
import de.anomic.plasma.plasmaSearchRankingProcess.NavigatorEntry;
import de.anomic.plasma.plasmaSnippetCache.MediaSnippet;
import de.anomic.search.Query;
import de.anomic.server.serverProfiling;
import de.anomic.yacy.yacySearch;
import de.anomic.yacy.yacySeed;
import de.anomic.yacy.yacySeedDB;
import de.anomic.yacy.yacyURL;
import de.anomic.yacy.dht.FlatWordPartitionScheme;
import de.anomic.yacy.logging.Log;
public final class plasmaSearchEvent {
public static final String INITIALIZATION = "initialization";
public static final String COLLECTION = "collection";
public static final String JOIN = "join";
public static final String PRESORT = "presort";
public static final String URLFETCH = "urlfetch";
public static final String NORMALIZING = "normalizing";
public static final String FINALIZATION = "finalization";
private final static int workerThreadCount = 10;
public static String lastEventID = "";
private static ConcurrentHashMap<String, plasmaSearchEvent> lastEvents = new ConcurrentHashMap<String, plasmaSearchEvent>(); // a cache for objects from this class: re-use old search requests
public static final long eventLifetime = 60000; // the time an event will stay in the cache, 1 Minute
private static final int max_results_preparation = 1000;
private long eventTime;
Query query;
private final Segment indexSegment;
private final yacySeedDB peers;
plasmaSearchRankingProcess rankedCache; // ordered search results, grows dynamically as all the query threads enrich this container
private final Map<String, TreeMap<String, String>> rcAbstracts; // cache for index abstracts; word:TreeMap mapping where the embedded TreeMap is a urlhash:peerlist relation
private yacySearch[] primarySearchThreads, secondarySearchThreads;
private Thread localSearchThread;
private final TreeMap<byte[], String> preselectedPeerHashes;
//private Object[] references;
public TreeMap<byte[], String> IAResults;
public TreeMap<byte[], Integer> IACount;
public byte[] IAmaxcounthash, IAneardhthash;
private resultWorker[] workerThreads;
SortStore<ResultEntry> result;
SortStore<plasmaSnippetCache.MediaSnippet> images; // container to sort images by size
HashMap<String, String> failedURLs; // a mapping from a urlhash to a fail reason string
TreeSet<byte[]> snippetFetchWordHashes; // a set of word hashes that are used to match with the snippets
long urlRetrievalAllTime;
long snippetComputationAllTime;
public ResultURLs crawlResults;
@SuppressWarnings("unchecked")
private plasmaSearchEvent(final Query query,
final Segment indexSegment,
final yacySeedDB peers,
final ResultURLs crawlResults,
final TreeMap<byte[], String> preselectedPeerHashes,
final boolean generateAbstracts) {
this.eventTime = System.currentTimeMillis(); // for lifetime check
this.indexSegment = indexSegment;
this.peers = peers;
this.crawlResults = crawlResults;
this.query = query;
this.rcAbstracts = (query.queryHashes.size() > 1) ? new TreeMap<String, TreeMap<String, String>>() : null; // generate abstracts only for combined searches
this.primarySearchThreads = null;
this.secondarySearchThreads = null;
this.preselectedPeerHashes = preselectedPeerHashes;
this.IAResults = new TreeMap<byte[], String>(Base64Order.enhancedCoder);
this.IACount = new TreeMap<byte[], Integer>(Base64Order.enhancedCoder);
this.IAmaxcounthash = null;
this.IAneardhthash = null;
this.urlRetrievalAllTime = 0;
this.snippetComputationAllTime = 0;
this.workerThreads = null;
this.localSearchThread = null;
this.result = new SortStore<ResultEntry>(-1); // this is the result, enriched with snippets, ranked and ordered by ranking
this.images = new SortStore<plasmaSnippetCache.MediaSnippet>(-1);
this.failedURLs = new HashMap<String, String>(); // a map of urls to reason strings where a worker thread tried to work on, but failed.
// snippets do not need to match with the complete query hashes,
// only with the query minus the stopwords which had not been used for the search
final TreeSet<byte[]> filtered = SetTools.joinConstructive(query.queryHashes, plasmaSwitchboard.stopwordHashes);
this.snippetFetchWordHashes = (TreeSet<byte[]>) query.queryHashes.clone();
if ((filtered != null) && (filtered.size() > 0)) {
SetTools.excludeDestructive(this.snippetFetchWordHashes, plasmaSwitchboard.stopwordHashes);
}
final long start = System.currentTimeMillis();
if ((query.domType == Query.SEARCHDOM_GLOBALDHT) ||
(query.domType == Query.SEARCHDOM_CLUSTERALL)) {
// initialize a ranking process that is the target for data
// that is generated concurrently from local and global search threads
this.rankedCache = new plasmaSearchRankingProcess(indexSegment, query, max_results_preparation, 16);
// start a local search
localSearchThread = new localSearchProcess();
localSearchThread.start();
// start global searches
final long timer = System.currentTimeMillis();
final int fetchpeers = 12;
Log.logFine("SEARCH_EVENT", "STARTING " + fetchpeers + " THREADS TO CATCH EACH " + query.displayResults() + " URLs");
this.primarySearchThreads = yacySearch.primaryRemoteSearches(
Query.hashSet2hashString(query.queryHashes),
Query.hashSet2hashString(query.excludeHashes),
"",
query.prefer,
query.urlMask,
query.targetlang == null ? "" : query.targetlang,
query.sitehash == null ? "" : query.sitehash,
query.authorhash == null ? "" : query.authorhash,
query.displayResults(),
query.maxDistance,
indexSegment,
peers,
crawlResults,
rankedCache,
rcAbstracts,
fetchpeers,
plasmaSwitchboard.urlBlacklist,
query.ranking,
query.constraint,
(query.domType == Query.SEARCHDOM_GLOBALDHT) ? null : preselectedPeerHashes);
serverProfiling.update("SEARCH", new plasmaProfiling.searchEvent(query.id(true), "remote search thread start", this.primarySearchThreads.length, System.currentTimeMillis() - timer), false);
// finished searching
Log.logFine("SEARCH_EVENT", "SEARCH TIME AFTER GLOBAL-TRIGGER TO " + primarySearchThreads.length + " PEERS: " + ((System.currentTimeMillis() - start) / 1000) + " seconds");
} else {
// do a local search
this.rankedCache = new plasmaSearchRankingProcess(indexSegment, query, max_results_preparation, 2);
this.rankedCache.execQuery();
//CrawlSwitchboard.Finding finding = wordIndex.retrieveURLs(query, false, 2, ranking, process);
if (generateAbstracts) {
// compute index abstracts
final long timer = System.currentTimeMillis();
int maxcount = -1;
long mindhtdistance = Long.MAX_VALUE, l;
byte[] wordhash;
assert this.rankedCache.searchContainerMap() != null;
for (Map.Entry<byte[], ReferenceContainer<WordReference>> entry : this.rankedCache.searchContainerMap().entrySet()) {
wordhash = entry.getKey();
final ReferenceContainer container = entry.getValue();
assert (container.getTermHash().equals(wordhash));
if (container.size() > maxcount) {
IAmaxcounthash = wordhash;
maxcount = container.size();
}
l = FlatWordPartitionScheme.std.dhtDistance(wordhash, null, peers.mySeed());
if (l < mindhtdistance) {
// calculate the word hash that is closest to our dht position
mindhtdistance = l;
IAneardhthash = wordhash;
}
IACount.put(wordhash, Integer.valueOf(container.size()));
IAResults.put(wordhash, ReferenceContainer.compressIndex(container, null, 1000).toString());
}
serverProfiling.update("SEARCH", new plasmaProfiling.searchEvent(query.id(true), "abstract generation", this.rankedCache.searchContainerMap().size(), System.currentTimeMillis() - timer), false);
}
}
// start worker threads to fetch urls and snippets
this.workerThreads = new resultWorker[(query.onlineSnippetFetch) ? workerThreadCount : 1];
for (int i = 0; i < this.workerThreads.length; i++) {
this.workerThreads[i] = new resultWorker(i, 10000, (query.onlineSnippetFetch) ? 2 : 0);
this.workerThreads[i].start();
}
serverProfiling.update("SEARCH", new plasmaProfiling.searchEvent(query.id(true), this.workerThreads.length + " online snippet fetch threads started", 0, 0), false);
// clean up events
cleanupEvents(false);
serverProfiling.update("SEARCH", new plasmaProfiling.searchEvent(query.id(true), "event-cleanup", 0, 0), false);
// store this search to a cache so it can be re-used
if (MemoryControl.available() < 1024 * 1024 * 10) cleanupEvents(true);
lastEventID = query.id(false);
lastEvents.put(lastEventID, this);
}
private class localSearchProcess extends Thread {
public localSearchProcess() {
}
public void run() {
// do a local search
// sort the local containers and truncate it to a limited count,
// so following sortings together with the global results will be fast
try {
rankedCache.execQuery();
} catch (final Exception e) {
e.printStackTrace();
}
}
}
public static void cleanupEvents(final boolean all) {
// remove old events in the event cache
final Iterator<plasmaSearchEvent> i = lastEvents.values().iterator();
plasmaSearchEvent cleanEvent;
while (i.hasNext()) {
cleanEvent = i.next();
if ((all) || (cleanEvent.eventTime + eventLifetime < System.currentTimeMillis())) {
// execute deletion of failed words
int rw = cleanEvent.failedURLs.size();
if (rw > 0) {
final TreeSet<byte[]> removeWords = cleanEvent.query.queryHashes;
removeWords.addAll(cleanEvent.query.excludeHashes);
try {
final Iterator<byte[]> j = removeWords.iterator();
// remove the same url hashes for multiple words
while (j.hasNext()) {
cleanEvent.indexSegment.termIndex().remove(j.next(), cleanEvent.failedURLs.keySet());
}
} catch (IOException e) {
e.printStackTrace();
}
Log.logInfo("SearchEvents", "cleaning up event " + cleanEvent.query.id(true) + ", removed " + rw + " URL references on " + removeWords.size() + " words");
}
// remove the event
i.remove();
}
}
}
ResultEntry obtainResultEntry(final URLMetadataRow page, final int snippetFetchMode) {
// a search result entry needs some work to produce a result Entry:
// - check if url entry exists in LURL-db
// - check exclusions, constraints, masks, media-domains
// - load snippet (see if page exists) and check if snippet contains searched word
// Snippet Fetching can has 3 modes:
// 0 - do not fetch snippets
// 1 - fetch snippets offline only
// 2 - online snippet fetch
// load only urls if there was not yet a root url of that hash
// find the url entry
long startTime = System.currentTimeMillis();
final URLMetadataRow.Components metadata = page.metadata();
final String pagetitle = metadata.dc_title().toLowerCase();
if (metadata.url() == null) {
registerFailure(page.hash(), "url corrupted (null)");
return null; // rare case where the url is corrupted
}
final String pageurl = metadata.url().toString().toLowerCase();
final String pageauthor = metadata.dc_creator().toLowerCase();
final long dbRetrievalTime = System.currentTimeMillis() - startTime;
// check exclusion
if ((Query.matches(pagetitle, query.excludeHashes)) ||
(Query.matches(pageurl, query.excludeHashes)) ||
(Query.matches(pageauthor, query.excludeHashes))) {
return null;
}
// check url mask
if (!(pageurl.matches(query.urlMask))) {
return null;
}
// check constraints
if ((query.constraint != null) &&
(query.constraint.get(Condenser.flag_cat_indexof)) &&
(!(metadata.dc_title().startsWith("Index of")))) {
final Iterator<byte[]> wi = query.queryHashes.iterator();
while (wi.hasNext()) try { indexSegment.termIndex().remove(wi.next(), page.hash()); } catch (IOException e) {}
registerFailure(page.hash(), "index-of constraint not fullfilled");
return null;
}
if ((query.contentdom == Query.CONTENTDOM_AUDIO) && (page.laudio() == 0)) {
registerFailure(page.hash(), "contentdom-audio constraint not fullfilled");
return null;
}
if ((query.contentdom == Query.CONTENTDOM_VIDEO) && (page.lvideo() == 0)) {
registerFailure(page.hash(), "contentdom-video constraint not fullfilled");
return null;
}
if ((query.contentdom == Query.CONTENTDOM_IMAGE) && (page.limage() == 0)) {
registerFailure(page.hash(), "contentdom-image constraint not fullfilled");
return null;
}
if ((query.contentdom == Query.CONTENTDOM_APP) && (page.lapp() == 0)) {
registerFailure(page.hash(), "contentdom-app constraint not fullfilled");
return null;
}
if (snippetFetchMode == 0) {
return new ResultEntry(page, indexSegment, peers, null, null, dbRetrievalTime, 0); // result without snippet
}
// load snippet
if (query.contentdom == Query.CONTENTDOM_TEXT) {
// attach text snippet
startTime = System.currentTimeMillis();
final plasmaSnippetCache.TextSnippet snippet = plasmaSnippetCache.retrieveTextSnippet(metadata, snippetFetchWordHashes, (snippetFetchMode == 2), ((query.constraint != null) && (query.constraint.get(Condenser.flag_cat_indexof))), 180, (snippetFetchMode == 2) ? Integer.MAX_VALUE : 30000, query.isGlobal());
final long snippetComputationTime = System.currentTimeMillis() - startTime;
Log.logInfo("SEARCH_EVENT", "text snippet load time for " + metadata.url() + ": " + snippetComputationTime + ", " + ((snippet.getErrorCode() < 11) ? "snippet found" : ("no snippet found (" + snippet.getError() + ")")));
if (snippet.getErrorCode() < 11) {
// we loaded the file and found the snippet
return new ResultEntry(page, indexSegment, peers, snippet, null, dbRetrievalTime, snippetComputationTime); // result with snippet attached
} else if (snippetFetchMode == 1) {
// we did not demand online loading, therefore a failure does not mean that the missing snippet causes a rejection of this result
// this may happen during a remote search, because snippet loading is omitted to retrieve results faster
return new ResultEntry(page, indexSegment, peers, null, null, dbRetrievalTime, snippetComputationTime); // result without snippet
} else {
// problems with snippet fetch
registerFailure(page.hash(), "no text snippet for URL " + metadata.url());
if (!peers.mySeed().isVirgin())
try {
plasmaSnippetCache.failConsequences(snippet, query.id(false));
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
} else {
// attach media information
startTime = System.currentTimeMillis();
final ArrayList<MediaSnippet> mediaSnippets = plasmaSnippetCache.retrieveMediaSnippets(metadata.url(), snippetFetchWordHashes, query.contentdom, (snippetFetchMode == 2), 6000, query.isGlobal());
final long snippetComputationTime = System.currentTimeMillis() - startTime;
Log.logInfo("SEARCH_EVENT", "media snippet load time for " + metadata.url() + ": " + snippetComputationTime);
if ((mediaSnippets != null) && (mediaSnippets.size() > 0)) {
// found media snippets, return entry
return new ResultEntry(page, indexSegment, peers, null, mediaSnippets, dbRetrievalTime, snippetComputationTime);
} else if (snippetFetchMode == 1) {
return new ResultEntry(page, indexSegment, peers, null, null, dbRetrievalTime, snippetComputationTime);
} else {
// problems with snippet fetch
registerFailure(page.hash(), "no media snippet for URL " + metadata.url());
return null;
}
}
// finished, no more actions possible here
}
private boolean anyWorkerAlive() {
if (this.workerThreads == null) return false;
for (int i = 0; i < this.workerThreads.length; i++) {
if ((this.workerThreads[i] != null) &&
(this.workerThreads[i].isAlive()) &&
(this.workerThreads[i].busytime() < 3000)) return true;
}
return false;
}
boolean anyRemoteSearchAlive() {
// check primary search threads
if ((this.primarySearchThreads != null) && (this.primarySearchThreads.length != 0)) {
for (int i = 0; i < this.primarySearchThreads.length; i++) {
if ((this.primarySearchThreads[i] != null) && (this.primarySearchThreads[i].isAlive())) return true;
}
}
// maybe a secondary search thread is alive, check this
if ((this.secondarySearchThreads != null) && (this.secondarySearchThreads.length != 0)) {
for (int i = 0; i < this.secondarySearchThreads.length; i++) {
if ((this.secondarySearchThreads[i] != null) && (this.secondarySearchThreads[i].isAlive())) return true;
}
}
return false;
}
private int countFinishedRemoteSearch() {
int count = 0;
// check only primary search threads
if ((this.primarySearchThreads != null) && (this.primarySearchThreads.length != 0)) {
for (int i = 0; i < this.primarySearchThreads.length; i++) {
if ((this.primarySearchThreads[i] == null) || (!(this.primarySearchThreads[i].isAlive()))) count++;
}
}
return count;
}
public Query getQuery() {
return query;
}
public yacySearch[] getPrimarySearchThreads() {
return primarySearchThreads;
}
public yacySearch[] getSecondarySearchThreads() {
return secondarySearchThreads;
}
public plasmaSearchRankingProcess getRankingResult() {
return this.rankedCache;
}
public long getURLRetrievalTime() {
return this.urlRetrievalAllTime;
}
public long getSnippetComputationTime() {
return this.snippetComputationAllTime;
}
public static plasmaSearchEvent getEvent(final String eventID) {
return lastEvents.get(eventID);
}
public static plasmaSearchEvent getEvent(
final Query query,
final Segment indexSegment,
final yacySeedDB peers,
final ResultURLs crawlResults,
final TreeMap<byte[], String> preselectedPeerHashes,
final boolean generateAbstracts) {
String id = query.id(false);
plasmaSearchEvent event = lastEvents.get(id);
if (plasmaSwitchboard.getSwitchboard().crawlQueues.noticeURL.size() > 0 && event != null && System.currentTimeMillis() - event.eventTime > 60000) {
// if a local crawl is ongoing, don't use the result from the cache to use possibly more results that come from the current crawl
// to prevent that this happens during a person switches between the different result pages, a re-search happens no more than
// once a minute
lastEvents.remove(id);
event = null;
} else {
if (event != null) {
//re-new the event time for this event, so it is not deleted next time too early
event.eventTime = System.currentTimeMillis();
// replace the query, because this contains the current result offset
event.query = query;
}
}
if (event == null) {
// generate a new event
event = new plasmaSearchEvent(query, indexSegment, peers, crawlResults, preselectedPeerHashes, generateAbstracts);
} else {
// if worker threads had been alive, but did not succeed, start them again to fetch missing links
if ((!event.anyWorkerAlive()) &&
(((query.contentdom == Query.CONTENTDOM_IMAGE) && (event.images.size() + 30 < query.neededResults())) ||
(event.result.size() < query.neededResults() + 10)) &&
//(event.query.onlineSnippetFetch) &&
(event.getRankingResult().getLocalResourceSize() + event.getRankingResult().getRemoteResourceSize() > event.result.size())) {
// set new timeout
event.eventTime = System.currentTimeMillis();
// start worker threads to fetch urls and snippets
event.workerThreads = new resultWorker[workerThreadCount];
resultWorker worker;
for (int i = 0; i < event.workerThreads.length; i++) {
worker = event.new resultWorker(i, 6000, (query.onlineSnippetFetch) ? 2 : 0);
worker.start();
event.workerThreads[i] = worker;
}
}
}
return event;
}
private class resultWorker extends Thread {
private final long timeout; // the date until this thread should try to work
private long lastLifeSign; // when the last time the run()-loop was executed
private final int id;
private int snippetMode;
public resultWorker(final int id, final long maxlifetime, int snippetMode) {
this.id = id;
this.snippetMode = snippetMode;
this.lastLifeSign = System.currentTimeMillis();
this.timeout = System.currentTimeMillis() + Math.max(1000, maxlifetime);
}
public void run() {
// start fetching urls and snippets
URLMetadataRow page;
final int fetchAhead = snippetMode == 0 ? 0 : 10;
boolean nav_topics = query.navigators.equals("all") || query.navigators.indexOf("topics") >= 0;
try {
while (System.currentTimeMillis() < this.timeout) {
this.lastLifeSign = System.currentTimeMillis();
// check if we have enough
if ((query.contentdom == Query.CONTENTDOM_IMAGE) && (images.size() >= query.neededResults() + fetchAhead)) break;
if ((query.contentdom != Query.CONTENTDOM_IMAGE) && (result.size() >= query.neededResults() + fetchAhead)) break;
// get next entry
page = rankedCache.bestURL(true);
if (page == null) {
if (!anyRemoteSearchAlive()) break; // we cannot expect more results
// if we did not get another entry, sleep some time and try again
try {Thread.sleep(10);} catch (final InterruptedException e1) {}
continue;
}
if (result.exists(page.hash().hashCode())) continue;
if (failedURLs.get(page.hash()) != null) continue;
// try secondary search
prepareSecondarySearch(); // will be executed only once
final ResultEntry resultEntry = obtainResultEntry(page, snippetMode);
if (resultEntry == null) continue; // the entry had some problems, cannot be used
urlRetrievalAllTime += resultEntry.dbRetrievalTime;
snippetComputationAllTime += resultEntry.snippetComputationTime;
//System.out.println("+++DEBUG-resultWorker+++ fetched " + resultEntry.urlstring());
// place the result to the result vector
if (!result.exists(resultEntry)) {
result.push(resultEntry, Long.valueOf(rankedCache.getOrder().cardinal(resultEntry.word())));
if (nav_topics) rankedCache.addTopics(resultEntry);
}
//System.out.println("DEBUG SNIPPET_LOADING: thread " + id + " got " + resultEntry.url());
}
} catch (final Exception e) {
e.printStackTrace();
}
Log.logInfo("SEARCH", "resultWorker thread " + id + " terminated");
}
public long busytime() {
return System.currentTimeMillis() - this.lastLifeSign;
}
}
private void registerFailure(final String urlhash, final String reason) {
this.failedURLs.put(urlhash, reason);
Log.logInfo("search", "sorted out hash " + urlhash + " during search: " + reason);
}
public ArrayList<NavigatorEntry> getHostNavigator(int maxentries) {
return this.rankedCache.getHostNavigator(maxentries);
}
public ArrayList<NavigatorEntry> getTopicNavigator(final int maxentries) {
// returns a set of words that are computed as toplist
return this.rankedCache.getTopicNavigator(maxentries);
}
public ArrayList<NavigatorEntry> getAuthorNavigator(final int maxentries) {
// returns a list of authors so far seen on result set
return this.rankedCache.getAuthorNavigator(maxentries);
}
public ResultEntry oneResult(final int item) {
// check if we already retrieved this item (happens if a search
// pages is accessed a second time)
serverProfiling.update("SEARCH", new plasmaProfiling.searchEvent(query.id(true), "obtain one result entry - start", 0, 0), false);
if (this.result.sizeStore() > item) {
// we have the wanted result already in the result array .. return that
return this.result.element(item).element;
}
if ((query.domType == Query.SEARCHDOM_GLOBALDHT) ||
(query.domType == Query.SEARCHDOM_CLUSTERALL)) {
// this is a search using remote search threads. Also the local
// search thread is started as background process
if ((localSearchThread != null) && (localSearchThread.isAlive())) {
// in case that the local search takes longer than some other
// remote search requests, wait that the local process terminates first
try {localSearchThread.join();} catch (InterruptedException e) {}
}
// now wait until as many remote worker threads have finished, as we
// want to display results
while (this.primarySearchThreads != null &&
this.primarySearchThreads.length > item &&
anyWorkerAlive() &&
(result.size() <= item || countFinishedRemoteSearch() <= item)) {
try {Thread.sleep(item * 50L);} catch (final InterruptedException e) {}
}
}
// finally wait until enough results are there produced from the
// snippet fetch process
while ((anyWorkerAlive()) && (result.size() <= item)) {
try {Thread.sleep(item * 50L);} catch (final InterruptedException e) {}
}
// finally, if there is something, return the result
if (this.result.size() <= item) return null;
return this.result.element(item).element;
}
private int resultCounter = 0;
public ResultEntry nextResult() {
final ResultEntry re = oneResult(resultCounter);
resultCounter++;
return re;
}
public plasmaSnippetCache.MediaSnippet oneImage(final int item) {
// check if we already retrieved this item (happens if a search pages is accessed a second time)
if (this.images.sizeStore() > item) {
// we have the wanted result already in the result array .. return that
return this.images.element(item).element;
}
// feed some results from the result stack into the image stack
final int count = Math.min(5, Math.max(1, 10 * this.result.size() / (item + 1)));
for (int i = 0; i < count; i++) {
// generate result object
final plasmaSearchEvent.ResultEntry result = nextResult();
plasmaSnippetCache.MediaSnippet ms;
if (result != null) {
// iterate over all images in the result
final ArrayList<plasmaSnippetCache.MediaSnippet> imagemedia = result.mediaSnippets();
if (imagemedia != null) {
for (int j = 0; j < imagemedia.size(); j++) {
ms = imagemedia.get(j);
images.push(ms, Long.valueOf(ms.ranking));
}
}
}
}
// now take the specific item from the image stack
if (this.images.size() <= item) return null;
return this.images.element(item).element;
}
public ArrayList<SortStack<ResultEntry>.stackElement> completeResults(final long waitingtime) {
final long timeout = System.currentTimeMillis() + waitingtime;
while ((result.size() < query.neededResults()) && (anyWorkerAlive()) && (System.currentTimeMillis() < timeout)) {
try {Thread.sleep(100);} catch (final InterruptedException e) {}
//System.out.println("+++DEBUG-completeResults+++ sleeping " + 200);
}
return this.result.list(this.result.size());
}
boolean secondarySearchStartet = false;
void prepareSecondarySearch() {
if (secondarySearchStartet) return; // don't do this twice
if ((rcAbstracts == null) || (rcAbstracts.size() != query.queryHashes.size())) return; // secondary search not possible (yet)
this.secondarySearchStartet = true;
/*
// catch up index abstracts and join them; then call peers again to submit their urls
System.out.println("DEBUG-INDEXABSTRACT: " + rcAbstracts.size() + " word references caught, " + query.queryHashes.size() + " needed");
Iterator i = rcAbstracts.entrySet().iterator();
Map.Entry entry;
while (i.hasNext()) {
entry = (Map.Entry) i.next();
System.out.println("DEBUG-INDEXABSTRACT: hash " + (String) entry.getKey() + ": " + ((query.queryHashes.contains((String) entry.getKey())) ? "NEEDED" : "NOT NEEDED") + "; " + ((TreeMap) entry.getValue()).size() + " entries");
}
*/
final TreeMap<String, String> abstractJoin = (rcAbstracts.size() == query.queryHashes.size()) ? SetTools.joinConstructive(rcAbstracts.values(), true) : new TreeMap<String, String>();
if (abstractJoin.size() != 0) {
//System.out.println("DEBUG-INDEXABSTRACT: index abstracts delivered " + abstractJoin.size() + " additional results for secondary search");
// generate query for secondary search
final TreeMap<String, String> secondarySearchURLs = new TreeMap<String, String>(); // a (peerhash:urlhash-liststring) mapping
Iterator<Map.Entry<String, String>> i1 = abstractJoin.entrySet().iterator();
Map.Entry<String, String> entry1;
String url, urls, peer, ps;
final String mypeerhash = peers.mySeed().hash;
boolean mypeerinvolved = false;
int mypeercount;
while (i1.hasNext()) {
entry1 = i1.next();
url = entry1.getKey();
ps = entry1.getValue();
//System.out.println("DEBUG-INDEXABSTRACT: url " + url + ": from peers " + peers);
mypeercount = 0;
for (int j = 0; j < ps.length(); j = j + 12) {
peer = ps.substring(j, j + 12);
if ((peer.equals(mypeerhash)) && (mypeercount++ > 1)) continue;
//if (peers.indexOf(peer) < j) continue; // avoid doubles that may appear in the abstractJoin
urls = secondarySearchURLs.get(peer);
urls = (urls == null) ? url : urls + url;
secondarySearchURLs.put(peer, urls);
}
if (mypeercount == 1) mypeerinvolved = true;
}
// compute words for secondary search and start the secondary searches
i1 = secondarySearchURLs.entrySet().iterator();
String words;
secondarySearchThreads = new yacySearch[(mypeerinvolved) ? secondarySearchURLs.size() - 1 : secondarySearchURLs.size()];
int c = 0;
while (i1.hasNext()) {
entry1 = i1.next();
peer = entry1.getKey();
if (peer.equals(mypeerhash)) continue; // we dont need to ask ourself
urls = entry1.getValue();
words = wordsFromPeer(peer, urls);
assert words.length() >= 12 : "words = " + words;
//System.out.println("DEBUG-INDEXABSTRACT ***: peer " + peer + " has urls: " + urls);
//System.out.println("DEBUG-INDEXABSTRACT ***: peer " + peer + " from words: " + words);
secondarySearchThreads[c++] = yacySearch.secondaryRemoteSearch(
words, "", urls, indexSegment, peers, crawlResults, this.rankedCache, peer, plasmaSwitchboard.urlBlacklist,
query.ranking, query.constraint, preselectedPeerHashes);
}
//} else {
//System.out.println("DEBUG-INDEXABSTRACT: no success using index abstracts from remote peers");
}
}
private String wordsFromPeer(final String peerhash, final String urls) {
Map.Entry<String, TreeMap<String, String>> entry;
String word, peerlist, url, wordlist = "";
TreeMap<String, String> urlPeerlist;
int p;
boolean hasURL;
synchronized (rcAbstracts) {
final Iterator<Map.Entry <String, TreeMap<String, String>>> i = rcAbstracts.entrySet().iterator();
while (i.hasNext()) {
entry = i.next();
word = entry.getKey();
urlPeerlist = entry.getValue();
hasURL = true;
for (int j = 0; j < urls.length(); j = j + 12) {
url = urls.substring(j, j + 12);
peerlist = urlPeerlist.get(url);
p = (peerlist == null) ? -1 : peerlist.indexOf(peerhash);
if ((p < 0) || (p % 12 != 0)) {
hasURL = false;
break;
}
}
if (hasURL) wordlist += word;
}
}
return wordlist;
}
public void remove(final String urlhash) {
// removes the url hash reference from last search result
/*indexRWIEntry e =*/ this.rankedCache.remove(urlhash);
//assert e != null;
}
public static class ResultEntry {
// payload objects
private final URLMetadataRow urlentry;
private final URLMetadataRow.Components urlcomps; // buffer for components
private String alternative_urlstring;
private String alternative_urlname;
private final plasmaSnippetCache.TextSnippet textSnippet;
private final ArrayList<plasmaSnippetCache.MediaSnippet> mediaSnippets;
// statistic objects
public long dbRetrievalTime, snippetComputationTime;
public ResultEntry(final URLMetadataRow urlentry,
final Segment indexSegment,
yacySeedDB peers,
final plasmaSnippetCache.TextSnippet textSnippet,
final ArrayList<plasmaSnippetCache.MediaSnippet> mediaSnippets,
final long dbRetrievalTime, final long snippetComputationTime) {
this.urlentry = urlentry;
this.urlcomps = urlentry.metadata();
this.alternative_urlstring = null;
this.alternative_urlname = null;
this.textSnippet = textSnippet;
this.mediaSnippets = mediaSnippets;
this.dbRetrievalTime = dbRetrievalTime;
this.snippetComputationTime = snippetComputationTime;
final String host = urlcomps.url().getHost();
if (host.endsWith(".yacyh")) {
// translate host into current IP
int p = host.indexOf(".");
final String hash = yacySeed.hexHash2b64Hash(host.substring(p + 1, host.length() - 6));
final yacySeed seed = peers.getConnected(hash);
final String filename = urlcomps.url().getFile();
String address = null;
if ((seed == null) || ((address = seed.getPublicAddress()) == null)) {
// seed is not known from here
try {
indexSegment.termIndex().remove(
Word.words2hashes(Condenser.getWords(
("yacyshare " +
filename.replace('?', ' ') +
" " +
urlcomps.dc_title())).keySet()),
urlentry.hash());
} catch (IOException e) {
e.printStackTrace();
}
indexSegment.urlMetadata().remove(urlentry.hash()); // clean up
throw new RuntimeException("index void");
}
alternative_urlstring = "http://" + address + "/" + host.substring(0, p) + filename;
alternative_urlname = "http://share." + seed.getName() + ".yacy" + filename;
if ((p = alternative_urlname.indexOf("?")) > 0) alternative_urlname = alternative_urlname.substring(0, p);
}
}
public int hashCode() {
return urlentry.hash().hashCode();
}
public String hash() {
return urlentry.hash();
}
public yacyURL url() {
return urlcomps.url();
}
public Bitfield flags() {
return urlentry.flags();
}
public String urlstring() {
return (alternative_urlstring == null) ? urlcomps.url().toNormalform(false, true) : alternative_urlstring;
}
public String urlname() {
return (alternative_urlname == null) ? yacyURL.unescape(urlcomps.url().toNormalform(false, true)) : alternative_urlname;
}
public String title() {
return urlcomps.dc_title();
}
public plasmaSnippetCache.TextSnippet textSnippet() {
return this.textSnippet;
}
public ArrayList<plasmaSnippetCache.MediaSnippet> mediaSnippets() {
return this.mediaSnippets;
}
public Date modified() {
return urlentry.moddate();
}
public int filesize() {
return urlentry.size();
}
public int limage() {
return urlentry.limage();
}
public int laudio() {
return urlentry.laudio();
}
public int lvideo() {
return urlentry.lvideo();
}
public int lapp() {
return urlentry.lapp();
}
public WordReferenceVars word() {
final Reference word = urlentry.word();
assert word instanceof WordReferenceVars;
return (WordReferenceVars) word;
}
public boolean hasTextSnippet() {
return (this.textSnippet != null) && (this.textSnippet.getErrorCode() < 11);
}
public boolean hasMediaSnippets() {
return (this.mediaSnippets != null) && (this.mediaSnippets.size() > 0);
}
public String resource() {
// generate transport resource
if ((textSnippet == null) || (!textSnippet.exists())) {
return urlentry.toString();
}
return urlentry.toString(textSnippet.getLineRaw());
}
}
}