mirror of
https://github.com/yacy/yacy_search_server.git
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836 lines
32 KiB
Java
836 lines
32 KiB
Java
// plasmaWebStructure.java
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// -----------------------------
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// (C) 2007 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 15.05.2007 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 net.yacy.peers.graphics;
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import java.io.File;
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import java.io.Serializable;
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import java.text.ParseException;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.Set;
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import java.util.SortedMap;
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import java.util.TreeMap;
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import java.util.TreeSet;
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import java.util.concurrent.BlockingQueue;
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import java.util.concurrent.LinkedBlockingQueue;
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import net.yacy.cora.date.GenericFormatter;
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import net.yacy.cora.date.MicroDate;
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import net.yacy.cora.document.ASCII;
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import net.yacy.cora.document.UTF8;
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import net.yacy.cora.order.Base64Order;
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import net.yacy.cora.sorting.ClusteredScoreMap;
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import net.yacy.cora.sorting.ReversibleScoreMap;
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import net.yacy.cora.util.LookAheadIterator;
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import net.yacy.cora.util.SpaceExceededException;
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import net.yacy.document.Document;
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import net.yacy.kelondro.data.meta.DigestURI;
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import net.yacy.kelondro.index.Row;
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import net.yacy.kelondro.index.Row.Entry;
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import net.yacy.kelondro.logging.Log;
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import net.yacy.kelondro.rwi.AbstractReference;
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import net.yacy.kelondro.rwi.Reference;
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import net.yacy.kelondro.rwi.ReferenceContainer;
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import net.yacy.kelondro.rwi.ReferenceContainerCache;
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import net.yacy.kelondro.rwi.ReferenceFactory;
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import net.yacy.kelondro.util.FileUtils;
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import net.yacy.search.Switchboard;
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public class WebStructureGraph {
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public static int maxref = 200; // maximum number of references, to avoid overflow when a large link farm occurs (i.e. wikipedia)
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public static int maxhosts = 10000; // maximum number of hosts in web structure map
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private final static Log log = new Log("WebStructureGraph");
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private final File structureFile;
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private final TreeMap<String, byte[]> structure_old; // <b64hash(6)>','<host> to <date-yyyymmdd(8)>{<target-b64hash(6)><target-count-hex(4)>}*
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private final TreeMap<String, byte[]> structure_new;
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private final BlockingQueue<LearnObject> publicRefDNSResolvingQueue;
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private final PublicRefDNSResolvingProcess publicRefDNSResolvingWorker;
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private final static LearnObject leanrefObjectPOISON = new LearnObject(null, null);
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private static class LearnObject {
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private final DigestURI url;
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private final Set<DigestURI> globalRefURLs;
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private LearnObject(final DigestURI url, final Set<DigestURI> globalRefURLs) {
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this.url = url;
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this.globalRefURLs = globalRefURLs;
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}
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}
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public WebStructureGraph(final File structureFile) {
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this.structure_old = new TreeMap<String, byte[]>();
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this.structure_new = new TreeMap<String, byte[]>();
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this.structureFile = structureFile;
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this.publicRefDNSResolvingQueue = new LinkedBlockingQueue<LearnObject>();
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// load web structure
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Map<String, byte[]> loadedStructureB;
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try {
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loadedStructureB =
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(this.structureFile.exists())
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? FileUtils.loadMapB(this.structureFile)
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: new TreeMap<String, byte[]>();
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} catch ( final OutOfMemoryError e ) {
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loadedStructureB = new TreeMap<String, byte[]>();
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}
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if ( loadedStructureB != null ) {
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this.structure_old.putAll(loadedStructureB);
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}
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log.logInfo("loaded dump of " + loadedStructureB.size() + " entries from " + this.structureFile.toString());
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// delete out-dated entries in case the structure is too big
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if ( this.structure_old.size() > maxhosts ) {
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// fill a set with last-modified - dates of the structure
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final TreeSet<String> delset = new TreeSet<String>();
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String key;
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byte[] value;
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for ( final Map.Entry<String, byte[]> entry : this.structure_old.entrySet() ) {
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key = entry.getKey();
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value = entry.getValue();
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if ( value != null && value.length >= 8 ) {
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delset.add(UTF8.String(value).substring(0, 8) + key);
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}
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}
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int delcount = this.structure_old.size() - (maxhosts * 9 / 10);
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final Iterator<String> j = delset.iterator();
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while ( (delcount > 0) && (j.hasNext()) ) {
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this.structure_old.remove(j.next().substring(8));
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delcount--;
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}
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}
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this.publicRefDNSResolvingWorker = new PublicRefDNSResolvingProcess();
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this.publicRefDNSResolvingWorker.start();
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}
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private class PublicRefDNSResolvingProcess extends Thread {
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private PublicRefDNSResolvingProcess() {
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}
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@Override
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public void run() {
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LearnObject lro;
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try {
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while ( (lro = WebStructureGraph.this.publicRefDNSResolvingQueue.take()) != leanrefObjectPOISON ) {
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learnrefs(lro);
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}
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} catch ( final InterruptedException e ) {
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}
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}
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}
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public void clear() {
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this.structure_old.clear();
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this.structure_new.clear();
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}
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public void generateCitationReference(final DigestURI url, final Document document) {
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// generate citation reference
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final Map<DigestURI, String> hl = document.getHyperlinks();
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final Iterator<DigestURI> it = hl.keySet().iterator();
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final HashSet<DigestURI> globalRefURLs = new HashSet<DigestURI>();
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final String refhost = url.getHost();
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DigestURI u;
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int maxref = 1000;
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while ( it.hasNext() && maxref-- > 0 ) {
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u = it.next();
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if ( u == null ) {
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continue;
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}
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if ( refhost != null && u.getHost() != null && !u.getHost().equals(refhost) ) {
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// this is a global link
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globalRefURLs.add(u);
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}
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}
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final LearnObject lro = new LearnObject(url, globalRefURLs);
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if (!globalRefURLs.isEmpty()) {
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try {
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if (this.publicRefDNSResolvingWorker.isAlive()) {
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this.publicRefDNSResolvingQueue.put(lro);
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} else {
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learnrefs(lro);
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}
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} catch ( final InterruptedException e ) {
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learnrefs(lro);
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}
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}
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}
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public void generateCitationReference(final DigestURI from, final DigestURI to) {
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final HashSet<DigestURI> globalRefURLs = new HashSet<DigestURI>();
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final String refhost = from.getHost();
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if (refhost != null && to.getHost() != null && !to.getHost().equals(refhost)) globalRefURLs.add(to);
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final LearnObject lro = new LearnObject(from, globalRefURLs);
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if ( !globalRefURLs.isEmpty() ) {
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try {
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if (this.publicRefDNSResolvingWorker.isAlive()) {
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this.publicRefDNSResolvingQueue.put(lro);
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} else {
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learnrefs(lro);
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}
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} catch ( final InterruptedException e ) {
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learnrefs(lro);
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}
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}
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}
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private static int refstr2count(final String refs) {
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if (refs == null || refs.length() <= 8) return 0;
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assert (refs.length() - 8) % 10 == 0 : "refs = " + refs + ", length = " + refs.length();
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return (refs.length() - 8) / 10;
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}
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private static Map<String, Integer> refstr2map(final String refs) {
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if (refs == null || refs.length() <= 8) return new HashMap<String, Integer>();
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final Map<String, Integer> map = new HashMap<String, Integer>();
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String c;
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final int refsc = refstr2count(refs);
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int d;
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for (int i = 0; i < refsc; i++) {
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c = refs.substring(8 + i * 10, 8 + (i + 1) * 10);
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try {
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d = Integer.valueOf(c.substring(6), 16);
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} catch ( final NumberFormatException e ) {
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d = 1;
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}
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map.put(c.substring(0, 6), d);
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}
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return map;
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}
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private static String none2refstr() {
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return GenericFormatter.SHORT_DAY_FORMATTER.format();
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}
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private static String map2refstr(final Map<String, Integer> map) {
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final StringBuilder s = new StringBuilder(GenericFormatter.PATTERN_SHORT_DAY.length() + map.size() * 10);
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s.append(GenericFormatter.SHORT_DAY_FORMATTER.format());
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String h;
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for ( final Map.Entry<String, Integer> entry : map.entrySet() ) {
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s.append(entry.getKey());
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h = Integer.toHexString(entry.getValue().intValue());
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final int hl = h.length();
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if ( hl == 0 ) {
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s.append("0000");
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} else if ( hl == 1 ) {
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s.append("000").append(h);
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} else if ( hl == 2 ) {
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s.append("00").append(h);
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} else if ( hl == 3 ) {
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s.append('0').append(h);
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} else if ( hl == 4 ) {
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s.append(h);
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} else {
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s.append("FFFF");
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}
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}
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return s.toString();
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}
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public boolean exists(final String hosthash) {
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// returns a map with a hosthash(String):refcount(Integer) relation
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assert hosthash.length() == 6;
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SortedMap<String, byte[]> tailMap;
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synchronized ( this.structure_old ) {
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tailMap = this.structure_old.tailMap(hosthash);
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if ( !tailMap.isEmpty() ) {
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final String key = tailMap.firstKey();
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if ( key.startsWith(hosthash) ) {
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return true;
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}
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}
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}
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synchronized ( this.structure_new ) {
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tailMap = this.structure_new.tailMap(hosthash);
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if ( !tailMap.isEmpty() ) {
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final String key = tailMap.firstKey();
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if ( key.startsWith(hosthash) ) {
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return true;
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}
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}
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}
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return false;
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}
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public StructureEntry outgoingReferences(final String hosthash) {
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// returns a map with a hosthash(String):refcount(Integer) relation
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assert hosthash.length() == 6;
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SortedMap<String, byte[]> tailMap;
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Map<String, Integer> h = new HashMap<String, Integer>();
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String hostname = "";
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String date = "";
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String ref;
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synchronized ( this.structure_old ) {
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tailMap = this.structure_old.tailMap(hosthash);
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if ( !tailMap.isEmpty() ) {
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final String key = tailMap.firstKey();
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if ( key.startsWith(hosthash) ) {
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hostname = key.substring(7);
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ref = ASCII.String(tailMap.get(key));
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date = ref.substring(0, 8);
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h = refstr2map(ref);
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}
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}
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}
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synchronized ( this.structure_new ) {
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tailMap = this.structure_new.tailMap(hosthash);
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if ( !tailMap.isEmpty() ) {
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final String key = tailMap.firstKey();
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if ( key.startsWith(hosthash) ) {
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ref = ASCII.String(tailMap.get(key));
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if ( hostname.isEmpty() ) {
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hostname = key.substring(7);
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}
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if ( date.isEmpty() ) {
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date = ref.substring(0, 8);
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}
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h.putAll(refstr2map(ref));
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}
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}
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}
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if (h.isEmpty()) return null;
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return new StructureEntry(hosthash, hostname, date, h);
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}
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public StructureEntry incomingReferences(final String hosthash) {
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final String hostname = hostHash2hostName(hosthash);
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if ( hostname == null ) {
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return null;
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}
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// collect the references
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WebStructureGraph.StructureEntry sentry;
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final HashMap<String, Integer> hosthashes = new HashMap<String, Integer>();
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Iterator<WebStructureGraph.StructureEntry> i = new StructureIterator(false);
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while ( i.hasNext() ) {
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sentry = i.next();
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if ( sentry.references.containsKey(hosthash) ) {
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hosthashes.put(sentry.hosthash, sentry.references.get(hosthash));
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}
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}
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i = new StructureIterator(true);
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while ( i.hasNext() ) {
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sentry = i.next();
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if ( sentry.references.containsKey(hosthash) ) {
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hosthashes.put(sentry.hosthash, sentry.references.get(hosthash));
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}
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}
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// construct a new structureEntry Object
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return new StructureEntry(
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hosthash,
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hostname,
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GenericFormatter.SHORT_DAY_FORMATTER.format(),
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hosthashes);
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}
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public static class HostReferenceFactory implements ReferenceFactory<HostReference>, Serializable {
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private static final long serialVersionUID=7461135579006223155L;
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private static final Row hostReferenceRow = new Row(
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"String h-6, Cardinal m-4 {b256}, Cardinal c-4 {b256}",
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Base64Order.enhancedCoder);
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public HostReferenceFactory() {
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}
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@Override
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public Row getRow() {
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return hostReferenceRow;
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}
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@Override
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public HostReference produceSlow(final Entry e) {
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return new HostReference(e);
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}
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@Override
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public HostReference produceFast(final HostReference e, final boolean local) {
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return e;
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}
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}
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public static class HostReference extends AbstractReference implements Reference, Serializable {
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private static final long serialVersionUID=-9170091435821206765L;
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private final Row.Entry entry;
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private HostReference(final byte[] hostHash, final long modified, final int count) {
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assert (hostHash.length == 6) : "hostHash = " + ASCII.String(hostHash);
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this.entry = hostReferenceFactory.getRow().newEntry();
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this.entry.setCol(0, hostHash);
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this.entry.setCol(1, MicroDate.microDateDays(modified));
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this.entry.setCol(2, count);
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}
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public HostReference(final String json) {
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this.entry = hostReferenceFactory.getRow().newEntry(json, true);
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}
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private HostReference(final Row.Entry entry) {
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this.entry = entry;
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}
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@Override
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public String toPropertyForm() {
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return this.entry.toPropertyForm(':', true, true, false, true);
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}
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@Override
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public Entry toKelondroEntry() {
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return this.entry;
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}
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@Override
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public byte[] urlhash() {
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return this.entry.getPrimaryKeyBytes();
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}
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private int count() {
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return (int) this.entry.getColLong(2);
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}
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@Override
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public long lastModified() {
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return MicroDate.reverseMicroDateDays((int) this.entry.getColLong(1));
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}
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@Override
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public void join(final Reference r) {
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// joins two entries into one entry
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final HostReference oe = (HostReference) r;
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// combine date
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final long o = oe.lastModified();
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if ( lastModified() < o ) {
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this.entry.setCol(1, MicroDate.microDateDays(o));
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}
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// combine count
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final int c = oe.count();
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if ( count() < c ) {
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this.entry.setCol(2, c);
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}
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}
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@Override
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public Collection<Integer> positions() {
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return new ArrayList<Integer>(0);
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}
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}
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public static final HostReferenceFactory hostReferenceFactory = new HostReferenceFactory();
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private static ReferenceContainerCache<HostReference> hostReferenceIndexCache = null;
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private static long hostReferenceIndexCacheTime = 0;
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private static final long hostReferenceIndexCacheTTL = 1000 * 60 * 60 * 12; // 12 hours time to live for cache
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public synchronized ReferenceContainerCache<HostReference> incomingReferences() {
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// we return a cache if the cache is filled and not stale
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if ( hostReferenceIndexCache != null
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&& hostReferenceIndexCacheTime + hostReferenceIndexCacheTTL > System.currentTimeMillis() ) {
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return hostReferenceIndexCache;
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}
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// collect the references
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final ReferenceContainerCache<HostReference> idx =
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new ReferenceContainerCache<HostReference>(hostReferenceFactory, Base64Order.enhancedCoder, 6);
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// we iterate over all structure entries.
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// one structure entry has information that a specific host links to a list of other hosts
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incomingReferencesEnrich(idx, new StructureIterator(false), 3000);
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incomingReferencesEnrich(idx, new StructureIterator(true), 3000);
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// fill the cache again and set fill time
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hostReferenceIndexCache = idx;
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hostReferenceIndexCacheTime = System.currentTimeMillis();
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//incomingReferencesTest(hostReferenceIndexCache);
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return hostReferenceIndexCache;
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}
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private void incomingReferencesEnrich(
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final ReferenceContainerCache<HostReference> idx,
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final Iterator<WebStructureGraph.StructureEntry> structureIterator,
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final long time) {
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// we iterate over all structure entries.
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// one structure entry has information that a specific host links to a list of other hosts
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final long timeout = System.currentTimeMillis() + time;
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byte[] term;
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HostReference hr;
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WebStructureGraph.StructureEntry sentry;
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structureLoop: while ( structureIterator.hasNext() ) {
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sentry = structureIterator.next();
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// then we loop over all the hosts that are linked from sentry.hosthash
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refloop: for ( final Map.Entry<String, Integer> refhosthashandcounter : sentry.references
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.entrySet() ) {
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term = UTF8.getBytes(refhosthashandcounter.getKey());
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try {
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hr =
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new HostReference(
|
|
ASCII.getBytes(sentry.hosthash),
|
|
GenericFormatter.SHORT_DAY_FORMATTER.parse(sentry.date).getTime(),
|
|
refhosthashandcounter.getValue().intValue());
|
|
} catch ( final ParseException e ) {
|
|
continue refloop;
|
|
}
|
|
// each term refers to an index entry. look if we already have such an entry
|
|
ReferenceContainer<HostReference> r = idx.get(term, null);
|
|
try {
|
|
if ( r == null ) {
|
|
r = new ReferenceContainer<HostReference>(hostReferenceFactory, term);
|
|
r.add(hr);
|
|
idx.add(r);
|
|
} else {
|
|
r.put(hr);
|
|
}
|
|
} catch ( final SpaceExceededException e ) {
|
|
continue refloop;
|
|
}
|
|
}
|
|
if ( System.currentTimeMillis() > timeout ) {
|
|
break structureLoop;
|
|
}
|
|
}
|
|
}
|
|
|
|
public int referencesCount(final String hosthash) {
|
|
// returns the number of hosts that are referenced by this hosthash
|
|
assert hosthash.length() == 6 : "hosthash = " + hosthash;
|
|
if (hosthash == null || hosthash.length() != 6) return 0;
|
|
SortedMap<String, byte[]> tailMap;
|
|
int c = 0;
|
|
try {
|
|
synchronized ( this.structure_old ) {
|
|
tailMap = this.structure_old.tailMap(hosthash);
|
|
if ( !tailMap.isEmpty() ) {
|
|
final String key = tailMap.firstKey();
|
|
if ( key.startsWith(hosthash) ) {
|
|
c = refstr2count(UTF8.String(tailMap.get(key)));
|
|
}
|
|
}
|
|
}
|
|
synchronized ( this.structure_new ) {
|
|
tailMap = this.structure_new.tailMap(hosthash);
|
|
if ( !tailMap.isEmpty() ) {
|
|
final String key = tailMap.firstKey();
|
|
if ( key.startsWith(hosthash) ) {
|
|
c += refstr2count(UTF8.String(tailMap.get(key)));
|
|
}
|
|
}
|
|
}
|
|
} catch (Throwable t) {
|
|
this.clear();
|
|
}
|
|
return c;
|
|
}
|
|
|
|
public String hostHash2hostName(final String hosthash) {
|
|
// returns the host as string, null if unknown
|
|
assert hosthash.length() == 6;
|
|
SortedMap<String, byte[]> tailMap;
|
|
synchronized ( this.structure_old ) {
|
|
tailMap = this.structure_old.tailMap(hosthash);
|
|
if ( !tailMap.isEmpty() ) {
|
|
final String key = tailMap.firstKey();
|
|
if ( key.startsWith(hosthash) ) {
|
|
return key.substring(7);
|
|
}
|
|
}
|
|
}
|
|
synchronized ( this.structure_new ) {
|
|
tailMap = this.structure_new.tailMap(hosthash);
|
|
if ( !tailMap.isEmpty() ) {
|
|
final String key = tailMap.firstKey();
|
|
if ( key.startsWith(hosthash) ) {
|
|
return key.substring(7);
|
|
}
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
|
|
private void learnrefs(final LearnObject lro) {
|
|
final Set<String> refhosts = new HashSet<String>();
|
|
String hosthash;
|
|
for ( final DigestURI u : lro.globalRefURLs ) {
|
|
if (Switchboard.getSwitchboard().shallTerminate()) break;
|
|
hosthash = ASCII.String(u.hash(), 6, 6);
|
|
if (!exists(hosthash)) {
|
|
// this must be recorded as an host with no references
|
|
synchronized ( this.structure_new ) {
|
|
this.structure_new.put(hosthash + "," + u.getHost(), UTF8.getBytes(none2refstr()));
|
|
}
|
|
}
|
|
refhosts.add(hosthash);
|
|
}
|
|
final DigestURI url = lro.url;
|
|
hosthash = ASCII.String(url.hash(), 6, 6);
|
|
|
|
// parse the new reference string and join it with the stored references
|
|
final StructureEntry structure = outgoingReferences(hosthash);
|
|
final Map<String, Integer> refs = (structure == null) ? new HashMap<String, Integer>() : structure.references;
|
|
int c;
|
|
for (String dom: refhosts) {
|
|
c = 0;
|
|
if ( refs.containsKey(dom) ) {
|
|
c = (refs.get(dom)).intValue();
|
|
}
|
|
refs.put(dom, Integer.valueOf(++c));
|
|
}
|
|
|
|
// check if the maxref is exceeded
|
|
if ( refs.size() > maxref ) {
|
|
int shrink = refs.size() - (maxref * 9 / 10);
|
|
delloop: while ( shrink > 0 ) {
|
|
// shrink the references: the entry with the smallest number of references is removed
|
|
int minrefcount = Integer.MAX_VALUE;
|
|
String minrefkey = null;
|
|
findloop: for ( final Map.Entry<String, Integer> entry : refs.entrySet() ) {
|
|
if ( entry.getValue().intValue() < minrefcount ) {
|
|
minrefcount = entry.getValue().intValue();
|
|
minrefkey = entry.getKey();
|
|
}
|
|
if ( minrefcount == 1 ) {
|
|
break findloop;
|
|
}
|
|
}
|
|
// remove the smallest
|
|
if ( minrefkey == null ) {
|
|
break delloop;
|
|
}
|
|
refs.remove(minrefkey);
|
|
shrink--;
|
|
}
|
|
}
|
|
|
|
// store the map back to the structure
|
|
synchronized ( this.structure_new ) {
|
|
this.structure_new.put(hosthash + "," + url.getHost(), UTF8.getBytes(map2refstr(refs)));
|
|
}
|
|
}
|
|
|
|
private static void joinStructure(final TreeMap<String, byte[]> into, final TreeMap<String, byte[]> from) {
|
|
for ( final Map.Entry<String, byte[]> e : from.entrySet() ) {
|
|
if ( into.containsKey(e.getKey()) ) {
|
|
final Map<String, Integer> s0 = refstr2map(UTF8.String(into.get(e.getKey())));
|
|
final Map<String, Integer> s1 = refstr2map(UTF8.String(e.getValue()));
|
|
for ( final Map.Entry<String, Integer> r : s1.entrySet() ) {
|
|
if ( s0.containsKey(r.getKey()) ) {
|
|
s0.put(r.getKey(), s0.get(r.getKey()).intValue() + r.getValue().intValue());
|
|
} else {
|
|
s0.put(r.getKey(), r.getValue().intValue());
|
|
}
|
|
}
|
|
into.put(e.getKey(), UTF8.getBytes(map2refstr(s0)));
|
|
} else {
|
|
into.put(e.getKey(), e.getValue());
|
|
}
|
|
}
|
|
}
|
|
|
|
public void joinOldNew() {
|
|
synchronized ( this.structure_new ) {
|
|
joinStructure(this.structure_old, this.structure_new);
|
|
this.structure_new.clear();
|
|
}
|
|
}
|
|
|
|
public String hostWithMaxReferences() {
|
|
// find host with most references
|
|
String maxhost = null;
|
|
int refsize, maxref = 0;
|
|
synchronized ( this.structure_old ) {
|
|
for ( final Map.Entry<String, byte[]> entry : this.structure_old.entrySet() ) {
|
|
refsize = entry.getValue().length;
|
|
if ( refsize > maxref ) {
|
|
maxref = refsize;
|
|
maxhost = entry.getKey().substring(7);
|
|
}
|
|
}
|
|
}
|
|
synchronized ( this.structure_new ) {
|
|
for ( final Map.Entry<String, byte[]> entry : this.structure_new.entrySet() ) {
|
|
refsize = entry.getValue().length;
|
|
if ( refsize > maxref ) {
|
|
maxref = refsize;
|
|
maxhost = entry.getKey().substring(7);
|
|
}
|
|
}
|
|
}
|
|
return maxhost;
|
|
}
|
|
|
|
public ReversibleScoreMap<String> hostReferenceScore() {
|
|
ReversibleScoreMap<String> result = new ClusteredScoreMap<String>(ASCII.identityASCIIComparator);
|
|
synchronized ( this.structure_old ) {
|
|
for ( final Map.Entry<String, byte[]> entry : this.structure_old.entrySet() ) {
|
|
result.set(entry.getKey().substring(7), (entry.getValue().length - 8) / 10);
|
|
}
|
|
}
|
|
synchronized ( this.structure_new ) {
|
|
for ( final Map.Entry<String, byte[]> entry : this.structure_new.entrySet() ) {
|
|
result.set(entry.getKey().substring(7), (entry.getValue().length - 8) / 10);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
public Iterator<StructureEntry> structureEntryIterator(final boolean latest) {
|
|
return new StructureIterator(latest);
|
|
}
|
|
|
|
private class StructureIterator extends LookAheadIterator<StructureEntry> implements Iterator<StructureEntry> {
|
|
|
|
private final Iterator<Map.Entry<String, byte[]>> i;
|
|
|
|
private StructureIterator(final boolean latest) {
|
|
this.i = ((latest) ? WebStructureGraph.this.structure_new : WebStructureGraph.this.structure_old).entrySet().iterator();
|
|
}
|
|
|
|
@Override
|
|
public StructureEntry next0() {
|
|
Map.Entry<String, byte[]> entry = null;
|
|
String dom = null;
|
|
byte[] ref = null;
|
|
String refs;
|
|
while ( this.i.hasNext() ) {
|
|
entry = this.i.next();
|
|
ref = entry.getValue();
|
|
if ( (ref.length - 8) % 10 != 0 ) {
|
|
continue;
|
|
}
|
|
dom = entry.getKey();
|
|
if ( dom.length() >= 8 ) {
|
|
break;
|
|
}
|
|
dom = null;
|
|
}
|
|
if ( entry == null || dom == null ) {
|
|
return null;
|
|
}
|
|
assert (ref.length - 8) % 10 == 0 : "refs = " + ref + ", length = " + ref.length;
|
|
refs = UTF8.String(ref);
|
|
return new StructureEntry(
|
|
dom.substring(0, 6),
|
|
dom.substring(7),
|
|
refs.substring(0, 8),
|
|
refstr2map(refs));
|
|
}
|
|
}
|
|
|
|
public static class StructureEntry implements Comparable<StructureEntry> {
|
|
|
|
public String hosthash; // the tail of the host hash
|
|
public String hostname; // the host name
|
|
public String date; // date of latest change
|
|
public Map<String, Integer> references; // a map from the referenced host hash to the number of referenced to that host
|
|
|
|
private StructureEntry(final String hosthash, final String hostname) {
|
|
this(hosthash, hostname, GenericFormatter.SHORT_DAY_FORMATTER.format(), new HashMap<String, Integer>());
|
|
}
|
|
|
|
private StructureEntry(
|
|
final String hosthash,
|
|
final String hostname,
|
|
final String date,
|
|
final Map<String, Integer> references) {
|
|
this.hosthash = hosthash;
|
|
this.hostname = hostname;
|
|
this.date = date;
|
|
this.references = references;
|
|
}
|
|
|
|
@Override
|
|
public int compareTo(StructureEntry arg0) {
|
|
return hosthash.compareTo(arg0.hosthash);
|
|
}
|
|
|
|
@Override
|
|
public boolean equals(Object o) {
|
|
if (!(o instanceof StructureEntry)) return false;
|
|
return hosthash.equals(((StructureEntry)o).hosthash);
|
|
}
|
|
|
|
@Override
|
|
public int hashCode() {
|
|
return this.hosthash.hashCode();
|
|
}
|
|
}
|
|
|
|
public synchronized void close() {
|
|
// finish dns resolving queue
|
|
if ( this.publicRefDNSResolvingWorker.isAlive() ) {
|
|
log.logInfo("Waiting for the DNS Resolving Queue to terminate");
|
|
try {
|
|
this.publicRefDNSResolvingQueue.put(leanrefObjectPOISON);
|
|
this.publicRefDNSResolvingWorker.join(5000);
|
|
} catch ( final InterruptedException e ) {
|
|
}
|
|
}
|
|
|
|
// save to web structure file
|
|
log.logInfo("Saving Web Structure File: new = "
|
|
+ this.structure_new.size()
|
|
+ " entries, old = "
|
|
+ this.structure_old.size()
|
|
+ " entries");
|
|
final long time = System.currentTimeMillis();
|
|
joinOldNew();
|
|
log.logInfo("dumping " + structure_old.size() + " entries to " + structureFile.toString());
|
|
if ( !this.structure_old.isEmpty() ) {
|
|
synchronized ( this.structure_old ) {
|
|
if ( !this.structure_old.isEmpty() ) {
|
|
FileUtils
|
|
.saveMapB(
|
|
this.structureFile,
|
|
this.structure_old,
|
|
"Web Structure Syntax: <b64hash(6)>','<host> to <date-yyyymmdd(8)>{<target-b64hash(6)><target-count-hex(4)>}*");
|
|
final long t = Math.max(1, System.currentTimeMillis() - time);
|
|
log.logInfo("Saved Web Structure File: "
|
|
+ this.structure_old.size()
|
|
+ " entries in "
|
|
+ t
|
|
+ " milliseconds, "
|
|
+ (this.structure_old.size() * 1000 / t)
|
|
+ " entries/second");
|
|
}
|
|
this.structure_old.clear();
|
|
}
|
|
}
|
|
}
|
|
}
|