mirror of
https://github.com/yacy/yacy_search_server.git
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376b917c91
git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@108 6c8d7289-2bf4-0310-a012-ef5d649a1542
570 lines
25 KiB
Java
570 lines
25 KiB
Java
// plasmaWordIndexCache.java
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// -------------------------
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// part of YACY
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2005
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// last major change: 6.5.2005
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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package de.anomic.plasma;
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import java.io.*;
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import java.util.*;
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import java.lang.RuntimeException;
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import de.anomic.kelondro.*;
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import de.anomic.server.serverLog;
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import de.anomic.yacy.yacySeedDB;
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public class plasmaWordIndexCache implements plasmaWordIndexInterface {
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// environment constants
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private static final String indexDumpFileName = "indexDump0.stack";
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private static final String singletonFileName = "indexSingletons0.db";
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private static final int[] bufferStructure = new int[]{
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plasmaWordIndexEntry.wordHashLength, // a wordHash
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4, // occurrence counter
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8, // timestamp of last access
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plasmaWordIndexEntry.urlHashLength, // corresponding URL hash
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plasmaWordIndexEntry.attrSpaceLong // URL attributes
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};
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// class variables
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private File databaseRoot;
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private plasmaWordIndexInterface backend;
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private TreeMap cache;
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private kelondroMScoreCluster hashScore;
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private HashMap hashDate;
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private int maxWords;
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private serverLog log;
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private kelondroTree singletons;
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private long singletonBufferSize;
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// calculated constants
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private static String minKey, maxKey;
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static {
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maxKey = "";
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for (int i = 0; i < yacySeedDB.commonHashLength; i++) maxKey += 'z';
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minKey = "";
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for (int i = 0; i < yacySeedDB.commonHashLength; i++) maxKey += '-';
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}
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public plasmaWordIndexCache(File databaseRoot, plasmaWordIndexInterface backend, int singletonbufferkb, serverLog log) {
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// creates a new index cache
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// the cache has a back-end where indexes that do not fit in the cache are flushed
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this.databaseRoot = databaseRoot;
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this.singletonBufferSize = singletonbufferkb * 1024;
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this.cache = new TreeMap();
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this.hashScore = new kelondroMScoreCluster();
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this.hashDate = new HashMap();
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this.maxWords = 10000;
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this.backend = backend;
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this.log = log;
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File singletonFile = new File(databaseRoot, singletonFileName);
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if (singletonFile.exists()) {
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// open existing singeton tree file
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try {
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singletons = new kelondroTree(singletonFile, singletonBufferSize);
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log.logSystem("Opened Singleton Database, " + singletons.size() + " entries.");
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} catch (IOException e){
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log.logError("unable to open singleton database: " + e.getMessage());
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e.printStackTrace();
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}
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} else {
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// create new sigleton tree file
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try {
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singletons = new kelondroTree(singletonFile, singletonBufferSize, bufferStructure);
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log.logSystem("Created new Singleton Database");
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} catch (IOException e){
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log.logError("unable to create singleton database: " + e.getMessage());
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e.printStackTrace();
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}
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}
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// read in dump of last session
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try {
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restore();
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} catch (IOException e){
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log.logError("unable to restore cache dump: " + e.getMessage());
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e.printStackTrace();
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}
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}
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private void dump(int waitingSeconds) throws IOException {
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log.logSystem("creating dump for index cache, " + cache.size() + " words (and much more urls)");
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File indexDumpFile = new File(databaseRoot, indexDumpFileName);
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if (indexDumpFile.exists()) indexDumpFile.delete();
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kelondroStack dumpStack = new kelondroStack(indexDumpFile, 0, bufferStructure);
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long startTime = System.currentTimeMillis();
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long messageTime = System.currentTimeMillis() + 5000;
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long wordsPerSecond = 0, wordcount = 0, urlcount = 0;
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synchronized (cache) {
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Iterator i = cache.entrySet().iterator();
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//Iterator i = hashScore.scores(true);
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Map.Entry entry;
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String wordHash;
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plasmaWordIndexEntryContainer container;
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long creationTime;
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plasmaWordIndexEntry wordEntry;
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byte[][] row = new byte[5][];
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while (i.hasNext()) {
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// get entries
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entry = (Map.Entry) i.next();
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//wordHash = (String) i.next();
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wordHash = (String) entry.getKey();
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creationTime = getCreationTime(wordHash);
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//container = (plasmaWordIndexEntryContainer) cache.get(wordHash);
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container = (plasmaWordIndexEntryContainer) entry.getValue();
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// put entries on stack
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if (container != null) {
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Iterator ci = container.entries();
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while (ci.hasNext()) {
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wordEntry = (plasmaWordIndexEntry) ci.next();
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row[0] = wordHash.getBytes();
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row[1] = kelondroRecords.long2bytes(container.size(), 4);
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row[2] = kelondroRecords.long2bytes(creationTime, 8);
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row[3] = wordEntry.getUrlHash().getBytes();
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row[4] = wordEntry.toEncodedForm(true).getBytes();
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dumpStack.push(row);
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urlcount++;
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}
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}
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wordcount++;
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// write a log
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if (System.currentTimeMillis() > messageTime) {
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wordsPerSecond = wordcount * 1000 / (1 + System.currentTimeMillis() - startTime);
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log.logInfo("dumping status: " + wordcount + " words done, " + ((cache.size() - wordcount) / wordsPerSecond) + " seconds remaining");
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messageTime = System.currentTimeMillis() + 5000;
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}
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}
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}
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dumpStack.close();
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log.logSystem("dumped " + urlcount + " word/url relations in " + ((System.currentTimeMillis() - startTime) / 1000) + " seconds");
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}
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private long restore() throws IOException {
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File indexDumpFile = new File(databaseRoot, indexDumpFileName);
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if (!(indexDumpFile.exists())) return 0;
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kelondroStack dumpStack = new kelondroStack(indexDumpFile, 0);
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log.logSystem("restore dump of index cache, " + dumpStack.size() + " word/url relations");
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long startTime = System.currentTimeMillis();
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long messageTime = System.currentTimeMillis() + 5000;
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long urlCount = 0, urlsPerSecond = 0;
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synchronized (cache) {
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Iterator i = dumpStack.iterator();
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kelondroRecords.Node node;
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String wordHash;
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plasmaWordIndexEntryContainer container;
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long creationTime;
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plasmaWordIndexEntry wordEntry;
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byte[][] row;
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while (i.hasNext()) {
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// get out one entry
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node = (kelondroRecords.Node) i.next();
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row = node.getValues();
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wordHash = new String(row[0]);
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creationTime = kelondroRecords.bytes2long(row[2]);
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wordEntry = new plasmaWordIndexEntry(new String(row[3]), new String(row[4]));
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// store to cache
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addEntry(wordHash, wordEntry, creationTime);
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urlCount++;
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// write a log
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if (System.currentTimeMillis() > messageTime) {
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urlsPerSecond = 1 + urlCount * 1000 / (1 + System.currentTimeMillis() - startTime);
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log.logInfo("restoring status: " + urlCount + " urls done, " + ((dumpStack.size() - urlCount) / urlsPerSecond) + " seconds remaining");
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messageTime = System.currentTimeMillis() + 5000;
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}
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}
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}
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dumpStack.close();
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log.logSystem("restored " + cache.size() + " words in " + ((System.currentTimeMillis() - startTime) / 1000) + " seconds");
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return urlCount;
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}
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// singleton access methods
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private void storeSingleton(String wordHash, plasmaWordIndexEntry entry, long creationTime) {
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// stores a word index to singleton database
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// this throws an exception if the word hash already existed
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//log.logDebug("storeSingleton: wordHash=" + wordHash + ", urlHash=" + entry.getUrlHash() + ", time=" + creationTime);
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byte[][] row = new byte[5][];
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row[0] = wordHash.getBytes();
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row[1] = kelondroRecords.long2bytes(1, 4);
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row[2] = kelondroRecords.long2bytes(creationTime, 8);
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row[3] = entry.getUrlHash().getBytes();
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row[4] = entry.toEncodedForm(true).getBytes();
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byte[][] oldrow = null;
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try {
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oldrow = singletons.put(row);
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} catch (IOException e) {
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log.logFailure("storeSingleton/IO-error: " + e.getMessage() + " - reset singleton-DB");
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e.printStackTrace();
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resetSingletonDatabase();
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} catch (kelondroException e) {
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log.logFailure("storeSingleton/kelondro-error: " + e.getMessage() + " - reset singleton-DB");
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e.printStackTrace();
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resetSingletonDatabase();
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}
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if (oldrow != null) throw new RuntimeException("Store to singleton ambiguous");
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}
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public Object[] /*{plasmaWordIndexEntry, Long(creationTime)}*/ readSingleton(String wordHash) {
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// returns a single word index from singleton database; returns null if index does not exist
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//log.logDebug("readSingleton: wordHash=" + wordHash);
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byte[][] row = null;
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try {
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row = singletons.get(wordHash.getBytes());
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} catch (IOException e) {
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log.logFailure("readSingleton/IO-error: " + e.getMessage() + " - reset singleton-DB");
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e.printStackTrace();
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resetSingletonDatabase();
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} catch (kelondroException e) {
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log.logFailure("readSingleton/kelondro-error: " + e.getMessage() + " - reset singleton-DB");
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e.printStackTrace();
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resetSingletonDatabase();
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}
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if (row == null) return null;
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long creationTime = kelondroRecords.bytes2long(row[2]);
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plasmaWordIndexEntry wordEntry = new plasmaWordIndexEntry(new String(row[3]), new String(row[4]));
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return new Object[]{wordEntry, new Long(creationTime)};
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}
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private void removeSingleton(String wordHash) {
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// deletes a word index from singleton database
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//log.logDebug("removeSingleton: wordHash=" + wordHash);
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byte[][] row = null;
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try {
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row = singletons.remove(wordHash.getBytes());
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} catch (IOException e) {
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log.logFailure("removeSingleton/IO-error: " + e.getMessage() + " - reset singleton-DB");
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e.printStackTrace();
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resetSingletonDatabase();
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} catch (kelondroException e) {
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log.logFailure("removeSingleton/kelondro-error: " + e.getMessage() + " - reset singleton-DB");
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e.printStackTrace();
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resetSingletonDatabase();
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}
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}
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private void resetSingletonDatabase() {
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// deletes the singleton database and creates a new one
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try {
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singletons.close();
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} catch (IOException e) {}
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File singletonFile = new File(databaseRoot, singletonFileName);
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if (!(singletonFile.delete())) throw new RuntimeException("cannot delete singleton database");
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try {
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singletons = new kelondroTree(singletonFile, singletonBufferSize, bufferStructure);
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} catch (IOException e){
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log.logError("unable to re-create singleton database: " + e.getMessage());
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e.printStackTrace();
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}
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}
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public Iterator singletonHashes(String startWordHash, boolean up, boolean rot) {
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try {
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return singletons.keys(up, rot, startWordHash.getBytes());
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} catch (IOException e) {
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log.logFailure("iterateSingleton/IO-error: " + e.getMessage() + " - reset singleton-DB");
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e.printStackTrace();
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resetSingletonDatabase();
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return null;
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}
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}
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// cache settings
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public int maxURLinWordCache() {
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return hashScore.getScore(hashScore.getMaxObject());
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}
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public int wordCacheRAMSize() {
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return cache.size();
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}
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public int singletonsSize() {
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return singletons.size();
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}
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public void setMaxWords(int maxWords) {
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this.maxWords = maxWords;
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}
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public int size() {
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return java.lang.Math.max(singletons.size(), java.lang.Math.max(backend.size(), cache.size()));
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}
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public Iterator wordHashes(String startWordHash, boolean up) {
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// here we merge 3 databases into one view:
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// - the RAM Cache
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// - the singleton File Cache
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// - the backend
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if (!(up)) throw new RuntimeException("plasmaWordIndexCache.wordHashes can only count up");
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return new kelondroMergeIterator(
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new kelondroMergeIterator(
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cache.keySet().iterator(),
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singletonHashes(startWordHash, true, false),
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true),
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backend.wordHashes(startWordHash, true),
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true);
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}
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private int flushFromMem(String key, boolean reintegrate) {
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// this method flushes indexes out from the ram to the disc.
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// at first we check the singleton database and act accordingly
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// if we we are to flush an index, but see also an entry in the singletons, we
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// decide upn the 'reintegrate'-Flag:
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// true: do not flush to disc, but re-Integrate the singleton to the RAM
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// false: flush the singleton together with container to disc
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plasmaWordIndexEntryContainer container = null;
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long time;
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synchronized (cache) {
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// get the container
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container = (plasmaWordIndexEntryContainer) cache.get(key);
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if (container == null) return 0; // flushing of nonexisting key
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time = getCreationTime(key);
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// remove it from the cache
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cache.remove(key);
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hashScore.deleteScore(key);
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hashDate.remove(key);
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}
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// now decide where to flush that container
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Object[] singleton = readSingleton(key);
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if (singleton == null) {
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// not found in singletons
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if (container.size() == 1) {
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// it is a singleton: store to singleton
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storeSingleton(key, container.getOne(), time);
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return 1;
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} else {
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// store to back-end; this should be a rare case
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return backend.addEntries(container, time);
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}
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} else {
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// we have a singleton and need to integrate this in the flush
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plasmaWordIndexEntry oldEntry = (plasmaWordIndexEntry) singleton[0];
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long oldTime = ((Long) singleton[1]).longValue();
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if (container.contains(oldEntry.getUrlHash())) {
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// we have an double-occurrence
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if (container.size() == 1) {
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// it is superfluous to flush this, simple do nothing
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return 0;
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} else {
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// we flush to the backend, and the entry from the singletons
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removeSingleton(key);
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return backend.addEntries(container, java.lang.Math.max(time, oldTime));
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}
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} else {
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// now we have more than one entry
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// we must remove the key from the singleton database
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removeSingleton(key);
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// .. and put it to the container
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container.add(oldEntry);
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if (reintegrate) {
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// put singleton together with container back to ram
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synchronized (cache) {
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cache.put(key, container);
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hashScore.setScore(key, container.size());
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hashDate.put(key, new Long(time));
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}
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return -1;
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} else {
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// add this to the backend
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return backend.addEntries(container, java.lang.Math.max(time, oldTime));
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}
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}
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}
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}
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private boolean flushFromSingleton(String key) {
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Object[] singleton = readSingleton(key);
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if (singleton == null) {
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return false;
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} else {
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// we have a singleton
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plasmaWordIndexEntry entry = (plasmaWordIndexEntry) singleton[0];
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long time = ((Long) singleton[1]).longValue();
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// remove it from the singleton database
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removeSingleton(key);
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// integrate it to the backend
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return backend.addEntries(plasmaWordIndexEntryContainer.instantContainer(key, entry), time) > 0;
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}
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}
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private int flushFromMemToLimit() {
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if ((hashScore.size() == 0) && (cache.size() == 0)) {
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serverLog.logDebug("PLASMA INDEXING", "flushToLimit: called but cache is empty");
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return 0;
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}
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if ((hashScore.size() == 0) && (cache.size() != 0)) {
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serverLog.logError("PLASMA INDEXING", "flushToLimit: hashScore.size=0 but cache.size=" + cache.size());
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return 0;
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}
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if ((hashScore.size() != 0) && (cache.size() == 0)) {
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serverLog.logError("PLASMA INDEXING", "flushToLimit: hashScore.size=" + hashScore.size() + " but cache.size=0");
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return 0;
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}
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//serverLog.logDebug("PLASMA INDEXING", "flushSpecific: hashScore.size=" + hashScore.size() + ", cache.size=" + cache.size());
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int total = 0;
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synchronized (hashScore) {
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String key;
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int count;
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Long createTime;
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// flush high-scores
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while ((total < 100) && (hashScore.size() >= maxWords)) {
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key = (String) hashScore.getMaxObject();
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createTime = (Long) hashDate.get(key);
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count = hashScore.getScore(key);
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if (count < 5) {
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log.logWarning("flushing of high-key " + key + " not appropriate (too less entries, count=" + count + "): increase cache size");
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break;
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}
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if ((createTime != null) && ((System.currentTimeMillis() - createTime.longValue()) < 9000)) {
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//log.logDebug("high-key " + key + " is too fresh, interrupting flush (count=" + count + ", cachesize=" + cache.size() + ", singleton-size=" + singletons.size() + ")");
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break;
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}
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//log.logDebug("flushing high-key " + key + ", count=" + count + ", cachesize=" + cache.size() + ", singleton-size=" + singletons.size());
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total += flushFromMem(key, false);
|
|
}
|
|
|
|
// flush singletons
|
|
Iterator i = hashScore.scores(true);
|
|
ArrayList al = new ArrayList();
|
|
while ((i.hasNext()) && (total < 200)) {
|
|
key = (String) i.next();
|
|
createTime = (Long) hashDate.get(key);
|
|
count = hashScore.getScore(key);
|
|
if (count > 1) {
|
|
//log.logDebug("flush of singleton-key " + key + ": count too high (count=" + count + ")");
|
|
break;
|
|
}
|
|
if ((createTime != null) && ((System.currentTimeMillis() - createTime.longValue()) < 90000)) {
|
|
//log.logDebug("singleton-key " + key + " is too fresh, interrupting flush (count=" + count + ", cachesize=" + cache.size() + ", singleton-size=" + singletons.size() + ")");
|
|
continue;
|
|
}
|
|
//log.logDebug("flushing singleton-key " + key + ", count=" + count + ", cachesize=" + cache.size() + ", singleton-size=" + singletons.size());
|
|
al.add(key);
|
|
total++;
|
|
}
|
|
for (int k = 0; k < al.size(); k++) flushFromMem((String) al.get(k), true);
|
|
}
|
|
return total;
|
|
}
|
|
|
|
public plasmaWordIndexEntity getIndex(String wordHash, boolean deleteIfEmpty) {
|
|
flushFromMem(wordHash, false);
|
|
flushFromSingleton(wordHash);
|
|
return backend.getIndex(wordHash, deleteIfEmpty);
|
|
}
|
|
|
|
public long getCreationTime(String wordHash) {
|
|
Long time = (Long) hashDate.get(wordHash);
|
|
if (time == null) return 0;
|
|
return time.longValue();
|
|
}
|
|
|
|
public void deleteIndex(String wordHash) {
|
|
synchronized (cache) {
|
|
cache.remove(wordHash);
|
|
hashScore.deleteScore(wordHash);
|
|
hashDate.remove(wordHash);
|
|
}
|
|
removeSingleton(wordHash);
|
|
backend.deleteIndex(wordHash);
|
|
}
|
|
|
|
public synchronized int removeEntries(String wordHash, String[] urlHashes, boolean deleteComplete) {
|
|
flushFromMem(wordHash, false);
|
|
flushFromSingleton(wordHash);
|
|
return backend.removeEntries(wordHash, urlHashes, deleteComplete);
|
|
}
|
|
|
|
public synchronized int addEntries(plasmaWordIndexEntryContainer container, long creationTime) {
|
|
//serverLog.logDebug("PLASMA INDEXING", "addEntryToIndexMem: cache.size=" + cache.size() + "; hashScore.size=" + hashScore.size());
|
|
flushFromMemToLimit();
|
|
//if (flushc > 0) serverLog.logDebug("PLASMA INDEXING", "addEntryToIndexMem - flushed " + flushc + " entries");
|
|
|
|
// put new words into cache
|
|
int added = 0;
|
|
synchronized (cache) {
|
|
String wordHash = container.wordHash();
|
|
plasmaWordIndexEntryContainer entries = (plasmaWordIndexEntryContainer) cache.get(wordHash); // null pointer exception? wordhash != null! must be cache==null
|
|
if (entries == null) entries = new plasmaWordIndexEntryContainer(wordHash);
|
|
added = entries.add(container);
|
|
if (added > 0) {
|
|
cache.put(wordHash, entries);
|
|
hashScore.addScore(wordHash, added);
|
|
hashDate.put(wordHash, new Long(creationTime));
|
|
}
|
|
}
|
|
//System.out.println("DEBUG: cache = " + cache.toString());
|
|
return added;
|
|
}
|
|
|
|
private void addEntry(String wordHash, plasmaWordIndexEntry newEntry, long creationTime) {
|
|
plasmaWordIndexEntryContainer entries = (plasmaWordIndexEntryContainer) cache.get(wordHash);
|
|
if (entries == null) entries = new plasmaWordIndexEntryContainer(wordHash);
|
|
if (entries.add(newEntry)) {
|
|
cache.put(wordHash, entries);
|
|
hashScore.incScore(wordHash);
|
|
hashDate.put(wordHash, new Long(creationTime));
|
|
}
|
|
}
|
|
|
|
public void close(int waitingSeconds) {
|
|
try {
|
|
singletons.close();
|
|
} catch (IOException e){
|
|
log.logError("unable to close singleton database: " + e.getMessage());
|
|
e.printStackTrace();
|
|
}
|
|
try {
|
|
dump(waitingSeconds);
|
|
} catch (IOException e){
|
|
log.logError("unable to dump cache: " + e.getMessage());
|
|
e.printStackTrace();
|
|
}
|
|
}
|
|
|
|
}
|