git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@139 6c8d7289-2bf4-0310-a012-ef5d649a1542pull/1/head
orbiter
20 years ago
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// plasmaWordIndexAssortment.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: 18.5.2005
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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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/*
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An assortment is a set of words that appear exactly on a specific
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number of different web pages. A special case is, when the the word
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appear only on a single web page: this is called a 'singleton'.
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YaCy maintains a word cache for words appearing on x web pages.
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For each 'x' there is an assortment database, where 1<=x<=max
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If a word appears on more than 'max' web pages, the corresponing url-list
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is stored to some kind of back-end database which we consider as the
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'slowes' option to save data.
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*/
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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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public final class plasmaWordIndexAssortment {
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// environment constants
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private static final String assortmentFileName = "indexAssortment";
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public static final int[] bufferStructureBasis = 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 assortmentFile;
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private int assortmentCapacity;
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private serverLog log;
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private kelondroTree assortments;
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private long bufferSize;
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private int bufferStructureLength;
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private static String intx(int x) {
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String s = "" + x;
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while (s.length() < 3) s = "0" + s;
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return s;
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}
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private static int[] bufferStructure(int assortmentCapacity) {
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int[] structure = new int[3 + 2 * assortmentCapacity];
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structure[0] = bufferStructureBasis[0];
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structure[1] = bufferStructureBasis[1];
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structure[2] = bufferStructureBasis[2];
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for (int i = 0; i < assortmentCapacity; i++) {
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structure[3 + 2 * i] = bufferStructureBasis[3];
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structure[4 + 2 * i] = bufferStructureBasis[4];
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}
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return structure;
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}
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public plasmaWordIndexAssortment(File storagePath, int assortmentCapacity, int bufferkb, serverLog log) {
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if (!(storagePath.exists())) storagePath.mkdirs();
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this.assortmentFile = new File(storagePath, assortmentFileName + intx(assortmentCapacity) + ".db");
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this.assortmentCapacity = assortmentCapacity;
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this.bufferStructureLength = 3 + 2 * assortmentCapacity;
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this.bufferSize = bufferkb * 1024;
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this.log = log;
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if (assortmentFile.exists()) {
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// open existing singeton tree file
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try {
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assortments = new kelondroTree(assortmentFile, bufferSize);
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log.logSystem("Opened Assortment Database, " + assortments.size() + " entries.");
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} catch (IOException e){
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log.logError("unable to open assortment 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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assortments = new kelondroTree(assortmentFile, bufferSize, bufferStructure(assortmentCapacity));
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log.logSystem("Created new Assortment Database");
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} catch (IOException e){
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log.logError("unable to create assortment database: " + e.getMessage());
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e.printStackTrace();
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}
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}
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}
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public record newRecord(plasmaWordIndexEntry entry, long creationTime) {
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return new record(new plasmaWordIndexEntry[]{entry}, creationTime);
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}
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public record newRecord(plasmaWordIndexEntry[] entries, long creationTime) {
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return new record(entries, creationTime);
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}
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public class record {
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public plasmaWordIndexEntry[] entries;
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public long creationTime;
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public record(plasmaWordIndexEntry[] entries, long creationTime) {
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this.entries = entries;
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this.creationTime = creationTime;
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}
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}
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public void store(String wordHash, record newRecord) {
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// stores a word index to assortment database
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// this throws an exception if the word hash already existed
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//log.logDebug("storeAssortment: wordHash=" + wordHash + ", urlHash=" + entry.getUrlHash() + ", time=" + creationTime);
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byte[][] row = new byte[this.bufferStructureLength][];
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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(newRecord.creationTime, 8);
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for (int i = 0; i < assortmentCapacity; i++) {
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row[3 + 2 * i] = newRecord.entries[i].getUrlHash().getBytes();
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row[4 + 2 * i] = newRecord.entries[i].toEncodedForm(true).getBytes();
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}
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byte[][] oldrow = null;
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try {
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oldrow = assortments.put(row);
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} catch (IOException e) {
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log.logFailure("storeAssortment/IO-error: " + e.getMessage() + " - reset assortment-DB");
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e.printStackTrace();
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resetDatabase();
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} catch (kelondroException e) {
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log.logFailure("storeAssortment/kelondro-error: " + e.getMessage() + " - reset assortment-DB");
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e.printStackTrace();
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resetDatabase();
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}
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if (oldrow != null) throw new RuntimeException("Store to assortment ambiguous");
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}
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public record read(String wordHash) {
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// returns a single word index from assortment database; returns null if index does not exist
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//log.logDebug("readAssortment: wordHash=" + wordHash);
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byte[][] row = null;
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try {
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row = assortments.get(wordHash.getBytes());
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} catch (IOException e) {
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log.logFailure("readAssortment/IO-error: " + e.getMessage() + " - reset assortment-DB");
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e.printStackTrace();
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resetDatabase();
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} catch (kelondroException e) {
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log.logFailure("readAssortment/kelondro-error: " + e.getMessage() + " - reset assortment-DB");
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e.printStackTrace();
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resetDatabase();
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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[] wordEntries = new plasmaWordIndexEntry[this.bufferStructureLength];
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for (int i = 0; i < assortmentCapacity; i++) {
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wordEntries[i] = new plasmaWordIndexEntry(new String(row[3 + 2 * i]), new String(row[4 + 2 * i]));
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}
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return new record(wordEntries, creationTime);
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}
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public void remove(String wordHash) {
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// deletes a word index from assortment database
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//log.logDebug("removeAssortment: wordHash=" + wordHash);
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byte[][] row = null;
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try {
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row = assortments.remove(wordHash.getBytes());
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} catch (IOException e) {
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log.logFailure("removeAssortment/IO-error: " + e.getMessage() + " - reset assortment-DB");
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e.printStackTrace();
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resetDatabase();
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} catch (kelondroException e) {
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log.logFailure("removeAssortment/kelondro-error: " + e.getMessage() + " - reset assortment-DB");
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e.printStackTrace();
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resetDatabase();
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}
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}
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private void resetDatabase() {
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// deletes the assortment database and creates a new one
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try {
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assortments.close();
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} catch (IOException e) {}
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if (!(assortmentFile.delete())) throw new RuntimeException("cannot delete assortment database");
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try {
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assortments = new kelondroTree(assortmentFile, bufferSize, bufferStructure(assortmentCapacity));
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} catch (IOException e){
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log.logError("unable to re-create assortment database: " + e.getMessage());
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e.printStackTrace();
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}
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}
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public Iterator hashes(String startWordHash, boolean up, boolean rot) {
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try {
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return assortments.keys(up, rot, startWordHash.getBytes());
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} catch (IOException e) {
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log.logFailure("iterateAssortment/IO-error: " + e.getMessage() + " - reset assortment-DB");
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e.printStackTrace();
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resetDatabase();
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return null;
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}
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}
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public int size() {
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return assortments.size();
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}
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public void close() {
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try {
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assortments.close();
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} catch (IOException e){
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log.logError("unable to close assortment database: " + e.getMessage());
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e.printStackTrace();
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}
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}
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}
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