git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@205 6c8d7289-2bf4-0310-a012-ef5d649a1542pull/1/head
orbiter
20 years ago
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// plasmaWordIndexFileCacheMigration.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, 2004
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// last major change: 22.01.2004
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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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The plasmaIndexCache manages a database table with a list of
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indexEntries in it. This is done in a completely different fashion
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as organized by the plasmaIndex tables. The entries are not
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sorted and just stored in a buffer.
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Whenever during a seach an index is retrieved, first it's buffer
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is flushed into the corresponding index table, so that it can be
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sorted into the remaining index entry elements.
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The cache database consist of
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- the word hash as primary key
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- one column with a one-byte counter
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- a number of more columns with indexEntry elements
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*/
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// compile with
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// javac -classpath classes -sourcepath source -d classes -g source/de/anomic/plasma/*.java
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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 de.anomic.server.*;
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import de.anomic.kelondro.*;
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public class plasmaWordIndexClassicCacheMigration {
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private static final String indexCacheFileName = "indexCache.db";
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// class variables
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private File databaseRoot;
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private kelondroTree indexCache;
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private plasmaWordIndex fresh;
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public plasmaWordIndexClassicCacheMigration(File databaseRoot, plasmaWordIndex fresh) throws IOException {
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this.fresh = fresh;
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this.databaseRoot = databaseRoot;
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File indexCacheFile = new File(databaseRoot, indexCacheFileName);
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if (indexCacheFile.exists()) {
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// simply open the file
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indexCache = new kelondroTree(indexCacheFile, 0x400);
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if (indexCache.size() == 0) {
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indexCache.close();
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indexCacheFile.delete();
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indexCache = null;
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}
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} else {
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indexCache = null;
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}
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}
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protected void close() throws IOException {
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if (indexCache != null) indexCache.close();
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indexCache = null;
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}
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private byte[][] getCache(String wordHash) throws IOException {
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if (indexCache == null) return null;
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// read one line from the cache; if none exists: construct one
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byte[][] row;
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try {
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row = indexCache.get(wordHash.getBytes());
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} catch (Exception e) {
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// we had some negativeSeekOffsetExceptions here, and also loops may cause this
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// in that case the indexCache is corrupt
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System.out.println("Error in plasmaWordINdexFileCache.getCache: index for hash " + wordHash + " is corrupt:" + e.toString());
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//e.printStackTrace();
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row = null;
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}
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if (row == null) {
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row = new byte[indexCache.columns()][];
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row[0] = wordHash.getBytes();
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row[1] = new byte[1];
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row[1][0] = (byte) 0;
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}
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return row;
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}
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protected Iterator wordHashes() throws IOException {
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if (indexCache == null) return new HashSet().iterator();
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try {
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return indexCache.rows(true, false, null);
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} catch (kelondroException e) {
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de.anomic.server.serverLog.logError("PLASMA", "kelondro error in plasmaWordIndexFileCache: " + e.getMessage());
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return new HashSet().iterator();
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}
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}
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protected void remove(String wordHash) throws IOException {
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if (indexCache == null) return;
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indexCache.remove(wordHash.getBytes());
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}
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private int size(String wordHash) throws IOException {
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if (indexCache == null) return 0;
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// return number of entries in specific cache
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byte[][] row = indexCache.get(wordHash.getBytes());
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if (row == null) return 0;
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return (int) row[1][0];
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}
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public int size() {
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if (indexCache == null) return 0; else return indexCache.size();
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}
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public boolean oneStepMigration() {
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try {
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Iterator i = wordHashes();
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if (!(i.hasNext())) return false;
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byte[][] row = (byte[][]) i.next();
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if (row == null) return false;
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String hash = new String(row[0]);
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if (hash == null) return false;
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int size = (int) row[1][0];
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plasmaWordIndexEntryContainer container = new plasmaWordIndexEntryContainer(hash);
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plasmaWordIndexEntry[] entries = new plasmaWordIndexEntry[size];
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for (int j = 0; j < size; j++) {
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entries[j] = new plasmaWordIndexEntry(
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new String(row[j + 2], 0, plasmaCrawlLURL.urlHashLength),
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new String(row[j + 2], plasmaCrawlLURL.urlHashLength, plasmaWordIndexEntry.attrSpaceShort));
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}
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container.add(entries, System.currentTimeMillis());
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fresh.addEntries(container);
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i = null;
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remove(hash);
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return true;
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} catch (Exception e) {
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serverLog.logError("PLASMA MIGRATION", "oneStepMigration error: " + e.getMessage());
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e.printStackTrace();
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return false;
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}
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}
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}
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