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527 lines
22 KiB
527 lines
22 KiB
// kelondroRowCollection.java
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// (C) 2006 by Michael Peter Christen; mc@anomic.de, Frankfurt a. M., Germany
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// first published 12.01.2006 on http://www.anomic.de
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//
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// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
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// $LastChangedRevision: 1986 $
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// $LastChangedBy: orbiter $
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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 de.anomic.kelondro;
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import java.io.File;
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import java.io.IOException;
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import java.util.Date;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Set;
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import de.anomic.server.serverFileUtils;
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import de.anomic.server.logging.serverLog;
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public class kelondroRowCollection {
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public static final double growfactor = 1.4;
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protected byte[] chunkcache;
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protected int chunkcount;
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protected long lastTimeRead, lastTimeWrote;
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protected kelondroRow rowdef;
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protected int sortBound;
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private static final int exp_chunkcount = 0;
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private static final int exp_last_read = 1;
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private static final int exp_last_wrote = 2;
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private static final int exp_order_type = 3;
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private static final int exp_order_col = 4;
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private static final int exp_order_bound = 5;
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private static final int exp_collection = 6;
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public kelondroRowCollection(kelondroRowCollection rc) {
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this.rowdef = rc.rowdef;
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this.chunkcache = rc.chunkcache;
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this.chunkcount = rc.chunkcount;
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this.sortBound = rc.sortBound;
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this.lastTimeRead = rc.lastTimeRead;
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this.lastTimeWrote = rc.lastTimeWrote;
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}
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public kelondroRowCollection(kelondroRow rowdef, int objectCount) {
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this.rowdef = rowdef;
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this.chunkcache = new byte[objectCount * rowdef.objectsize()];
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this.chunkcount = 0;
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this.sortBound = 0;
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this.lastTimeRead = System.currentTimeMillis();
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this.lastTimeWrote = System.currentTimeMillis();
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}
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public kelondroRowCollection(kelondroRow rowdef, int objectCount, byte[] cache, int sortBound) {
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this.rowdef = rowdef;
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this.chunkcache = cache;
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this.chunkcount = objectCount;
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this.sortBound = sortBound;
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this.lastTimeRead = System.currentTimeMillis();
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this.lastTimeWrote = System.currentTimeMillis();
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}
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public kelondroRowCollection(kelondroRow rowdef, byte[] exportedCollectionRowinstance) {
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this.rowdef = rowdef;
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int chunkcachelength = exportedCollectionRowinstance.length - exportOverheadSize;
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kelondroRow.Entry exportedCollection = exportRow(chunkcachelength).newEntry(exportedCollectionRowinstance);
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this.chunkcount = (int) exportedCollection.getColLong(exp_chunkcount);
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//assert (this.chunkcount <= chunkcachelength / rowdef.objectsize) : "chunkcount = " + this.chunkcount + ", chunkcachelength = " + chunkcachelength + ", rowdef.objectsize = " + rowdef.objectsize;
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if ((this.chunkcount > chunkcachelength / rowdef.objectsize)) {
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serverLog.logWarning("RowCollection", "corrected wrong chunkcount; chunkcount = " + this.chunkcount + ", chunkcachelength = " + chunkcachelength + ", rowdef.objectsize = " + rowdef.objectsize);
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this.chunkcount = chunkcachelength / rowdef.objectsize; // patch problem
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}
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this.lastTimeRead = (exportedCollection.getColLong(exp_last_read) + 10957) * day;
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this.lastTimeWrote = (exportedCollection.getColLong(exp_last_wrote) + 10957) * day;
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String sortOrderKey = exportedCollection.getColString(exp_order_type, null);
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kelondroOrder oldOrder = null;
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if ((sortOrderKey == null) || (sortOrderKey.equals("__"))) {
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oldOrder = null;
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} else {
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oldOrder = kelondroNaturalOrder.bySignature(sortOrderKey);
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if (oldOrder == null) oldOrder = kelondroBase64Order.bySignature(sortOrderKey);
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}
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if ((rowdef.objectOrder != null) && (oldOrder != null) && (!(rowdef.objectOrder.signature().equals(oldOrder.signature()))))
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throw new kelondroException("old collection order does not match with new order");
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if (rowdef.primaryKey != (int) exportedCollection.getColLong(exp_order_col))
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throw new kelondroException("old collection primary key does not match with new primary key");
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this.sortBound = (int) exportedCollection.getColLong(exp_order_bound);
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//assert (sortBound <= chunkcount) : "sortBound = " + sortBound + ", chunkcount = " + chunkcount;
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if (sortBound > chunkcount) {
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serverLog.logWarning("RowCollection", "corrected wrong sortBound; sortBound = " + sortBound + ", chunkcount = " + chunkcount);
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this.sortBound = chunkcount;
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}
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this.chunkcache = exportedCollection.getColBytes(exp_collection);
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}
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private static final long day = 1000 * 60 * 60 * 24;
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public static int daysSince2000(long time) {
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return (int) (time / day) - 10957;
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}
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private kelondroRow exportRow(int chunkcachelength) {
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// find out the size of this collection
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return new kelondroRow(
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"int size-4 {b256}," +
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"short lastread-2 {b256}," + // as daysSince2000
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"short lastwrote-2 {b256}," + // as daysSince2000
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"byte[] orderkey-2," +
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"short ordercol-2 {b256}," +
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"short orderbound-2 {b256}," +
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"byte[] collection-" + chunkcachelength,
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null, 0
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);
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}
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public static final int exportOverheadSize = 14;
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public byte[] exportCollection() {
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// returns null if the collection is empty
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trim();
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kelondroRow row = exportRow(chunkcache.length);
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kelondroRow.Entry entry = row.newEntry();
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assert (sortBound <= chunkcount) : "sortBound = " + sortBound + ", chunkcount = " + chunkcount;
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assert (this.chunkcount <= chunkcache.length / rowdef.objectsize) : "chunkcount = " + this.chunkcount + ", chunkcache.length = " + chunkcache.length + ", rowdef.objectsize = " + rowdef.objectsize;
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entry.setCol(exp_chunkcount, this.chunkcount);
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entry.setCol(exp_last_read, daysSince2000(this.lastTimeRead));
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entry.setCol(exp_last_wrote, daysSince2000(this.lastTimeWrote));
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entry.setCol(exp_order_type, (this.rowdef.objectOrder == null) ? "__".getBytes() :this.rowdef.objectOrder.signature().getBytes());
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entry.setCol(exp_order_col, this.rowdef.primaryKey);
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entry.setCol(exp_order_bound, this.sortBound);
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entry.setCol(exp_collection, this.chunkcache);
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return entry.bytes();
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}
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public void saveCollection(File file) throws IOException {
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serverFileUtils.write(exportCollection(), file);
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}
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public kelondroRow row() {
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return this.rowdef;
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}
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private final void ensureSize(int elements) {
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int needed = elements * rowdef.objectsize();
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if (chunkcache.length >= needed) return;
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byte[] newChunkcache = new byte[(int) (needed * growfactor)]; // increase space
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System.arraycopy(chunkcache, 0, newChunkcache, 0, chunkcache.length);
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chunkcache = newChunkcache;
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newChunkcache = null;
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}
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public void trim() {
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if (chunkcache.length == 0) return;
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synchronized (chunkcache) {
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int needed = chunkcount * rowdef.objectsize();
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if (chunkcache.length == needed) return;
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byte[] newChunkcache = new byte[needed];
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System.arraycopy(chunkcache, 0, newChunkcache, 0, Math.min(chunkcache.length, newChunkcache.length));
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chunkcache = newChunkcache;
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newChunkcache = null;
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}
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}
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public final long lastRead() {
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return lastTimeRead;
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}
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public final long lastWrote() {
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return lastTimeWrote;
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}
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public final kelondroRow.Entry get(int index) {
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assert (index >= 0) : "get: access with index " + index + " is below zero";
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assert (index < chunkcount) : "get: access with index " + index + " is above chunkcount " + chunkcount + "; sortBound = " + sortBound;
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assert (index * rowdef.objectsize < chunkcache.length);
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if (index >= chunkcount) return null;
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if (index * rowdef.objectsize() >= chunkcache.length) return null;
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byte[] a = new byte[rowdef.objectsize()];
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synchronized (chunkcache) {
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System.arraycopy(chunkcache, index * rowdef.objectsize(), a, 0, rowdef.objectsize());
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}
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this.lastTimeRead = System.currentTimeMillis();
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return rowdef.newEntry(a);
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}
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public final void set(int index, kelondroRow.Entry a) {
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set(index, a.bytes(), 0, a.bytes().length);
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}
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public final void set(int index, byte[] a, int astart, int alength) {
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assert (index >= 0) : "get: access with index " + index + " is below zero";
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assert (index < chunkcount) : "get: access with index " + index + " is above chunkcount " + chunkcount;
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assert (!(bugappearance(a, astart, alength))) : "a = " + serverLog.arrayList(a, astart, alength);
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if (bugappearance(a, astart, alength)) return; // TODO: this is temporary; remote peers may still submit bad entries
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int l = Math.min(rowdef.objectsize(), Math.min(alength, a.length - astart));
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synchronized (chunkcache) {
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System.arraycopy(a, astart, chunkcache, index * rowdef.objectsize(), l);
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}
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this.lastTimeWrote = System.currentTimeMillis();
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}
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public void addUnique(kelondroRow.Entry row) {
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addUnique(row.bytes(), 0, row.bytes().length);
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}
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public void addUnique(kelondroRow.Entry row, Date entryDate) {
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addUnique(row);
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}
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public synchronized void addUniqueMultiple(List rows, Date entryDate) throws IOException {
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Iterator i = rows.iterator();
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while (i.hasNext()) addUnique((kelondroRow.Entry) i.next());
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}
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public void add(byte[] a) {
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addUnique(a, 0, a.length);
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}
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private final void addUnique(byte[] a, int astart, int alength) {
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assert (a != null);
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assert (astart >= 0) && (astart < a.length) : " astart = " + a;
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assert (!(serverLog.allZero(a, astart, alength))) : "a = " + serverLog.arrayList(a, astart, alength);
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assert (alength > 0);
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assert (astart + alength <= a.length);
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if (bugappearance(a, astart, alength)) {
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System.out.println("*** DEBUG: patched wrong a = " + serverLog.arrayList(a, astart, alength));
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return; // TODO: this is temporary; remote peers may still submit bad entries
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}
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assert (!(bugappearance(a, astart, alength))) : "a = " + serverLog.arrayList(a, astart, alength);
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int l = Math.min(rowdef.objectsize(), Math.min(alength, a.length - astart));
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synchronized (chunkcache) {
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ensureSize(chunkcount + 1);
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System.arraycopy(a, astart, chunkcache, rowdef.objectsize() * chunkcount, l);
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chunkcount++;
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}
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this.lastTimeWrote = System.currentTimeMillis();
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}
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private static boolean bugappearance(byte[] a, int astart, int alength) {
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// check strange appearances of '@[B', which is not a b64-value or any other hash fragment
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if (astart + 3 > alength) return false;
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loop: for (int i = astart; i <= alength - 3; i++) {
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if (a[i ] != 64) continue loop;
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if (a[i + 1] != 91) continue loop;
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if (a[i + 2] != 66) continue loop;
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return true;
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}
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return false;
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}
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public final void addAllUnique(kelondroRowCollection c) {
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if (c == null) return;
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assert(rowdef.objectsize() == c.rowdef.objectsize());
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synchronized(chunkcache) {
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ensureSize(chunkcount + c.size());
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System.arraycopy(c.chunkcache, 0, chunkcache, rowdef.objectsize() * chunkcount, rowdef.objectsize() * c.size());
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chunkcount += c.size();
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}
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}
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protected final void removeShift(int pos, int dist, int upBound) {
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assert ((pos + dist) * rowdef.objectsize() >= 0) : "pos = " + pos + ", dist = " + dist + ", rowdef.objectsize() = " + rowdef.objectsize;
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assert (pos * rowdef.objectsize() >= 0) : "pos = " + pos + ", rowdef.objectsize() = " + rowdef.objectsize;
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assert ((pos + dist) * rowdef.objectsize() + (upBound - pos - dist) * rowdef.objectsize() <= chunkcache.length) : "pos = " + pos + ", dist = " + dist + ", rowdef.objectsize() = " + rowdef.objectsize + ", upBound = " + upBound + ", chunkcache.length = " + chunkcache.length;
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assert (pos * rowdef.objectsize() + (upBound - pos - dist) * rowdef.objectsize() <= chunkcache.length) : "pos = " + pos + ", dist = " + dist + ", rowdef.objectsize() = " + rowdef.objectsize + ", upBound = " + upBound + ", chunkcache.length = " + chunkcache.length;
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System.arraycopy(chunkcache, (pos + dist) * rowdef.objectsize(),
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chunkcache, pos * rowdef.objectsize(),
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(upBound - pos - dist) * rowdef.objectsize());
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}
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protected final void copytop(int i) {
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// copies the topmost row element to given position
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if (i == chunkcount - 1) return;
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System.arraycopy(chunkcache, this.rowdef.objectsize() * (chunkcount - 1), chunkcache, this.rowdef.objectsize() * i, this.rowdef.objectsize());
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}
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protected final void removeRow(int p) {
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assert ((p >= 0) && (p < chunkcount) && (chunkcount > 0)) : "p = " + p + ", chunkcount = " + chunkcount;
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synchronized (chunkcache) {
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if (p < sortBound) {
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sortBound--;
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removeShift(p, 1, chunkcount);
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chunkcount--;
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} else {
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copytop(p);
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chunkcount--;
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}
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}
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this.lastTimeWrote = System.currentTimeMillis();
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}
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public kelondroRow.Entry removeOne() {
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synchronized (chunkcache) {
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if (chunkcount == 0) return null;
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kelondroRow.Entry r = get(chunkcount - 1);
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if (chunkcount == sortBound) sortBound--;
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chunkcount--;
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this.lastTimeWrote = System.currentTimeMillis();
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return r;
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}
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}
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public void clear() {
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this.chunkcache = new byte[0];
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this.chunkcount = 0;
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this.sortBound = 0;
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this.lastTimeWrote = System.currentTimeMillis();
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}
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public int size() {
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return chunkcount;
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}
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public Iterator rows() {
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// iterates kelondroRow.Entry - type entries
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return new rowIterator();
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}
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public class rowIterator implements Iterator {
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private int p;
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public rowIterator() {
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p = 0;
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}
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public boolean hasNext() {
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return p < chunkcount;
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}
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public Object next() {
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return get(p++);
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}
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public void remove() {
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p--;
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removeRow(p);
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}
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}
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public void select(Set keys) {
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// removes all entries but the ones given by urlselection
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if ((keys == null) || (keys.size() == 0)) return;
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synchronized (this) {
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Iterator i = rows();
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kelondroRow.Entry row;
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while (i.hasNext()) {
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row = (kelondroRow.Entry) i.next();
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if (!(keys.contains(row.getColString(0, null)))) i.remove();
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}
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}
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}
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protected final void sort() {
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assert (this.rowdef.objectOrder != null);
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if (this.sortBound == this.chunkcount) return; // this is already sorted
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//System.out.println("SORT(chunkcount=" + this.chunkcount + ", sortBound=" + this.sortBound + ")");
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if (this.sortBound > 1) {
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qsort(0, this.sortBound, this.chunkcount);
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} else {
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qsort(0, this.chunkcount);
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}
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this.sortBound = this.chunkcount;
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}
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private final void qsort(int L, int S, int R) {
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//System.out.println("QSORT: chunkcache.length=" + chunkcache.length + ", chunksize=" + chunksize + ", L=" + L + ", S=" + S + ", R=" + R);
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assert (S <= R) : "S > R: S = " + S + ", R = " + R;
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if (L >= R - 1) return;
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if (S >= R) return;
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if (R - L < 20) {
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isort(L, R);
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return;
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}
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int p = L + ((S - L) / 2);
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int ps = p;
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int q = S;
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int qs = q;
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int pivot = p;
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while (q < R) {
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if (compare(pivot, q) < 1) {
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q++;
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} else {
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pivot = swap(p, q, pivot);
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p++;
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q++;
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}
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}
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if ((ps - L) <= ((p - L) / 2)) qsort(L, p); else qsort(L, ps, p);
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if ((qs - p) <= ((R - p) / 2)) qsort(p, R); else qsort(p, qs, R);
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}
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private final void qsort(int L, int R) {
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//System.out.println("QSORT: chunkcache.length=" + chunkcache.length + ", L=" + L + "/" + new String(this.chunkcache, L * this.rowdef.objectsize(), this.rowdef.width(0)) + ", R=" + R + "/" + new String(this.chunkcache, (R - 1) * this.rowdef.objectsize(), this.rowdef.width(0)));
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/*
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if ((L == 190) && (R == 258)) {
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for (int i = L; i < R; i++) {
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System.out.print(new String(this.chunkcache, L * this.chunksize, this.chunksize) + ", ");
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}
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System.out.println();
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}
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*/
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if (L >= R - 1) return;
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if (R - L < 20) {
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isort(L, R);
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return;
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}
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int i = L;
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int j = R - 1;
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int pivot = (i + j) / 2;
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//System.out.println("Pivot=" + pivot + "/" + new String(this.chunkcache, pivot * this.rowdef.objectsize(), this.rowdef.width(0)));
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while (i <= j) {
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while (compare(pivot, i) == 1) i++; // chunkAt[i] < keybuffer
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while (compare(pivot, j) == -1) j--; // chunkAt[j] > keybuffer
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//if (L == 6693) System.out.println(i + ", " + j);
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if (i <= j) {
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pivot = swap(i, j, pivot);
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i++;
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j--;
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}
|
|
}
|
|
//if (L == 6693) System.out.println(i);
|
|
qsort(L, i);
|
|
qsort(i, R);
|
|
}
|
|
|
|
private final void isort(int L, int R) {
|
|
for (int i = L + 1; i < R; i++)
|
|
for (int j = i; j > L && compare(j - 1, j) > 0; j--)
|
|
swap(j, j - 1, 0);
|
|
}
|
|
|
|
protected final int swap(int i, int j, int p) {
|
|
if (i == j) return p;
|
|
if ((this.chunkcount + 1) * this.rowdef.objectsize() < this.chunkcache.length) {
|
|
// there is space in the chunkcache that we can use as buffer
|
|
System.arraycopy(chunkcache, this.rowdef.objectsize() * i, chunkcache, chunkcache.length - this.rowdef.objectsize(), this.rowdef.objectsize());
|
|
System.arraycopy(chunkcache, this.rowdef.objectsize() * j, chunkcache, this.rowdef.objectsize() * i, this.rowdef.objectsize());
|
|
System.arraycopy(chunkcache, chunkcache.length - this.rowdef.objectsize(), chunkcache, this.rowdef.objectsize() * j, this.rowdef.objectsize());
|
|
} else {
|
|
// allocate a chunk to use as buffer
|
|
byte[] a = new byte[this.rowdef.objectsize()];
|
|
System.arraycopy(chunkcache, this.rowdef.objectsize() * i, a, 0, this.rowdef.objectsize());
|
|
System.arraycopy(chunkcache, this.rowdef.objectsize() * j, chunkcache, this.rowdef.objectsize() * i, this.rowdef.objectsize());
|
|
System.arraycopy(a, 0, chunkcache, this.rowdef.objectsize() * j, this.rowdef.objectsize());
|
|
}
|
|
if (i == p) return j; else if (j == p) return i; else return p;
|
|
}
|
|
|
|
public void uniq() {
|
|
assert (this.rowdef.objectOrder != null);
|
|
// removes double-occurrences of chunks
|
|
// this works only if the collection was ordered with sort before
|
|
synchronized (chunkcache) {
|
|
if (chunkcount <= 1) return;
|
|
int i = 0;
|
|
while (i < chunkcount - 1) {
|
|
if (compare(i, i + 1) == 0) {
|
|
//System.out.println("DOUBLE: " + new String(this.chunkcache, this.chunksize * i, this.chunksize));
|
|
removeRow(i);
|
|
} else {
|
|
i++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
public String toString() {
|
|
StringBuffer s = new StringBuffer();
|
|
Iterator i = rows();
|
|
if (i.hasNext()) s.append(((kelondroRow.Entry) i.next()).toString());
|
|
while (i.hasNext()) s.append(", " + ((kelondroRow.Entry) i.next()).toString());
|
|
return new String(s);
|
|
}
|
|
|
|
private final int compare(int i, int j) {
|
|
assert (chunkcount * this.rowdef.objectsize() <= chunkcache.length) : "chunkcount = " + chunkcount + ", objsize = " + this.rowdef.objectsize() + ", chunkcache.length = " + chunkcache.length;
|
|
assert (i >= 0) && (i < chunkcount) : "i = " + i + ", chunkcount = " + chunkcount;
|
|
assert (j >= 0) && (j < chunkcount) : "j = " + j + ", chunkcount = " + chunkcount;
|
|
assert (this.rowdef.objectOrder != null);
|
|
if (i == j) return 0;
|
|
assert (this.rowdef.primaryKey == 0) : "this.sortColumn = " + this.rowdef.primaryKey;
|
|
int keylength = this.rowdef.width(this.rowdef.primaryKey);
|
|
int colstart = this.rowdef.colstart[this.rowdef.primaryKey];
|
|
if (bugappearance(chunkcache, i * this.rowdef.objectsize() + colstart, keylength)) throw new kelondroException("bugappearance i");
|
|
if (bugappearance(chunkcache, j * this.rowdef.objectsize() + colstart, keylength)) throw new kelondroException("bugappearance j");
|
|
int c = this.rowdef.objectOrder.compare(
|
|
chunkcache,
|
|
i * this.rowdef.objectsize() + colstart,
|
|
keylength,
|
|
chunkcache,
|
|
j * this.rowdef.objectsize() + colstart,
|
|
keylength);
|
|
return c;
|
|
}
|
|
|
|
public static void main(String[] args) {
|
|
System.out.println(new java.util.Date(10957 * day));
|
|
System.out.println(new java.util.Date(0));
|
|
System.out.println(daysSince2000(System.currentTimeMillis()));
|
|
}
|
|
}
|