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git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@5921 6c8d7289-2bf4-0310-a012-ef5d649a1542
635 lines
24 KiB
Java
635 lines
24 KiB
Java
// kelondroRowSet.java
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// (C) 2006 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 20.06.2006 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.index;
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import java.io.DataInput;
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import java.io.IOException;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Random;
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import de.anomic.kelondro.order.Base64Order;
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import de.anomic.kelondro.order.CloneableIterator;
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import de.anomic.kelondro.order.NaturalOrder;
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import de.anomic.kelondro.util.Log;
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public class RowSet extends RowCollection implements ObjectIndex, Iterable<Row.Entry> {
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private static final int collectionReSortLimit = 300;
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public RowSet(final RowSet rs) {
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super(rs);
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}
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public RowSet(final Row rowdef, final int objectCount, final byte[] cache, final int sortBound) {
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super(rowdef, objectCount, cache, sortBound);
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assert rowdef.objectOrder != null;
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}
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public RowSet(final Row rowdef, final int objectCount) {
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super(rowdef, objectCount);
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assert rowdef.objectOrder != null;
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}
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/**
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* import an exported collection
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* @param rowdef
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* @param exportedCollectionRowEnvironment
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* @param columnInEnvironment
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*/
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public RowSet(final Row rowdef, final Row.Entry exportedCollectionRowEnvironment) {
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super(rowdef, exportedCollectionRowEnvironment);
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assert rowdef.objectOrder != null;
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}
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public static RowSet importRowSet(final DataInput is, final Row rowdef) throws IOException {
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final byte[] byte6 = new byte[6];
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final int size = is.readInt();
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is.readFully(byte6);
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//short lastread = (short) kelondroNaturalOrder.decodeLong(byte2);
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//short lastwrote = (short) kelondroNaturalOrder.decodeLong(byte2);
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//String orderkey = new String(byte2);
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final int orderbound = is.readInt();
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final byte[] chunkcache = new byte[size * rowdef.objectsize];
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is.readFully(chunkcache);
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return new RowSet(rowdef, size, chunkcache, orderbound);
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}
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public static RowSet importRowSet(byte[] b, final Row rowdef) {
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assert b.length >= 14 : "b.length = " + b.length;
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final int size = (int) NaturalOrder.decodeLong(b, 0, 4);
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final int orderbound = (int) NaturalOrder.decodeLong(b, 10, 4);
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final byte[] chunkcache = new byte[size * rowdef.objectsize];
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assert b.length - exportOverheadSize == size * rowdef.objectsize;
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System.arraycopy(b, 14, chunkcache, 0, chunkcache.length);
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return new RowSet(rowdef, size, chunkcache, orderbound);
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}
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public void reset() {
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super.reset();
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}
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public synchronized boolean has(final byte[] key) {
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final int index = find(key, 0, key.length);
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return index >= 0;
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}
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public synchronized Row.Entry get(final byte[] key) {
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return get(key, 0, key.length);
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}
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private Row.Entry get(final byte[] key, final int astart, final int alength) {
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final int index = find(key, astart, alength);
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final Row.Entry entry = (index >= 0) ? get(index, true) : null;
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return entry;
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}
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public synchronized void put(final List<Row.Entry> rows) {
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final Iterator<Row.Entry> i = rows.iterator();
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while (i.hasNext()) put(i.next());
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}
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public synchronized void put(final Row.Entry entry) {
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assert (entry != null);
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assert (entry.getPrimaryKeyBytes() != null);
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// when reaching a specific amount of un-sorted entries, re-sort all
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if ((this.chunkcount - this.sortBound) > collectionReSortLimit) {
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sort();
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}
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int index = find(entry.bytes(), 0, super.rowdef.primaryKeyLength);
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if (index < 0) {
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super.addUnique(entry);
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} else {
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int sb = this.sortBound; // save the sortBound, because it is not altered (we replace at the same place)
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set(index, entry); // this may alter the sortBound, which we will revert in the next step
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this.sortBound = sb; // revert a sortBound altering
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}
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}
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public synchronized Row.Entry replace(final Row.Entry entry) {
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assert (entry != null);
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assert (entry.getPrimaryKeyBytes() != null);
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int index = -1;
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Row.Entry oldentry = null;
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// when reaching a specific amount of un-sorted entries, re-sort all
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if ((this.chunkcount - this.sortBound) > collectionReSortLimit) {
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sort();
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}
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index = find(entry.bytes(), 0, super.rowdef.primaryKeyLength);
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if (index < 0) {
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super.addUnique(entry);
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} else {
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oldentry = get(index, true);
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int sb = this.sortBound; // save the sortBound, because it is not altered (we replace at the same place)
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set(index, entry); // this may alter the sortBound, which we will revert in the next step
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this.sortBound = sb; // revert a sortBound altering
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}
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return oldentry;
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}
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public synchronized long inc(byte[] key, int col, long add, Row.Entry initrow) {
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final int index = find(key, 0, key.length);
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if (index >= 0) {
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// the entry existed before
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final Row.Entry entry = get(index, false); // no clone necessary
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long l = entry.incCol(col, add);
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set(index, entry);
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return l;
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} else if (initrow != null) {
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// create new entry
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super.addUnique(initrow);
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return initrow.getColLong(col);
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} else {
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// if initrow == null just do nothing
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// but return a Long.MIN_VALUE
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return Long.MIN_VALUE;
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}
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}
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private synchronized Row.Entry remove(final byte[] a, final int start, final int length) {
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final int index = find(a, start, length);
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if (index < 0) return null;
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final Row.Entry entry = super.get(index, true);
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super.removeRow(index, true); // keep order of collection!
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int findagainindex = 0;
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assert (findagainindex = find(a, start, length)) < 0 : "remove: chunk found again at index position (after remove) " + findagainindex + ", index(before) = " + index + ", inset=" + NaturalOrder.arrayList(super.chunkcache, super.rowdef.objectsize * findagainindex, length) + ", searchkey=" + NaturalOrder.arrayList(a, start, length); // check if the remove worked
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return entry;
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}
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/**
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* remove a byte[] from the set.
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* if the entry was found, return the entry, but delete the entry from the set
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* if the entry was not found, return null.
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*/
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public Row.Entry remove(final byte[] a) {
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return remove(a, 0, a.length);
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}
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private int find(final byte[] a, final int astart, final int alength) {
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// returns the chunknumber; -1 if not found
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if (rowdef.objectOrder == null) return iterativeSearch(a, astart, alength, 0, this.chunkcount);
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if ((this.chunkcount - this.sortBound) > collectionReSortLimit) {
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sort();
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}
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if ((this.rowdef.objectOrder != null) && (this.rowdef.objectOrder instanceof Base64Order) && (this.sortBound > 4000)) {
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// first try to find in sorted area
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assert this.rowdef.objectOrder.wellformed(a, astart, alength) : "not wellformed: " + new String(a, astart, alength);
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final int p = binarySearch(a, astart, alength);
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if (p >= 0) return p;
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// then find in unsorted area
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return iterativeSearch(a, astart, alength, this.sortBound, this.chunkcount);
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} else {
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// first try to find in sorted area
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final int p = binarySearch(a, astart, alength);
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if (p >= 0) return p;
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// then find in unsorted area
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return iterativeSearch(a, astart, alength, this.sortBound, this.chunkcount);
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}
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}
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private int iterativeSearch(final byte[] key, final int astart, final int alength, final int leftBorder, final int rightBound) {
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// returns the chunknumber
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for (int i = leftBorder; i < rightBound; i++) {
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if (match(key, astart, alength, i)) return i;
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}
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return -1;
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}
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private int binarySearch(final byte[] key, final int astart, final int alength) {
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// returns the exact position of the key if the key exists,
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// or -1 if the key does not exist
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assert (rowdef.objectOrder != null);
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int l = 0;
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int rbound = this.sortBound;
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int p = 0;
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int d;
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while (l < rbound) {
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p = l + ((rbound - l) >> 1);
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d = compare(key, astart, alength, p);
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if (d == 0) return p;
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if (d < 0) rbound = p; else l = p + 1;
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}
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return -1;
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}
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private int binaryPosition(final byte[] key, final int astart, final int alength) {
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// returns the exact position of the key if the key exists,
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// or a position of an entry that is greater than the key if the
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// key does not exist
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assert (rowdef.objectOrder != null);
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int l = 0;
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int rbound = this.sortBound;
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int p = 0;
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int d;
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while (l < rbound) {
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p = l + ((rbound - l) >> 1);
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d = compare(key, astart, alength, p);
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if (d == 0) return p;
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if (d < 0) rbound = p; else l = p + 1;
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}
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return l;
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}
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public synchronized Iterator<byte[]> keys() {
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sort();
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return super.keys(true);
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}
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public synchronized CloneableIterator<byte[]> keys(final boolean up, final byte[] firstKey) {
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return new keyIterator(up, firstKey);
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}
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public class keyIterator implements CloneableIterator<byte[]> {
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private final boolean up;
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private final byte[] first;
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private int p;
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final int bound;
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public keyIterator(final boolean up, final byte[] firstKey) {
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// see that all elements are sorted
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sort();
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this.up = up;
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this.first = firstKey;
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this.bound = sortBound;
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if (first == null) {
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p = 0;
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} else {
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p = binaryPosition(first, 0, first.length); // check this to find bug in DHT selection enumeration
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//System.out.println("binaryposition for key " + new String(firstKey) + " is " + p);
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}
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}
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public keyIterator clone(final Object second) {
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return new keyIterator(up, (byte[]) second);
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}
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public boolean hasNext() {
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if (p < 0) return false;
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if (p >= size()) return false;
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if (up) {
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return p < bound;
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} else {
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return p >= 0;
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}
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}
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public byte[] next() {
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final byte[] key = getKey(p);
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if (up) p++; else p--;
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return key;
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}
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public void remove() {
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throw new UnsupportedOperationException();
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}
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}
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public synchronized Iterator<Row.Entry> iterator() {
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// iterates kelondroRow.Entry - type entries
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sort();
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return super.iterator();
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}
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public synchronized CloneableIterator<Row.Entry> rows(final boolean up, final byte[] firstKey) {
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return new rowIterator(up, firstKey);
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}
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public synchronized CloneableIterator<Row.Entry> rows() {
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return new rowIterator(true, null);
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}
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public class rowIterator implements CloneableIterator<Row.Entry> {
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private final boolean up;
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private final byte[] first;
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private int p;
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final int bound;
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public rowIterator(final boolean up, final byte[] firstKey) {
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// see that all elements are sorted
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sort();
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this.up = up;
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this.first = firstKey;
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this.bound = sortBound;
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if (first == null) {
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p = 0;
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} else {
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p = binaryPosition(first, 0, first.length); // check this to find bug in DHT selection enumeration
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//System.out.println("binaryposition for key " + new String(firstKey) + " is " + p);
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}
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}
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public rowIterator clone(final Object second) {
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return new rowIterator(up, (byte[]) second);
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}
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public boolean hasNext() {
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if (p < 0) return false;
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if (p >= size()) return false;
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if (up) {
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return p < bound;
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} else {
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return p >= 0;
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}
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}
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public Row.Entry next() {
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final Row.Entry entry = get(p, true);
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if (up) p++; else p--;
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return entry;
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}
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public void remove() {
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throw new UnsupportedOperationException();
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}
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}
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/**
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* merge this row collection with another row collection.
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* The resulting collection is sorted and does not contain any doubles, which are also removed during the merge.
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* The new collection may be a copy of one of the old one, or can be an alteration of one of the input collections
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* After this merge, none of the input collections should be used, because they can be altered
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* @param c
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* @return
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*/
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public RowSet merge(RowSet c) {
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assert c != null;
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/*
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if (this.isSorted() && this.size() >= c.size()) {
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return mergeInsert(this, c);
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}*/
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return mergeEnum(this, c);
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}
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/*
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private static kelondroRowSet mergeInsert(kelondroRowSet sorted, kelondroRowCollection small) {
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assert sorted.rowdef == small.rowdef;
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assert sorted.isSorted();
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assert small.size() <= sorted.size();
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sorted.ensureSize(sorted.size() + small.size());
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for (int i = 0; i < small.size(); i++) {
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}
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return sorted;
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}
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*/
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/**
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* merge this row collection with another row collection using an simultanous iteration of the input collections
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* the current collection is not altered in any way, the returned collection is a new collection with copied content.
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* @param c
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* @return
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*/
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protected static RowSet mergeEnum(RowCollection c0, RowCollection c1) {
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assert c0.rowdef == c1.rowdef : c0.rowdef.toString() + " != " + c1.rowdef.toString();
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RowSet r = new RowSet(c0.rowdef, c0.size() + c1.size());
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try {
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c0.sort();
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} catch (Exception e) {
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Log.logSevere("RowSet", "collection corrupted. cleaned. " + e.getMessage());
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e.printStackTrace();
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c0.clear();
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}
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try {
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c1.sort();
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} catch (Exception e) {
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Log.logSevere("RowSet", "collection corrupted. cleaned. " + e.getMessage());
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e.printStackTrace();
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c1.clear();
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}
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int c0i = 0, c1i = 0;
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int c0p, c1p;
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int o;
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final int objectsize = c0.rowdef.objectsize;
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while (c0i < c0.size() && c1i < c1.size()) {
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c0p = c0i * objectsize;
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c1p = c1i * objectsize;
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o = c0.rowdef.objectOrder.compare(
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c0.chunkcache, c0p, c0.rowdef.primaryKeyLength,
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c1.chunkcache, c1p, c0.rowdef.primaryKeyLength);
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if (o == 0) {
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r.addSorted(c0.chunkcache, c0p, objectsize);
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c0i++;
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c1i++;
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continue;
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}
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if (o < 0) {
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r.addSorted(c0.chunkcache, c0p, objectsize);
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c0i++;
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continue;
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}
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if (o > 0) {
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r.addSorted(c1.chunkcache, c1p, objectsize);
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c1i++;
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continue;
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}
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}
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while (c0i < c0.size()) {
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r.addSorted(c0.chunkcache, c0i * objectsize, objectsize);
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c0i++;
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}
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while (c1i < c1.size()) {
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r.addSorted(c1.chunkcache, c1i * objectsize, objectsize);
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c1i++;
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}
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return r;
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}
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public static void main(final String[] args) {
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// sort/uniq-test
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/*
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kelondroRow rowdef = new kelondroRow("Cardinal key-4 {b256}, byte[] payload-1", kelondroNaturalOrder.naturalOrder, 0);
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kelondroRowSet rs = new kelondroRowSet(rowdef, 0);
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Random random = new Random(0);
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kelondroRow.Entry entry;
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for (int i = 0; i < 10000000; i++) {
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entry = rowdef.newEntry();
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entry.setCol(0, Math.abs(random.nextLong() % 1000000));
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entry.setCol(1, "a".getBytes());
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rs.addUnique(entry);
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}
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System.out.println("before sort, size = " + rs.size());
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rs.sort();
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System.out.println("after sort, before uniq, size = " + rs.size());
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rs.uniq(10000);
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System.out.println("after uniq, size = " + rs.size());
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*/
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final String[] test = {
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"eins......xxxx",
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"zwei......xxxx",
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"drei......xxxx",
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"vier......xxxx",
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"fuenf.....xxxx",
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"sechs.....xxxx",
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"sieben....xxxx",
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"acht......xxxx",
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"neun......xxxx",
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"zehn......xxxx" };
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final RowSet d = new RowSet(new Row("byte[] key-10, Cardinal x-4 {b256}", NaturalOrder.naturalOrder), 0);
|
|
for (int ii = 0; ii < test.length; ii++) d.add(test[ii].getBytes());
|
|
for (int ii = 0; ii < test.length; ii++) d.add(test[ii].getBytes());
|
|
d.sort();
|
|
d.remove("fuenf".getBytes(), 0, 5);
|
|
final Iterator<Row.Entry> ii = d.iterator();
|
|
String s;
|
|
System.out.print("INPUT-ITERATOR: ");
|
|
Row.Entry entry;
|
|
while (ii.hasNext()) {
|
|
entry = ii.next();
|
|
s = new String(entry.getColBytes(0)).trim();
|
|
System.out.print(s + ", ");
|
|
if (s.equals("drei")) ii.remove();
|
|
}
|
|
System.out.println("");
|
|
System.out.println("INPUT-TOSTRING: " + d.toString());
|
|
d.sort();
|
|
System.out.println("SORTED : " + d.toString());
|
|
d.uniq();
|
|
System.out.println("UNIQ : " + d.toString());
|
|
d.trim(false);
|
|
System.out.println("TRIM : " + d.toString());
|
|
|
|
|
|
/*
|
|
// second test
|
|
c = new kelondroRowSet(new kelondroRow(new int[]{10, 3}));
|
|
c.setOrdering(kelondroNaturalOrder.naturalOrder, 0);
|
|
Random rand = new Random(0);
|
|
long start = System.currentTimeMillis();
|
|
long t, d = 0;
|
|
String w;
|
|
for (long k = 0; k < 60000; k++) {
|
|
t = System.currentTimeMillis();
|
|
w = "a" + Long.toString(rand.nextLong());
|
|
c.add(w.getBytes());
|
|
if (k % 10000 == 0)
|
|
System.out.println("added " + k + " entries in " +
|
|
((t - start) / 1000) + " seconds, " +
|
|
(((t - start) > 1000) ? (k / ((t - start) / 1000)) : k) +
|
|
" entries/second, size = " + c.size());
|
|
}
|
|
System.out.println("bevore sort: " + ((System.currentTimeMillis() - start) / 1000) + " seconds");
|
|
c.shape();
|
|
System.out.println("after sort: " + ((System.currentTimeMillis() - start) / 1000) + " seconds");
|
|
c.uniq();
|
|
System.out.println("after uniq: " + ((System.currentTimeMillis() - start) / 1000) + " seconds");
|
|
System.out.println("RESULT SIZE: " + c.size());
|
|
System.out.println();
|
|
|
|
// third test
|
|
c = new kelondroRowSet(new kelondroRow(new int[]{10, 3}), 60000);
|
|
c.setOrdering(kelondroNaturalOrder.naturalOrder, 0);
|
|
rand = new Random(0);
|
|
start = System.currentTimeMillis();
|
|
d = 0;
|
|
for (long k = 0; k < 60000; k++) {
|
|
t = System.currentTimeMillis();
|
|
w = "a" + Long.toString(rand.nextLong());
|
|
if (c.get(w.getBytes(), 0, 10) == null) c.add(w.getBytes()); else d++;
|
|
if (k % 10000 == 0)
|
|
System.out.println("added " + k + " entries in " +
|
|
((t - start) / 1000) + " seconds, " +
|
|
(((t - start) > 1000) ? (k / ((t - start) / 1000)) : k) +
|
|
" entries/second, " + d + " double, size = " + c.size() +
|
|
", sum = " + (c.size() + d));
|
|
}
|
|
System.out.println("RESULT SIZE: " + c.size());
|
|
*/
|
|
/*
|
|
// performance test for put
|
|
long start = System.currentTimeMillis();
|
|
kelondroRowSet c = new kelondroRowSet(new kelondroRow("byte[] a-12, byte[] b-12"), 0);
|
|
Random random = new Random(0);
|
|
byte[] key;
|
|
for (int i = 0; i < 100000; i++) {
|
|
key = randomHash(random);
|
|
c.put(c.rowdef.newEntry(new byte[][]{key, key}));
|
|
if (i % 1000 == 0) System.out.println(i + " entries. ");
|
|
}
|
|
System.out.println("RESULT SIZE: " + c.size());
|
|
System.out.println("Time: " + ((System.currentTimeMillis() - start) / 1000) + " seconds");
|
|
*/
|
|
|
|
// remove test
|
|
final long start = System.currentTimeMillis();
|
|
final RowSet c = new RowSet(new Row("byte[] a-12, byte[] b-12", Base64Order.enhancedCoder), 0);
|
|
byte[] key;
|
|
final int testsize = 5000;
|
|
final byte[][] delkeys = new byte[testsize / 5][];
|
|
Random random = new Random(0);
|
|
for (int i = 0; i < testsize; i++) {
|
|
key = randomHash(random);
|
|
if (i % 5 != 0) continue;
|
|
delkeys[i / 5] = key;
|
|
}
|
|
random = new Random(0);
|
|
for (int i = 0; i < testsize; i++) {
|
|
key = randomHash(random);
|
|
c.put(c.rowdef.newEntry(new byte[][]{key, key}));
|
|
if (i % 1000 == 0) {
|
|
for (int j = 0; j < delkeys.length; j++) c.remove(delkeys[j]);
|
|
c.sort();
|
|
}
|
|
}
|
|
for (int j = 0; j < delkeys.length; j++) c.remove(delkeys[j]);
|
|
c.sort();
|
|
random = new Random(0);
|
|
for (int i = 0; i < testsize; i++) {
|
|
key = randomHash(random);
|
|
if (i % 5 == 0) continue;
|
|
if (c.get(key) == null) System.out.println("missing entry " + new String(key));
|
|
}
|
|
c.sort();
|
|
System.out.println("RESULT SIZE: " + c.size());
|
|
System.out.println("Time: " + ((System.currentTimeMillis() - start) / 1000) + " seconds");
|
|
}
|
|
|
|
public static byte[] randomHash(final long r0, final long r1) {
|
|
// a long can have 64 bit, but a 12-byte hash can have 6 * 12 = 72 bits
|
|
// so we construct a generic Hash using two long values
|
|
return (Base64Order.enhancedCoder.encodeLong(Math.abs(r0), 11).substring(5) +
|
|
Base64Order.enhancedCoder.encodeLong(Math.abs(r1), 11).substring(5)).getBytes();
|
|
}
|
|
public static byte[] randomHash(final Random r) {
|
|
return randomHash(r.nextLong(), r.nextLong());
|
|
}
|
|
|
|
public String filename() {
|
|
return null;
|
|
}
|
|
|
|
public void deleteOnExit() {
|
|
// do nothing, there is no file
|
|
}
|
|
|
|
}
|