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200 lines
8.0 KiB
200 lines
8.0 KiB
// kelondroRelations.java
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// (C) 2008 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 3.07.2008 on http://yacy.net
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// $LastChangedDate: 2008-03-14 01:16:04 +0100 (Fr, 14 Mrz 2008) $
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// $LastChangedRevision: 4558 $
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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 net.yacy.kelondro.table;
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import java.io.File;
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import java.io.IOException;
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import java.util.HashMap;
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import net.yacy.kelondro.index.Index;
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import net.yacy.kelondro.index.Row;
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import net.yacy.kelondro.index.RowSpaceExceededException;
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import net.yacy.kelondro.logging.Log;
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import net.yacy.kelondro.order.NaturalOrder;
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public class Relations {
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private final File baseDir;
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private HashMap<String, Index> relations;
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private final boolean useTailCache;
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private final boolean exceed134217727;
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public Relations(
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final File location,
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final boolean useTailCache,
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final boolean exceed134217727) {
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this.baseDir = location;
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this.useTailCache = useTailCache;
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this.exceed134217727 = exceed134217727;
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}
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private static Row rowdef(String filename) {
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int p = filename.lastIndexOf('.');
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if (p >= 0) filename = filename.substring(0, p);
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p = filename.lastIndexOf('-');
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assert p >= 0;
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final int payloadsize = Integer.parseInt(filename.substring(p + 1));
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filename = filename.substring(0, p);
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p = filename.lastIndexOf('-');
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assert p >= 0;
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final int keysize = Integer.parseInt(filename.substring(p + 1));
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return rowdef(keysize, payloadsize);
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}
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private static Row rowdef(final int keysize, final int payloadsize) {
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return new Row(
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"byte[] key-" + keysize + ", " +
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"long time-8" + keysize + ", " +
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"int ttl-4" + keysize + ", " +
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"byte[] node-" + payloadsize,
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NaturalOrder.naturalOrder);
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}
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private static String filename(final String tablename, final int keysize, final int payloadsize) {
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return tablename + "-" + keysize + "-" + payloadsize + ".eco";
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}
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public void declareRelation(final String name, final int keysize, final int payloadsize) throws RowSpaceExceededException {
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// try to get the relation from the relation-cache
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final Index relation = relations.get(name);
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if (relation != null) return;
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// try to find the relation as stored on file
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final String[] list = baseDir.list();
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final String targetfilename = filename(name, keysize, payloadsize);
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for (int i = 0; i < list.length; i++) {
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if (list[i].startsWith(name)) {
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if (!list[i].equals(targetfilename)) continue;
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final Row row = rowdef(list[i]);
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if (row.primaryKeyLength != keysize || row.column(1).cellwidth != payloadsize) continue; // a wrong table
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Index table;
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try {
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table = new Table(new File(baseDir, list[i]), row, 1024*1024, 0, this.useTailCache, this.exceed134217727);
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} catch (RowSpaceExceededException e) {
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table = new Table(new File(baseDir, list[i]), row, 0, 0, false, this.exceed134217727);
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}
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relations.put(name, table);
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return;
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}
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}
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// the relation does not exist, create it
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final Row row = rowdef(keysize, payloadsize);
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Index table;
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try {
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table = new Table(new File(baseDir, targetfilename), row, 1024*1024, 0, this.useTailCache, this.exceed134217727);
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} catch (RowSpaceExceededException e) {
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table = new Table(new File(baseDir, targetfilename), row, 0, 0, false, this.exceed134217727);
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}
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relations.put(name, table);
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}
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public Index getRelation(final String name) throws RowSpaceExceededException {
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// try to get the relation from the relation-cache
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final Index relation = relations.get(name);
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if (relation != null) return relation;
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// try to find the relation as stored on file
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final String[] list = baseDir.list();
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for (int i = 0; i < list.length; i++) {
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if (list[i].startsWith(name)) {
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final Row row = rowdef(list[i]);
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Index table;
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try {
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table = new Table(new File(baseDir, list[i]), row, 1024*1024, 0, this.useTailCache, this.exceed134217727);
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} catch (RowSpaceExceededException e) {
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table = new Table(new File(baseDir, list[i]), row, 0, 0, false, this.exceed134217727);
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}
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relations.put(name, table);
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return table;
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}
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}
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// the relation does not exist
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return null;
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}
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public String putRelation(final String name, final String key, final String value) throws IOException, RowSpaceExceededException {
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final byte[] r = putRelation(name, key.getBytes(), value.getBytes());
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if (r == null) return null;
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return new String(r);
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}
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public byte[] putRelation(final String name, final byte[] key, final byte[] value) throws IOException, RowSpaceExceededException {
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final Index table = getRelation(name);
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if (table == null) return null;
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final Row.Entry entry = table.row().newEntry();
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entry.setCol(0, key);
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entry.setCol(1, System.currentTimeMillis());
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entry.setCol(2, 1000000);
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entry.setCol(3, value);
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final Row.Entry oldentry = table.replace(entry);
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if (oldentry == null) return null;
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return oldentry.getColBytes(3, true);
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}
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public String getRelation(final String name, final String key) throws IOException, RowSpaceExceededException {
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final byte[] r = getRelation(name, key.getBytes());
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if (r == null) return null;
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return new String(r);
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}
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public byte[] getRelation(final String name, final byte[] key) throws IOException, RowSpaceExceededException {
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final Index table = getRelation(name);
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if (table == null) return null;
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final Row.Entry entry = table.get(key);
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if (entry == null) return null;
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return entry.getColBytes(3, true);
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}
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public boolean hasRelation(final String name, final byte[] key) throws RowSpaceExceededException {
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final Index table = getRelation(name);
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if (table == null) return false;
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return table.has(key);
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}
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public byte[] removeRelation(final String name, final byte[] key) throws IOException, RowSpaceExceededException {
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final Index table = getRelation(name);
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if (table == null) return null;
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final Row.Entry entry = table.remove(key);
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if (entry == null) return null;
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return entry.getColBytes(3, true);
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}
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public static void main(final String args[]) {
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final Relations r = new Relations(new File("/Users/admin/"), true, true);
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try {
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final String table1 = "test1";
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r.declareRelation(table1, 12, 30);
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r.putRelation(table1, "abcdefg", "eineintrag");
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r.putRelation(table1, "abcdefg", "eineintrag");
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} catch (final IOException e) {
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Log.logException(e);
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} catch (RowSpaceExceededException e) {
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Log.logException(e);
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}
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}
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}
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