You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
200 lines
8.1 KiB
200 lines
8.1 KiB
// kelondroRelations.java
|
|
// (C) 2008 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
|
|
// first published 3.07.2008 on http://yacy.net
|
|
//
|
|
// This is a part of YaCy, a peer-to-peer based web search engine
|
|
//
|
|
// $LastChangedDate: 2008-03-14 01:16:04 +0100 (Fr, 14 Mrz 2008) $
|
|
// $LastChangedRevision: 4558 $
|
|
// $LastChangedBy: orbiter $
|
|
//
|
|
// LICENSE
|
|
//
|
|
// This program is free software; you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation; either version 2 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program; if not, write to the Free Software
|
|
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
package net.yacy.kelondro.table;
|
|
|
|
import java.io.File;
|
|
import java.io.IOException;
|
|
import java.util.HashMap;
|
|
|
|
import net.yacy.kelondro.index.ObjectIndex;
|
|
import net.yacy.kelondro.index.Row;
|
|
import net.yacy.kelondro.index.RowSpaceExceededException;
|
|
import net.yacy.kelondro.logging.Log;
|
|
import net.yacy.kelondro.order.NaturalOrder;
|
|
|
|
|
|
public class Relations {
|
|
|
|
private final File baseDir;
|
|
private HashMap<String, ObjectIndex> relations;
|
|
private final boolean useTailCache;
|
|
private final boolean exceed134217727;
|
|
|
|
public Relations(
|
|
final File location,
|
|
final boolean useTailCache,
|
|
final boolean exceed134217727) {
|
|
this.baseDir = location;
|
|
this.useTailCache = useTailCache;
|
|
this.exceed134217727 = exceed134217727;
|
|
}
|
|
|
|
private static Row rowdef(String filename) {
|
|
int p = filename.lastIndexOf('.');
|
|
if (p >= 0) filename = filename.substring(0, p);
|
|
p = filename.lastIndexOf('-');
|
|
assert p >= 0;
|
|
final int payloadsize = Integer.parseInt(filename.substring(p + 1));
|
|
filename = filename.substring(0, p);
|
|
p = filename.lastIndexOf('-');
|
|
assert p >= 0;
|
|
final int keysize = Integer.parseInt(filename.substring(p + 1));
|
|
return rowdef(keysize, payloadsize);
|
|
}
|
|
|
|
private static Row rowdef(final int keysize, final int payloadsize) {
|
|
return new Row(
|
|
"byte[] key-" + keysize + ", " +
|
|
"long time-8" + keysize + ", " +
|
|
"int ttl-4" + keysize + ", " +
|
|
"byte[] node-" + payloadsize,
|
|
NaturalOrder.naturalOrder);
|
|
}
|
|
|
|
private static String filename(final String tablename, final int keysize, final int payloadsize) {
|
|
return tablename + "-" + keysize + "-" + payloadsize + ".eco";
|
|
}
|
|
|
|
public void declareRelation(final String name, final int keysize, final int payloadsize) throws RowSpaceExceededException {
|
|
// try to get the relation from the relation-cache
|
|
final ObjectIndex relation = relations.get(name);
|
|
if (relation != null) return;
|
|
// try to find the relation as stored on file
|
|
final String[] list = baseDir.list();
|
|
final String targetfilename = filename(name, keysize, payloadsize);
|
|
for (int i = 0; i < list.length; i++) {
|
|
if (list[i].startsWith(name)) {
|
|
if (!list[i].equals(targetfilename)) continue;
|
|
final Row row = rowdef(list[i]);
|
|
if (row.primaryKeyLength != keysize || row.column(1).cellwidth != payloadsize) continue; // a wrong table
|
|
ObjectIndex table;
|
|
try {
|
|
table = new Table(new File(baseDir, list[i]), row, 1024*1024, 0, this.useTailCache, this.exceed134217727);
|
|
} catch (RowSpaceExceededException e) {
|
|
table = new Table(new File(baseDir, list[i]), row, 0, 0, false, this.exceed134217727);
|
|
}
|
|
relations.put(name, table);
|
|
return;
|
|
}
|
|
}
|
|
// the relation does not exist, create it
|
|
final Row row = rowdef(keysize, payloadsize);
|
|
ObjectIndex table;
|
|
try {
|
|
table = new Table(new File(baseDir, targetfilename), row, 1024*1024, 0, this.useTailCache, this.exceed134217727);
|
|
} catch (RowSpaceExceededException e) {
|
|
table = new Table(new File(baseDir, targetfilename), row, 0, 0, false, this.exceed134217727);
|
|
}
|
|
relations.put(name, table);
|
|
}
|
|
|
|
public ObjectIndex getRelation(final String name) throws RowSpaceExceededException {
|
|
// try to get the relation from the relation-cache
|
|
final ObjectIndex relation = relations.get(name);
|
|
if (relation != null) return relation;
|
|
// try to find the relation as stored on file
|
|
final String[] list = baseDir.list();
|
|
for (int i = 0; i < list.length; i++) {
|
|
if (list[i].startsWith(name)) {
|
|
final Row row = rowdef(list[i]);
|
|
ObjectIndex table;
|
|
try {
|
|
table = new Table(new File(baseDir, list[i]), row, 1024*1024, 0, this.useTailCache, this.exceed134217727);
|
|
} catch (RowSpaceExceededException e) {
|
|
table = new Table(new File(baseDir, list[i]), row, 0, 0, false, this.exceed134217727);
|
|
}
|
|
relations.put(name, table);
|
|
return table;
|
|
}
|
|
}
|
|
// the relation does not exist
|
|
return null;
|
|
}
|
|
|
|
public String putRelation(final String name, final String key, final String value) throws IOException, RowSpaceExceededException {
|
|
final byte[] r = putRelation(name, key.getBytes(), value.getBytes());
|
|
if (r == null) return null;
|
|
return new String(r);
|
|
}
|
|
|
|
public byte[] putRelation(final String name, final byte[] key, final byte[] value) throws IOException, RowSpaceExceededException {
|
|
final ObjectIndex table = getRelation(name);
|
|
if (table == null) return null;
|
|
final Row.Entry entry = table.row().newEntry();
|
|
entry.setCol(0, key);
|
|
entry.setCol(1, System.currentTimeMillis());
|
|
entry.setCol(2, 1000000);
|
|
entry.setCol(3, value);
|
|
final Row.Entry oldentry = table.replace(entry);
|
|
if (oldentry == null) return null;
|
|
return oldentry.getColBytes(3, true);
|
|
}
|
|
|
|
public String getRelation(final String name, final String key) throws IOException, RowSpaceExceededException {
|
|
final byte[] r = getRelation(name, key.getBytes());
|
|
if (r == null) return null;
|
|
return new String(r);
|
|
}
|
|
|
|
public byte[] getRelation(final String name, final byte[] key) throws IOException, RowSpaceExceededException {
|
|
final ObjectIndex table = getRelation(name);
|
|
if (table == null) return null;
|
|
final Row.Entry entry = table.get(key);
|
|
if (entry == null) return null;
|
|
return entry.getColBytes(3, true);
|
|
}
|
|
|
|
public boolean hasRelation(final String name, final byte[] key) throws RowSpaceExceededException {
|
|
final ObjectIndex table = getRelation(name);
|
|
if (table == null) return false;
|
|
return table.has(key);
|
|
}
|
|
|
|
public byte[] removeRelation(final String name, final byte[] key) throws IOException, RowSpaceExceededException {
|
|
final ObjectIndex table = getRelation(name);
|
|
if (table == null) return null;
|
|
final Row.Entry entry = table.remove(key);
|
|
if (entry == null) return null;
|
|
return entry.getColBytes(3, true);
|
|
}
|
|
|
|
public static void main(final String args[]) {
|
|
final Relations r = new Relations(new File("/Users/admin/"), true, true);
|
|
try {
|
|
final String table1 = "test1";
|
|
r.declareRelation(table1, 12, 30);
|
|
r.putRelation(table1, "abcdefg", "eineintrag");
|
|
r.putRelation(table1, "abcdefg", "eineintrag");
|
|
} catch (final IOException e) {
|
|
Log.logException(e);
|
|
} catch (RowSpaceExceededException e) {
|
|
Log.logException(e);
|
|
}
|
|
}
|
|
|
|
}
|