/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
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; version 2 of the License.
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 com.bigdata.journal;
import java.io.ByteArrayOutputStream;
import java.io.DataInput;
import java.io.DataInputStream;
import java.io.DataOutput;
import java.io.DataOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import com.bigdata.io.ByteBufferInputStream;
import com.bigdata.io.LongPacker;
import com.bigdata.util.Bytes;
/**
* A helper class for (de-)serializing the root addresses.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*
* @todo we could use run length encoding to write only the used roots.
*/
public class CommitRecordSerializer {
public static final int VERSION0 = 0x0;
public static final transient CommitRecordSerializer INSTANCE = new CommitRecordSerializer();
public byte[] serialize(ICommitRecord commitRecord) {
final long timestamp = commitRecord.getTimestamp();
final long commitCounter = commitRecord.getCommitCounter();
final int n = commitRecord.getRootAddrCount();
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream(
n * Bytes.SIZEOF_LONG);
DataOutputStream dos = new DataOutputStream(baos);
dos.writeInt(VERSION0);
dos.writeLong(timestamp);
dos.writeLong(commitCounter);
LongPacker.packLong((DataOutput)dos, n);
for(int i=0; i<n; i++) {
dos.writeLong(commitRecord.getRootAddr(i));
// LongPacker.packLong(dos, commitRecord.getRootAddr(i));
}
return baos.toByteArray();
} catch (IOException ex) {
throw new RuntimeException(ex);
}
}
public ICommitRecord deserialize(final ByteBuffer buf) {
try {
final ByteBufferInputStream bbis = new ByteBufferInputStream(buf);
final DataInputStream dis = new DataInputStream(bbis);
final int version = dis.readInt();
if (version != VERSION0)
throw new RuntimeException("Unknown version: " + version);
final long timestamp = dis.readLong();
final long commitCounter = dis.readLong();
final int n = (int)LongPacker.unpackLong((DataInput)dis);
final long[] roots = new long[n];
for (int i = 0; i < n; i++) {
roots[i] = dis.readLong();
// roots[i] = LongPacker.unpackLong(dis);
}
return new CommitRecord(timestamp,commitCounter,roots);
} catch (IOException ex) {
throw new RuntimeException(ex);
}
}
}