/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.messaging.core.tx;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.Serializable;
import javax.transaction.xa.Xid;
import org.jboss.messaging.util.Streamable;
/**
*
* Xid implementation
*
* @author <a href="mailto:adrian@jboss.org>Adrian Brock</a>
* @author <a href="mailto:tim.fox@jboss.com">Tim Fox</a>
* @author <a href="mailto:juha@jboss.org">Juha Lindfors</a>
*
* @version $Revision 1.1 $
*/
public class MessagingXid implements Xid, Serializable, Streamable
{
private static final long serialVersionUID = -1893120702576869245L;
private byte[] branchQualifier;
private int formatId;
private byte[] globalTransactionId;
private int hash;
private boolean hashCalculated;
public byte[] getBranchQualifier()
{
return branchQualifier;
}
public int getFormatId()
{
return formatId;
}
public byte[] getGlobalTransactionId()
{
return globalTransactionId;
}
//For serialization
public MessagingXid()
{
}
public MessagingXid(byte[] branchQualifier, int formatId, byte[] globalTransactionId)
{
this.branchQualifier = branchQualifier;
this.formatId = formatId;
this.globalTransactionId = globalTransactionId;
}
//Copy constructor
public MessagingXid(Xid other)
{
this.branchQualifier = copyBytes(other.getBranchQualifier());
this.formatId = other.getFormatId();
this.globalTransactionId = copyBytes(other.getGlobalTransactionId());
}
public int hashCode()
{
if (!hashCalculated)
{
calcHash();
}
return hash;
}
public boolean equals(Object other)
{
if (!(other instanceof Xid))
{
return false;
}
Xid xother = (Xid)other;
if (xother.getFormatId() != formatId)
{
return false;
}
if (xother.getBranchQualifier().length != this.branchQualifier.length)
{
return false;
}
if (xother.getGlobalTransactionId().length != this.globalTransactionId.length)
{
return false;
}
for (int i = 0; i < this.branchQualifier.length; i++)
{
byte[] otherBQ = xother.getBranchQualifier();
if (this.branchQualifier[i] != otherBQ[i])
{
return false;
}
}
for (int i = 0; i < this.globalTransactionId.length; i++)
{
byte[] otherGtx = xother.getGlobalTransactionId();
if (this.globalTransactionId[i] != otherGtx[i])
{
return false;
}
}
return true;
}
public String toString()
{
return getClass().getName() + "(GID: " + stringRep(getGlobalTransactionId()) +
", Branch: " + stringRep(getBranchQualifier()) +
", Format: " + getFormatId() + ")";
}
private String stringRep(byte[] bytes)
{
StringBuffer buff = new StringBuffer();
for (int i = 0; i < bytes.length; i++)
{
byte b = bytes[i];
buff.append(b);
if (i != bytes.length - 1)
{
buff.append('.');
}
}
return buff.toString();
}
public void read(DataInputStream in) throws Exception
{
int len = in.readInt();
branchQualifier = new byte[len];
in.readFully(branchQualifier);
formatId = in.readInt();
len = in.readInt();
globalTransactionId = new byte[len];
in.readFully(globalTransactionId);
}
public void write(DataOutputStream out) throws Exception
{
out.writeInt(branchQualifier.length);
out.write(branchQualifier);
out.writeInt(formatId);
out.writeInt(globalTransactionId.length);
out.write(globalTransactionId);
}
private void calcHash()
{
byte[] hashBytes = new byte[branchQualifier.length + globalTransactionId.length + 4];
System.arraycopy(branchQualifier, 0, hashBytes, 0, branchQualifier.length);
System.arraycopy(globalTransactionId, 0, hashBytes, branchQualifier.length, globalTransactionId.length);
byte[] intBytes = new byte[4];
for (int i = 0; i < 4; i++)
{
intBytes[i] = (byte)((formatId >> (i * 8)) % 0xFF);
}
System.arraycopy(intBytes, 0, hashBytes, branchQualifier.length + globalTransactionId.length, 4);
String s = new String(hashBytes);
hash = s.hashCode();
hashCalculated = true;
}
private byte[] copyBytes(byte[] other)
{
byte[] bytes = new byte[other.length];
System.arraycopy(other, 0, bytes, 0, other.length);
return bytes;
}
}