/*
* JBoss, Home of Professional Open Source
* Copyright 2006, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License, v. 2.1.
* This program is distributed in the hope that it will be useful, but WITHOUT A
* 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,
* v.2.1 along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
* (C) 2005-2006,
* @author JBoss Inc.
*/
/*
* Copyright (C) 2001,
*
* Hewlett-Packard Arjuna Labs,
* Newcastle upon Tyne,
* Tyne and Wear,
* UK.
*
* $Id: SocketProcessId.java 2342 2006-03-30 13:06:17Z $
*/
package com.arjuna.ats.internal.arjuna.utils;
import java.util.UUID;
/**
* Obtains a unique value to represent the process id via UUID.
*/
public class UuidProcessId implements com.arjuna.ats.arjuna.utils.Process
{
public UuidProcessId ()
{
/*
* UUID contains 2*64 bit fields, which we need to convert to a 32 bit number.
* We will lose accuracy and increase the probability of a process id clash.
*/
synchronized (UuidProcessId._theUid)
{
if (_pid == -1)
{
_pid = (int) (_theUid.getLeastSignificantBits() ^ _theUid.getMostSignificantBits());
}
}
}
/**
* @return the process id. This had better be unique between processes on
* the same machine. If not we're in trouble!
*/
public int getpid ()
{
return _pid;
}
private static UUID _theUid = UUID.randomUUID();
private int _pid = -1;
}