/*
 * 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 com.arjuna.ats.arjuna.logging.tsLogger;

import java.lang.management.ManagementFactory;

import com.arjuna.ats.arjuna.exceptions.FatalError;

/**
 * Obtains a unique value to represent the process id via ManagementFactory.getRuntimeMXBean().getName().
 * 
 * WARNING: use with care because the contents of getName may change between OSes and versions of
 * JDK.
 */

public class MBeanProcessId implements com.arjuna.ats.arjuna.utils.Process
{

    /**
     * @return the process id. This had better be unique between processes on
     *         the same machine. If not we're in trouble!
     * @message com.arjuna.ats.internal.arjuna.utils.MBeanProcessId_1
     *          [com.arjuna.ats.internal.arjuna.utils.MBeanProcessId_1]-
     *          Could not get back a valid pid.
     * @message com.arjuna.ats.internal.arjuna.utils.MBeanProcessId_2
     *          [com.arjuna.ats.internal.arjuna.utils.MBeanProcessId_2] -
     *          getName returned unrecognized format:
     */

    public int getpid ()
    {
        synchronized (MBeanProcessId._lock)
        {
            if (_pid == -1)
            {
                String name = ManagementFactory.getRuntimeMXBean().getName(); 
                String[] parsed = name.split("@");
               
                try
                {
                    _pid = Integer.valueOf(parsed[0]);
                }
                catch (final Exception ex)
                {
                    throw new FatalError(tsLogger.log_mesg.getString("com.arjuna.ats.internal.arjuna.utils.MBeanProcessId_2")+" "+name);
                }
            }
        }
        
        if (_pid == -1)
            throw new FatalError(tsLogger.log_mesg.getString("com.arjuna.ats.internal.arjuna.utils.MBeanProcessId_1"));
        
        return _pid;
    }

    private static final Object _lock = new Object();

    private int _pid = -1;
}
