/*
* 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 com.arjuna.ats.arjuna.common.Environment;
import com.arjuna.ats.arjuna.common.arjPropertyManager;
import com.arjuna.ats.arjuna.utils.Utility;
import java.net.*;
import com.arjuna.ats.arjuna.exceptions.FatalError;
import java.io.IOException;
/**
* Obtains a unique value to represent the process id via sockets and
* ports.
*
* @author Mark Little (mark_little@hp.com)
* @version $Id: SocketProcessId.java 2342 2006-03-30 13:06:17Z $
* @since HPTS 3.0.
*/
public class SocketProcessId implements com.arjuna.ats.arjuna.utils.Process
{
/**
* @message com.arjuna.ats.internal.arjuna.utils.SocketProcessId_2 [com.arjuna.ats.internal.arjuna.utils.SocketProcessId_2] - SocketProcessId.getpid could not get unique port.
*/
public SocketProcessId()
{
Integer port = Utility.lookupBoundedIntegerProperty(arjPropertyManager.propertyManager, Environment.SOCKET_PROCESS_ID_PORT, _defaultPort,
"com.arjuna.ats.internal.arjuna.utils.SocketProcessId_1",
0, Utility.MAX_PORT);
Integer maxPorts = Utility.lookupBoundedIntegerProperty(arjPropertyManager.propertyManager, Environment.SOCKET_PROCESS_ID_MAX_PORTS, 1,
"com.arjuna.ats.internal.arjuna.utils.SocketProcessId_3",
0, Utility.MAX_PORT);
int maxPort;
if (maxPorts <= 1)
{
maxPort = port;
}
else if (Utility.MAX_PORT - maxPorts < port)
{
maxPort = Utility.MAX_PORT;
}
else
{
maxPort = port + maxPorts;
}
do {
_theSocket = createSocket(port);
} while (_theSocket == null && ++port < maxPort);
_thePort = ((_theSocket == null) ? -1 : _theSocket.getLocalPort());
if (_thePort == -1) {
throw new FatalError(tsLogger.log_mesg.getString("com.arjuna.ats.internal.arjuna.utils.SocketProcessId_2"));
}
}
/**
* @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 _thePort;
}
private static ServerSocket createSocket(int port)
{
try
{
return new ServerSocket(port, 0, InetAddress.getByName(null));
}
catch (IOException e)
{
return null;
}
}
private final int _thePort;
private ServerSocket _theSocket;
/**
* Default port is any free port.
*/
private static final int _defaultPort = 0 ;
}