/*
* 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.exceptions.FatalError;
/**
* Obtains a unique value to represent the process id via configuration.
*
* Other options include ...
*
* int pid = Integer.parseInt((new File("/proc/self")).getCanonicalFile().getName()); // linux specific
*
* Un*x specific ...
*
* String[] cmd = {"/bin/sh", "-c", "echo $PPID"};
* Process proc = Runtime.getRuntime().exec(cmd);
*
* Field field = proc.getClass().getDeclaredField("pid");
* field.setAccessible(true);
*
* _pid = field.getInt(proc); // although this is the child pid!
*
* proc.destroy();
*
* byte[] ba = new byte[100];
* String[] cmd = {"/bin/sh", "-c", "echo $PPID"};
* Process proc = Runtime.getRuntime().exec(cmd);
* proc.getInputStream().read(ba);
* System.out.println(new String(ba));
*
* http://java.sun.com/javase/6/docs/jdk/api/attach/spec/com/sun/tools/attach/VirtualMachine.html // JDK 6 only
*
* and ...
*
* MonitoredHost host = MonitoredHost.getMonitoredHost(null);
*
* for (Object activeVmPid : host.activeVms())
* int pid = (Integer) activeVmPid;
*
* and ...
*
* Process proc = Runtime.getRuntime().exec(cmd);
*
* Field field = proc.getClass().getDeclaredField("pid");
* field.setAccessible(true);
*
* _pid = field.getInt(proc); // although this is the child pid!
*/
public class ManualProcessId 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.ManualProcessId_1
* [com.arjuna.ats.internal.arjuna.utils.ManualProcessId_1]-
* Could not get back a valid pid.
* @message com.arjuna.ats.internal.arjuna.utils.ManualProcessId_2
* [com.arjuna.ats.internal.arjuna.utils.ManualProcessId_2] -
* No process identifier specified in configuration!
* @message com.arjuna.ats.internal.arjuna.utils.ManualProcessId_3
* [com.arjuna.ats.internal.arjuna.utils.ManualProcessId_3] -
* Invalid process identifier specified:
*/
public int getpid ()
{
synchronized (ManualProcessId._lock)
{
if (_pid == -1)
{
String pid = arjPropertyManager.getPropertyManager().getProperty(Environment.PROCESS_IDENTIFIER);
if (pid == null)
throw new FatalError(tsLogger.log_mesg.getString("com.arjuna.ats.internal.arjuna.utils.ManualProcessId_1"));
try
{
_pid = Integer.parseInt(pid);
}
catch (final Exception ex)
{
throw new FatalError(tsLogger.log_mesg.getString("com.arjuna.ats.internal.arjuna.utils.ManualProcessId_3")+" "+pid);
}
}
}
if (_pid == -1)
throw new FatalError(tsLogger.log_mesg.getString("com.arjuna.ats.internal.arjuna.utils.ManualProcessId_1"));
return _pid;
}
private static final Object _lock = new Object();
private int _pid = -1;
}