/*
* 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: FileProcessId.java 2342 2006-03-30 13:06:17Z $
*/
package com.arjuna.ats.internal.arjuna.utils;
import com.arjuna.ats.arjuna.common.Environment;
import com.arjuna.ats.arjuna.common.arjPropertyManager;
import com.arjuna.common.util.propertyservice.PropertyManager;
import com.arjuna.ats.arjuna.utils.Process;
import com.arjuna.ats.arjuna.utils.Utility;
import java.io.*;
import java.net.InetAddress;
import com.arjuna.ats.arjuna.exceptions.FatalError;
import java.net.UnknownHostException;
import java.lang.NumberFormatException;
import java.lang.StringIndexOutOfBoundsException;
import java.io.IOException;
import java.io.FileNotFoundException;
import com.arjuna.ats.arjuna.logging.tsLogger;
/**
* Obtains a unique value to represent the process id via the filesystem.
*
* @author Mark Little (mark@arjuna.com)
* @version $Id: FileProcessId.java 2342 2006-03-30 13:06:17Z $
* @since JTS 1.0.
*/
public class FileProcessId 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!
*
* @since JTS 2.1.
*
* @message com.arjuna.ats.internal.arjuna.utils.FileProcessId_1 [com.arjuna.ats.internal.arjuna.utils.FileProcessId_1] - FileProcessId.getpid - could not locate temporary directory.
* @message com.arjuna.ats.internal.arjuna.utils.FileProcessId_2 [com.arjuna.ats.internal.arjuna.utils.FileProcessId_2] - FileProcessId.getpid could not create unique file.
*/
public int getpid ()
{
if (FileProcessId.processId == 0)
{
synchronized (FileProcessId.hexStart)
{
/*
* All of this is just to ensure uniqueness!
*/
if (FileProcessId.processId == 0)
{
int retry = 1000;
int pid = (int) System.currentTimeMillis();
pid = Math.abs(pid);
/*
* Use the "var" directory location from the property file.
* If it is not set, create "./var/tmp".
*/
String dir = arjPropertyManager.propertyManager.getProperty(Environment.VAR_DIR);
if (dir == null || dir.length() == 0)
dir = System.getProperty("user.dir") + File.separator + "var" + File.separator + "tmp";
else
dir = dir + File.separator + "tmp";
File tmpDir = new File(dir);
if (tmpDir.isDirectory() == false && tmpDir.mkdirs() == false)
throw new FatalError(tsLogger.log_mesg.getString("com.arjuna.ats.internal.arjuna.utils.FilePocessId_1"));
for (int i = 0; i < retry; i++)
{
try
{
File f = new File(dir + File.separator+ "pid " + pid);
if (f.createNewFile())
{
f.deleteOnExit(); // problem if we crash?
processId = pid;
break;
}
else
pid++;
}
catch (IOException e)
{
}
}
if (processId == 0)
throw new FatalError(tsLogger.log_mesg.getString("com.arjuna.ats.internal.arjuna.utils.FilePocessId_2"));
}
}
}
return processId;
}
private static int processId = 0;
private static final String hexStart = "0x";
}