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package com.sun.enterprise.util;
import com.sun.logging.LogDomains;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.PrintStream;
import java.util.logging.*;
import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.File;
/**
* This is a generic utility class that uses the native code to fetch
* process id of the current JVM process. One usage of this PId is in
* the --kill CLI option for stop-* commands such as asadmin stop-domain,
* asadmin stop-instance, asadmin stop-node-agent and asadmin stop-cluster.
*
*/
public class JvmInfoUtil {
public native int getPid();
boolean debug = false;
static boolean pidLoggingEnabled = false;
static Logger _logger = LogDomains.getLogger(LogDomains.UTIL_LOGGER);
private static LocalStringManagerImpl localStrings =
new LocalStringManagerImpl(JvmInfoUtil.class);
final static public int getPIDfromFileAndDelete(File pidFile)
{
// In the only current use case, we are getting the pid in order to kill
// the process. In which case this pid file will contain garbage so it
// should be deleted.
int pid = getPIDfromFile(pidFile);
try
{
pidFile.delete();
}
catch(Exception e)
{
// ignore
}
return pid;
}
final static public int getPIDfromFile(File pidFile)
{
BufferedReader reader = null;
int pid = -1;
try {
reader = new BufferedReader(new FileReader(pidFile));
try {
pid = Integer.parseInt(reader.readLine());
}
catch(Exception e) {
pid = -1;
}
} catch (Exception ex) {
pid = -1;
} finally {
try {
if (reader != null) reader.close();
} catch (Exception ex) {
// too bad this stream closure failed... ignore
}
}
return pid;
}
public synchronized void logPID(String pidFileName) {
try {
System.loadLibrary("jvminfoutil");
pidLoggingEnabled = true;
} catch (Throwable t) {
// Log the fact that PID logging remains disabled
// which means --kill commands will not work.
if (debug && !pidLoggingEnabled) {
_logger.log(Level.WARNING, localStrings.getLocalString(
"utility.no.pid.logging", "Process ID of this Java Virtual" +
"Machine will not be logged. Consequently the --kill option " +
"in Asadmin CLI commands such as stop-domain, stop-instance," +
" stop-node-agent and stop-cluster will be disabled."));
}
}
PrintStream ps = null;
File pidFile = new File(pidFileName);
try {
if (debug) System.out.println("PID = " + getPid());
if (debug) System.out.println("PID FILENAME = " + pidFileName);
ps = new PrintStream(pidFile);
if (pidLoggingEnabled)
ps.println("" + getPid());
else ps.println("-1"); //dos.writeInt(-1); // clients of the pid file interprete -1
// as "NO_PROCESS should be killed".
ps.flush();
} catch (Throwable ex) {
// Could not update the pid file with latest info.
// ignore. Because the initiator VMs for stop-xxx commands
// will check for the timestamp of this file and the admsn
} finally {
try {
if (ps != null) ps.close();
} catch (Exception ex) {
//ignore
}
// Bugfix suggested by Abhijit Kumar
// this will guarantee that once this process is dead - there won't
// be a file with the old invalid pid lying around.
pidFile.deleteOnExit();
}
}
public static void main(String[] args) {
int pid = new JvmInfoUtil().getPid();
System.out.println("This JVM Process's Process ID is =" + pid);
}
} |