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/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.debug.internal.core;
/**
* Monitors a system process, wiating for it to terminate, and
* then notifies the associated runtime process.
*/
public class ProcessMonitor {
/**
* The underlying <code>java.lang.Process</code> being monitored.
*/
protected Process fOSProcess;
/**
* The <code>IProcess</code> which will be informed when this
* monitor detects that the underlying process has terminated.
*/
protected RuntimeProcess fProcess;
/**
* The <code>Thread</code> which is monitoring the underlying process.
*/
protected Thread fThread;
/**
* Creates a new process monitor and starts monitoring the process
* for termination.
*/
public ProcessMonitor(RuntimeProcess process) {
fProcess= process;
fOSProcess= process.getSystemProcess();
startMonitoring();
}
/**
* Monitors the underlying process for termination. When the underlying
* process terminates (or if the monitoring thread is interrupted),
* inform the <code>IProcess</code> that it has terminated.
*/
private void monitorProcess() {
while (fOSProcess != null) {
try {
fOSProcess.waitFor();
} catch (InterruptedException ie) {
} finally {
fOSProcess = null;
fProcess.terminated();
}
}
}
/**
* Starts monitoring the underlying process to determine
* if it has terminated.
*/
private void startMonitoring() {
if (fThread == null) {
fThread= new Thread(new Runnable() {
public void run() {
monitorProcess();
}
}, DebugCoreMessages.getString("ProcessMonitor.label")); //$NON-NLS-1$
fThread.start();
}
}
/**
* Kills the monitoring thread.
*
* This method is to be useful for dealing with the error
* case of an underlying process which has not informed this
* monitor of its termination.
*/
protected void killMonitoring() {
fThread.interrupt();
}
}
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