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/*******************************************************************************
* Copyright (c) 2004, 2006 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.core.runtime.internal.adaptor;
import java.io.*;
import java.nio.channels.FileLock;
import org.eclipse.osgi.util.NLS;
/**
* Internal class.
*/
public class Locker_JavaNio implements Locker {
private File lockFile;
private FileLock fileLock;
private RandomAccessFile raFile;
public Locker_JavaNio(File lockFile) {
this.lockFile = lockFile;
}
public synchronized boolean lock() throws IOException {
raFile = new RandomAccessFile(lockFile, "rw"); //$NON-NLS-1$
try {
fileLock = raFile.getChannel().tryLock();
} catch (IOException ioe) {
// print exception if debugging
if (BasicLocation.DEBUG)
System.out.println(NLS.bind(EclipseAdaptorMsg.location_cannotLock, lockFile));
// produce a more specific message for clients
String specificMessage = NLS.bind(EclipseAdaptorMsg.location_cannotLockNIO, new Object[] {lockFile, ioe.getMessage(), "\"-D" + BasicLocation.PROP_OSGI_LOCKING + "=none\""}); //$NON-NLS-1$ //$NON-NLS-2$
throw new IOException(specificMessage);
}
if (fileLock != null)
return true;
raFile.close();
raFile = null;
return false;
}
public synchronized void release() {
if (fileLock != null) {
try {
fileLock.release();
} catch (IOException e) {
//don't complain, we're making a best effort to clean up
}
fileLock = null;
}
if (raFile != null) {
try {
raFile.close();
} catch (IOException e) {
//don't complain, we're making a best effort to clean up
}
raFile = null;
}
}
}
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