/*
* Eoulsan development code
*
* This code may be freely distributed and modified under the
* terms of the GNU Lesser General Public License version 2.1 or
* later and CeCILL-C. This should be distributed with the code.
* If you do not have a copy, see:
*
* http://www.gnu.org/licenses/lgpl-2.1.txt
* http://www.cecill.info/licences/Licence_CeCILL-C_V1-en.txt
*
* Copyright for this code is held jointly by the Genomic platform
* of the Institut de Biologie de l'École normale supérieure and
* the individual authors. These should be listed in @author doc
* comments.
*
* For more information on the Eoulsan project and its aims,
* or to join the Eoulsan Google group, visit the home page
* at:
*
* http://outils.genomique.biologie.ens.fr/eoulsan
*
*/
package fr.ens.biologie.genomique.eoulsan.util.locker;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;
/**
* This class define a lock file.
* @since 1.1
* @author Laurent Jourdren
*/
public class ExecFileLock implements Locker {
private final File lockFile;
private FileLock lock;
private FileChannel lockChannel;
private boolean released;
@Override
public void lock() throws IOException {
this.lockChannel = new RandomAccessFile(this.lockFile, "rw").getChannel();
this.lock = this.lockChannel.lock();
// lockFile.deleteOnExit();
}
@Override
public void unlock() throws IOException {
if (this.released) {
return;
}
if (this.lock.isValid()) {
this.lock.release();
this.released = true;
if (this.lockChannel.isOpen()) {
this.lockChannel.close();
}
}
// lockFile.delete();
}
//
// Constructor
//
/**
* Public constructor.
* @param lockFile lock file to use
*/
public ExecFileLock(final File lockFile) {
this.lockFile = lockFile;
}
}