/*
* Copyright (C) 2009 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY 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 along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.services.jcr.impl.storage.value.fs.operations;
import org.exoplatform.services.jcr.impl.storage.value.ValueDataResourceHolder;
import org.exoplatform.services.jcr.impl.util.io.FileCleaner;
import java.io.File;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicLong;
/**
* Created by The eXo Platform SAS.
*
* <br>
* Date: 03.04.2009
*
* @author <a href="mailto:peter.nedonosko@exoplatform.com.ua">Peter Nedonosko</a>
* @version $Id: DeleteValues.java 111 2008-11-11 11:11:11Z pnedonosko $
*/
public class DeleteValues extends ValueFileOperation
{
private static final AtomicLong SEQUENCE = new AtomicLong();
/**
* Files to be deleted.
*/
private final File[] files;
/**
* Locks on files.
*/
private ValueFileLock[] locks;
/**
* The backup files
*/
protected File[] bckFiles;
/**
* DeleteValues constructor.
*
* @param files
* Files to be deleted
* @param resources
* ValueDataResourceHolder
* @param cleaner
* FileCleaner
*/
public DeleteValues(File[] files, ValueDataResourceHolder resources, FileCleaner cleaner, File tempDir)
{
super(resources, cleaner, tempDir);
this.files = files;
}
/**
* {@inheritDoc}
*/
public void execute() throws IOException
{
makePerformed();
locks = new ValueFileLock[files.length];
for (int i = 0; i < files.length; i++)
{
ValueFileLock fl = new ValueFileLock(files[i]);
fl.lock();
locks[i] = fl;
}
}
/**
* {@inheritDoc}
*/
public void prepare() throws IOException
{
if (locks != null)
{
bckFiles = new File[files.length];
for (int i = 0,length = files.length; i < length; i++)
{
File file = files[i];
if (file.exists())
{
bckFiles[i] =
new File(file.getAbsolutePath() + "." + System.currentTimeMillis() + "_" + SEQUENCE.incrementAndGet());
move(file, bckFiles[i]);
}
}
}
}
/**
* {@inheritDoc}
*/
public void rollback() throws IOException
{
if (locks != null)
try
{
if (bckFiles == null)
return;
for (int i = 0,length = bckFiles.length; i < length; i++)
{
File f = bckFiles[i];
if (f != null)
{
// As the files could be registered to the file cleaner
// to be removed in case of a move that failed
// or in case of a WriteValue.rollback() that could not
// remove the file, we need to unregister the files that
// will be restored thanks to the backup file
cleaner.removeFile(files[i]);
move(f, files[i]);
}
}
}
finally
{
for (int i = 0,length = locks.length; i < length; i++)
{
ValueFileLock fl = locks[i];
fl.unlock();
}
}
}
/**
* {@inheritDoc}
*/
public void twoPhaseCommit() throws IOException
{
if (locks != null)
try
{
if (bckFiles == null)
return;
for (int i = 0,length = bckFiles.length; i < length; i++)
{
File f = bckFiles[i];
if (f != null && !f.delete())
// Possible place of error: FileNotFoundException when we delete/update existing
// Value and then add/update again.
// After the time the Cleaner will delete the file which is mapped to the Value.
// Don't use cleaner! Care about transaction-style files isolation per-user etc.
cleaner.addFile(f);
}
}
finally
{
for (int i = 0,length = locks.length; i < length; i++)
{
ValueFileLock fl = locks[i];
fl.unlock();
}
}
}
}