/*
* 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;
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.ArrayList;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
/**
* Created by The eXo Platform SAS
*
* Date: 22.07.2008
*
* @author <a href="mailto:peter.nedonosko@exoplatform.com.ua">Peter Nedonosko</a>
* @version $Id: TreeFileIOChannel.java 34801 2009-07-31 15:44:50Z dkatayev $
*/
public class TreeFileIOChannel extends FileIOChannel
{
private static final ConcurrentMap<String, Lock> locks = new ConcurrentHashMap<String, Lock>(64, 0.75f, 64);
TreeFileIOChannel(File rootDir, FileCleaner cleaner, String storageId, ValueDataResourceHolder resources)
{
super(rootDir, cleaner, storageId, resources);
}
@Override
protected String makeFilePath(final String propertyId, final int orderNumber)
{
return buildPath(propertyId) + File.separator + propertyId + orderNumber;
}
@Override
protected File getFile(final String propertyId, final int orderNumber) throws IOException
{
final TreeFile tfile =
new TreeFile(rootDir.getAbsolutePath() + makeFilePath(propertyId, orderNumber), cleaner, rootDir);
mkdirs(tfile.getParentFile()); // make dirs on path
return tfile;
}
@Override
protected File[] getFiles(final String propertyId) throws IOException
{
final File dir = new File(rootDir.getAbsolutePath() + buildPath(propertyId));
String[] fileNames = dir.list();
File[] files = new File[0];
if (fileNames != null)
{
files = new File[fileNames.length];
for (int i = 0; i < fileNames.length; i++)
{
files[i] = new TreeFile(dir.getAbsolutePath() + File.separator + fileNames[i], cleaner, rootDir);
}
}
return files;
}
protected String buildPath(String fileName)
{
return buildPathX8(fileName);
}
// not useful, as it slow in read/write
protected String buildPathX(String fileName)
{
char[] chs = fileName.toCharArray();
StringBuilder path = new StringBuilder();
for (char ch : chs)
{
path.append(File.separator).append(ch);
}
return path.toString();
}
// best for now, 12.07.07
protected String buildPathX8(String fileName)
{
final int xLength = 8;
char[] chs = fileName.toCharArray();
StringBuilder path = new StringBuilder();
for (int i = 0; i < xLength; i++)
{
path.append(File.separator).append(chs[i]);
}
path.append(fileName.substring(xLength));
return path.toString();
}
protected String buildPathXX2X4(String fileName)
{
final int xxLength = 4;
final int xLength = 8;
boolean xxBlock = true;
char[] chs = fileName.toCharArray();
StringBuilder path = new StringBuilder();
for (int xxi = 0; xxi < xxLength; xxi++)
{
char ch = chs[xxi];
path.append(xxBlock ? File.separator + ch : ch);
xxBlock = !xxBlock;
}
for (int xi = xxLength; xi < xLength; xi++)
{
path.append(File.separator).append(chs[xi]);
}
path.append(fileName.substring(xLength));
return path.toString();
}
protected String buildPathXX(String fileName)
{
char[] chs = fileName.toCharArray();
StringBuilder path = new StringBuilder();
boolean block = true;
for (char ch : chs)
{
path.append(block ? File.separator + ch : ch);
block = !block;
}
return path.toString();
}
protected String buildPathXX8(String fileName)
{
final int xxLength = 16; // length / 2 = xx length
char[] chs = fileName.toCharArray();
StringBuilder path = new StringBuilder();
boolean block = true;
for (int i = 0; i < xxLength; i++)
{
char ch = chs[i];
path.append(block ? File.separator + ch : ch);
block = !block;
}
path.append(fileName.substring(xxLength));
return path.toString();
}
private static void mkdirs(File dir)
{
if (dir.exists())
{
return;
}
List<File> dir2Create = new ArrayList<File>();
dir2Create.add(dir);
dir = dir.getParentFile();
while (dir != null && !dir.exists())
{
dir2Create.add(0, dir);
dir = dir.getParentFile();
}
for (int i = 0, length = dir2Create.size(); i < length; i++)
{
mkdir(dir2Create.get(i));
}
}
private static void mkdir(File dir)
{
String path = dir.getAbsolutePath();
Lock lock = locks.get(path);
if (lock == null)
{
lock = new ReentrantLock();
Lock prevLock = locks.putIfAbsent(path, lock);
if (prevLock != null)
{
lock = prevLock;
}
}
lock.lock();
try
{
if (!dir.exists())
{
dir.mkdir();
}
}
finally
{
lock.unlock();
locks.remove(path, lock);
}
}
}