/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.server.cache;
import java.io.IOException;
import java.io.OutputStream;
import java.util.logging.Logger;
import com.caucho.config.ConfigException;
import com.caucho.db.Database;
import com.caucho.db.block.BlockStore;
import com.caucho.server.resin.Resin;
import com.caucho.util.L10N;
import com.caucho.vfs.Path;
import com.caucho.vfs.ReadStream;
import com.caucho.vfs.TempStreamApi;
import com.caucho.vfs.Vfs;
/**
* Represents an inode to a temporary file.
*/
public class TempFileManager
{
private static final L10N L = new L10N(TempFileManager.class);
private static final Logger log
= Logger.getLogger(TempFileManager.class.getName());
private final BlockStore _store;
public TempFileManager(Path path)
{
try {
path.getParent().mkdirs();
String name = "temp_file";
Path storePath = path.lookup(name);
storePath.remove();
if (storePath.exists()) {
log.warning(L.l("Removal of old temp file '{0}' failed. Please check permissions.",
storePath.getNativePath()));
}
Database database = new Database();
database.ensureMemoryCapacity(1024 * 1024);
database.init();
_store = new BlockStore(database, name, null, storePath);
_store.setFlushDirtyBlocksOnCommit(false);
_store.create();
} catch (Exception e) {
throw ConfigException.create(e);
}
}
public TempFileInode createInode()
{
return new TempFileInode(_store);
}
public TempStreamApi createTempStream()
{
TempFileInode inode = createInode();
return new TempStreamImpl(inode);
}
class TempStreamImpl implements TempStreamApi {
private TempFileInode _inode;
private OutputStream _os;
TempStreamImpl(TempFileInode inode)
{
_inode = inode;
_os = inode.openOutputStream();
}
@Override
public ReadStream openRead() throws IOException
{
OutputStream os = _os;
if (os != null)
os.close();
return Vfs.openRead(_inode.openInputStream());
}
@Override
public void write(byte[] buffer, int offset, int length, boolean isEnd)
throws IOException
{
_os.write(buffer, offset, length);
}
@Override
public void destroy()
{
TempFileInode inode = _inode;
_inode = null;
if (inode != null)
inode.free();
}
}
}