/***********************************************************************
* Copyright (c) 2000-2006 The Apache Software Foundation. *
* All rights reserved. *
* ------------------------------------------------------------------- *
* Licensed under the Apache License, Version 2.0 (the "License"); you *
* may not use this file except in compliance with the License. You *
* may obtain a copy of the License at: *
* *
* http://www.apache.org/licenses/LICENSE-2.0 *
* *
* Unless required by applicable law or agreed to in writing, software *
* distributed under the License is distributed on an "AS IS" BASIS, *
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or *
* implied. See the License for the specific language governing *
* permissions and limitations under the License. *
***********************************************************************/
package org.apache.james.mailrepository.filepair;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import org.apache.avalon.cornerstone.services.store.ObjectRepository;
import org.apache.james.util.io.ClassLoaderObjectInputStream;
/**
* This is a simple implementation of persistent object store using
* object serialization on the file system.
*
*/
public class File_Persistent_Object_Repository
extends AbstractFileRepository
implements ObjectRepository
{
protected String getExtensionDecorator()
{
return ".FileObjectStore";
}
/**
* Get the object associated to the given unique key.
*/
public synchronized Object get( final String key )
{
try
{
final InputStream inputStream = getInputStream( key );
if( inputStream == null )
throw new NullPointerException("Null input stream returned for key: " + key );
try
{
final ObjectInputStream stream = new ObjectInputStream( inputStream );
if( stream == null )
throw new NullPointerException("Null stream returned for key: " + key );
final Object object = stream.readObject();
if( DEBUG )
{
getLogger().debug( "returning object " + object + " for key " + key );
}
return object;
}
finally
{
inputStream.close();
}
}
catch( final Throwable e )
{
throw new RuntimeException(
"Exception caught while retrieving an object, cause: " + e.toString() );
}
}
public synchronized Object get( final String key, final ClassLoader classLoader )
{
try
{
final InputStream inputStream = getInputStream( key );
if( inputStream == null )
throw new NullPointerException("Null input stream returned for key: " + key );
try
{
final ObjectInputStream stream = new ClassLoaderObjectInputStream( classLoader, inputStream );
if( stream == null )
throw new NullPointerException("Null stream returned for key: " + key );
final Object object = stream.readObject();
if( DEBUG )
{
getLogger().debug( "returning object " + object + " for key " + key );
}
return object;
}
finally
{
inputStream.close();
}
}
catch( final Throwable e )
{
throw new RuntimeException( "Exception caught while retrieving an object: " + e );
}
}
/**
* Store the given object and associates it to the given key
*/
public synchronized void put( final String key, final Object value )
{
try
{
final OutputStream outputStream = getOutputStream( key );
try
{
final ObjectOutputStream stream = new ObjectOutputStream( outputStream );
stream.writeObject( value );
if( DEBUG ) getLogger().debug( "storing object " + value + " for key " + key );
}
finally
{
outputStream.close();
}
}
catch( final Exception e )
{
throw new RuntimeException( "Exception caught while storing an object: " + e );
}
}
}