package org.apache.ojb.otm.transaction;
/* Copyright 2003-2005 The Apache Software Foundation
*
* 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.
*/
import org.apache.ojb.broker.PBKey;
import org.apache.ojb.otm.OTMConnection;
import org.apache.ojb.otm.core.BaseConnection;
import org.apache.ojb.otm.core.Transaction;
import org.apache.ojb.otm.core.TransactionException;
import java.util.HashMap;
/**
*
* Factory for local transactions. Each OTMConnection is associated with exactly one transaction.
*
* @author <a href="mailto:rraghuram@hotmail.com">Raghu Rajah</a>
*
*/
public class LocalTransactionFactory implements TransactionFactory
{
private HashMap _transactionMap;
public LocalTransactionFactory ()
{
_transactionMap = new HashMap();
}
/**
* @see org.apache.ojb.otm.transaction.TransactionFactory#getTransactionForConnection(OTMConnection)
*/
public Transaction getTransactionForConnection (OTMConnection connection)
{
if (!(connection instanceof BaseConnection))
{
StringBuffer msg = new StringBuffer();
msg.append("Unknown connection type: ");
if (connection != null)
msg.append(connection.getClass().getName());
else
msg.append(" null. Make sure you pass a non-null OTMConnection to this method. An OTMConnection can be acquired by calling acquireConnection (PBKey pbKey)");
throw new TransactionFactoryException(msg.toString());
}
Transaction tx = (Transaction) _transactionMap.get(connection);
if (tx == null)
{
tx = new Transaction();
_transactionMap.put(connection, tx);
}
// ensure that this connection is registered into this transaction
tx.registerConnection(connection);
return tx;
}
/**
* @see org.apache.ojb.otm.transaction.TransactionFactory#acquireConnection(PBKey)
*/
public OTMConnection acquireConnection (PBKey pbKey)
{
OTMConnection newConnection = new LocalConnection(pbKey);
// Ensure the transaction is established for this connection.
getTransactionForConnection(newConnection);
return newConnection;
}
/**
*
* Represents a local connection. This is a private static inner class to restrict visibility
* to others.
*
* @author <a href="mailto:rraghuram@hotmail.com">Raghu Rajah</a>
*
*/
private static class LocalConnection extends BaseConnection
{
public LocalConnection (PBKey pbKey)
{
super(pbKey);
}
/**
* @see org.apache.ojb.otm.core.BaseConnection#transactionBegin()
*/
public void transactionBegin() throws TransactionException
{
getKernelBroker().beginTransaction();
}
/**
* @see org.apache.ojb.otm.core.BaseConnection#transactionPrepare()
*/
public void transactionPrepare() throws TransactionException
{
// Nothing to do!
}
/**
* @see org.apache.ojb.otm.core.BaseConnection#transactionCommit()
*/
public void transactionCommit() throws TransactionException
{
getKernelBroker().commitTransaction();
}
/**
* @see org.apache.ojb.otm.core.BaseConnection#transactionRollback()
*/
public void transactionRollback() throws TransactionException
{
getKernelBroker().abortTransaction();
}
}
}