/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.qpid.server.txn;
import org.apache.log4j.Logger;
import org.apache.qpid.AMQException;
import org.apache.qpid.AMQStoreException;
import org.apache.qpid.server.message.EnqueableMessage;
import org.apache.qpid.server.message.ServerMessage;
import org.apache.qpid.server.queue.BaseQueue;
import org.apache.qpid.server.queue.QueueEntry;
import org.apache.qpid.server.store.MessageStore;
import org.apache.qpid.server.store.Transaction;
import java.util.Collection;
import java.util.List;
/**
* An implementation of ServerTransaction where each enqueue/dequeue
* operation takes place within it own transaction.
*
* Since there is no long-lived transaction, the commit and rollback methods of
* this implementation are empty.
*/
public class AutoCommitTransaction implements ServerTransaction
{
protected static final Logger _logger = Logger.getLogger(AutoCommitTransaction.class);
private final MessageStore _messageStore;
public AutoCommitTransaction(MessageStore transactionLog)
{
_messageStore = transactionLog;
}
@Override
public long getTransactionStartTime()
{
return 0L;
}
@Override
public long getTransactionUpdateTime()
{
return 0L;
}
/**
* Since AutoCommitTransaction have no concept of a long lived transaction, any Actions registered
* by the caller are executed immediately.
*/
public void addPostTransactionAction(final Action immediateAction)
{
immediateAction.postCommit();
}
public void dequeue(BaseQueue queue, EnqueableMessage message, Action postTransactionAction)
{
Transaction txn = null;
try
{
if(message.isPersistent() && queue.isDurable())
{
if (_logger.isDebugEnabled())
{
_logger.debug("Dequeue of message number " + message.getMessageNumber() + " from transaction log. Queue : " + queue.getName());
}
txn = _messageStore.newTransaction();
txn.dequeueMessage(queue, message);
txn.commitTran();
txn = null;
}
postTransactionAction.postCommit();
postTransactionAction = null;
}
catch (AMQException e)
{
_logger.error("Error during message dequeue", e);
throw new RuntimeException("Error during message dequeue", e);
}
finally
{
rollbackIfNecessary(postTransactionAction, txn);
}
}
public void dequeue(Collection<QueueEntry> queueEntries, Action postTransactionAction)
{
Transaction txn = null;
try
{
for(QueueEntry entry : queueEntries)
{
ServerMessage message = entry.getMessage();
BaseQueue queue = entry.getQueue();
if(message.isPersistent() && queue.isDurable())
{
if (_logger.isDebugEnabled())
{
_logger.debug("Dequeue of message number " + message.getMessageNumber() + " from transaction log. Queue : " + queue.getName());
}
if(txn == null)
{
txn = _messageStore.newTransaction();
}
txn.dequeueMessage(queue, message);
}
}
if(txn != null)
{
txn.commitTran();
txn = null;
}
postTransactionAction.postCommit();
postTransactionAction = null;
}
catch (AMQException e)
{
_logger.error("Error during message dequeues", e);
throw new RuntimeException("Error during message dequeues", e);
}
finally
{
rollbackIfNecessary(postTransactionAction, txn);
}
}
public void enqueue(BaseQueue queue, EnqueableMessage message, Action postTransactionAction)
{
Transaction txn = null;
try
{
if(message.isPersistent() && queue.isDurable())
{
if (_logger.isDebugEnabled())
{
_logger.debug("Enqueue of message number " + message.getMessageNumber() + " to transaction log. Queue : " + queue.getName());
}
txn = _messageStore.newTransaction();
txn.enqueueMessage(queue, message);
txn.commitTran();
txn = null;
}
postTransactionAction.postCommit();
postTransactionAction = null;
}
catch (AMQException e)
{
_logger.error("Error during message enqueue", e);
throw new RuntimeException("Error during message enqueue", e);
}
finally
{
rollbackIfNecessary(postTransactionAction, txn);
}
}
public void enqueue(List<? extends BaseQueue> queues, EnqueableMessage message, Action postTransactionAction)
{
Transaction txn = null;
try
{
if(message.isPersistent())
{
for(BaseQueue queue : queues)
{
if (queue.isDurable())
{
if (_logger.isDebugEnabled())
{
_logger.debug("Enqueue of message number " + message.getMessageNumber() + " to transaction log. Queue : " + queue.getName());
}
if (txn == null)
{
txn = _messageStore.newTransaction();
}
txn.enqueueMessage(queue, message);
}
}
}
if (txn != null)
{
txn.commitTran();
txn = null;
}
postTransactionAction.postCommit();
postTransactionAction = null;
}
catch (AMQException e)
{
_logger.error("Error during message enqueues", e);
throw new RuntimeException("Error during message enqueues", e);
}
finally
{
rollbackIfNecessary(postTransactionAction, txn);
}
}
public void commit(final Runnable immediatePostTransactionAction)
{
immediatePostTransactionAction.run();
}
public void commit()
{
}
public void rollback()
{
}
public boolean isTransactional()
{
return false;
}
private void rollbackIfNecessary(Action postTransactionAction, Transaction txn)
{
if (txn != null)
{
try
{
txn.abortTran();
}
catch (AMQStoreException e)
{
_logger.error("Abort transaction failed", e);
// Deliberate decision not to re-throw this exception. Rationale: we can only reach here if a previous
// TransactionLog method has ended in Exception. If we were to re-throw here, we would prevent
// our caller from receiving the original exception (which is likely to be more revealing of the underlying error).
}
}
if (postTransactionAction != null)
{
postTransactionAction.onRollback();
}
}
}