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package org.apache.qpid.server.txn;
/*
*
* 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.
*
*/
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.apache.qpid.AMQException;
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.TransactionLog;
import org.apache.qpid.server.queue.AMQQueue;
import org.apache.qpid.server.queue.BaseQueue;
import org.apache.qpid.server.queue.QueueEntry;
import org.apache.qpid.server.store.TransactionLog;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A concrete implementation of ServerTransaction where enqueue/dequeue
* operations share a single long-lived transaction.
*
* The caller is responsible for invoking commit() (or rollback()) as necessary.
*/
public class LocalTransaction implements ServerTransaction
{
protected static final Logger _logger = LoggerFactory.getLogger(LocalTransaction.class);
private final List<Action> _postTransactionActions = new ArrayList<Action>();
private volatile TransactionLog.Transaction _transaction;
private TransactionLog _transactionLog;
private long _txnStartTime = 0L;
public LocalTransaction(TransactionLog transactionLog)
{
_transactionLog = transactionLog;
}
public boolean inTransaction()
{
return _transaction != null;
}
public long getTransactionStartTime()
{
return _txnStartTime;
}
public void addPostTransactionAction(Action postTransactionAction)
{
_postTransactionActions.add(postTransactionAction);
}
public void dequeue(BaseQueue queue, EnqueableMessage message, Action postTransactionAction)
{
_postTransactionActions.add(postTransactionAction);
if(message.isPersistent() && queue.isDurable())
{
try
{
if (_logger.isDebugEnabled())
{
_logger.debug("Dequeue of message number " + message.getMessageNumber() + " from transaction log. Queue : " + queue.getNameShortString());
}
beginTranIfNecessary();
_transaction.dequeueMessage(queue, message.getMessageNumber());
}
catch(AMQException e)
{
_logger.error("Error during message dequeues", e);
tidyUpOnError(e);
}
}
}
public void dequeue(Collection<QueueEntry> queueEntries, Action postTransactionAction)
{
_postTransactionActions.add(postTransactionAction);
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.getNameShortString());
}
beginTranIfNecessary();
_transaction.dequeueMessage(queue, message.getMessageNumber());
}
}
}
catch(AMQException e)
{
_logger.error("Error during message dequeues", e);
tidyUpOnError(e);
}
}
private void tidyUpOnError(Exception e)
{
try
{
for(Action action : _postTransactionActions)
{
action.onRollback();
}
}
finally
{
try
{
if (_transaction != null)
{
_transaction.abortTran();
}
}
catch (Exception abortException)
{
_logger.error("Abort transaction failed while trying to handle previous error", abortException);
}
finally
{
resetDetails();
}
}
throw new RuntimeException(e);
}
private void beginTranIfNecessary()
{
if(_transaction == null)
{
try
{
_transaction = _transactionLog.newTransaction();
}
catch (Exception e)
{
tidyUpOnError(e);
}
}
}
public void enqueue(BaseQueue queue, EnqueableMessage message, Action postTransactionAction)
{
_postTransactionActions.add(postTransactionAction);
if(message.isPersistent() && queue.isDurable())
{
try
{
if (_logger.isDebugEnabled())
{
_logger.debug("Enqueue of message number " + message.getMessageNumber() + " to transaction log. Queue : " + queue.getNameShortString());
}
beginTranIfNecessary();
_transaction.enqueueMessage(queue, message.getMessageNumber());
}
catch (Exception e)
{
_logger.error("Error during message enqueue", e);
tidyUpOnError(e);
}
}
}
public void enqueue(List<? extends BaseQueue> queues, EnqueableMessage message, Action postTransactionAction)
{
_postTransactionActions.add(postTransactionAction);
if (_txnStartTime == 0L)
{
_txnStartTime = System.currentTimeMillis();
}
if(message.isPersistent())
{
try
{
for(BaseQueue queue : queues)
{
if(queue.isDurable())
{
if (_logger.isDebugEnabled())
{
_logger.debug("Enqueue of message number " + message.getMessageNumber() + " to transaction log. Queue : " + queue.getNameShortString() );
}
beginTranIfNecessary();
_transaction.enqueueMessage(queue, message.getMessageNumber());
}
}
}
catch (Exception e)
{
_logger.error("Error during message enqueue", e);
tidyUpOnError(e);
}
}
}
public void commit()
{
try
{
if(_transaction != null)
{
_transaction.commitTran();
}
for(Action action : _postTransactionActions)
{
action.postCommit();
}
}
catch (Exception e)
{
_logger.error("Failed to commit transaction", e);
for(Action action : _postTransactionActions)
{
action.onRollback();
}
throw new RuntimeException("Failed to commit transaction", e);
}
finally
{
resetDetails();
}
}
public void rollback()
{
try
{
if(_transaction != null)
{
_transaction.abortTran();
}
}
catch (AMQException e)
{
_logger.error("Failed to rollback transaction", e);
throw new RuntimeException("Failed to rollback transaction", e);
}
finally
{
try
{
for(Action action : _postTransactionActions)
{
action.onRollback();
}
}
finally
{
resetDetails();
}
}
}
private void resetDetails()
{
_transaction = null;
_postTransactionActions.clear();
_txnStartTime = 0L;
}
}
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