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/*
*
* 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 java.util.LinkedList;
import java.util.List;
import org.apache.log4j.Logger;
import org.apache.qpid.AMQException;
import org.apache.qpid.server.AMQChannel;
import org.apache.qpid.server.RequiredDeliveryException;
import org.apache.qpid.server.ack.UnacknowledgedMessageMap;
import org.apache.qpid.server.protocol.AMQProtocolSession;
import org.apache.qpid.server.queue.*;
import org.apache.qpid.server.store.MessageStore;
import org.apache.qpid.server.store.StoreContext;
/** @author Apache Software Foundation */
public class NonTransactionalContext implements TransactionalContext
{
private static final Logger _log = Logger.getLogger(NonTransactionalContext.class);
/** Channel is useful for logging */
private final AMQChannel _channel;
/** Where to put undeliverable messages */
private final List<RequiredDeliveryException> _returnMessages;
private final MessageStore _messageStore;
private final StoreContext _storeContext;
/** Whether we are in a transaction */
private boolean _inTran;
public NonTransactionalContext(MessageStore messageStore, StoreContext storeContext, AMQChannel channel,
List<RequiredDeliveryException> returnMessages)
{
_channel = channel;
_storeContext = storeContext;
_returnMessages = returnMessages;
_messageStore = messageStore;
}
public StoreContext getStoreContext()
{
return _storeContext;
}
public void beginTranIfNecessary() throws AMQException
{
if (!_inTran)
{
_messageStore.beginTran(_storeContext);
_inTran = true;
}
}
public void commit() throws AMQException
{
// Does not apply to this context
}
public void rollback() throws AMQException
{
// Does not apply to this context
}
public void deliver(final AMQQueue queue, AMQMessage message) throws AMQException
{
QueueEntry entry = queue.enqueue(_storeContext, message);
queue.checkCapacity(_channel);
//following check implements the functionality
//required by the 'immediate' flag:
if(entry.immediateAndNotDelivered())
{
_returnMessages.add(new NoConsumersException(entry.getMessage()));
}
}
public void requeue(QueueEntry entry) throws AMQException
{
entry.requeue(_storeContext);
}
public void acknowledgeMessage(final long deliveryTag, long lastDeliveryTag,
boolean multiple, final UnacknowledgedMessageMap unacknowledgedMessageMap)
throws AMQException
{
final boolean debug = _log.isDebugEnabled();
;
if (multiple)
{
if (deliveryTag == 0)
{
//Spec 2.1.6.11 ... If the multiple field is 1, and the delivery tag is zero,
// tells the server to acknowledge all outstanding mesages.
_log.info("Multiple ack on delivery tag 0. ACKing all messages. Current count:" +
unacknowledgedMessageMap.size());
unacknowledgedMessageMap.visit(new UnacknowledgedMessageMap.Visitor()
{
public boolean callback(final long deliveryTag, QueueEntry message) throws AMQException
{
if (debug)
{
_log.debug("Discarding message: " + message.getMessage().getMessageId());
}
if(message.getMessage().isPersistent())
{
beginTranIfNecessary();
}
//Message has been ack so discard it. This will dequeue and decrement the reference.
message.discard(_storeContext);
return false;
}
public void visitComplete()
{
unacknowledgedMessageMap.clear();
}
});
}
else
{
if (!unacknowledgedMessageMap.contains(deliveryTag))
{
throw new AMQException("Multiple ack on delivery tag " + deliveryTag + " not known for channel");
}
unacknowledgedMessageMap.drainTo(deliveryTag, _storeContext);
}
}
else
{
QueueEntry msg;
msg = unacknowledgedMessageMap.get(deliveryTag);
if (msg == null)
{
_log.info("Single ack on delivery tag " + deliveryTag + " not known for channel:" +
_channel.getChannelId());
throw new AMQException("Single ack on delivery tag " + deliveryTag + " not known for channel:" +
_channel.getChannelId());
}
if (debug)
{
_log.debug("Discarding message: " + msg.getMessage().getMessageId());
}
if(msg.getMessage().isPersistent())
{
beginTranIfNecessary();
}
//Message has been ack so discard it. This will dequeue and decrement the reference.
msg.discard(_storeContext);
unacknowledgedMessageMap.remove(deliveryTag);
if (debug)
{
_log.debug("Received non-multiple ack for messaging with delivery tag " + deliveryTag + " msg id " +
msg.getMessage().getMessageId());
}
}
if(_inTran)
{
_messageStore.commitTran(_storeContext);
_inTran = false;
}
}
public void messageFullyReceived(boolean persistent) throws AMQException
{
if (persistent)
{
_messageStore.commitTran(_storeContext);
_inTran = false;
}
}
public void messageProcessed(AMQProtocolSession protocolSession) throws AMQException
{
_channel.processReturns();
}
}
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