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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;
import org.apache.qpid.server.ack.UnacknowledgedMessageMap;
import org.apache.qpid.server.queue.QueueEntry;
import org.apache.qpid.server.store.MessageStore;
import org.apache.qpid.server.subscription.Subscription;
import org.apache.qpid.server.txn.ServerTransaction;
import org.apache.qpid.server.txn.AutoCommitTransaction;
import org.apache.qpid.AMQException;
import org.apache.log4j.Logger;
import java.util.Map;
public class ExtractResendAndRequeue implements UnacknowledgedMessageMap.Visitor
{
private static final Logger _log = Logger.getLogger(ExtractResendAndRequeue.class);
private final Map<Long, QueueEntry> _msgToRequeue;
private final Map<Long, QueueEntry> _msgToResend;
private final boolean _requeueIfUnabletoResend;
private final UnacknowledgedMessageMap _unacknowledgedMessageMap;
private final MessageStore _transactionLog;
public ExtractResendAndRequeue(UnacknowledgedMessageMap unacknowledgedMessageMap,
Map<Long, QueueEntry> msgToRequeue,
Map<Long, QueueEntry> msgToResend,
boolean requeueIfUnabletoResend,
MessageStore txnLog)
{
_unacknowledgedMessageMap = unacknowledgedMessageMap;
_msgToRequeue = msgToRequeue;
_msgToResend = msgToResend;
_requeueIfUnabletoResend = requeueIfUnabletoResend;
_transactionLog = txnLog;
}
public boolean callback(final long deliveryTag, QueueEntry message) throws AMQException
{
message.setRedelivered();
final Subscription subscription = message.getDeliveredSubscription();
if (subscription != null)
{
// Consumer exists
if (!subscription.isClosed())
{
_msgToResend.put(deliveryTag, message);
}
else // consumer has gone
{
_msgToRequeue.put(deliveryTag, message);
}
}
else
{
// Message has no consumer tag, so was "delivered" to a GET
// or consumer no longer registered
// cannot resend, so re-queue.
if (!message.isQueueDeleted())
{
if (_requeueIfUnabletoResend)
{
_msgToRequeue.put(deliveryTag, message);
}
else
{
dequeueEntry(message);
_log.info("No DeadLetter Queue and requeue not requested so dropping message:" + message);
}
}
else
{
dequeueEntry(message);
_log.warn("Message.queue is null and no DeadLetter Queue so dropping message:" + message);
}
}
// false means continue processing
return false;
}
private void dequeueEntry(final QueueEntry node)
{
ServerTransaction txn = new AutoCommitTransaction(_transactionLog);
dequeueEntry(node, txn);
}
private void dequeueEntry(final QueueEntry node, ServerTransaction txn)
{
txn.dequeue(node.getQueue(), node.getMessage(),
new ServerTransaction.Action()
{
public void postCommit()
{
node.discard();
}
public void onRollback()
{
}
});
}
public void visitComplete()
{
_unacknowledgedMessageMap.clear();
}
}
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