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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.handler;
import org.apache.log4j.Logger;
import org.apache.qpid.AMQException;
import org.apache.qpid.framing.BasicGetBody;
import org.apache.qpid.framing.BasicGetEmptyBody;
import org.apache.qpid.framing.MethodRegistry;
import org.apache.qpid.framing.AMQShortString;
import org.apache.qpid.framing.FieldTable;
import org.apache.qpid.protocol.AMQConstant;
import org.apache.qpid.server.AMQChannel;
import org.apache.qpid.server.message.AMQMessage;
import org.apache.qpid.server.flow.FlowCreditManager;
import org.apache.qpid.server.flow.MessageOnlyCreditManager;
import org.apache.qpid.server.subscription.SubscriptionImpl;
import org.apache.qpid.server.subscription.ClientDeliveryMethod;
import org.apache.qpid.server.subscription.RecordDeliveryMethod;
import org.apache.qpid.server.subscription.Subscription;
import org.apache.qpid.server.subscription.SubscriptionFactoryImpl;
import org.apache.qpid.server.protocol.AMQProtocolSession;
import org.apache.qpid.server.protocol.AMQSessionModel;
import org.apache.qpid.server.queue.AMQQueue;
import org.apache.qpid.server.queue.QueueEntry;
import org.apache.qpid.server.state.AMQStateManager;
import org.apache.qpid.server.state.StateAwareMethodListener;
import org.apache.qpid.server.virtualhost.VirtualHost;
public class BasicGetMethodHandler implements StateAwareMethodListener<BasicGetBody>
{
private static final Logger _log = Logger.getLogger(BasicGetMethodHandler.class);
private static final BasicGetMethodHandler _instance = new BasicGetMethodHandler();
public static BasicGetMethodHandler getInstance()
{
return _instance;
}
private BasicGetMethodHandler()
{
}
public void methodReceived(AMQStateManager stateManager, BasicGetBody body, int channelId) throws AMQException
{
AMQProtocolSession protocolConnection = stateManager.getProtocolSession();
VirtualHost vHost = protocolConnection.getVirtualHost();
AMQChannel channel = protocolConnection.getChannel(channelId);
if (channel == null)
{
throw body.getChannelNotFoundException(channelId);
}
else
{
AMQQueue queue = body.getQueue() == null ? channel.getDefaultQueue() : vHost.getQueueRegistry().getQueue(body.getQueue());
if (queue == null)
{
_log.info("No queue for '" + body.getQueue() + "'");
if(body.getQueue()!=null)
{
throw body.getConnectionException(AMQConstant.NOT_FOUND,
"No such queue, '" + body.getQueue()+ "'");
}
else
{
throw body.getConnectionException(AMQConstant.NOT_ALLOWED,
"No queue name provided, no default queue defined.");
}
}
else
{
if (queue.isExclusive())
{
AMQSessionModel session = queue.getExclusiveOwningSession();
if (session == null || session.getConnectionModel() != protocolConnection)
{
throw body.getConnectionException(AMQConstant.NOT_ALLOWED,
"Queue is exclusive, but not created on this Connection.");
}
}
if (!performGet(queue,protocolConnection, channel, !body.getNoAck()))
{
MethodRegistry methodRegistry = protocolConnection.getMethodRegistry();
// TODO - set clusterId
BasicGetEmptyBody responseBody = methodRegistry.createBasicGetEmptyBody(null);
protocolConnection.writeFrame(responseBody.generateFrame(channelId));
}
}
}
}
public static boolean performGet(final AMQQueue queue,
final AMQProtocolSession session,
final AMQChannel channel,
final boolean acks)
throws AMQException
{
final FlowCreditManager singleMessageCredit = new MessageOnlyCreditManager(1L);
final ClientDeliveryMethod getDeliveryMethod = new ClientDeliveryMethod()
{
int _msg;
public void deliverToClient(final Subscription sub, final QueueEntry entry, final long deliveryTag)
throws AMQException
{
singleMessageCredit.useCreditForMessage(entry.getMessage());
if(entry.getMessage() instanceof AMQMessage)
{
session.getProtocolOutputConverter().writeGetOk(entry, channel.getChannelId(),
deliveryTag, queue.getMessageCount());
}
else
{
//TODO Convert AMQP 0-10 message
throw new AMQException(AMQConstant.NOT_IMPLEMENTED, "Not implemented conversion of 0-10 message", null);
}
}
};
final RecordDeliveryMethod getRecordMethod = new RecordDeliveryMethod()
{
public void recordMessageDelivery(final Subscription sub, final QueueEntry entry, final long deliveryTag)
{
channel.addUnacknowledgedMessage(entry, deliveryTag, null);
}
};
Subscription sub;
if(acks)
{
sub = SubscriptionFactoryImpl.INSTANCE.createSubscription(channel, session, null, acks, null, false, singleMessageCredit, getDeliveryMethod, getRecordMethod);
}
else
{
sub = new GetNoAckSubscription(channel,
session,
null,
null,
false,
singleMessageCredit,
getDeliveryMethod,
getRecordMethod);
}
queue.registerSubscription(sub,false);
queue.flushSubscription(sub);
queue.unregisterSubscription(sub);
return(!singleMessageCredit.hasCredit());
}
public static final class GetNoAckSubscription extends SubscriptionImpl.NoAckSubscription
{
public GetNoAckSubscription(AMQChannel channel, AMQProtocolSession protocolSession,
AMQShortString consumerTag, FieldTable filters,
boolean noLocal, FlowCreditManager creditManager,
ClientDeliveryMethod deliveryMethod,
RecordDeliveryMethod recordMethod)
throws AMQException
{
super(channel, protocolSession, consumerTag, filters, noLocal, creditManager, deliveryMethod, recordMethod);
}
public boolean isTransient()
{
return true;
}
public boolean wouldSuspend(QueueEntry msg)
{
return !getCreditManager().useCreditForMessage(msg.getMessage());
}
}
}
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