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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.protocol.v0_8.handler;
import org.apache.log4j.Logger;
import org.apache.qpid.AMQException;
import org.apache.qpid.framing.AMQShortString;
import org.apache.qpid.framing.BasicGetBody;
import org.apache.qpid.framing.BasicGetEmptyBody;
import org.apache.qpid.framing.MethodRegistry;
import org.apache.qpid.protocol.AMQConstant;
import org.apache.qpid.server.message.InstanceProperties;
import org.apache.qpid.server.message.MessageInstance;
import org.apache.qpid.server.message.MessageSource;
import org.apache.qpid.server.message.ServerMessage;
import org.apache.qpid.server.protocol.v0_8.AMQChannel;
import org.apache.qpid.server.flow.FlowCreditManager;
import org.apache.qpid.server.flow.MessageOnlyCreditManager;
import org.apache.qpid.server.protocol.v0_8.AMQMessage;
import org.apache.qpid.server.protocol.v0_8.AMQProtocolSession;
import org.apache.qpid.server.protocol.AMQSessionModel;
import org.apache.qpid.server.protocol.v0_8.ConsumerTarget_0_8;
import org.apache.qpid.server.queue.AMQQueue;
import org.apache.qpid.server.protocol.v0_8.state.AMQStateManager;
import org.apache.qpid.server.protocol.v0_8.state.StateAwareMethodListener;
import org.apache.qpid.server.protocol.v0_8.ClientDeliveryMethod;
import org.apache.qpid.server.protocol.v0_8.RecordDeliveryMethod;
import org.apache.qpid.server.consumer.Consumer;
import org.apache.qpid.server.security.QpidSecurityException;
import org.apache.qpid.server.virtualhost.VirtualHost;
import java.util.EnumSet;
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
{
channel.sync();
AMQQueue queue = body.getQueue() == null ? channel.getDefaultQueue() : vHost.getQueue(body.getQueue().toString());
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.");
}
}
try
{
if (!performGet(queue,protocolConnection, channel, !body.getNoAck()))
{
MethodRegistry methodRegistry = protocolConnection.getMethodRegistry();
// TODO - set clusterId
BasicGetEmptyBody responseBody = methodRegistry.createBasicGetEmptyBody(null);
protocolConnection.writeFrame(responseBody.generateFrame(channelId));
}
}
catch (QpidSecurityException e)
{
throw body.getConnectionException(AMQConstant.ACCESS_REFUSED,
e.getMessage());
}
catch (MessageSource.ExistingExclusiveConsumer e)
{
throw body.getConnectionException(AMQConstant.NOT_ALLOWED,
"Queue has an exclusive consumer");
}
catch (MessageSource.ExistingConsumerPreventsExclusive e)
{
throw body.getConnectionException(AMQConstant.INTERNAL_ERROR,
"The GET request has been evaluated as an exclusive consumer, " +
"this is likely due to a programming error in the Qpid broker");
}
}
}
}
public static boolean performGet(final AMQQueue queue,
final AMQProtocolSession session,
final AMQChannel channel,
final boolean acks)
throws AMQException, QpidSecurityException, MessageSource.ExistingConsumerPreventsExclusive,
MessageSource.ExistingExclusiveConsumer
{
final FlowCreditManager singleMessageCredit = new MessageOnlyCreditManager(1L);
final GetDeliveryMethod getDeliveryMethod =
new GetDeliveryMethod(singleMessageCredit, session, channel, queue);
final RecordDeliveryMethod getRecordMethod = new RecordDeliveryMethod()
{
public void recordMessageDelivery(final Consumer sub, final MessageInstance entry, final long deliveryTag)
{
channel.addUnacknowledgedMessage(entry, deliveryTag, null);
}
};
ConsumerTarget_0_8 target;
EnumSet<Consumer.Option> options = EnumSet.of(Consumer.Option.TRANSIENT, Consumer.Option.ACQUIRES,
Consumer.Option.SEES_REQUEUES);
if(acks)
{
target = ConsumerTarget_0_8.createAckTarget(channel,
AMQShortString.EMPTY_STRING, null,
singleMessageCredit, getDeliveryMethod, getRecordMethod);
}
else
{
target = ConsumerTarget_0_8.createGetNoAckTarget(channel,
AMQShortString.EMPTY_STRING, null,
singleMessageCredit, getDeliveryMethod, getRecordMethod);
}
Consumer sub = queue.addConsumer(target, null, AMQMessage.class, "", options);
sub.flush();
sub.close();
return(getDeliveryMethod.hasDeliveredMessage());
}
private static class GetDeliveryMethod implements ClientDeliveryMethod
{
private final FlowCreditManager _singleMessageCredit;
private final AMQProtocolSession _session;
private final AMQChannel _channel;
private final AMQQueue _queue;
private boolean _deliveredMessage;
public GetDeliveryMethod(final FlowCreditManager singleMessageCredit,
final AMQProtocolSession session,
final AMQChannel channel, final AMQQueue queue)
{
_singleMessageCredit = singleMessageCredit;
_session = session;
_channel = channel;
_queue = queue;
}
@Override
public void deliverToClient(final Consumer sub, final ServerMessage message,
final InstanceProperties props, final long deliveryTag)
{
_singleMessageCredit.useCreditForMessage(message.getSize());
_session.getProtocolOutputConverter().writeGetOk(message,
props,
_channel.getChannelId(),
deliveryTag,
_queue.getMessageCount());
_deliveredMessage = true;
}
public boolean hasDeliveredMessage()
{
return _deliveredMessage;
}
}
}
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