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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
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package org.apache.qpid.server.handler;
import org.apache.qpid.AMQException;
import org.apache.qpid.protocol.AMQConstant;
import org.apache.qpid.framing.BasicConsumeBody;
import org.apache.qpid.framing.BasicConsumeOkBody;
import org.apache.qpid.framing.ConnectionCloseBody;
import org.apache.qpid.server.AMQChannel;
import org.apache.qpid.server.ConsumerTagNotUniqueException;
import org.apache.qpid.server.exchange.ExchangeRegistry;
import org.apache.qpid.server.protocol.AMQMethodEvent;
import org.apache.qpid.server.protocol.AMQProtocolSession;
import org.apache.qpid.server.queue.QueueRegistry;
import org.apache.qpid.server.queue.AMQQueue;
import org.apache.qpid.server.state.AMQStateManager;
import org.apache.qpid.server.state.StateAwareMethodListener;
import org.apache.log4j.Logger;
public class BasicConsumeMethodHandler implements StateAwareMethodListener<BasicConsumeBody>
{
private static final Logger _log = Logger.getLogger(BasicConsumeMethodHandler.class);
private static final BasicConsumeMethodHandler _instance = new BasicConsumeMethodHandler();
public static BasicConsumeMethodHandler getInstance()
{
return _instance;
}
private BasicConsumeMethodHandler()
{
}
public void methodReceived(AMQStateManager stateManager, QueueRegistry queueRegistry,
ExchangeRegistry exchangeRegistry, AMQProtocolSession session,
AMQMethodEvent<BasicConsumeBody> evt) throws AMQException
{
BasicConsumeBody body = evt.getMethod();
final int channelId = evt.getChannelId();
AMQChannel channel = session.getChannel(channelId);
if (channel == null)
{
_log.error("Channel " + channelId + " not found");
// TODO: either alert or error that the
}
else
{
AMQQueue queue = body.queue == null ? channel.getDefaultQueue() : queueRegistry.getQueue(body.queue);
if(queue == null)
{
_log.info("No queue for '" + body.queue + "'");
}
try
{
String consumerTag = channel.subscribeToQueue(body.consumerTag, queue, session, !body.noAck);
if(!body.nowait)
{
session.writeFrame(BasicConsumeOkBody.createAMQFrame(channelId, consumerTag));
}
//now allow queue to start async processing of any backlog of messages
queue.deliverAsync();
}
catch(ConsumerTagNotUniqueException e)
{
String msg = "Non-unique consumer tag, '" + body.consumerTag + "'";
session.writeFrame(ConnectionCloseBody.createAMQFrame(channelId, AMQConstant.NOT_ALLOWED.getCode(), msg, BasicConsumeBody.CLASS_ID, BasicConsumeBody.METHOD_ID));
}
}
}
}