01 /*
02 *
03 * Licensed to the Apache Software Foundation (ASF) under one
04 * or more contributor license agreements. See the NOTICE file
05 * distributed with this work for additional information
06 * regarding copyright ownership. The ASF licenses this file
07 * to you under the Apache License, Version 2.0 (the
08 * "License"); you may not use this file except in compliance
09 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 *
20 */
21 package org.apache.qpid.server.handler;
22
23 import org.apache.qpid.AMQException;
24 import org.apache.qpid.framing.BasicCancelBody;
25 import org.apache.qpid.framing.BasicCancelOkBody;
26 import org.apache.qpid.framing.MethodRegistry;
27 import org.apache.qpid.server.AMQChannel;
28 import org.apache.qpid.server.protocol.AMQProtocolSession;
29 import org.apache.qpid.server.state.AMQStateManager;
30 import org.apache.qpid.server.state.StateAwareMethodListener;
31 import org.apache.log4j.Logger;
32
33 public class BasicCancelMethodHandler implements StateAwareMethodListener<BasicCancelBody>
34 {
35 private static final Logger _log = Logger.getLogger(BasicCancelMethodHandler.class);
36
37 private static final BasicCancelMethodHandler _instance = new BasicCancelMethodHandler();
38
39 public static BasicCancelMethodHandler getInstance()
40 {
41 return _instance;
42 }
43
44 private BasicCancelMethodHandler()
45 {
46 }
47
48 public void methodReceived(AMQStateManager stateManager, BasicCancelBody body, int channelId) throws AMQException
49 {
50 AMQProtocolSession session = stateManager.getProtocolSession();
51
52 final AMQChannel channel = session.getChannel(channelId);
53
54
55 if (channel == null)
56 {
57 throw body.getChannelNotFoundException(channelId);
58 }
59
60 if (_log.isDebugEnabled())
61 {
62 _log.debug("BasicCancel: for:" + body.getConsumerTag() +
63 " nowait:" + body.getNowait());
64 }
65
66 channel.unsubscribeConsumer(body.getConsumerTag());
67 if (!body.getNowait())
68 {
69 MethodRegistry methodRegistry = session.getMethodRegistry();
70 BasicCancelOkBody cancelOkBody = methodRegistry.createBasicCancelOkBody(body.getConsumerTag());
71 session.writeFrame(cancelOkBody.generateFrame(channelId));
72 }
73 }
74 }
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