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.log4j.Logger;
24 import org.apache.qpid.AMQException;
25 import org.apache.qpid.framing.*;
26 import org.apache.qpid.protocol.AMQMethodEvent;
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
32 public class ChannelFlowHandler implements StateAwareMethodListener<ChannelFlowBody>
33 {
34 private static final Logger _logger = Logger.getLogger(ChannelFlowHandler.class);
35
36 private static ChannelFlowHandler _instance = new ChannelFlowHandler();
37
38 public static ChannelFlowHandler getInstance()
39 {
40 return _instance;
41 }
42
43 private ChannelFlowHandler()
44 {
45 }
46
47 public void methodReceived(AMQStateManager stateManager, ChannelFlowBody body, int channelId) throws AMQException
48 {
49 AMQProtocolSession session = stateManager.getProtocolSession();
50
51
52 AMQChannel channel = session.getChannel(channelId);
53
54 if (channel == null)
55 {
56 throw body.getChannelNotFoundException(channelId);
57 }
58
59 channel.setSuspended(!body.getActive());
60 _logger.debug("Channel.Flow for channel " + channelId + ", active=" + body.getActive());
61
62 MethodRegistry methodRegistry = session.getMethodRegistry();
63 AMQMethodBody responseBody = methodRegistry.createChannelFlowOkBody(body.getActive());
64 session.writeFrame(responseBody.generateFrame(channelId));
65 }
66 }
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