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.TxRollbackBody;
25 import org.apache.qpid.framing.TxRollbackOkBody;
26 import org.apache.qpid.framing.MethodRegistry;
27 import org.apache.qpid.framing.AMQMethodBody;
28 import org.apache.qpid.protocol.AMQMethodEvent;
29 import org.apache.qpid.server.AMQChannel;
30 import org.apache.qpid.server.protocol.AMQProtocolSession;
31 import org.apache.qpid.server.state.AMQStateManager;
32 import org.apache.qpid.server.state.StateAwareMethodListener;
33
34 public class TxRollbackHandler implements StateAwareMethodListener<TxRollbackBody>
35 {
36 private static TxRollbackHandler _instance = new TxRollbackHandler();
37
38 public static TxRollbackHandler getInstance()
39 {
40 return _instance;
41 }
42
43 private TxRollbackHandler()
44 {
45 }
46
47 public void methodReceived(AMQStateManager stateManager, TxRollbackBody body, int channelId) throws AMQException
48 {
49 AMQProtocolSession session = stateManager.getProtocolSession();
50
51 try
52 {
53 AMQChannel channel = session.getChannel(channelId);
54
55 if (channel == null)
56 {
57 throw body.getChannelNotFoundException(channelId);
58 }
59
60 channel.rollback();
61
62 MethodRegistry methodRegistry = session.getMethodRegistry();
63 AMQMethodBody responseBody = methodRegistry.createTxRollbackOkBody();
64 session.writeFrame(responseBody.generateFrame(channelId));
65
66
67 //Now resend all the unacknowledged messages back to the original subscribers.
68 //(Must be done after the TxnRollback-ok response).
69 // Why, are we not allowed to send messages back to client before the ok method?
70 channel.resend(false);
71 }
72 catch (AMQException e)
73 {
74 throw body.getChannelException(e.getErrorCode(), "Failed to rollback: " + e.getMessage());
75 }
76 }
77 }
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