Command


1   /**
2    *
3    * Licensed to the Apache Software Foundation (ASF) under one or more
4    * contributor license agreements.  See the NOTICE file distributed with
5    * this work for additional information regarding copyright ownership.
6    * The ASF licenses this file to You under the Apache License, Version 2.0
7    * (the "License"); you may not use this file except in compliance with
8    * the License.  You may obtain a copy of the License at
9    *
10   * http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.activemq.command;
19  
20  import org.apache.activemq.state.CommandVisitor;
21  
22  /**
23   * The Command Pattern so that we can send and receive commands
24   * on the different transports
25   *
26   * @version $Revision: 1.7 $
27   */
28  public interface Command extends DataStructure {
29      
30      void setCommandId(int value);
31      
32      /**
33       * @return the unique ID of this request used to map responses to requests
34       */
35      int getCommandId();
36      
37      void setResponseRequired(boolean responseRequired);
38      boolean isResponseRequired();
39      
40      boolean isResponse();
41      boolean isMessageDispatch();
42      boolean isBrokerInfo();
43      boolean isWireFormatInfo();
44      boolean isMessage();
45      boolean isMessageAck();
46      boolean isMessageDispatchNotification();
47      boolean isShutdownInfo();
48  
49      Response visit( CommandVisitor visitor) throws Exception  ;
50  
51      /**
52       * The endpoint within the transport where this message came from which could be null if the 
53       * transport only supports a single endpoint.
54       */
55      public Endpoint getFrom();
56  
57      public void setFrom(Endpoint from);
58  
59      /**
60       * The endpoint within the transport where this message is going to - null means all endpoints.
61       */
62      public Endpoint getTo();
63  
64      public void setTo(Endpoint to);
65  }
66
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