1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with 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,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 *
19 */
20 package org.apache.directory.api.ldap.model.message;
21
22
23 import java.util.Observable;
24 import java.util.Observer;
25
26
27 /**
28 * The base abandonable request message class. All such requests have a response
29 * type.
30 *
31 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
32 */
33 public class AbstractAbandonableRequest extends AbstractRequest implements AbandonableRequest
34 {
35 static final long serialVersionUID = -4511116249089399040L;
36
37 /** Flag indicating whether or not this request returns a response. */
38 private boolean abandoned = false;
39
40 private RequestObservable o;
41
42
43 /**
44 * Subclasses must provide these parameters via a super constructor call.
45 *
46 * @param id
47 * the sequential message identifier
48 * @param type
49 * the request type enum
50 */
51 protected AbstractAbandonableRequest( final int id, final MessageTypeEnum type )
52 {
53 super( id, type, true );
54 }
55
56
57 public void abandon()
58 {
59 if ( abandoned )
60 {
61 return;
62 }
63
64 abandoned = true;
65 if ( o == null )
66 {
67 o = new RequestObservable();
68 }
69 o.setChanged();
70 o.notifyObservers();
71 o.deleteObservers();
72 }
73
74
75 public boolean isAbandoned()
76 {
77 return abandoned;
78 }
79
80
81 /**
82 * {@inheritDoc}
83 */
84 public AbandonableRequest addAbandonListener( final AbandonListener listener )
85 {
86 if ( o == null )
87 {
88 o = new RequestObservable();
89 }
90
91 o.addObserver( new Observer()
92 {
93 public void update( Observable o, Object arg )
94 {
95 listener.requestAbandoned( AbstractAbandonableRequest.this );
96 }
97 } );
98
99 return this;
100 }
101
102 // False positive
103 static class RequestObservable extends Observable
104 {
105 @Override
106 public void setChanged()
107 {
108 super.setChanged();
109 }
110 }
111 }