1 /*
2 Copyright 2010 Ramon Servadei
3
4 Licensed under the Apache License, Version 2.0 (the "License");
5 you may not use this file except in compliance with the License.
6 You may obtain a copy of the License at
7
8 http://www.apache.org/licenses/LICENSE-2.0
9
10 Unless required by applicable law or agreed to in writing, software
11 distributed under the License is distributed on an "AS IS" BASIS,
12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 See the License for the specific language governing permissions and
14 limitations under the License.
15 */
16 package mirrormap.commands;
17
18 import java.io.Serializable;
19
20 import mirrormap.MirrorMap;
21
22 /**
23 * Encapsulates a command to put a key-value entry into a {@link MirrorMap}.
24 *
25 * @author Ramon Servadei
26 */
27 public final class UpdateCommand extends AddCommand
28 {
29 private static final long serialVersionUID = 1L;
30
31 public UpdateCommand()
32 {
33 super();
34 }
35
36 public UpdateCommand(String mirrorMapName, Serializable key,
37 Serializable value)
38 {
39 super(mirrorMapName, key, value);
40 }
41
42 @Override
43 protected boolean shouldExecute(
44 final MirrorMap<Serializable, Serializable> mirrorMap)
45 {
46 // for updates, we only execute if the value is NOT the same identity
47 return !this.value.equals(mirrorMap.get(this.key));
48 }
49
50 }