1 package org.apache.maven.shared.utils.cli;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.security.AccessControlException;
23
24 /**
25 * A shutdown hook that does not throw any exceptions upon container startup/shutdown or security manager
26 * restrictions.
27 *
28 * Incorrect usage of the hook itself may still throw an exception.
29 *
30 * @author Kristian Rosenvold
31 */
32 public class ShutdownHookUtils
33 {
34
35 /**
36 * @param hook The thread hook.
37 */
38 public static void addShutDownHook( Thread hook )
39 {
40 try
41 {
42 Runtime.getRuntime().addShutdownHook( hook );
43 }
44 catch ( IllegalStateException ignore )
45 {
46 // ignore
47 }
48 catch ( AccessControlException ignore )
49 {
50 // ignore
51 }
52 }
53
54 /**
55 * @param hook The hook which should be removed.
56 */
57 public static void removeShutdownHook( Thread hook )
58 {
59 try
60 {
61 Runtime.getRuntime().removeShutdownHook( hook );
62 }
63 catch ( IllegalStateException ignore )
64 {
65 // ignore
66 }
67 catch ( AccessControlException ignore )
68 {
69 // ignore
70 }
71 }
72
73 }