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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      public static void addShutDownHook( Thread hook )
36      {
37          try
38          {
39              Runtime.getRuntime().addShutdownHook( hook );
40          }
41          catch ( IllegalStateException ignore )
42          {
43              // ignore
44          }
45          catch ( AccessControlException ignore )
46          {
47              // ignore
48          }
49      }
50  
51      public static void removeShutdownHook( Thread hook )
52      {
53          try
54          {
55              Runtime.getRuntime().removeShutdownHook( hook );
56          }
57          catch ( IllegalStateException ignore )
58          {
59              // ignore
60          }
61          catch ( AccessControlException ignore )
62          {
63              // ignore
64          }
65      }
66  
67  }