View Javadoc

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  package org.apache.directmemory.memory.allocator;
20  
21  import java.lang.reflect.Field;
22  
23  @SuppressWarnings( "restriction" )
24  public final class UnsafeUtils
25  {
26  
27      private static final sun.misc.Unsafe UNSAFE;
28  
29      static
30      {
31          sun.misc.Unsafe unsafe;
32          try
33          {
34              Field unsafeField = sun.misc.Unsafe.class.getDeclaredField( "theUnsafe" );
35              unsafeField.setAccessible( true );
36              unsafe = (sun.misc.Unsafe) unsafeField.get( null );
37          }
38          catch ( Exception e )
39          {
40              unsafe = null;
41          }
42  
43          UNSAFE = unsafe;
44      }
45  
46      private UnsafeUtils()
47      {
48      }
49  
50      public static sun.misc.Unsafe getUnsafe()
51      {
52          return UNSAFE;
53      }
54  }