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Java > Open Source Codes > com > google > inject > util > ReferenceType


1 /**
2  * Copyright (C) 2006 Google Inc.
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
17 package com.google.inject.util;
18
19 /**
20  * Reference type. Used to specify what type of reference to keep to a
21  * referent.
22  *
23  * @see java.lang.ref.Reference
24  * @author crazybob@google.com (Bob Lee)
25  */
26 public enum ReferenceType {
27
28   /**
29    * Prevents referent from being reclaimed by the garbage collector.
30    */
31   STRONG,
32
33   /**
34    * Referent reclaimed in an LRU fashion when the VM runs low on memory and
35    * no strong references exist.
36    *
37    * @see java.lang.ref.SoftReference
38    */
39   SOFT,
40
41   /**
42    * Referent reclaimed when no strong or soft references exist.
43    *
44    * @see java.lang.ref.WeakReference
45    */
46   WEAK,
47
48   /**
49    * Similar to weak references except the garbage collector doesn't actually
50    * reclaim the referent. More flexible alternative to finalization.
51    *
52    * @see java.lang.ref.PhantomReference
53    */
54   PHANTOM;
55 }
56
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