|
0
|
1 /*
|
|
|
2 * Copyright 2000 Sun Microsystems, Inc. All Rights Reserved.
|
|
|
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
|
4 *
|
|
|
5 * This code is free software; you can redistribute it and/or modify it
|
|
|
6 * under the terms of the GNU General Public License version 2 only, as
|
|
|
7 * published by the Free Software Foundation.
|
|
|
8 *
|
|
|
9 * This code is distributed in the hope that it will be useful, but WITHOUT
|
|
|
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
|
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
|
12 * version 2 for more details (a copy is included in the LICENSE file that
|
|
|
13 * accompanied this code).
|
|
|
14 *
|
|
|
15 * You should have received a copy of the GNU General Public License version
|
|
|
16 * 2 along with this work; if not, write to the Free Software Foundation,
|
|
|
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
|
18 *
|
|
|
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
|
|
|
20 * CA 95054 USA or visit www.sun.com if you need additional information or
|
|
|
21 * have any questions.
|
|
|
22 *
|
|
|
23 */
|
|
|
24
|
|
|
25 // referencePolicy is used to determine when soft reference objects
|
|
|
26 // should be cleared.
|
|
|
27
|
|
|
28
|
|
|
29 class ReferencePolicy : public ResourceObj {
|
|
|
30 public:
|
|
|
31 virtual bool should_clear_reference(oop p) { ShouldNotReachHere(); return true; }
|
|
|
32 };
|
|
|
33
|
|
|
34 class NeverClearPolicy : public ReferencePolicy {
|
|
|
35 public:
|
|
|
36 bool should_clear_reference(oop p) { return false; }
|
|
|
37 };
|
|
|
38
|
|
|
39 class AlwaysClearPolicy : public ReferencePolicy {
|
|
|
40 public:
|
|
|
41 bool should_clear_reference(oop p) { return true; }
|
|
|
42 };
|
|
|
43
|
|
|
44 class LRUCurrentHeapPolicy : public ReferencePolicy {
|
|
|
45 private:
|
|
|
46 jlong _max_interval;
|
|
|
47
|
|
|
48 public:
|
|
|
49 LRUCurrentHeapPolicy();
|
|
|
50
|
|
|
51 bool should_clear_reference(oop p);
|
|
|
52 };
|
|
|
53
|
|
|
54 class LRUMaxHeapPolicy : public ReferencePolicy {
|
|
|
55 private:
|
|
|
56 jlong _max_interval;
|
|
|
57
|
|
|
58 public:
|
|
|
59 LRUMaxHeapPolicy();
|
|
|
60
|
|
|
61 bool should_clear_reference(oop p);
|
|
|
62 };
|
