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comparison src/share/vm/memory/referencePolicy.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c96030fff130
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-1:000000000000 0:a61af66fc99e
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 };