author | ysr |
Thu, 17 Mar 2011 10:32:46 -0700 | |
changeset 8688 | 493d12ccc6db |
parent 7397 | 5b173b4ca846 |
child 10683 | 4b5a5a507864 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_MEMORY_REFERENCEPOLICY_HPP |
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#define SHARE_VM_MEMORY_REFERENCEPOLICY_HPP |
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// referencePolicy is used to determine when soft reference objects |
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// should be cleared. |
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class ReferencePolicy : public CHeapObj { |
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public: |
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virtual bool should_clear_reference(oop p) { ShouldNotReachHere(); return true; } |
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// Capture state (of-the-VM) information needed to evaluate the policy |
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virtual void setup() { /* do nothing */ } |
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}; |
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class NeverClearPolicy : public ReferencePolicy { |
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public: |
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bool should_clear_reference(oop p) { return false; } |
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}; |
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class AlwaysClearPolicy : public ReferencePolicy { |
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public: |
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bool should_clear_reference(oop p) { return true; } |
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}; |
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class LRUCurrentHeapPolicy : public ReferencePolicy { |
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private: |
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jlong _max_interval; |
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public: |
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LRUCurrentHeapPolicy(); |
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// Capture state (of-the-VM) information needed to evaluate the policy |
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void setup(); |
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bool should_clear_reference(oop p); |
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}; |
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class LRUMaxHeapPolicy : public ReferencePolicy { |
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private: |
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jlong _max_interval; |
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public: |
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LRUMaxHeapPolicy(); |
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// Capture state (of-the-VM) information needed to evaluate the policy |
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void setup(); |
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bool should_clear_reference(oop p); |
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}; |
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#endif // SHARE_VM_MEMORY_REFERENCEPOLICY_HPP |