src/hotspot/share/gc/shared/referencePolicy.hpp
author stefank
Fri, 24 Nov 2017 15:48:01 +0100
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8191861: Move and refactor hSpaceCounters Reviewed-by: pliden, ehelin, rkennke
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/*
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 * Copyright (c) 2000, 2015, 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_GC_SHARED_REFERENCEPOLICY_HPP
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#define SHARE_VM_GC_SHARED_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<mtGC> {
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 public:
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  virtual bool should_clear_reference(oop p, jlong timestamp_clock) {
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    ShouldNotReachHere();
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    return true;
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  }
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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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  virtual bool should_clear_reference(oop p, jlong timestamp_clock) {
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    return false;
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  }
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};
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class AlwaysClearPolicy : public ReferencePolicy {
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 public:
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  virtual bool should_clear_reference(oop p, jlong timestamp_clock) {
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    return true;
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  }
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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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  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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  virtual bool should_clear_reference(oop p, jlong timestamp_clock);
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};
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class LRUMaxHeapPolicy : public ReferencePolicy {
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  jlong _max_interval;
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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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  virtual bool should_clear_reference(oop p, jlong timestamp_clock);
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};
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#endif // SHARE_VM_GC_SHARED_REFERENCEPOLICY_HPP