jdk8-mips64-public/hotspot: src/share/vm/memory/referencePolicy.hpp@ddce0b7cee93

8072383: resolve conflicts between open and closed ports
Summary: refactor close to remove references to closed ports
Reviewed-by: kvn, simonis, sgehwolf, dholmes

     1 /*

     2  * Copyright (c) 2000, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #ifndef SHARE_VM_MEMORY_REFERENCEPOLICY_HPP

    26 #define SHARE_VM_MEMORY_REFERENCEPOLICY_HPP

    28 // referencePolicy is used to determine when soft reference objects

    29 // should be cleared.

    32 class ReferencePolicy : public CHeapObj<mtGC> {

    33  public:

    34   virtual bool should_clear_reference(oop p, jlong timestamp_clock) {

    35     ShouldNotReachHere();

    36     return true;

    37   }

    39   // Capture state (of-the-VM) information needed to evaluate the policy

    40   virtual void setup() { /* do nothing */ }

    41 };

    43 class NeverClearPolicy : public ReferencePolicy {

    44  public:

    45   virtual bool should_clear_reference(oop p, jlong timestamp_clock) {

    46     return false;

    47   }

    48 };

    50 class AlwaysClearPolicy : public ReferencePolicy {

    51  public:

    52   virtual bool should_clear_reference(oop p, jlong timestamp_clock) {

    53     return true;

    54   }

    55 };

    57 class LRUCurrentHeapPolicy : public ReferencePolicy {

    58  private:

    59   jlong _max_interval;

    61  public:

    62   LRUCurrentHeapPolicy();

    64   // Capture state (of-the-VM) information needed to evaluate the policy

    65   void setup();

    66   virtual bool should_clear_reference(oop p, jlong timestamp_clock);

    67 };

    69 class LRUMaxHeapPolicy : public ReferencePolicy {

    70  private:

    71   jlong _max_interval;

    73  public:

    74   LRUMaxHeapPolicy();

    76   // Capture state (of-the-VM) information needed to evaluate the policy

    77   void setup();

    78   virtual bool should_clear_reference(oop p, jlong timestamp_clock);

    79 };

    81 #endif // SHARE_VM_MEMORY_REFERENCEPOLICY_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/memory/referencePolicy.hpp@ddce0b7cee93

src/share/vm/memory/referencePolicy.hpp