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src/share/vm/memory/referencePolicy.hpp@a61af66fc99e (annotated)

src/share/vm/memory/referencePolicy.hpp

Sat, 01 Dec 2007 00:00:00 +0000

author

duke

date

Sat, 01 Dec 2007 00:00:00 +0000

changeset 435

a61af66fc99e

child 888

c96030fff130

permissions

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duke@435	1	/*
duke@435	2	* Copyright 2000 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	// referencePolicy is used to determine when soft reference objects
duke@435	26	// should be cleared.
duke@435	27
duke@435	28
duke@435	29	class ReferencePolicy : public ResourceObj {
duke@435	30	public:
duke@435	31	virtual bool should_clear_reference(oop p) { ShouldNotReachHere(); return true; }
duke@435	32	};
duke@435	33
duke@435	34	class NeverClearPolicy : public ReferencePolicy {
duke@435	35	public:
duke@435	36	bool should_clear_reference(oop p) { return false; }
duke@435	37	};
duke@435	38
duke@435	39	class AlwaysClearPolicy : public ReferencePolicy {
duke@435	40	public:
duke@435	41	bool should_clear_reference(oop p) { return true; }
duke@435	42	};
duke@435	43
duke@435	44	class LRUCurrentHeapPolicy : public ReferencePolicy {
duke@435	45	private:
duke@435	46	jlong _max_interval;
duke@435	47
duke@435	48	public:
duke@435	49	LRUCurrentHeapPolicy();
duke@435	50
duke@435	51	bool should_clear_reference(oop p);
duke@435	52	};
duke@435	53
duke@435	54	class LRUMaxHeapPolicy : public ReferencePolicy {
duke@435	55	private:
duke@435	56	jlong _max_interval;
duke@435	57
duke@435	58	public:
duke@435	59	LRUMaxHeapPolicy();
duke@435	60
duke@435	61	bool should_clear_reference(oop p);
duke@435	62	};