/*+
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 * Copyright (c) 2000, 2011, 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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+
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#include "precompiled.hpp"+
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#include "classfile/javaClasses.hpp"+
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#include "memory/referencePolicy.hpp"+
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#include "memory/universe.hpp"+
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#include "runtime/arguments.hpp"+
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#include "runtime/globals.hpp"+
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+
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LRUCurrentHeapPolicy::LRUCurrentHeapPolicy() {+
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  setup();+
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}+
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+
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// Capture state (of-the-VM) information needed to evaluate the policy+
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void LRUCurrentHeapPolicy::setup() {+
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  _max_interval = (Universe::get_heap_free_at_last_gc() / M) * SoftRefLRUPolicyMSPerMB;+
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  assert(_max_interval >= 0,"Sanity check");+
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}+
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+
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// The oop passed in is the SoftReference object, and not+
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// the object the SoftReference points to.+
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bool LRUCurrentHeapPolicy::should_clear_reference(oop p,+
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                                                  jlong timestamp_clock) {+
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  jlong interval = timestamp_clock - java_lang_ref_SoftReference::timestamp(p);+
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  assert(interval >= 0, "Sanity check");+
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+
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  // The interval will be zero if the ref was accessed since the last scavenge/gc.+
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  if(interval <= _max_interval) {+
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    return false;+
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  }+
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+
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  return true;+
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}+
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+
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/////////////////////// MaxHeap //////////////////////+
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+
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LRUMaxHeapPolicy::LRUMaxHeapPolicy() {+
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  setup();+
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}+
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+
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// Capture state (of-the-VM) information needed to evaluate the policy+
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void LRUMaxHeapPolicy::setup() {+
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  size_t max_heap = MaxHeapSize;+
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  max_heap -= Universe::get_heap_used_at_last_gc();+
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  max_heap /= M;+
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+
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  _max_interval = max_heap * SoftRefLRUPolicyMSPerMB;+
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  assert(_max_interval >= 0,"Sanity check");+
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}+
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+
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// The oop passed in is the SoftReference object, and not+
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// the object the SoftReference points to.+
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bool LRUMaxHeapPolicy::should_clear_reference(oop p,+
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                                             jlong timestamp_clock) {+
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  jlong interval = timestamp_clock - java_lang_ref_SoftReference::timestamp(p);+
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  assert(interval >= 0, "Sanity check");+
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+
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  // The interval will be zero if the ref was accessed since the last scavenge/gc.+
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  if(interval <= _max_interval) {+
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    return false;+
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  }+
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+
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  return true;+
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}+
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