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/*
* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package nsk.share.gc.gp;
import nsk.share.TestBug;
/**
* This class encapsulates notions like "many objects of small size",
* "small number of objects of big size".
*/
public abstract class MemoryStrategy {
private static int smallNumber = 100;
public abstract long getSize(long memory);
public abstract long getSize(long memory, long objectExtra);
public abstract int getCount(long memory);
public abstract int getCount(long memory, long objectExtra);
protected MemoryStrategy() {
}
/**
* Small object size, big number of objects.
*/
public static final MemoryStrategy LOW = new MemoryStrategy() {
public long getSize(long memory) {
return getSize(memory, 0);
}
public long getSize(long memory, long objectExtra) {
return smallNumber;
}
public int getCount(long memory) {
return getCount(memory, 0);
}
public int getCount(long memory, long objectExtra) {
return (int) Math.min(Integer.MAX_VALUE, memory / (getSize(memory) + objectExtra));
}
public String toString() {
return "low";
}
};
/**
* Medium object size, medium number of objects.
*/
public static final MemoryStrategy MEDIUM = new MemoryStrategy() {
public long getSize(long memory) {
return getSize(memory, 0);
}
public long getSize(long memory, long objectExtra) {
return Math.round(Math.floor(Math.sqrt(memory)));
}
public int getCount(long memory) {
return getCount(memory, 0);
}
public int getCount(long memory, long objectExtra) {
return (int) Math.min(Integer.MAX_VALUE, memory / (getSize(memory) + objectExtra));
}
public String toString() {
return "medium";
}
};
/**
* Big object size, small number of objects.
*/
public static final MemoryStrategy HIGH = new MemoryStrategy() {
public long getSize(long memory) {
return getSize(memory, 0);
}
public long getSize(long memory, long objectExtra) {
return memory / getCount(memory, objectExtra);
}
public int getCount(long memory) {
return getCount(memory, 0);
}
public int getCount(long memory, long objectExtra) {
return smallNumber;
}
public String toString() {
return "high";
}
};
/**
* Get memory strategy by identifier.
*
* @param id identifier
* @return memory strategy for this identifier
* @throws TestBug if id is invalid
*/
public static MemoryStrategy fromString(String id) {
if (id.equalsIgnoreCase("low"))
return LOW;
else if (id.equalsIgnoreCase("medium"))
return MEDIUM;
else if (id.equalsIgnoreCase("high"))
return HIGH;
else
throw new TestBug("Unknown memory strategy identifier: " + id);
}
}
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