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/*
* Copyright (c) 2008, 2009, 2011, 2012 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.net4j.util.cache;
import org.eclipse.net4j.util.cache.ICacheMonitor.Condition;
/**
* @author Eike Stepper
*/
public class HysteresisConditionPolicy extends ThresholdConditionPolicy
{
private long thresholdYellowRed;
private long thresholdGreenYellow;
public HysteresisConditionPolicy(long thresholdYellowRed, long thresholdRedYellow, long thresholdGreenYellow,
long thresholdYellowGreen)
{
super(thresholdRedYellow, thresholdYellowGreen);
if (thresholdYellowRed > thresholdRedYellow)
{
throw new IllegalArgumentException("thresholdYellowRed > thresholdRedYellow"); //$NON-NLS-1$
}
if (thresholdRedYellow > thresholdGreenYellow)
{
throw new IllegalArgumentException("thresholdRedYellow > thresholdGreenYellow"); //$NON-NLS-1$
}
if (thresholdGreenYellow > thresholdYellowGreen)
{
throw new IllegalArgumentException("thresholdGreenYellow > thresholdYellowGreen"); //$NON-NLS-1$
}
this.thresholdGreenYellow = thresholdGreenYellow;
this.thresholdYellowRed = thresholdYellowRed;
}
public long getThresholdYellowRed()
{
return thresholdYellowRed;
}
public long getThresholdGreenYellow()
{
return thresholdGreenYellow;
}
@Override
protected Condition getNewCondition(Condition oldCondition, long freeMemory)
{
switch (oldCondition)
{
case GREEN:
if (freeMemory < thresholdYellowRed)
{
return Condition.RED;
}
if (freeMemory < thresholdGreenYellow)
{
return Condition.YELLOW;
}
return Condition.GREEN;
case YELLOW:
if (freeMemory < thresholdYellowRed)
{
return Condition.RED;
}
if (freeMemory > getThresholdYellowGreen())
{
return Condition.GREEN;
}
return Condition.YELLOW;
case RED:
if (freeMemory > getThresholdYellowGreen())
{
return Condition.GREEN;
}
if (freeMemory > getThresholdRedYellow())
{
return Condition.YELLOW;
}
return Condition.RED;
default:
throw new IllegalArgumentException("oldCondition == " + oldCondition); //$NON-NLS-1$
}
}
}
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