org.glassfish.external.statistics.impl.RangeStatisticImpl Maven / Gradle / Ivy
/*
* Copyright (c) 2009, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.glassfish.external.statistics.impl;
import org.glassfish.external.statistics.RangeStatistic;
import java.util.Map;
import java.lang.reflect.*;
/**
* @author Sreenivas Munnangi
*/
public final class RangeStatisticImpl extends StatisticImpl
implements RangeStatistic, InvocationHandler {
private long currentVal = 0L;
private long highWaterMark = Long.MIN_VALUE;
private long lowWaterMark = Long.MAX_VALUE;
private final long initCurrentVal;
private final long initHighWaterMark;
private final long initLowWaterMark;
private final RangeStatistic rs =
(RangeStatistic) Proxy.newProxyInstance(
RangeStatistic.class.getClassLoader(),
new Class[] { RangeStatistic.class },
this);
public RangeStatisticImpl(long curVal, long highMark, long lowMark,
String name, String unit, String desc,
long startTime, long sampleTime) {
super(name, unit, desc, startTime, sampleTime);
currentVal = curVal;
initCurrentVal = curVal;
highWaterMark = highMark;
initHighWaterMark = highMark;
lowWaterMark = lowMark;
initLowWaterMark = lowMark;
}
public synchronized RangeStatistic getStatistic() {
return rs;
}
public synchronized Map getStaticAsMap() {
Map m = super.getStaticAsMap();
m.put("current", getCurrent());
m.put("lowwatermark", getLowWaterMark());
m.put("highwatermark", getHighWaterMark());
return m;
}
public synchronized long getCurrent() {
return currentVal;
}
public synchronized void setCurrent(long curVal) {
currentVal = curVal;
lowWaterMark = (curVal >= lowWaterMark ? lowWaterMark : curVal);
highWaterMark = (curVal >= highWaterMark ? curVal : highWaterMark);
sampleTime = System.currentTimeMillis();
}
/**
* Returns the highest value of this statistic, since measurement started.
*/
public synchronized long getHighWaterMark() {
return highWaterMark;
}
public synchronized void setHighWaterMark(long hwm) {
highWaterMark = hwm;
}
/**
* Returns the lowest value of this statistic, since measurement started.
*/
public synchronized long getLowWaterMark() {
return lowWaterMark;
}
public synchronized void setLowWaterMark(long lwm) {
lowWaterMark = lwm;
}
@Override
public synchronized void reset() {
super.reset();
currentVal = initCurrentVal;
highWaterMark = initHighWaterMark;
lowWaterMark = initLowWaterMark;
sampleTime = -1L;
}
public synchronized String toString() {
return super.toString() + NEWLINE +
"Current: " + getCurrent() + NEWLINE +
"LowWaterMark: " + getLowWaterMark() + NEWLINE +
"HighWaterMark: " + getHighWaterMark();
}
// todo: equals implementation
public Object invoke(Object proxy, Method m, Object[] args) throws Throwable {
checkMethod(m);
Object result;
try {
result = m.invoke(this, args);
} catch (InvocationTargetException e) {
throw e.getTargetException();
} catch (Exception e) {
throw new RuntimeException("unexpected invocation exception: " +
e.getMessage());
}
return result;
}
}