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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2009-2012 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
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* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
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* and therefore, elected the GPL Version 2 license, then the option applies
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*/
// Portions Copyright [2018] Payara Foundation and/or affiliates
package org.glassfish.flashlight.statistics.impl;
import java.util.concurrent.atomic.AtomicLong;
import org.glassfish.flashlight.datatree.impl.AbstractTreeNode;
import org.glassfish.flashlight.statistics.Average;
import org.jvnet.hk2.annotations.Service;
import org.glassfish.hk2.api.PerLookup;
/**
*
* @author Harpreet Singh
*/
@Service(name = "average")
@PerLookup
public class AverageImpl extends AbstractTreeNode implements Average {
/** DEFAULT_UPPER_BOUND is maximum value Long can attain */
public static final long DEFAULT_MAX_BOUND = java.lang.Long.MAX_VALUE;
/** DEFAULT_LOWER_BOUND is same as DEFAULT_VALUE i.e. 0 */
public static final long DEFAULT_VALUE = java.math.BigInteger.ZERO.longValue();
public static final long DEFAULT_MIN_BOUND = DEFAULT_VALUE;
/** DEFAULT_VALUE of any statistic is 0 */
protected static final String NEWLINE = System.getProperty("line.separator");
AtomicLong min = new AtomicLong (DEFAULT_MIN_BOUND);
AtomicLong max = new AtomicLong(0);
AtomicLong times = new AtomicLong(0);
AtomicLong sum = new AtomicLong(0);
private long startTime = 0;
private AtomicLong lastSampleTime = new AtomicLong(0);
private static final String AVERAGE_NAME = "average";
private static final String AVERAGE_DESCRIPTION = "Average RangeStatistic";
private static final String UNIT = java.lang.Long.class.toString();
public AverageImpl() {
super.name = AVERAGE_NAME;
super.enabled = true;
startTime = System.currentTimeMillis();
}
/*
*
* TBD: Remove reference to getSampleTime -> see comment on getSampleTime
* method
*/
@Override
public void addDataPoint(long value) {
if (min.get() == DEFAULT_MIN_BOUND) // initial seeding
{
min.set(value);
}
if (value < min.get()) {
min.set(value);
} else if (value > max.get()) {
max.set(value);
}
sum.addAndGet(value);
times.incrementAndGet();
// TBD: remove this code, once getSampleTime is refactored
lastSampleTime.set(getSampleTime ());
}
@Override
public double getAverage() {
double total = sum.doubleValue();
double count = times.doubleValue();
double avg = total / count;
return (Double.isNaN(avg) ? 0 : avg);
}
@Override
public void setReset() {
times.set(0);
sum.set(0);
}
@Override
public long getMin() {
return min.get();
}
@Override
public long getMax() {
return max.get();
}
@Override
public String toString() {
return "Statistic " + getClass().getName() + NEWLINE +
"Name: " + getName() + NEWLINE +
"Description: " + getDescription() + NEWLINE +
"Unit: " + getUnit() + NEWLINE +
// "LastSampleTime: " + getLastSampleTime() + NEWLINE +
"StartTime: " + getStartTime();
}
@Override
public Object getValue() {
return getAverage();
}
@Override
public long getSize() {
return times.get();
}
@Override
public long getHighWaterMark() {
return getMax();
}
@Override
public long getLowWaterMark() {
return getMin();
}
@Override
public long getCurrent() {
return Double.valueOf(getAverage()).longValue();
}
@Override
public String getUnit() {
return UNIT;
}
@Override
public String getDescription() {
return AVERAGE_DESCRIPTION;
}
@Override
public long getStartTime() {
return this.startTime;
}
@Override
public long getTotal (){
return sum.get();
}
/*
* TBD
* This is an inefficient implementation. Should schedule a Timer task
* that gets a timeout event every 30s or so and updates this value
*/
private long getSampleTime (){
return System.currentTimeMillis();
}
@Override
public long getLastSampleTime() {
return this.lastSampleTime.longValue();
}
}