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/**
* ============LICENSE_START===================================================
* SPARKY (AAI UI service)
* ============================================================================
* Copyright © 2017 AT&T Intellectual Property.
* Copyright © 2017 Amdocs
* All rights reserved.
* ============================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=====================================================
*
* ECOMP and OpenECOMP are trademarks
* and service marks of AT&T Intellectual Property.
*/
package org.openecomp.sparky.analytics;
import java.util.concurrent.atomic.AtomicInteger;
/**
* TODO: Fill in description.
*
* @author davea
*/
public class AveragingRingBuffer {
private int numElements;
private long[] data;
private AtomicInteger index;
private long average;
private boolean initialAverageCalculated;
/**
* Instantiates a new averaging ring buffer.
*
* @param size the size
*/
public AveragingRingBuffer(int size) {
if (size == 0) {
throw new IllegalArgumentException("Size must be greater than zero");
}
this.initialAverageCalculated = false;
this.numElements = size;
this.data = new long[this.numElements];
this.index = new AtomicInteger(-1);
}
/**
* Calculate average.
*
* @param maxArrayIndex the max array index
*/
private void calculateAverage(int maxArrayIndex) {
long sum = 0;
for (int i = 0; i <= maxArrayIndex; i++) {
sum += data[i];
}
average = (sum / (maxArrayIndex + 1));
}
public long getAvg() {
if (!initialAverageCalculated) {
/*
* until the index rolls once we will calculate the average from the data that has been added
* to the array, not including the zero elements
*/
if (index.get() < 0) {
calculateAverage(0);
} else {
calculateAverage(index.get());
}
}
return average;
}
/**
* Adds the sample.
*
* @param value the value
*/
public synchronized void addSample(long value) {
index.incrementAndGet();
data[index.get()] = value;
if (index.get() == (numElements - 1)) {
calculateAverage(numElements - 1);
if (!initialAverageCalculated) {
initialAverageCalculated = true;
}
index.set(-1);
}
}
}
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