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Diffstat (limited to 'sparkybe-onap-service/src/main/java/org/onap/aai/sparky/analytics/AveragingRingBuffer.java')
-rw-r--r-- | sparkybe-onap-service/src/main/java/org/onap/aai/sparky/analytics/AveragingRingBuffer.java | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/sparkybe-onap-service/src/main/java/org/onap/aai/sparky/analytics/AveragingRingBuffer.java b/sparkybe-onap-service/src/main/java/org/onap/aai/sparky/analytics/AveragingRingBuffer.java new file mode 100644 index 0000000..fd5f277 --- /dev/null +++ b/sparkybe-onap-service/src/main/java/org/onap/aai/sparky/analytics/AveragingRingBuffer.java @@ -0,0 +1,121 @@ +/** + * ============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.onap.aai.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); + } + + } + +} |