| /** |
| * Copyright 2016 Yahoo Inc. |
| * |
| * 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. |
| */ |
| package org.apache.bookkeeper.mledger.util; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import java.util.concurrent.atomic.LongAdder; |
| |
| /** |
| */ |
| public class Rate { |
| // Counters |
| private final LongAdder valueAdder = new LongAdder(); |
| private final LongAdder countAdder = new LongAdder(); |
| |
| // Computed stats |
| private long count = 0; |
| private double rate = 0.0d; |
| private double valueRate = 0.0d; |
| private double averageValue = 0.0d; |
| private long lastCalculatedTime = System.nanoTime(); |
| |
| public void recordEvent() { |
| countAdder.increment(); |
| } |
| |
| public void recordEvent(long value) { |
| valueAdder.add(value); |
| countAdder.increment(); |
| } |
| |
| public void recordMultipleEvents(long events, long totalValue) { |
| valueAdder.add(totalValue); |
| countAdder.add(events); |
| } |
| |
| public void calculateRate() { |
| double period = (System.nanoTime() - lastCalculatedTime) / 1e9; |
| calculateRate(period); |
| lastCalculatedTime = System.nanoTime(); |
| } |
| |
| public void calculateRate(double period) { |
| checkArgument(period != 0); |
| |
| count = countAdder.sumThenReset(); |
| long sum = valueAdder.sumThenReset(); |
| averageValue = count != 0 ? sum / count : 0.0d; |
| rate = count / period; |
| valueRate = sum / period; |
| } |
| |
| public long getCount() { |
| return count; |
| } |
| |
| public double getAverageValue() { |
| return averageValue; |
| } |
| |
| public double getRate() { |
| return rate; |
| } |
| |
| public double getValueRate() { |
| return valueRate; |
| } |
| } |