| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.storm.perf; |
| |
| public class ThroughputMeter { |
| |
| private String name; |
| private long startTime = 0; |
| private int count; |
| private long endTime = 0; |
| |
| public ThroughputMeter(String name) { |
| this.name = name; |
| this.startTime = System.currentTimeMillis(); |
| } |
| |
| /** |
| * Calculate throughput. |
| * @return events/sec |
| */ |
| private static double calcThroughput(long count, long startTime, long endTime) { |
| long gap = (endTime - startTime); |
| return (count / gap) * 1000; |
| } |
| |
| public String getName() { |
| return name; |
| } |
| |
| public void record() { |
| ++count; |
| } |
| |
| public double stop() { |
| if (startTime == 0) { |
| return 0; |
| } |
| if (endTime == 0) { |
| this.endTime = System.currentTimeMillis(); |
| } |
| return calcThroughput(count, startTime, endTime); |
| } |
| |
| // Returns the recorded throughput since the last call to getCurrentThroughput() |
| // or since this meter was instantiated if being called for fisrt time. |
| public double getCurrentThroughput() { |
| if (startTime == 0) { |
| return 0; |
| } |
| long currTime = (endTime == 0) ? System.currentTimeMillis() : endTime; |
| |
| double result = calcThroughput(count, startTime, currTime) / 1000; // K/sec |
| startTime = currTime; |
| count = 0; |
| return result; |
| } |
| } |