| /** |
| * 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 com.alibaba.jstorm.utils; |
| |
| import java.util.Random; |
| import java.util.concurrent.atomic.AtomicInteger; |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| /** |
| * |
| * statistics tuples: sampling event |
| * |
| * |
| * @author yannian/Longda |
| * |
| */ |
| public class EventSampler { |
| private volatile int freq; |
| private AtomicInteger i = new AtomicInteger(0); |
| private volatile int target; |
| private Random r = new Random(); |
| |
| public EventSampler(int freq) { |
| this.freq = freq; |
| this.target = r.nextInt(freq); |
| |
| if (freq / 4 > 1) { |
| intervalCheck.setInterval(freq / 4); |
| } |
| } |
| |
| /** |
| * select 1/freq |
| * |
| * @return |
| */ |
| public boolean countCheck() { |
| i.incrementAndGet(); |
| if (i.get() > freq) { |
| target = r.nextInt(freq); |
| i.set(0); |
| } |
| if (i.get() == target) { |
| return true; |
| } |
| return false; |
| } |
| |
| private AtomicInteger counter = new AtomicInteger(0); |
| private AtomicLong sum = new AtomicLong(0); |
| private IntervalCheck intervalCheck = new IntervalCheck(); |
| |
| public Integer tpsCheck() { |
| int send = counter.incrementAndGet(); |
| |
| Double pastSeconds = intervalCheck.checkAndGet(); |
| if (pastSeconds != null) { |
| counter.set(0); |
| |
| return Integer.valueOf((int) (send / pastSeconds)); |
| |
| } |
| |
| return null; |
| } |
| |
| public Integer timesCheck() { |
| int send = counter.incrementAndGet(); |
| |
| Double pastSeconds = intervalCheck.checkAndGet(); |
| if (pastSeconds != null) { |
| counter.set(0); |
| |
| return send; |
| |
| } |
| |
| return null; |
| } |
| |
| public Pair<Integer, Double> avgCheck(long one) { |
| int send = counter.incrementAndGet(); |
| long total = sum.addAndGet(one); |
| |
| Double pastSeconds = intervalCheck.checkAndGet(); |
| if (pastSeconds != null) { |
| counter.set(0); |
| sum.set(0); |
| |
| Double avg = Double.valueOf(0); |
| if (send != 0) { |
| avg = ((double) total) / send; |
| } |
| |
| return new Pair<Integer, Double>(send, avg); |
| |
| } |
| |
| return null; |
| } |
| } |