| /** |
| * 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.twitter.distributedlog.benchmark.utils; |
| |
| import com.google.common.util.concurrent.RateLimiter; |
| |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * A wrapper over rate limiter |
| */ |
| public class ShiftableRateLimiter implements Runnable { |
| |
| private final RateLimiter rateLimiter; |
| private final ScheduledExecutorService executor; |
| private final double initialRate, maxRate, changeRate; |
| private double nextRate; |
| |
| public ShiftableRateLimiter(double initialRate, |
| double maxRate, |
| double changeRate, |
| long changeInterval, |
| TimeUnit changeIntervalUnit) { |
| this.initialRate = initialRate; |
| this.maxRate = maxRate; |
| this.changeRate = changeRate; |
| this.nextRate = initialRate; |
| this.rateLimiter = RateLimiter.create(initialRate); |
| this.executor = Executors.newSingleThreadScheduledExecutor(); |
| this.executor.scheduleAtFixedRate(this, changeInterval, changeInterval, changeIntervalUnit); |
| } |
| |
| @Override |
| public void run() { |
| this.nextRate = Math.min(nextRate + changeRate, maxRate); |
| this.rateLimiter.setRate(nextRate); |
| } |
| |
| public RateLimiter getLimiter() { |
| return this.rateLimiter; |
| } |
| } |