| /* |
| * 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.accumulo.core.util.ratelimit; |
| |
| /** Rate limiter from the Guava library. */ |
| public class GuavaRateLimiter implements RateLimiter { |
| private final com.google.common.util.concurrent.RateLimiter rateLimiter; |
| private long currentRate; |
| |
| /** |
| * Constructor |
| * |
| * @param initialRate |
| * Count of permits which should be made available per second. A non-positive rate is |
| * taken to indicate there should be no limitation on rate. |
| */ |
| public GuavaRateLimiter(long initialRate) { |
| this.currentRate = initialRate; |
| this.rateLimiter = com.google.common.util.concurrent.RateLimiter |
| .create(initialRate > 0 ? initialRate : Long.MAX_VALUE); |
| } |
| |
| @Override |
| public long getRate() { |
| return currentRate; |
| } |
| |
| /** |
| * Change the rate at which permits are made available. |
| * |
| * @param newRate |
| * Count of permits which should be made available per second. A non-positive rate is |
| * taken to indicate that there should be no limitation on rate. |
| */ |
| public void setRate(long newRate) { |
| this.rateLimiter.setRate(newRate > 0 ? newRate : Long.MAX_VALUE); |
| this.currentRate = newRate; |
| } |
| |
| @Override |
| public void acquire(long permits) { |
| if (this.currentRate > 0) { |
| while (permits > Integer.MAX_VALUE) { |
| rateLimiter.acquire(Integer.MAX_VALUE); |
| permits -= Integer.MAX_VALUE; |
| } |
| if (permits > 0) { |
| rateLimiter.acquire((int) permits); |
| } |
| } |
| } |
| } |