| /** |
| * 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.hadoop.hbase.quotas; |
| |
| import org.apache.yetus.audience.InterfaceAudience; |
| import org.apache.yetus.audience.InterfaceStability; |
| import org.apache.hadoop.hbase.util.EnvironmentEdgeManager; |
| |
| /** |
| * This limiter will refill resources at every TimeUnit/resources interval. For example: For a |
| * limiter configured with 10resources/second, then 1 resource will be refilled after every 100ms |
| * (1sec/10resources) |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Evolving |
| public class AverageIntervalRateLimiter extends RateLimiter { |
| private long nextRefillTime = -1L; |
| |
| @Override |
| public long refill(long limit) { |
| final long now = EnvironmentEdgeManager.currentTime(); |
| if (nextRefillTime == -1) { |
| // Till now no resource has been consumed. |
| nextRefillTime = EnvironmentEdgeManager.currentTime(); |
| return limit; |
| } |
| |
| long timeInterval = now - nextRefillTime; |
| long delta = 0; |
| long timeUnitInMillis = super.getTimeUnitInMillis(); |
| if (timeInterval >= timeUnitInMillis) { |
| delta = limit; |
| } else if (timeInterval > 0) { |
| double r = ((double)timeInterval / (double)timeUnitInMillis) * limit; |
| delta = (long)r; |
| } |
| |
| if (delta > 0) { |
| this.nextRefillTime = now; |
| } |
| |
| return delta; |
| } |
| |
| @Override |
| public long getWaitInterval(long limit, long available, long amount) { |
| if (nextRefillTime == -1) { |
| return 0; |
| } |
| |
| double r = ((double)(amount - available)) * super.getTimeUnitInMillis() / limit; |
| return (long)r; |
| } |
| |
| // This method is for strictly testing purpose only |
| @Override |
| public void setNextRefillTime(long nextRefillTime) { |
| this.nextRefillTime = nextRefillTime; |
| } |
| |
| @Override |
| public long getNextRefillTime() { |
| return this.nextRefillTime; |
| } |
| |
| } |