| /* |
| * 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.pulsar.broker.qos; |
| |
| import java.util.function.LongSupplier; |
| |
| /** |
| * A subclass of {@link AsyncTokenBucket} that represents a token bucket with a dynamic rate. |
| * The rate and capacity of the token bucket can change over time based on the rate function and capacity factor. |
| */ |
| public class DynamicRateAsyncTokenBucket extends AsyncTokenBucket { |
| private final LongSupplier rateFunction; |
| private final LongSupplier ratePeriodNanosFunction; |
| private final double capacityFactor; |
| |
| private final double targetFillFactorAfterThrottling; |
| |
| protected DynamicRateAsyncTokenBucket(double capacityFactor, LongSupplier rateFunction, |
| MonotonicSnapshotClock clockSource, LongSupplier ratePeriodNanosFunction, |
| long resolutionNanos, double initialTokensFactor, |
| double targetFillFactorAfterThrottling) { |
| super(clockSource, resolutionNanos); |
| this.capacityFactor = capacityFactor; |
| this.rateFunction = rateFunction; |
| this.ratePeriodNanosFunction = ratePeriodNanosFunction; |
| this.targetFillFactorAfterThrottling = targetFillFactorAfterThrottling; |
| this.tokens = (long) (rateFunction.getAsLong() * initialTokensFactor); |
| tokens(false); |
| } |
| |
| @Override |
| protected long getRatePeriodNanos() { |
| return ratePeriodNanosFunction.getAsLong(); |
| } |
| |
| @Override |
| protected long getTargetAmountOfTokensAfterThrottling() { |
| return (long) (getRate() * targetFillFactorAfterThrottling); |
| } |
| |
| @Override |
| public long getCapacity() { |
| return capacityFactor == 1.0d ? getRate() : (long) (getRate() * capacityFactor); |
| } |
| |
| @Override |
| public long getRate() { |
| return rateFunction.getAsLong(); |
| } |
| |
| } |