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benchmark-framework/src/main/java/io/openmessaging/benchmark/utils/UniformRateLimiter.java
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| @@ -0,0 +1,79 @@ | ||
| /** | ||
| * 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 io.openmessaging.benchmark.utils; | ||
|
|
||
| import java.util.concurrent.TimeUnit; | ||
| import java.util.concurrent.atomic.AtomicLongFieldUpdater; | ||
| import java.util.concurrent.locks.LockSupport; | ||
|
|
||
| /** | ||
| * Provides a next operation time for rate limited operation streams.<br> | ||
| * The rate limiter is thread safe and can be shared by all threads. | ||
| */ | ||
| public final class UniformRateLimiter { | ||
|
|
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| private static final AtomicLongFieldUpdater<UniformRateLimiter> V_TIME_UPDATER = | ||
| AtomicLongFieldUpdater.newUpdater(UniformRateLimiter.class, "virtualTime"); | ||
| private static final AtomicLongFieldUpdater<UniformRateLimiter> START_UPDATER = | ||
| AtomicLongFieldUpdater.newUpdater(UniformRateLimiter.class, "start"); | ||
| private static final double ONE_SEC_IN_NS = TimeUnit.SECONDS.toNanos(1); | ||
| private volatile long start = Long.MIN_VALUE; | ||
| private volatile long virtualTime; | ||
| private final double opsPerSec; | ||
| private final long intervalNs; | ||
|
|
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| public UniformRateLimiter(final double opsPerSec) { | ||
| if (Double.isNaN(opsPerSec) || Double.isInfinite(opsPerSec)) { | ||
| throw new IllegalArgumentException("opsPerSec cannot be Nan or Infinite"); | ||
| } | ||
| if (opsPerSec <= 0) { | ||
| throw new IllegalArgumentException("opsPerSec must be greater then 0"); | ||
| } | ||
| this.opsPerSec = opsPerSec; | ||
| intervalNs = Math.round(ONE_SEC_IN_NS / opsPerSec); | ||
| } | ||
|
|
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| public double getOpsPerSec() { | ||
| return opsPerSec; | ||
| } | ||
|
|
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| public long getIntervalNs() { | ||
| return intervalNs; | ||
| } | ||
|
|
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| public long acquire() { | ||
| final long currOpIndex = V_TIME_UPDATER.getAndIncrement(this); | ||
| long start = this.start; | ||
| if (start == Long.MIN_VALUE) { | ||
| start = System.nanoTime(); | ||
| if (!START_UPDATER.compareAndSet(this, Long.MIN_VALUE, start)) { | ||
| start = this.start; | ||
| assert start != Long.MIN_VALUE; | ||
| } | ||
| } | ||
| return start + currOpIndex * intervalNs; | ||
| } | ||
|
|
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| public static void uninterruptibleSleepNs(final long intendedTime) { | ||
| long sleepNs; | ||
| while ((sleepNs = (intendedTime - System.nanoTime())) > 0) { | ||
| LockSupport.parkNanos(sleepNs); | ||
| } | ||
| } | ||
| } |
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