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PrecisPublishLimiter.java
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PrecisPublishLimiter.java
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/**
* 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.service;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import org.apache.pulsar.common.policies.data.Policies;
import org.apache.pulsar.common.policies.data.PublishRate;
import org.apache.pulsar.common.util.RateLimitFunction;
import org.apache.pulsar.common.util.RateLimiter;
public class PrecisPublishLimiter implements PublishRateLimiter {
protected volatile int publishMaxMessageRate = 0;
protected volatile long publishMaxByteRate = 0;
protected volatile boolean publishThrottlingEnabled = false;
// precise mode for publish rate limiter
private volatile RateLimiter topicPublishRateLimiterOnMessage;
private volatile RateLimiter topicPublishRateLimiterOnByte;
private final RateLimitFunction rateLimitFunction;
private final ScheduledExecutorService scheduledExecutorService;
public PrecisPublishLimiter(Policies policies, String clusterName, RateLimitFunction rateLimitFunction) {
this.rateLimitFunction = rateLimitFunction;
update(policies, clusterName);
this.scheduledExecutorService = null;
}
public PrecisPublishLimiter(PublishRate publishRate, RateLimitFunction rateLimitFunction) {
this(publishRate, rateLimitFunction, null);
}
public PrecisPublishLimiter(PublishRate publishRate, RateLimitFunction rateLimitFunction,
ScheduledExecutorService scheduledExecutorService) {
this.rateLimitFunction = rateLimitFunction;
update(publishRate);
this.scheduledExecutorService = scheduledExecutorService;
}
@Override
public void checkPublishRate() {
// No-op
}
@Override
public void incrementPublishCount(int numOfMessages, long msgSizeInBytes) {
// No-op
}
@Override
public boolean resetPublishCount() {
return true;
}
@Override
public boolean isPublishRateExceeded() {
return false;
}
// If all rate limiters are not exceeded, re-enable auto read from socket.
private void tryReleaseConnectionThrottle() {
RateLimiter currentTopicPublishRateLimiterOnMessage = topicPublishRateLimiterOnMessage;
RateLimiter currentTopicPublishRateLimiterOnByte = topicPublishRateLimiterOnByte;
if ((currentTopicPublishRateLimiterOnMessage != null
&& currentTopicPublishRateLimiterOnMessage.getAvailablePermits() <= 0)
|| (currentTopicPublishRateLimiterOnByte != null
&& currentTopicPublishRateLimiterOnByte.getAvailablePermits() <= 0)) {
return;
}
this.rateLimitFunction.apply();
}
@Override
public void update(Policies policies, String clusterName) {
final PublishRate maxPublishRate = policies.publishMaxMessageRate != null
? policies.publishMaxMessageRate.get(clusterName)
: null;
this.update(maxPublishRate);
}
public void update(PublishRate maxPublishRate) {
replaceLimiters(() -> {
if (maxPublishRate != null
&& (maxPublishRate.publishThrottlingRateInMsg > 0
|| maxPublishRate.publishThrottlingRateInByte > 0)) {
this.publishThrottlingEnabled = true;
this.publishMaxMessageRate = Math.max(maxPublishRate.publishThrottlingRateInMsg, 0);
this.publishMaxByteRate = Math.max(maxPublishRate.publishThrottlingRateInByte, 0);
if (this.publishMaxMessageRate > 0) {
topicPublishRateLimiterOnMessage =
new RateLimiter(publishMaxMessageRate, 1, TimeUnit.SECONDS,
this::tryReleaseConnectionThrottle, true);
}
if (this.publishMaxByteRate > 0) {
topicPublishRateLimiterOnByte =
new RateLimiter(publishMaxByteRate, 1, TimeUnit.SECONDS,
this::tryReleaseConnectionThrottle, true);
}
} else {
this.publishMaxMessageRate = 0;
this.publishMaxByteRate = 0;
this.publishThrottlingEnabled = false;
}
});
}
@Override
public boolean tryAcquire(int numbers, long bytes) {
RateLimiter currentTopicPublishRateLimiterOnMessage = topicPublishRateLimiterOnMessage;
RateLimiter currentTopicPublishRateLimiterOnByte = topicPublishRateLimiterOnByte;
return (currentTopicPublishRateLimiterOnMessage == null
|| currentTopicPublishRateLimiterOnMessage.tryAcquire(numbers))
&& (currentTopicPublishRateLimiterOnByte == null
|| currentTopicPublishRateLimiterOnByte.tryAcquire(bytes));
}
@Override
public void close() throws Exception {
rateLimitFunction.apply();
replaceLimiters(null);
}
private void replaceLimiters(Runnable updater) {
RateLimiter previousTopicPublishRateLimiterOnMessage = topicPublishRateLimiterOnMessage;
topicPublishRateLimiterOnMessage = null;
RateLimiter previousTopicPublishRateLimiterOnByte = topicPublishRateLimiterOnByte;
topicPublishRateLimiterOnByte = null;
try {
if (updater != null) {
updater.run();
}
} finally {
// Close previous limiters to prevent resource leakages.
// Delay closing of previous limiters after new ones are in place so that updating the limiter
// doesn't cause unavailability.
if (previousTopicPublishRateLimiterOnMessage != null) {
previousTopicPublishRateLimiterOnMessage.close();
}
if (previousTopicPublishRateLimiterOnByte != null) {
previousTopicPublishRateLimiterOnByte.close();
}
}
}
}