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ResourceGroupPublishLimiter.java
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ResourceGroupPublishLimiter.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.resourcegroup;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import org.apache.pulsar.broker.resourcegroup.ResourceGroup.BytesAndMessagesCount;
import org.apache.pulsar.broker.service.PublishRateLimiter;
import org.apache.pulsar.common.policies.data.Policies;
import org.apache.pulsar.common.policies.data.PublishRate;
import org.apache.pulsar.common.policies.data.ResourceGroup;
import org.apache.pulsar.common.util.RateLimitFunction;
import org.apache.pulsar.common.util.RateLimiter;
public class ResourceGroupPublishLimiter implements PublishRateLimiter, RateLimitFunction, AutoCloseable {
protected volatile int publishMaxMessageRate = 0;
protected volatile long publishMaxByteRate = 0;
protected volatile boolean publishThrottlingEnabled = false;
private volatile RateLimiter publishRateLimiterOnMessage;
private volatile RateLimiter publishRateLimiterOnByte;
private final ScheduledExecutorService scheduledExecutorService;
ConcurrentHashMap<String, RateLimitFunction> rateLimitFunctionMap = new ConcurrentHashMap<>();
public ResourceGroupPublishLimiter(ResourceGroup resourceGroup, ScheduledExecutorService scheduledExecutorService) {
this.scheduledExecutorService = scheduledExecutorService;
update(resourceGroup);
}
@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;
}
@Override
public void update(Policies policies, String clusterName) {
// No-op
}
@Override
public void update(PublishRate maxPublishRate) {
// No-op
}
public void update(BytesAndMessagesCount maxPublishRate) {
this.publishMaxMessageRate = (int) maxPublishRate.messages;
this.publishMaxByteRate = maxPublishRate.bytes;
}
public BytesAndMessagesCount getResourceGroupPublishValues() {
BytesAndMessagesCount bmc = new BytesAndMessagesCount();
bmc.bytes = this.publishMaxByteRate;
bmc.messages = this.publishMaxMessageRate;
return bmc;
}
public void update(ResourceGroup resourceGroup) {
replaceLimiters(() -> {
if (resourceGroup != null
&& (resourceGroup.getPublishRateInMsgs() > 0 || resourceGroup.getPublishRateInBytes() > 0)) {
this.publishThrottlingEnabled = true;
this.publishMaxMessageRate = Math.max(resourceGroup.getPublishRateInMsgs(), 0);
this.publishMaxByteRate = Math.max(resourceGroup.getPublishRateInBytes(), 0);
if (this.publishMaxMessageRate > 0) {
// TODO: pass the executor
publishRateLimiterOnMessage =
new RateLimiter(publishMaxMessageRate, 1, TimeUnit.SECONDS, this::apply);
}
if (this.publishMaxByteRate > 0) {
// TODO: pass the executor
publishRateLimiterOnByte =
new RateLimiter(publishMaxByteRate, 1, TimeUnit.SECONDS, this::apply);
}
} else {
this.publishMaxMessageRate = 0;
this.publishMaxByteRate = 0;
this.publishThrottlingEnabled = false;
publishRateLimiterOnMessage = null;
publishRateLimiterOnByte = null;
}
});
}
public boolean tryAcquire(int numbers, long bytes) {
return (publishRateLimiterOnMessage == null || publishRateLimiterOnMessage.tryAcquire(numbers))
&& (publishRateLimiterOnByte == null || publishRateLimiterOnByte.tryAcquire(bytes));
}
public void registerRateLimitFunction(String name, RateLimitFunction func) {
rateLimitFunctionMap.put(name, func);
}
public void unregisterRateLimitFunction(String name) {
rateLimitFunctionMap.remove(name);
}
private void replaceLimiters(Runnable updater) {
RateLimiter previousPublishRateLimiterOnMessage = publishRateLimiterOnMessage;
publishRateLimiterOnMessage = null;
RateLimiter previousPublishRateLimiterOnByte = publishRateLimiterOnByte;
publishRateLimiterOnByte = 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 (previousPublishRateLimiterOnMessage != null) {
previousPublishRateLimiterOnMessage.close();
}
if (previousPublishRateLimiterOnByte != null) {
previousPublishRateLimiterOnByte.close();
}
}
}
@Override
public void close() {
this.apply();
replaceLimiters(null);
}
@Override
public void apply() {
for (Map.Entry<String, RateLimitFunction> entry: rateLimitFunctionMap.entrySet()) {
entry.getValue().apply();
}
}
}