org.apache.rocketmq.client.java.impl.producer.PublishingLoadBalancer Maven / Gradle / Ivy
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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.rocketmq.client.java.impl.producer;
import org.apache.rocketmq.shaded.com.google.common.base.Objects;
import org.apache.rocketmq.shaded.com.google.common.base.Predicate;
import org.apache.rocketmq.shaded.com.google.common.collect.ImmutableList;
import org.apache.rocketmq.shaded.com.google.common.hash.Hashing;
import org.apache.rocketmq.shaded.com.google.common.math.IntMath;
import org.apache.rocketmq.shaded.com.google.common.math.LongMath;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;
import javax.annotation.concurrent.Immutable;
import org.apache.rocketmq.shaded.commons.lang3.RandomUtils;
import org.apache.rocketmq.client.java.misc.Utilities;
import org.apache.rocketmq.client.java.route.Broker;
import org.apache.rocketmq.client.java.route.Endpoints;
import org.apache.rocketmq.client.java.route.MessageQueueImpl;
import org.apache.rocketmq.client.java.route.TopicRouteData;
@Immutable
public class PublishingLoadBalancer {
/**
* Index for round-robin.
*/
private final AtomicInteger index;
/**
* Message queues to send message.
*/
private final ImmutableList messageQueues;
public PublishingLoadBalancer(TopicRouteData topicRouteData) {
this(new AtomicInteger(RandomUtils.nextInt(0, Integer.MAX_VALUE)), topicRouteData);
}
private PublishingLoadBalancer(AtomicInteger index, TopicRouteData topicRouteData) {
this.index = index;
final List mqs = topicRouteData.getMessageQueues().stream()
.filter((Predicate) mq -> mq.getPermission().isWritable() &&
Utilities.MASTER_BROKER_ID == mq.getBroker().getId())
.collect(Collectors.toList());
if (mqs.isEmpty()) {
throw new IllegalArgumentException("No writable message queue found, topiRouteData=" + topicRouteData);
}
this.messageQueues = ImmutableList.builder().addAll(mqs).build();
}
PublishingLoadBalancer update(TopicRouteData topicRouteData) {
return new PublishingLoadBalancer(index, topicRouteData);
}
public MessageQueueImpl takeMessageQueueByMessageGroup(String messageGroup) {
final long hashCode = Hashing.sipHash24().hashBytes(messageGroup.getBytes(StandardCharsets.UTF_8)).asLong();
final int index = LongMath.mod(hashCode, messageQueues.size());
return messageQueues.get(index);
}
public List takeMessageQueues(Set excluded, int count) {
int next = index.getAndIncrement();
List candidates = new ArrayList<>();
Set candidateBrokerNames = new HashSet<>();
for (int i = 0; i < messageQueues.size(); i++) {
final MessageQueueImpl messageQueueImpl = messageQueues.get(IntMath.mod(next++, messageQueues.size()));
final Broker broker = messageQueueImpl.getBroker();
final String brokerName = broker.getName();
if (!excluded.contains(broker.getEndpoints()) && !candidateBrokerNames.contains(brokerName)) {
candidateBrokerNames.add(brokerName);
candidates.add(messageQueueImpl);
}
if (candidates.size() >= count) {
return candidates;
}
}
// If all endpoints are isolated.
if (candidates.isEmpty()) {
for (int i = 0; i < messageQueues.size(); i++) {
final MessageQueueImpl messageQueueImpl = messageQueues.get(IntMath.mod(next++, messageQueues.size()));
final Broker broker = messageQueueImpl.getBroker();
final String brokerName = broker.getName();
if (!candidateBrokerNames.contains(brokerName)) {
candidateBrokerNames.add(brokerName);
candidates.add(messageQueueImpl);
}
if (candidates.size() >= count) {
break;
}
}
}
return candidates;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
PublishingLoadBalancer that = (PublishingLoadBalancer) o;
return Objects.equal(messageQueues, that.messageQueues);
}
@Override
public int hashCode() {
return Objects.hashCode(messageQueues);
}
}