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ISSUE-5366 Allow executing some listeners synchronously (#1438)
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223 changes: 223 additions & 0 deletions
223
.../event-bus-redis/src/main/java/org/apache/james/events/TmailGroupRegistrationHandler.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. * | ||
| ****************************************************************/ | ||
|
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| package org.apache.james.events; | ||
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| import static org.apache.james.backends.rabbitmq.Constants.AUTO_DELETE; | ||
| import static org.apache.james.backends.rabbitmq.Constants.DURABLE; | ||
| import static org.apache.james.backends.rabbitmq.Constants.EMPTY_ROUTING_KEY; | ||
| import static org.apache.james.backends.rabbitmq.Constants.EXCLUSIVE; | ||
| import static org.apache.james.backends.rabbitmq.Constants.REQUEUE; | ||
| import static org.apache.james.backends.rabbitmq.Constants.evaluateAutoDelete; | ||
| import static org.apache.james.backends.rabbitmq.Constants.evaluateDurable; | ||
| import static org.apache.james.backends.rabbitmq.Constants.evaluateExclusive; | ||
| import static org.apache.james.events.GroupRegistration.DEFAULT_RETRY_COUNT; | ||
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|
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| import java.util.Collection; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Objects; | ||
| import java.util.Optional; | ||
| import java.util.concurrent.ConcurrentHashMap; | ||
| import java.util.function.Predicate; | ||
| import java.util.stream.Stream; | ||
|
|
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| import org.apache.commons.lang3.tuple.Pair; | ||
| import org.apache.james.backends.rabbitmq.RabbitMQConfiguration; | ||
| import org.apache.james.backends.rabbitmq.ReactorRabbitMQChannelPool; | ||
| import org.apache.james.backends.rabbitmq.ReceiverProvider; | ||
| import org.apache.james.util.ReactorUtils; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
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| import com.google.common.collect.ImmutableList; | ||
|
|
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| import reactor.core.Disposable; | ||
| import reactor.core.publisher.Flux; | ||
| import reactor.core.publisher.Mono; | ||
| import reactor.core.scheduler.Scheduler; | ||
| import reactor.core.scheduler.Schedulers; | ||
| import reactor.rabbitmq.AcknowledgableDelivery; | ||
| import reactor.rabbitmq.BindingSpecification; | ||
| import reactor.rabbitmq.ConsumeOptions; | ||
| import reactor.rabbitmq.QueueSpecification; | ||
| import reactor.rabbitmq.Receiver; | ||
| import reactor.rabbitmq.Sender; | ||
| import reactor.util.retry.Retry; | ||
|
|
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| class TmailGroupRegistrationHandler { | ||
| private static final Logger LOGGER = LoggerFactory.getLogger(TmailGroupRegistrationHandler.class); | ||
|
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| public static class GroupRegistrationHandlerGroup extends Group { | ||
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| } | ||
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| static final Group GROUP = new GroupRegistrationHandlerGroup(); | ||
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| private final NamingStrategy namingStrategy; | ||
| private final Map<Group, GroupRegistration> groupRegistrations; | ||
| private final EventSerializer eventSerializer; | ||
| private final ReactorRabbitMQChannelPool channelPool; | ||
| private final Sender sender; | ||
| private final ReceiverProvider receiverProvider; | ||
| private final RetryBackoffConfiguration retryBackoff; | ||
| private final EventDeadLetters eventDeadLetters; | ||
| private final ListenerExecutor listenerExecutor; | ||
| private final RabbitMQConfiguration configuration; | ||
| private final GroupRegistration.WorkQueueName queueName; | ||
| private final Scheduler scheduler; | ||
| private Optional<Disposable> consumer; | ||
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| TmailGroupRegistrationHandler(NamingStrategy namingStrategy, EventSerializer eventSerializer, ReactorRabbitMQChannelPool channelPool, Sender sender, ReceiverProvider receiverProvider, | ||
| RetryBackoffConfiguration retryBackoff, | ||
| EventDeadLetters eventDeadLetters, ListenerExecutor listenerExecutor, EventBusId eventBusId, RabbitMQConfiguration configuration) { | ||
| this.namingStrategy = namingStrategy; | ||
| this.eventSerializer = eventSerializer; | ||
| this.channelPool = channelPool; | ||
| this.sender = sender; | ||
| this.receiverProvider = receiverProvider; | ||
| this.retryBackoff = retryBackoff; | ||
| this.eventDeadLetters = eventDeadLetters; | ||
| this.listenerExecutor = listenerExecutor; | ||
| this.configuration = configuration; | ||
| this.groupRegistrations = new ConcurrentHashMap<>(); | ||
| this.queueName = namingStrategy.workQueue(GROUP); | ||
| this.scheduler = Schedulers.newBoundedElastic(EventBus.EXECUTION_RATE, ReactorUtils.DEFAULT_BOUNDED_ELASTIC_QUEUESIZE, "groups-handler"); | ||
| this.consumer = Optional.empty(); | ||
| } | ||
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| Stream<GroupRegistration> synchronousGroupRegistrations() { | ||
| return groupRegistrations.entrySet() | ||
| .stream() | ||
| .filter(registration -> RabbitMQAndRedisEventBus.shouldBeExecutedSynchronously(registration.getKey())) | ||
| .map(Map.Entry::getValue); | ||
| } | ||
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| Stream<GroupRegistration> asynchronousGroupRegistrations() { | ||
| return groupRegistrations.entrySet() | ||
| .stream() | ||
| .filter(registration -> !RabbitMQAndRedisEventBus.shouldBeExecutedSynchronously(registration.getKey())) | ||
| .map(Map.Entry::getValue); | ||
| } | ||
|
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| GroupRegistration retrieveGroupRegistration(Group group) { | ||
| return Optional.ofNullable(groupRegistrations.get(group)) | ||
| .orElseThrow(() -> new GroupRegistrationNotFound(group)); | ||
| } | ||
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| public void start() { | ||
| channelPool.createWorkQueue( | ||
| QueueSpecification.queue(queueName.asString()) | ||
| .durable(evaluateDurable(DURABLE, configuration.isQuorumQueuesUsed())) | ||
| .exclusive(evaluateExclusive(!EXCLUSIVE, configuration.isQuorumQueuesUsed())) | ||
| .autoDelete(evaluateAutoDelete(!AUTO_DELETE, configuration.isQuorumQueuesUsed())) | ||
| .arguments(configuration.workQueueArgumentsBuilder() | ||
| .deadLetter(namingStrategy.deadLetterExchange()) | ||
| .build()), | ||
| BindingSpecification.binding() | ||
| .exchange(namingStrategy.exchange()) | ||
| .queue(queueName.asString()) | ||
| .routingKey(EMPTY_ROUTING_KEY)) | ||
| .retryWhen(Retry.backoff(retryBackoff.getMaxRetries(), retryBackoff.getFirstBackoff()).jitter(retryBackoff.getJitterFactor()).scheduler(Schedulers.boundedElastic())) | ||
| .block(); | ||
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| this.consumer = Optional.of(consumeWorkQueue()); | ||
| } | ||
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| private Disposable consumeWorkQueue() { | ||
| return Flux.using( | ||
| receiverProvider::createReceiver, | ||
| receiver -> receiver.consumeManualAck(queueName.asString(), new ConsumeOptions().qos(EventBus.EXECUTION_RATE)), | ||
| Receiver::close) | ||
| .filter(delivery -> Objects.nonNull(delivery.getBody())) | ||
| .flatMap(this::deliver, EventBus.EXECUTION_RATE) | ||
| .subscribeOn(scheduler) | ||
| .subscribe(); | ||
| } | ||
|
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| private Mono<Void> deliver(AcknowledgableDelivery acknowledgableDelivery) { | ||
| byte[] eventAsBytes = acknowledgableDelivery.getBody(); | ||
|
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| return deserializeEvents(eventAsBytes) | ||
| .flatMapIterable(events -> asynchronousGroupRegistrations() | ||
| .map(group -> Pair.of(group, events)) | ||
| .collect(ImmutableList.toImmutableList())) | ||
| .flatMap(event -> event.getLeft().runListenerReliably(DEFAULT_RETRY_COUNT, event.getRight())) | ||
| .then(Mono.<Void>fromRunnable(acknowledgableDelivery::ack).subscribeOn(Schedulers.boundedElastic())) | ||
| .then() | ||
| .onErrorResume(e -> { | ||
| LOGGER.error("Unable to process delivery for group {}", GROUP, e); | ||
| return Mono.fromRunnable(() -> acknowledgableDelivery.nack(!REQUEUE)) | ||
| .subscribeOn(Schedulers.boundedElastic()) | ||
| .then(); | ||
| }); | ||
| } | ||
|
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| private Mono<List<Event>> deserializeEvents(byte[] eventAsBytes) { | ||
| return Mono.fromCallable(() -> eventSerializer.asEventsFromBytes(eventAsBytes)); | ||
| } | ||
|
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| void stop() { | ||
| groupRegistrations.values().forEach(groupRegistration -> Mono.from(groupRegistration.unregister()).block()); | ||
| consumer.ifPresent(Disposable::dispose); | ||
| Optional.ofNullable(scheduler).ifPresent(Scheduler::dispose); | ||
| } | ||
|
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| void restart() { | ||
| Optional<Disposable> previousConsumer = consumer; | ||
| consumer = Optional.of(consumeWorkQueue()); | ||
| previousConsumer | ||
| .filter(Predicate.not(Disposable::isDisposed)) | ||
| .ifPresent(Disposable::dispose); | ||
|
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| groupRegistrations.values() | ||
| .forEach(GroupRegistration::restart); | ||
| } | ||
|
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| Registration register(EventListener.ReactiveEventListener listener, Group group) { | ||
| if (groupRegistrations.isEmpty()) { | ||
| start(); | ||
| } | ||
| return groupRegistrations | ||
| .compute(group, (groupToRegister, oldGroupRegistration) -> { | ||
| if (oldGroupRegistration != null) { | ||
| throw new GroupAlreadyRegistered(group); | ||
| } | ||
| return newGroupRegistration(listener, groupToRegister); | ||
| }) | ||
| .start(); | ||
| } | ||
|
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| private GroupRegistration newGroupRegistration(EventListener.ReactiveEventListener listener, Group group) { | ||
| return new GroupRegistration( | ||
| namingStrategy, channelPool, sender, | ||
| receiverProvider, | ||
| eventSerializer, | ||
| listener, | ||
| group, | ||
| retryBackoff, | ||
| eventDeadLetters, | ||
| () -> groupRegistrations.remove(group), | ||
| listenerExecutor, configuration); | ||
| } | ||
|
|
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| Collection<Group> registeredGroups() { | ||
| return groupRegistrations.keySet(); | ||
| } | ||
| } |
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