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GH-3192: pub-sub DSL for broker-backed channels (#3193)

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* GH-3192: pub-sub DSL for broker-backed channels

Fixes https://github.com/spring-projects/spring-integration/issues/3192

* Introduce a `BroadcastCapableChannel` abstract to indicate those `SubscribableChannel`
implementations which can provide a pub-sub functionality
* Implement a `BroadcastCapableChannel` in broker-baked channels with pub-sub option
* Introduce a `BaseIntegrationFlowDefinition.publishSubscribeChannel()` based
on the `BroadcastCapableChannel` and `BroadcastPublishSubscribeSpec` to let to
configure sub-flow subscribers in fluent manner

* * Add some JavaDocs and document new feature

* * Show the channel bean definition in the doc
* Fix typo
This commit is contained in:
Artem Bilan
2020-02-25 13:01:38 -05:00
committed by GitHub
parent 7dbdbdee3f
commit 87c8e47a88
11 changed files with 265 additions and 63 deletions
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17
spring-integration-redis/src/main/java/org/springframework/integration/redis/channel/SubscribableRedisChannel.java
View File

@@ -1,5 +1,5 @@
/*
* Copyright 2002-2019 the original author or authors.
* Copyright 2002-2020 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -32,6 +32,7 @@ import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import org.springframework.integration.MessageDispatchingException;
import org.springframework.integration.channel.AbstractMessageChannel;
import org.springframework.integration.channel.BroadcastCapableChannel;
import org.springframework.integration.channel.ChannelUtils;
import org.springframework.integration.context.IntegrationProperties;
import org.springframework.integration.dispatcher.BroadcastingDispatcher;
@@ -40,13 +41,15 @@ import org.springframework.integration.util.ErrorHandlingTaskExecutor;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageDeliveryException;
import org.springframework.messaging.MessageHandler;
import org.springframework.messaging.SubscribableChannel;
import org.springframework.messaging.converter.MessageConverter;
import org.springframework.util.Assert;
import org.springframework.util.ErrorHandler;
import org.springframework.util.StringUtils;
/**
* An {@link AbstractMessageChannel} implementation with {@link BroadcastCapableChannel}
* aspect to provide a pub-sub semantics to consume messages fgrom Redis topic.
*
* @author Oleg Zhurakousky
* @author Gary Russell
* @author Artem Bilan
@@ -55,7 +58,7 @@ import org.springframework.util.StringUtils;
*/
@SuppressWarnings("rawtypes")
public class SubscribableRedisChannel extends AbstractMessageChannel
implements SubscribableChannel, SmartLifecycle {
implements BroadcastCapableChannel, SmartLifecycle {
private final RedisMessageListenerContainer container = new RedisMessageListenerContainer();
@@ -67,10 +70,6 @@ public class SubscribableRedisChannel extends AbstractMessageChannel
private final BroadcastingDispatcher dispatcher = new BroadcastingDispatcher(true);
private volatile Integer maxSubscribers;
private volatile boolean initialized;
// defaults
private Executor taskExecutor = new SimpleAsyncTaskExecutor();
@@ -78,6 +77,10 @@ public class SubscribableRedisChannel extends AbstractMessageChannel
private MessageConverter messageConverter = new SimpleMessageConverter();
private volatile Integer maxSubscribers;
private volatile boolean initialized;
public SubscribableRedisChannel(RedisConnectionFactory connectionFactory, String topicName) {
Assert.notNull(connectionFactory, "'connectionFactory' must not be null");
Assert.hasText(topicName, "'topicName' must not be empty");