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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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15
spring-integration-amqp/src/main/java/org/springframework/integration/amqp/channel/PublishSubscribeAmqpChannel.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.
@@ -25,22 +25,25 @@ import org.springframework.amqp.core.FanoutExchange;
import org.springframework.amqp.core.Queue;
import org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer;
import org.springframework.integration.amqp.support.AmqpHeaderMapper;
import org.springframework.integration.channel.BroadcastCapableChannel;
import org.springframework.integration.dispatcher.AbstractDispatcher;
import org.springframework.integration.dispatcher.BroadcastingDispatcher;
/**
* The {@link AbstractSubscribableAmqpChannel} extension for pub-sub semantics based on the {@link FanoutExchange}.
*
* @author Mark Fisher
* @author Gary Russell
* @author Artem Bilan
*
* @since 2.1
*/
public class PublishSubscribeAmqpChannel extends AbstractSubscribableAmqpChannel {
private volatile FanoutExchange exchange;
public class PublishSubscribeAmqpChannel extends AbstractSubscribableAmqpChannel implements BroadcastCapableChannel {
private final Queue queue = new AnonymousQueue();
private volatile FanoutExchange exchange;
private volatile Binding binding;
/**
@@ -53,6 +56,7 @@ public class PublishSubscribeAmqpChannel extends AbstractSubscribableAmqpChannel
*/
public PublishSubscribeAmqpChannel(String channelName, AbstractMessageListenerContainer container,
AmqpTemplate amqpTemplate) {
super(channelName, container, amqpTemplate, true);
}
@@ -69,6 +73,7 @@ public class PublishSubscribeAmqpChannel extends AbstractSubscribableAmqpChannel
*/
public PublishSubscribeAmqpChannel(String channelName, AbstractMessageListenerContainer container,
AmqpTemplate amqpTemplate, AmqpHeaderMapper outboundMapper, AmqpHeaderMapper inboundMapper) {
super(channelName, container, amqpTemplate, true, outboundMapper, inboundMapper);
}
@@ -104,7 +109,7 @@ public class PublishSubscribeAmqpChannel extends AbstractSubscribableAmqpChannel
@Override
protected AbstractDispatcher createDispatcher() {
BroadcastingDispatcher broadcastingDispatcher = new BroadcastingDispatcher(true);
broadcastingDispatcher.setBeanFactory(this.getBeanFactory());
broadcastingDispatcher.setBeanFactory(getBeanFactory());
return broadcastingDispatcher;
}