如何定期发布消息到activemq spring 集成DSL

Question

我安装了 Active MQ 并定期说每 10 秒要发送一条消息到“my.queue”

我正在努力理解 Spring 集成 DSL 语言。

我需要类似的东西

IntegrationFlows.from(every 5 seconds)
 .send(message to "my.queue")

Answer 1

是的，您可以使用 Spring 集成 Java DSL 及其 IntegrationFlow 抽象来做到这一点。要进行周期性任务，您需要在 IntegrationFlows 中使用此工厂来启动流程：

/**
 * Provides {@link Supplier} as source of messages to the integration flow.
 * which will be triggered by a <b>provided</b>
 * {@link org.springframework.integration.endpoint.SourcePollingChannelAdapter}.
 * @param messageSource the {@link Supplier} to populate.
 * @param endpointConfigurer the {@link Consumer} to provide more options for the
 * {@link org.springframework.integration.config.SourcePollingChannelAdapterFactoryBean}.
 * @param <T> the supplier type.
 * @return new {@link IntegrationFlowBuilder}.
 * @see Supplier
 */
public static <T> IntegrationFlowBuilder fromSupplier(Supplier<T> messageSource,
        Consumer<SourcePollingChannelAdapterSpec> endpointConfigurer) {

Supplier 可能 return 一个您想要作为有效负载发送到下游的对象。第二个消费者参数可以配置为：

.poller(p -> p.fixedDelay(1000))

这样，每秒都会根据提供的有效负载创建一条消息并发送到下游。

要向 Active MQ 发送消息，您需要使用 org.springframework.integration.jms.dsl.Jms 及其针对相应通道适配器的方法：

/**
 * The factory to produce a {@link JmsOutboundChannelAdapterSpec}.
 * @param connectionFactory the JMS ConnectionFactory to build on
 * @return the {@link JmsOutboundChannelAdapterSpec} instance
 */
public static JmsOutboundChannelAdapterSpec.JmsOutboundChannelSpecTemplateAware outboundAdapter(
        ConnectionFactory connectionFactory) {

必须在 DSL 回调中使用此工厂的结果，例如：

/**
 * Populate a {@link ServiceActivatingHandler} for the provided
 * {@link MessageHandler} implementation.
 * Can be used as Java 8 Lambda expression:
 * <pre class="code">
 * {@code
 *  .handle(m -> logger.info(m.getPayload())
 * }
 * </pre>
 * @param messageHandler the {@link MessageHandler} to use.
 * @return the current {@link BaseIntegrationFlowDefinition}.
 */
public B handle(MessageHandler messageHandler) {

所有信息都在文档中：https://docs.spring.io/spring-integration/reference/html/dsl.html#java-dsl

像这样：

@Bean
public IntegrationFlow jmsPeriodicFlow() {
    return IntegrationFlows.fromSupplier(() -> "hello", 
                               e -> e.poller(p -> p.fixedDelay(5000)))
            .handle(Jms.outboundAdapter(jmsConnectionFactory())
                    .destination("my.queue"))
            .get();
}

如何定期发布消息到activemq spring 集成DSL

How to periodically publish a message to activemq spring integration DSL

dsl

spring-integration

spring-boot

spring-integration-dsl