Package org.springframework.integration.util

Class IntegrationReactiveUtils

java.lang.Object
org.springframework.integration.util.IntegrationReactiveUtils
public final class IntegrationReactiveUtils
extends java.lang.Object
Utilities for adapting integration components to/from reactive types.
Since:
5.3

  • Field Summary

    Fields 
    Modifier and Type Field Description
    static java.time.Duration DEFAULT_DELAY_WHEN_EMPTY
    A default delay before repeating an empty source Mono as 1 second Duration.
    static java.lang.String DELAY_WHEN_EMPTY_KEY
    The subscriber context entry for Flux.delayElements(java.time.Duration) from the Mono.repeatWhenEmpty(java.util.function.Function).

  • Method Summary

    Modifier and Type Method Description
    static <T> reactor.core.publisher.Flux<org.springframework.messaging.Message<T>> messageChannelToFlux​(org.springframework.messaging.MessageChannel messageChannel)
    Adapt a provided MessageChannel into a Flux source: - a FluxMessageChannel is returned as is because it is already a Publisher; - a SubscribableChannel is subscribed with a MessageHandler for the Sinks.Many.tryEmitNext(Object) which is returned from this method; - a PollableChannel is wrapped into a MessageSource lambda and reuses messageSourceToFlux(MessageSource).
    static <T> reactor.core.publisher.Flux<org.springframework.messaging.Message<T>> messageSourceToFlux​(MessageSource<T> messageSource)
    Wrap a provided MessageSource into a Flux for pulling the on demand.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • DELAY_WHEN_EMPTY_KEY

      public static final java.lang.String DELAY_WHEN_EMPTY_KEY
      The subscriber context entry for Flux.delayElements(java.time.Duration) from the Mono.repeatWhenEmpty(java.util.function.Function).
      See Also:
      Constant Field Values

    • DEFAULT_DELAY_WHEN_EMPTY

      public static final java.time.Duration DEFAULT_DELAY_WHEN_EMPTY
      A default delay before repeating an empty source Mono as 1 second Duration.

  • Method Details

    • messageSourceToFlux

      public static <T> reactor.core.publisher.Flux<org.springframework.messaging.Message<T>> messageSourceToFlux​(MessageSource<T> messageSource)
      Wrap a provided MessageSource into a Flux for pulling the on demand. When MessageSource.receive() returns null, the source Mono goes to the Mono.repeatWhenEmpty(java.util.function.Function<reactor.core.publisher.Flux<java.lang.Long>, ? extends org.reactivestreams.Publisher<?>>) state and performs a delay based on the DELAY_WHEN_EMPTY_KEY Duration entry in the subscriber context or falls back to 1 second duration. If a produced message has an IntegrationMessageHeaderAccessor.ACKNOWLEDGMENT_CALLBACK header it is ack'ed in the Mono.doOnSuccess(java.util.function.Consumer<? super T>) and nack'ed in the Mono.doOnError(java.util.function.Consumer<? super java.lang.Throwable>).
      Type Parameters:
      T - the expected payload type.
      Parameters:
      messageSource - the MessageSource to adapt.
      Returns:
      a Flux which pulls messages from the MessageSource on demand.

    • messageChannelToFlux

      public static <T> reactor.core.publisher.Flux<org.springframework.messaging.Message<T>> messageChannelToFlux​(org.springframework.messaging.MessageChannel messageChannel)
      Adapt a provided MessageChannel into a Flux source: - a FluxMessageChannel is returned as is because it is already a Publisher; - a SubscribableChannel is subscribed with a MessageHandler for the Sinks.Many.tryEmitNext(Object) which is returned from this method; - a PollableChannel is wrapped into a MessageSource lambda and reuses messageSourceToFlux(MessageSource).
      Type Parameters:
      T - the expected payload type.
      Parameters:
      messageChannel - the MessageChannel to adapt.
      Returns:
      a Flux which uses a provided MessageChannel as a source for events to publish.