接口 ChannelInterceptor

方法详细资料

• preSend

  @Nullable
  default Message<?> preSend​(Message<?> message,
                             MessageChannel channel)

  Invoked before the Message is actually sent to the channel. This allows for modification of the Message if necessary. If this method returns null then the actual send invocation will not occur.

• postSend

  default void postSend​(Message<?> message,
                        MessageChannel channel,
                        boolean sent)

  Invoked immediately after the send invocation. The boolean value argument represents the return value of that invocation.

• afterSendCompletion

  default void afterSendCompletion​(Message<?> message,
                                   MessageChannel channel,
                                   boolean sent,
                                   @Nullable
                                   Exception ex)

  Invoked after the completion of a send regardless of any exception that have been raised thus allowing for proper resource cleanup.

  Note that this will be invoked only if preSend(org.springframework.messaging.Message<?>, org.springframework.messaging.MessageChannel) successfully completed and returned a Message, i.e. it did not return null.

  从以下版本开始:

  4.1

• preReceive

  default boolean preReceive​(MessageChannel channel)

  Invoked as soon as receive is called and before a Message is actually retrieved. If the return value is 'false', then no Message will be retrieved. This only applies to PollableChannels.

• postReceive

  @Nullable
  default Message<?> postReceive​(Message<?> message,
                                 MessageChannel channel)

  Invoked immediately after a Message has been retrieved but before it is returned to the caller. The Message may be modified if necessary; null aborts further interceptor invocations. This only applies to PollableChannels.

• afterReceiveCompletion

  default void afterReceiveCompletion​(@Nullable
                                      Message<?> message,
                                      MessageChannel channel,
                                      @Nullable
                                      Exception ex)

  Invoked after the completion of a receive regardless of any exception that have been raised thus allowing for proper resource cleanup.

  Note that this will be invoked only if preReceive(org.springframework.messaging.MessageChannel) successfully completed and returned true.

  从以下版本开始:

  4.1