Free queue channel in spring integration with java DSL

Question

i have a channel that stores messages. When new messages arrive, if the server has not yet processed all the messages (that still in the queue), i need to clear the queue (for e

Answer 1

I would suggest you to take a look into a purge API of the QueueChannel:

/**
 * Remove any {@link Message Messages} that are not accepted by the provided selector.
 * @param selector The message selector.
 * @return The list of messages that were purged.
 */
List<Message<?>> purge(@Nullable MessageSelector selector);

This way with a custom MessageSelector you will be able to remove from the queue old messages. See a timestamp message header to consult. With the result of this method you can do whatever you need to do with old messages.