E- topic event type
public interface ReliableMessageListener<E> extends MessageListener<E>
MessageListenerto better integrate with the reliable topic.
If a regular MessageListener is registered on a reliable topic, the message listener works fine, but it can't do much more than listen to messages.
If a ReliableMessageListener is registered on a normal topic, only the
MessageListener methods will be called.
isTerminal(Throwable)method. If a plain MessageListener is used, then it won't terminate on exceptions and it will keep on running. But in some cases it is better to stop running.
retrieveInitialSequence()returns the stored sequence, then an at-least-once delivery is implemented since the same item is now being processed twice. To implement an at-most-once delivery guarantee, add 1 to the stored sequence when the
|Modifier and Type||Method and Description|
Checks if this ReliableMessageListener is able to deal with message loss.
Checks if the ReliableMessageListener should be terminated based on an exception thrown while calling
Retrieves the initial sequence from which this ReliableMessageListener should start.
Informs the ReliableMessageListener that it should store the sequence.
-1 if there is no initial sequence and you want to start
from the next published message.
If you intend to create a durable subscriber so you continue from where you stopped the previous time, load the previous sequence and add 1. If you don't add one, then you will be receiving the same message twice.
void storeSequence(long sequence)
sequence- the sequence
If the ReliableMessageListener is not loss tolerant and the topic detects that there are missing messages, it will terminate the ReliableMessageListener.
trueif the ReliableMessageListener is tolerant towards losing messages.
boolean isTerminal(Throwable failure)
failure- the exception thrown while calling
trueif the ReliableMessageListener should terminate itself,
falseif it should keep on running.
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