E - message type
@FunctionalInterface public interface MessageListener<E> extends EventListener
A MessageListener will never be called concurrently (provided that it's not registered twice). So there is no need to synchronize access to the state it reads or writes. Also there is no need to synchronize when publishing to the ITopic, the ITopic is responsible for memory consistency effects. In other words, there is no need to make fields of the MessageListener volatile or access them using synchronized blocks.
message - the message that is received for the topic
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