There is a case: One part of the solution periodically publishes the data. There are two kind of subscribers. One kind of subscribers want to get the messages while they are published. Second kind of subscribers poll this messages randomly: the subscribers request the the LAST message randomly; they want to get the last input message only;if the last message was not changed since the last poll, the subscribers have to get the same last message (several times) The usual publish-subscribe pattern doesn't ......