Description
Without having a separate callback for ExclusivePublications, the users of the Aeron API have to keep a list of registration IDs to identify whether they result from a call toaddPublication() or addExclusivePublication() and call findPublication() or findExclusivePublication() accordingly.
Addition of newExclusivePublicationHandler() breaks existing code if on_new_publication_t handler does not get called for ExclusivePublications. A possible solution could be adding a third call newSynchronizedPublicationHandler() for Publications and deprecating the existing functionality of newPublicationHandler() until a breaking change gets introduced in a later release.
Another possible solution is to make Context detect if newExclusivePublicationHandler() has been set to a non-default handler and wire the calls only in that case.