Topic
class implements the MOM topic behavior, basically distributing the received messages to subscribers. A Topic might be part of a hierarchy; if it is the case, and if the topic is not on top of that hierarchy, it will have a father to forward messages to.
A topic might also be part of a cluster; if it is the case, it will have friends to forward messages to.
A topic can be part of a hierarchy and of a cluster at the same time.
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