===== Topic =====

[[Topic]] is the base interface used to define synchronous Message Broker topics. It is used by the [[IMessageBroker]] to constrain a broadcast to the synchronous messaging flow and to bind the Topic to the type of [[BaseMessage]] it carries.

Topics implement ''Topic<T>'', where T specifies the message payload accepted by that Topic and must derive from [[BaseMessage]]. This association ensures that subscriptions and broadcasts for a Topic use the corresponding message type.

A Topic is intended to represent a specific event or notification within the application. Subscribers register an [[EventCallback]] for a Topic and a specific broadcaster, and the [[IMessageBroker]] invokes those callbacks when that broadcaster synchronously broadcasts the Topic.

=== Type Parameters ===
^Type Parameter | T |
^Description | The [[BaseMessage]] type associated with the Topic. This determines the payload type that can be supplied when subscribing to or broadcasting the Topic. |