Creates a SinkTIn, TMat that receives elements from its upstream producer and broadcasts them to a dynamic set of consumers. After the SinkTIn, TMat returned by this method is materialized, it returns a SourceTOut, TMat as materialized value. This SourceTOut, TMat can be materialized arbitrary many times and each materialization will receive the broadcast elements from the original SinkTIn, TMat. Every new materialization of the SinkTIn, TMat results in a new, independent hub, which materializes to its own SourceTOut, TMat for consuming the SinkTIn, TMat of that materialization. If the original SinkTIn, TMat is failed, then the failure is immediately propagated to all of its materialized SourceTOut, TMats (possibly jumping over already buffered elements). If the original SinkTIn, TMat is completed, then all corresponding SourceTOut, TMats are completed. Both failure and normal completion is "remembered" and later materializations of the SourceTOut, TMat will see the same (failure or completion) state. SourceTOut, TMats that are cancelled are simply removed from the dynamic set of consumers.

Creates a SinkTIn, TMat that receives elements from its upstream producer and broadcasts them to a dynamic set of consumers. After the SinkTIn, TMat returned by this method is materialized, it returns a SourceTOut, TMat as materialized value. This SourceTOut, TMat can be materialized arbitrary many times and each materialization will receive the broadcast elements form the original SinkTIn, TMat. Every new materialization of the SinkTIn, TMat results in a new, independent hub, which materializes to its own SourceTOut, TMat for consuming the SinkTIn, TMat of that materialization. If the original SinkTIn, TMat is failed, then the failure is immediately propagated to all of its materialized SourceTOut, TMats (possibly jumping over already buffered elements). If the original SinkTIn, TMat is completed, then all corresponding SourceTOut, TMats are completed. Both failure and normal completion is "remembered" and later materializations of the SourceTOut, TMat will see the same (failure or completion) state. SourceTOut, TMats that are cancelled are simply removed from the dynamic set of consumers.