When the downstream sink is not set, then the sink is considered full otherwise it's full if the downstream sink is full.
When the downstream sink is not set, then the sink is considered full otherwise it's full if the downstream sink is full.
true if the sink is full
If the downstream is not set, then this returns false, otherwise it true.
If the downstream is not set, then this returns false, otherwise it true.
true if the value was added.
Sets a refiller on the sink.
Sets a refiller on the sink. The refiller is executed when the sink is interested in receiving more deliveries.
A sink that allows the downstream sink to set to an optional sink.