StreamSink< S> class 
    A object that accepts stream events both synchronously and asynchronously.
A StreamSink combines the methods from StreamConsumer and EventSink.
The EventSink methods can't be used while the addStream is called. As soon as the addStream's Future completes with a value, the EventSink methods can be used again.
If addStream is called after any of the EventSink methods, it'll be delayed until the underlying system has consumed the data added by the EventSink methods.
When EventSink methods are used, the done Future can be used to catch any errors.
- Implemented types
 - 
          
- EventSink<
S>  - StreamConsumer<
S>  
 - EventSink<
 - Implementers
 
Constructors
Properties
- done → Future
 - 
          Return a future which is completed when the StreamSink is finished. [...]
          read-only
 - hashCode → int
 - 
          The hash code for this object. [...]
          read-only, inherited
 - runtimeType → Type
 - 
          A representation of the runtime type of the object.
          read-only, inherited
 
Methods
- 
          close(
) → Future  - 
          Tells the stream sink that no further streams will be added. [...]
          override
 - 
          add(
S event) → void  - 
          Adds a data 
eventto the sink. [...]inherited - 
          addError(
Object error, [ StackTrace stackTrace ]) → void  - 
          Adds an 
errorto the sink. [...]inherited - 
          addStream(
Stream< S> stream) → Future  - 
          Consumes the elements of 
stream. [...]inherited - 
          noSuchMethod(
Invocation invocation) → dynamic  - 
          Invoked when a non-existent method or property is accessed. [...]
          inherited
 - 
          toString(
) → String  - 
          Returns a string representation of this object.
          inherited
 
Operators
- 
          operator ==(
dynamic other) → bool  - 
          The equality operator. [...]
          inherited