sends the result of the future downstream . concode_field_sep PlaceHolder placeHolder concode_field_sep Downstream<T> onError concode_elem_sep void success concode_elem_sep Downstream<T> onComplete concode_elem_sep void error concode_elem_sep void complete concode_elem_sep Downstream<O> onSuccess
void function ( CompletableFuture < ? extends T > arg0 ) { arg0 . handle ( ( value , failure ) -> { if ( failure == null ) { success ( value ) ; } else { error ( failure ) ; } return null ; } ) ; }