public List<Integer> emit(String streamId,Tuple anchor,List<Object> tuple){
  return emit(streamId,Arrays.asList(anchor),tuple);
}

public List < Integer > emit ( String streamId , Tuple anchor , List < Object > tuple ) { return emit ( streamId , Arrays . asList ( anchor ) , tuple ) ; }
emits a new tuple to a specific stream with a single anchor . the emitted values must be immutable .
