code: public <V, A extends Serializable> void addAccumulator(String name, Accumulator<V, A> accumulator) {
  		getRuntimeContext().addAccumulator(id + SEPARATOR + name, accumulator);
  	}
docs: Adds an accumulator by prepending the given name with a random string.
  
  @param name The name of the accumulator
  @param accumulator The accumulator
  @param <V> Type of values that are added to the accumulator
  @param <A> Type of the accumulator result as it will be reported to the client