code: public EvaluatorContext newContext(final String contextId, final Optional<String> parentID) {
      synchronized (this.priorIds) {
        if (this.priorIds.contains(contextId)) {
          throw new IllegalStateException("Creating second EvaluatorContext instance for id " + contextId);
        }
        this.priorIds.add(contextId);
      }
      return new EvaluatorContext(contextId,
          this.evaluatorId,
          this.evaluatorDescriptor,
          parentID,
          this.configurationSerializer,
          this.contextControlHandler,
          this.messageDispatcher,
          this.exceptionCodec,
          this.contextRepresenters.get());
    }
docs: Instantiate a new Context representer with the given id and parent id.
  
  @param contextId
  @param parentID
  @return a new Context representer with the given id and parent id.