code: @Override
      public void prepare(FeatureProvider provider)
      {
          super.prepare(provider);
  
          if (provider instanceof ProducerListener)
          {
              addListener((ProducerListener) provider);
          }
          if (provider instanceof ProducerChecker)
          {
              checker = (ProducerChecker) provider;
          }
      }
docs: /*
  Producer