code: public synchronized CircuitBreaker createCircuitBreaker(String name,
              CircuitBreakerConfig config) {
          CircuitBreaker circuitBreaker = findCircuitBreaker(name);
  
          if (circuitBreaker == null) {
              circuitBreaker = new CircuitBreaker(name);
  
              configureCircuitBreaker(name, circuitBreaker, config);
              addCircuitBreakerToMap(name, circuitBreaker);
          }
  
          return circuitBreaker;
      }
docs: Create a new {@link CircuitBreaker} and map it to the provided name.
  If the CircuitBreaker already exists, then the existing instance is
  returned.
  @param name the name of the {@link CircuitBreaker}
  @param config the {@link CircuitBreakerConfig} with the configuration
  values.
  @return the created {@link CircuitBreaker}