public void execute()

in clients/service-center-client/src/main/java/org/apache/servicecomb/service/center/client/ServiceCenterRegistration.java [127:187]
59 lines of code
9 McCabe index (conditional complexity)

    public void execute() {
      try {
        RegisteredMicroserviceResponse serviceResponse = serviceCenterClient.queryServiceId(microservice);
        if (serviceResponse == null) {
          RegisteredMicroserviceResponse response = serviceCenterClient.registerMicroservice(microservice);
          if (StringUtils.isEmpty(response.getServiceId())) {
            LOGGER.error("register microservice failed, and will try again.");
            eventBus.post(new MicroserviceRegistrationEvent(false, microservice));
            startTask(new BackOffSleepTask(failedCount + 1, new RegisterMicroserviceTask(failedCount + 1)));
            return;
          }
          microservice.setServiceId(response.getServiceId());
          microserviceInstance.setServiceId(response.getServiceId());
          microserviceInstance.setMicroservice(microservice);
          eventBus.post(new MicroserviceRegistrationEvent(true, microservice));
          startTask(new RegisterSchemaTask(0));
        } else {
          Microservice newMicroservice = serviceCenterClient.getMicroserviceByServiceId(serviceResponse.getServiceId());

          Map<String, String> propertiesTemp = microservice.getProperties();
          microservice.setProperties(newMicroservice.getProperties());
          microservice.getProperties().putAll(propertiesTemp);
          if (serviceCenterClient.updateMicroserviceProperties(serviceResponse.getServiceId(),
              microservice.getProperties())) {
            LOGGER.info(
                "microservice is already registered. Update microservice properties successfully. properties=[{}]",
                microservice.getProperties());
          } else {
            LOGGER.error("microservice is already registered. Update microservice properties failed. properties=[{}]",
                microservice.getProperties());
          }

          microservice.setServiceId(serviceResponse.getServiceId());
          microserviceInstance.setServiceId(serviceResponse.getServiceId());
          microserviceInstance.setMicroservice(microservice);
          if (isSwaggerDifferent(newMicroservice)) {
            if (serviceCenterConfiguration.isCanOverwriteSwagger()) {
              LOGGER.warn("Service has already registered, but schema ids not equal, try to register it again");
              eventBus.post(new MicroserviceRegistrationEvent(true, microservice));
              startTask(new RegisterSchemaTask(0));
              return;
            }
            if (serviceCenterConfiguration.isIgnoreSwaggerDifferent()) {
              LOGGER.warn("Service has already registered, but schema ids not equal. Ignore and continue to register");
            } else {
              throw new IllegalStateException(
                  "Service has already registered, but schema ids not equal, stop register. "
                      + "Change the microservice version or delete the old microservice info and try again.");
            }
          }
          eventBus.post(new MicroserviceRegistrationEvent(true, microservice));
          startTask(new RegisterMicroserviceInstanceTask(0));
        }
      } catch (IllegalStateException e) {
        throw e;
      } catch (Exception e) {
        LOGGER.error("register microservice failed, and will try again.", e);
        eventBus.post(new MicroserviceRegistrationEvent(false, microservice));
        startTask(new BackOffSleepTask(failedCount + 1, new RegisterMicroserviceTask(failedCount + 1)));
      }
    }