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Microservices Communication using RestTemplate, WebClient and Cloud OpenFeign

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Pragya Keshap answered on February 10, 2023 Popularity 1/10 Helpfulness 1/10

answer Microservices Communication using RestTemplate, WebClient and Cloud OpenFeign

Microservices Communication using RestTemplate, WebClient and Cloud OpenFeign

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WebClient (RestTemplate - deprecated to support WebClient)

Supports reactive call

underlying HTTP client libraries such as Reactor Netty

Part of spring framework - WebFlux || Doc will give you more

Comes in 2 flavour - Annotation and functional way

Personally I found it very useful while working with OAuth2 creating bean webClient, before making call it needs to be authenticated with token, ServerOAuth2AuthorizedClientExchangeFilterFunction will ease each call with just one time configuration

OpenFeign

Reactive - need to use 3rd party - com.playtika.reactivefeign

Fits best if you want call in blocking way

Part of Spring cloud

Netflix fully transferred Feign to the open-source community under a new project named OpenFeign

@Service
@AllArgsConstructor
public class EmployeeServiceImpl implements EmployeeService {

    private static final Logger LOGGER = LoggerFactory.getLogger(EmployeeServiceImpl.class);

    private EmployeeRepository employeeRepository;

   // private RestTemplate restTemplate;
    private WebClient webClient;
    private APIClient apiClient;

    @Override
    public EmployeeDto saveEmployee(EmployeeDto employeeDto) {

        Employee employee = EmployeeMapper.mapToEmployee(employeeDto);

        Employee saveDEmployee = employeeRepository.save(employee);

        EmployeeDto savedEmployeeDto = EmployeeMapper.mapToEmployeeDto(saveDEmployee);

        return savedEmployeeDto;
    }

    //@CircuitBreaker(name = "${spring.application.name}", fallbackMethod = "getDefaultDepartment")
    @Retry(name = "${spring.application.name}", fallbackMethod = "getDefaultDepartment")
    @Override
    public APIResponseDto getEmployeeById(Long employeeId) {

        LOGGER.info("inside getEmployeeById() method");
        Employee employee = employeeRepository.findById(employeeId).get();

//        ResponseEntity<DepartmentDto> responseEntity = restTemplate.getForEntity("http://DEPARTMENT-SERVICE/api/departments/" + employee.getDepartmentCode(),
//                DepartmentDto.class);
//
//        DepartmentDto departmentDto = responseEntity.getBody();

        DepartmentDto departmentDto = webClient.get()
                .uri("http://localhost:8080/api/departments/" + employee.getDepartmentCode())
                .retrieve()
                .bodyToMono(DepartmentDto.class)
                .block();

      //  DepartmentDto departmentDto = apiClient.getDepartment(employee.getDepartmentCode());

        OrganizationDto organizationDto = webClient.get()
                .uri("http://localhost:8083/api/organizations/" + employee.getOrganizationCode())
                .retrieve()
                .bodyToMono(OrganizationDto.class)
                .block();

        EmployeeDto employeeDto = EmployeeMapper.mapToEmployeeDto(employee);

        APIResponseDto apiResponseDto = new APIResponseDto();
        apiResponseDto.setEmployee(employeeDto);
        apiResponseDto.setDepartment(departmentDto);
        apiResponseDto.setOrganization(organizationDto);
        return apiResponseDto;
    }

https://stackoverflow.com/questions/65063361/communication-between-microservices-spring-cloud-openfeign-vs-webclient-resttem

Popularity 1/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: cloud communication java microservices openfeign using web-client

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Contributed on Feb 10 2023

Pragya Keshap

0 Answers Avg Quality 2/10

Microservices Communication using RestTemplate, WebClient and Cloud OpenFeign

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