Spring Cloud

Spring Cloud - Spring Cloud Netflix

• Registry and Discovery - Eureka

  • Depending on the spring-cloud-starter-eureka-server
  • add @EnableEurekaServer to enable the server
  • add @EnableDiscoveryClient to enable Eureka client
  • create more than one Eureka servers and register each others and enable high availability.
  • in the client side, it's required to add more than one registry server url in the eureka.client.serviceUrl.defaultZone
  • https://www.jianshu.com/p/12a70993e321
  • alterative: https://nacos.io/en-us/docs/quick-start-spring-cloud.html

• Consumption - Robbin

  • use Ribbon - https://www.baeldung.com/spring-cloud-rest-client-with-netflix-ribbon
  • need to add the dependency spring-cloud-starter-ribbon
  • RestTemplate
  • restTemplate.getForEntity, return ResponseEntity

• Spring Cloud Hystrix

  • implement the circuit breaker
  • add spring-cloud-starter-hystrix
  • add @EnableCircuitBreaker to Application Class
  • add @@HystrixCommand to the method and define the fallbackMethod for handling the circuit break
  • add cache ← need more study
  • add batch call - HystrixCollapser ← need more study

• Spring Cloud Feign

  • encapsulated the RestTemplate and just use the service
  • need to define the feign client interface by adding @FeignClient and then specify the service name
  • it is able to define the fallback method in the class level by applying the fallback = “{class}”

• Spring Cloud Zuul

  • define url mapping in the application properties
  • zuul.routes.api-a.path=/api-a/{}{}
  • zuul.routes.api-a.serviceId=hello-service
  • zuul.routes.api-a-url.path=/api-a-url/{}{}
  • zuul.routes.api-a-url.url=http://localhost:8080/
  • can define filter to pre-processing
  • extends ZuulFilter
  • https://www.cnblogs.com/hyhnet/p/8097641.html

• Spring Bus

  • use rabbitMQ
  • define connection in application properties
  • create Queue bean in @Configuration
  • use AmqpTemplate to send the message to the queue
  • template.convertAndSend(“hello”,“message”)
  • send to hello queue

Resources

Handle Security in Zuul, with OAuth2 and JWT

https://www.baeldung.com/spring-security-zuul-oauth-jwt

Spring Cloud下基于OAUTH2认证授权的实现

https://github.com/wiselyman/uaa-zuul