Preface

springcloud is a master of micro-service architecture, a series of excellent components were integrated. springboot build on our familiar spring programmers based, relatively easy to get started.

With a few simple annotations, we can quickly look at commonly used in the application configuration module and build large distributed systems.

FIG mainly used below to understand the concept of the individual components of it

Which components have outstanding

Eureka

Function: service registration and discovery, when each service starts, Eureka Client service will be registered with the Eureka Server, and Eureka Client can also turn to take the registry from Eureka Server pull, so they know where other services

Ribbon

Function: Service calls requesting client load balancing, time between service initiated the request, based on the Ribbon to do load balancing, multiple machines from a service, select a

Feign

Function: Service call request, based on a dynamic proxy mechanism Feign, according to the notes and selected machine, stitching request URL address and send a request

Hystrix

Function: Fuse, initiates a request by Hystrix thread pool to go, different services take a different thread pool to achieve the isolation of different service calls, to avoid the avalanche of service issues

Zuul

Function: api routing gateway, if the front-end, back-end system to call the mobile terminal, the gateway into the Unified from Zuul, forwarded by Zuul gateway request to the corresponding service

Sleuth

Function: link tracking service, the main function is to provide tracking solutions in distributed systems, and is compatible support zipkin

Spring Cloud core components: Eureka service registration and discovery

He has composed three-terminal

1.Eureka Server service registration and discovery center end

2.Service Provider service provider side

3.Service Consumer Services callers end

Official figure

Spring Cloud core components: Feign

Interface calls, restful style http java interface mode can be used to call the tune.

Assemble their own url and parameters as well as first-class information request, you do not have to go write it. Easy to use.

Look to the code is called

//url=http://www.me.com@FeignClient(url = "${feign.order-promotion.url}")
public interface PromotionClient {
    @RequestMapping(value = "/Member/Promotion/ReleasePromtionByOrderId", method = RequestMethod.POST)
    BaseWcfResponse<Integer> ReleasePromtionByOrderId(@RequestBody ReleasePromtionReq request);
}