• Spring Cloud Gateway • Eureka Discovery • Open Feign Rest Client • Hystrix DashBoard

Table of contents

Customer Service

• Spring Web • Spring Data JPA • H2 Database• Rest Repositories • Lombok• Spring Boot DevTools• Eureka Discovery Client• Spring Boot Actuator

spring.application.name=customer-servicespring.datasource.url=jdbc:h2:mem:customers-dbspring.cloud.discovery.enabled=true#management.endpoints.web.exposure.include=*server.port=8888

Steps :

1. CreateCustomer entity

packagema.enset.customermicroservice.entites;importjakarta.persistence.Entity;importjakarta.persistence.GeneratedValue;importjakarta.persistence.GenerationType;importjakarta.persistence.Id;importlombok.AllArgsConstructor;importlombok.Data;importlombok.NoArgsConstructor;importlombok.ToString;@Entity@Data@NoArgsConstructor@AllArgsConstructor@ToStringpublicclassCustomer {@Id@GeneratedValue(strategy =GenerationType.IDENTITY)privateLongid;privateStringname;privateStringemail;}

2. CreateCustomerRepository Spring Data based interface

packagema.enset.customermicroservice.repository;importma.enset.customermicroservice.entites.Customer;importorg.springframework.data.jpa.repository.JpaRepository;importorg.springframework.data.rest.core.annotation.RepositoryRestResource;@RepositoryRestResourcepublicinterfaceCustomerRepositoryextendsJpaRepository<Customer,Long> {}

3. Deploy Restful API of microservice with Spring Data Rest

4. Microservice test

Inventory Service

spring.application.name=inventory-servicespring.datasource.url=jdbc:h2:mem:products-dbspring.cloud.discovery.enabled=trueserver.port=8889

Steps :

Gateway Service

• Gateway • Spring Boot Actuator• Hystrix • Eureka Discovery Client

1. Static routes configuration : application.yml / application.properties

spring.application.name=gateway-servicespring.cloud.discovery.enabled=trueserver.port=8890

spring:cloud:gateway:routes:        -id :r1uri :http://localhost:8888/predicates :            -Path= /customers/**        -id :r2uri :http://localhost:8889/predicates :            -Path= /products/**

2. Static routes configuration : Java Config Class

@BeanRouteLocatorrouteLocator(RouteLocatorBuilderbuilder){returnbuilder.routes()                .route("r1", (r) ->r.path("/customers/**").uri("http://localhost:8888/"))                .route("r2", (r) ->r.path("/products/**").uri("http://localhost:8889/"))                .build();    }

3. Eureka Discovery Service : Dynamic Routing

Eureka Discovery Service

• Eureka Server

@SpringBootApplication@EnableEurekaServerpublicclassEurekaDiscoveryApplication {publicstaticvoidmain(String[]args) {SpringApplication.run(EurekaDiscoveryApplication.class,args);    }}

server.port=8761#dontregisterserveritselfasaclient.eureka.client.fetch-registry=false#Doesnotregisteritselfintheserviceregistry.eureka.client.register-with-eureka=false

@BeanRouteLocatorrouteLocator(RouteLocatorBuilderbuilder){returnbuilder.routes()                .route("r1", (r) ->r.path("/customers/**").uri("lb://CUSTOMER-SERVICE"))                .route("r2", (r) ->r.path("/products/**").uri("lb://INVENTORY-SERVICE"))                .build();    }

@BeanDiscoveryClientRouteDefinitionLocatordefinitionLocator(ReactiveDiscoveryClientrdc,DiscoveryLocatorPropertiesdlp){returnnewDiscoveryClientRouteDefinitionLocator(rdc,dlp);    }

Billing Service

• OpenFeign • Spring HATEOAS

II - Front End Part with Angular :