Scalable Microservices With Spring Cloud

Tech Stack

Server: Spring-Boot embeded Tomcat Server, Spring-Boot-REST-API

Client: Postman, Browser

Database: MySQL,JPA, Hibernate

Service Discovery: Spring Cloud relies on services like Eureka Server to help register and locate microservices within the application.

Configuration Management: It integrates with Spring Cloud Config Server for centralized configuration management. Individual microservices use the Spring Cloud Config Client to fetch their configurations.

Routing: Tools like Spring Cloud Gateway can be used to provide a single entry point for API requests and route them to appropriate microservices.

Resilience: Libraries like resilience4j can be used to implement features like circuit breakers and fault tolerance for handling service failures gracefully.

Other functionalities: Spring Cloud offers various other tools for distributed messaging, task execution, and monitoring in a microservices architecture.

Spring-Cloud-Architechture

API-Gateway architechture

Microservices-Communication

Service-Discovery-using-Netflix-Eureka-Server

Config-Server manual refresh

Config-Server auto refresh

Rabbitmq integration with spring cloud bus -

### INSTALL rabbitmq
* pull rabbitmq docker image
  *  docker pull rabbitmq:3.11.0
  *  docker run --rm  -it -p 5672:5672 rabbitmq:3.11.0

Add amqp dependency inside pom.xml

		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-bus-amqp</artifactId>
		</dependency>

Running Zipkin -> Distributed tracing

Pull zipkin docker image

docker pull openzipkin/zipkin

Run zipkin container

docker run -d -p 9411:9411 openzipkin/zipkin

Centralized Config server repository

Circuit-Breaker-Pattern

Service-Host

employee-service -> http://localhost:9090

department-service -> http://localhost:8080

api-gate-way -> http://localhost:2000

config-server -> http://localhost:3000

service-discovery-> http://localhost:8761

API Reference

Get all items

  GET /api/items

Parameter	Type	Description
api_key	string	Required. Your API key

Get item

  GET /api/items/${id}

Parameter	Type	Description
id	string	Required. Id of item to fetch

add(num1, num2)

Takes two numbers and returns the sum.