xplayer9 / microservice

Spring Microservices using Spring Cloud

SpringBoot Microservices -- Stock Price Services (Real Time Quoto and Historical Price)

Technology

• SpringBoot Architecture
• Spring API Gateway
• Configuration Server
• Eureka Serivce Discovery Server
• Kafka Message Queue
• Spring Cloud Security JWT
• Resilience4J Circuit Braker
• DataBase: JPA, PostgreSQL
• Development tools: Dev package, Lombok, Docker, Actuator
• Frontend library: Thymeleaf, Webjar

High Level System Architecture

High Level Cloud Security Flow

Spring Cloud Components

Eureka Serivce Discovery Server

• Purpose: Eureka Server holds the information about all client-service applications. Every Micro service will register into the Eureka server
• Key Dependency: Web, Eureka Server
• application.properties

server.port = 8761
eureka.client.registerWithEureka = false //do not register eureka self
eureka.client.fetchRegistry = false      //do not register eureka self

Configuration Server

• Purpose: Spring Cloud Configuration server provides unified configuration settings in a distributed system

• You can save configuration file on Web(Ex:Git repo) or local storage

• Key Dependency: Web, Config Server

• application.properties

server.port = 8888
spring.cloud.config.server.git.uri = https://github.com/xplayer9/config-repo
spring.cloud.config.server.git.default-label = main   //Code branch name in Git

• "application.yml" in Git repo

my:
  greeting: This is greeting
  cookieName: cookieJWT
  secretKey: mysecrect
  keyDuration: 3600
  header:
    type: Authorization
  kafkatopic: json_topic
  kafkauri: localhost:9092

spring:
  datasource:
    url: jdbc:postgresql://localhost:1234/postgres
    username: postgres
    password: 1234
  jpa:
    show-sql: true
    hibernate:
      ddl-auto: update
    properties:
      hibernate:
        dialect: org.hibernate.dialect.PostgreSQLDialect

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka
  instance:
    hostname: localhost
    preferIpAddress: false

management:
  endpoints:
    web:
      exposure:
        include: "*"
  endpoint:
    health:
      show-details: always

resilience4j.circuitbreaker:
  instances:
    processService:
      slidingWindowSize: 5
      permittedNumberOfCallsInHalfOpenState: 1
      slidingWindowType: COUNT_BASED
      minimumNumberOfCalls: 10
      waitDurationInOpenState: 3s
      slowCallDurationThreshold: 2s
      failureRateThreshold: 20
      slowCallRateThreshold: 20

Gateway Server

• Purpose: provides a flexible way of routing requests
• Key Dependency: Web, WebFlux, Gateway, Eureka Client
• Support GatewayFilter and GolbalFilter
• "application.yml"

server:
  port: 8080
  
spring:
  application:
    name: gateway
  cloud:
    config:
      uri: http://localhost:8888
    gateway:
      discovery:
        locator:
          enabled: true
      routes:
        - id: USERAPI
          uri: lb://USERAPI
          predicates:
            - Path=/user/**
          filters:
            - StripPrefix=1
        - id: TRADEAPI
          uri: lb://TRADEAPI
          predicates:
            - Path=/trade/**
          filters:
            - StripPrefix=1
        - id: STOCKAPI
          uri: lb://STOCKAPI
          predicates:
            - Path=/stock/**
          filters:
            - StripPrefix=1
        - id: DBAPI
          uri: lb://DBAPI
          predicates:
            - Path=/db/**
          filters:
            - StripPrefix=1

Actuator, Devtools, Lombok, Gson

• Dependency

<dependency>
	<groupId>org.springframework.boot</groupId>    
	<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-devtools</artifactId>
	<optional>true</optional>
</dependency>
<dependency>
	<groupId>org.projectlombok</groupId>
	<artifactId>lombok</artifactId>
	<optional>true</optional>
</dependency>
<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
</dependency>

Microservice Component APIs: UserApi

• Purpose: To Authenticate and Authorize every incoming request, manage user account
• Key Dependency: Web, Cloud, JPA, Config client, Eureka client, Lombok, jjwt, jaxb

Microservice Component APIs: StockApi

• Purpose: To Handle stock info, web request for real time stock price and historical price
• Utlize UserApi for JWT Authentication and Authorization
• Key Dependency: Web, Cloud, Config client, Eureka client, Lombok

Microservice Component APIs: TradeApi

• Purpose: To perform stock trading exercise
• Utlize UserApi for JWT Authentication and Authorization
• Key Dependency: Web, Cloud, Config client, Eureka client, Lombok

Microservice Component APIs: DBApi

• Purpose: To handle all database access operations
• Utlize UserApi for JWT Authentication and Authorization
• Key Dependency: Web, Cloud, JPA, Config client, Eureka client, Lombok

Functional Flow Diagram

Demo Page -- Real Time Stock Quote

Demo Page -- Historical Stock Price