Java Microservices

Java 8, Spring Boot, Hibernate, PostgreSQL

• Store configuration details on cloud using CloudConfig.
• Load balance requests between microservices using Ribbon.
• Discover services in cloud using Eureka.
  • Ribbon with Eureka.
• Increase resilience through Hystrix
  • Circuit Breaker pattern, Fail Silent approach.
• Use asynchronous communication to improve performance.
  • hystrix-javanica: Asynchronous Execution.
• Create a API gateway using Zuul.
  • Zuul and Ribbon.
  • Zuul and Hystrix.
  • Cookies and Sensitive Headers.
    official reference
• Simplify REST calls through Feign.
  Implemented only to get restaurant-ms. RestTemplate is still used to get customer-ms.
• Monitor microservices through Turbine, Sleuth and Zipkin.
  • Zipkin (docker run -d -p 9411:9411 openzipkin/zipkin).
    https://github.com/openzipkin/zipkin.
• Secure Config.
  • Spring Basic Authentication Securing Cloud Config Server.
  • Encrypt the sensitive values using Postman(Basic Auth and the value to encrypt), you need the key in the cloud-config-server.
    • disable CSRF in cloud-config-server to /encrypt & /decrypt
    • spring-cloud/spring-cloud-config#934 (comment)

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External to ms_technology_1

CloudConfig

• ms-config
• github-spring-cloud-config-server

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Inside ms_technology_1

Services

• eureka-server
• zuul-server

Microservices

• order-ms
• restaurant-ms
• customer-ms

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resturant (id, restaurantName, restaurantLocation)
customer (id, customerName, customerLocation)
order (id, orderNumber, restaurantId, customerId, createdAt)

A customer -> places an order -> to a restaurant

Suppose you are a driver and this is what you received to deliver an order to a client:

{
    "id": "101001",
    "orderNumber": "Ord-Nro-1",
    "createdAt": "2020-03-29T01:30:19.396+0000",
    "customer": {
        "id": "101302",
        "customerName": "Dan Jav",
        "customerLocation": "345 Beautiful Rd, Mercerville, NJ"
    },
    "restaurant": {
        "id": "1102",
        "restaurantName": "Sabor Cubano",
        "restaurantLocation": "12 Beautiful Rd, Mercerville, NJ"
    }
}

Basically you need to go to the restaurant location, pick up the order number and deliver it to the customer location