Spring Cloud Microservices Tutorial Series

In this tutorial series, we will talk about the following topics that are used to develop microservices with Spring Cloud:

• Service Discovery
• Request routing
• Service-to-service calls
• Load balancing
• Distributed Tracing
• Circuit Breaker pattern
• Retrying service-to-service calls

We will develop 3 microservices to list users, list user orders, view order details etc:

User Service: Used to retrieve user details along with their orders. A sample user record looks like the following:

{
  "id": 1,
  "name": "Joe",
  "orders": [
    {
      "id": 11,
      "userId": 1,
      "price": 1250,
      "orderTime": "2022-10-11T11:41:44.085868100Z"
    },
    {
      "id": 10,
      "userId": 1,
      "price": 100,
      "orderTime": "2022-10-11T11:41:44.085868100Z"
    }
  ]
}

Order Service: Used to retrieve previous orders of users. Order Service internally calls Product Service to get the product details for the purchased items. Order details for a specific order look like the following:

[
  {
    "id": 100,
    "orderId": 10,
    "productId": 1000,
    "product": {
      "id": 1000,
      "name": "pencil",
      "quantity": 500
    },
    "quantity": 3,
    "unitPrice": 0.7
  },
  {
    "id": 101,
    "orderId": 10,
    "productId": 1001,
    "product": {
      "id": 1001,
      "name": "book",
      "quantity": 100
    },
    "quantity": 1,
    "unitPrice": 8
  }
]

Product Service: Used to retrieve product details. A sample product record looks like the following:

{
  "id": 1000,
  "name": "pencil",
  "quantity": 500,
  "unitPrice": 0.7
}

Below are the list of tutorials in this series:

Part 1 — Service Discovery with Netflix Eureka

Part 2 — Integrating API Gateway

Part 3 — Using Feign for Simplifying REST Calls

Part 4 — Distributed Tracing with Sleuth and Zipkin

Part 5 — Implementing Circuit Breaker with Resilience4j

Part 6 — Implementing Retry with Resilience4j

Source Code

You can download the complete source code of this tutorial series from this link.