This is the example code for my book Microservice patterns.

• The code is still work in progress

• It primarily illustrates the technical aspects of the microservice architecture and so the business logic is minimal

• The documentation is sparse/non-existent and you will need to look in the book

• The application consists of many services and so requires a lot of memory. It runs well, for example, on a 16GB Macbook pro.

• The application’s services and the infrastructure services, such as MySQL and Apache Kafka, are deployed using Docker containers using either Docker Compose or Kubernetes.

Please post a message to the book’s discussion forum or create a github issue. I’ll do my best to help you.

Not surprisingly, this application has a microservice architecture. There are the following services:

• ftgo-consumer-service - the Consumer Service

• ftgo-restaurant-service - the Restaurant Service

• ftgo-order-service - the Order Service

• ftgo-kitchen-service - the Kitchen Service

• ftgo-accounting-service - the Accounting Service

• ftgo-order-history-service - a Order History Service, which is a CQRS view

• ftgo-api-gateway - the API gateway

Key points:

• A service consists of a single Gradle module. For example, ftgo-order-service implements the Order Service

• A service is a Spring Boot application

• A service has a Swagger UI http://…​/swagger-ui.html. See open-swagger-uis.sh

• A service typically consists of the following packages:

  • domain - domain logic including aggregates

  • messaging - messaging adapters

  • web - Spring MVC controllers (HTTP adapters)

  • main - the main application

• The services use the following other frameworks

  • Eventuate Tram framework - implements transactional messaging

  • Eventuate Tram Saga framework - implements sagas

  • Eventuate Client framework - implements event sourcing

This section maps the chapters to the code.

You can find Kubernetes YAML files in the following directories: deployment/kubernetes and */src/deployment/kubernetes. There are also some helpful shell scripts.