This demo uses Kubernetes as Docker environment. Kubernetes also support service discovery and load balancing. An Apache httpd as a reverse proxy routes the calls to the services.
Also the demo uses Istio for features like monitoring, tracing, fault injection, and circuit breaking.
This project creates a complete micro service demo system in Docker containers. The services are implemented in Java using Spring Boot and Spring Cloud.
It uses three microservices:
Orderto accept orders.
Shippingto ship the orders.
Invoicingto ship invoices.
See How to run.
The microservices are:
The microservices have an Java main application in
run them stand alone. microservice-demo-shipping and
microservice-demo-invoicing both use a stub for the
other order service for the tests.
The data of an order is copied - including the data of the customer and the items. So if a customer or item changes in the order system this does not influence existing shipments and invoices. It would be odd if a change to a price would also change existing invoices. Also only the information needed for the shipment and the invoice are copied over to the other systems.
The job to poll the order feed is run every 30 seconds.