.. _event_driven_apps_tutorial:

Designing Event Driven Systems
==============================

This page provides an accompanyment to the O'Reilly book "Designing Event Driven Systems". You can `download the book <https://www.confluent.io/designing-event-driven-systems>`_ in PDF or eReader format from the Confluent website. 

The source code for the examples discussed in Chapter 15 is `available on GitHub <https://github.com/confluentinc/kafka-streams-examples/tree/4.0.0-post/src/main/java/io/confluent/examples/streams/microservices>`_ . This provides an example of a simple Orders Service that validates orders as they arrive, all built with |kstreams|.

For a great introduction for developers who are just getting started with stream processing, refer to the free, self-paced :ref:`Kafka Streams tutorial<tutorial-microservices-orders>`.
The tutorial centers on the order management workflow described in the book.
It's built using |kstreams|, so business events that describe the order management workflow propagate through this ecosystem.
You'll learn the basics of the |kstreams| API and common patterns to design and build event-driven applications.

If you have feedback on the code examples please raise an issue in GitHub. For feedback on the book please `contact us <mailto:docs@confluent.io?subject=Designing-Event-Driven-Services>`_.