Practical Event Sourcing with Scala
This book is 100% complete
Completed on 2019-02-20
About the Book
This book takes a very practical and rather unusual approach towards the event sourcing architecture. Instead of diving into the DDD terminology, which is usually popular in the Enterprise, we will use this pattern to implement a typical Web application.
Instead of C# or Java, we will be using Scala as the backend language and JavaScript (ES6) as the frontend one. Along the way, we will also make use of some other supporting technologies such as Play, Kafka, Akka Streams, React (with Redux) and even Neo4J.
You don't need to be a Scala guru to understand code samples, but some familiarity with the syntax is required. If you're completely new to Scala, I highly recommend you go through the free sample of my other book - Modern Web Development with Scala. The PDF sample could be read in an hour, but it covers most widely used syntax constructs.
Which versions are used
The main examples use Scala 2.12 and Play 2.7. When additional libraries are needed, their latest versions are used.
Acknowledgements
My special thanks go to Tim Ruhland for his enormous help in eliminating typos and errors. The cover illustration was designed by Freepik
About the Author
Bundles that include this book
Table of Contents
- Preface
-
Chapter 1. The initial project
- Preparing the environment
- Initializing the project
- The backend part
- The frontend part
-
Chapter 2. Handling simple events
- Event sourcing basics
- Preparing the event store
- Working with log records
- The read service
- Producing events
- Implementing the controller
- Learning React in 5 minutes
- Managing tags with React
-
Chapter 3. Data processing pipeline
- Introducing Kafka
- Akka Streams in 5 minutes
- Using Kafka from Scala
- Server-sent events
- Managing state with Redux
- Implementing Kafka consumers
-
Chapter 4. Validating and querying data
- Dealing with questions
- Linking questions to users
- Implementing server-side validation
- Installing Neo4J
- The Cypher query language
- Executing Neo4J statements
- Rewriting the read service
- Integrating user-related events
- Initializing the state
-
Chapter 5. Frontend routing
- Adding the question controller
- Designing the views
- Nested views
- The Ask question view
- Showing validation errors
- The question list view
- Confirmation service
- Dealing with question threads
- The question details view
- Routing it all together
-
Chapter 6. Answers and upvotes
- Answers and upvotes
- Validating new event types
- Adjusting the read state
- Answers on the frontend
-
Chapter 7. Time travelling
- Rewinding in chunks
- Time travel dashboard
- Using Websockets
- Closing remarks
- Appendix A. Source code
The Leanpub 45-day 100% Happiness Guarantee
Within 45 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.
See full terms
Free Updates. Free App. DRM Free.
If you buy a Leanpub book, you get free updates for as long as the author updates the book! Many authors use Leanpub to publish their books in-progress, while they are writing them. All readers get free updates, regardless of when they bought the book or how much they paid (including free).
Most Leanpub books are available in PDF (for computers), EPUB (for phones and tablets), MOBI (for Kindle) and in the free Leanpub App (for Mac, Windows, iOS and Android). The formats that a book includes are shown at the top right corner of this page.
Finally, Leanpub books don't have any DRM copy-protection nonsense, so you can easily read them on any supported device.
Learn more about Leanpub's ebook formats and where to read them
