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Scala Programming Projects

You're reading from   Scala Programming Projects Build real-world projects using popular Scala frameworks such as Play, Akka, and Spark

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Product type Paperback
Published in Sep 2018
Publisher Packt
ISBN-13 9781788397643
Length 398 pages
Edition 1st Edition
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Authors (2):
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Mikael Valot Mikael Valot
Author Profile Icon Mikael Valot
Mikael Valot
Nicolas Jorand Nicolas Jorand
Author Profile Icon Nicolas Jorand
Nicolas Jorand
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Toc

Table of Contents (13) Chapters Close

Preface 1. Writing Your First Program FREE CHAPTER 2. Developing a Retirement Calculator 3. Handling Errors 4. Advanced Features 5. Type Classes 6. Online Shopping - Persistence 7. Online Shopping - REST API 8. Online Shopping - User Interface 9. Interactive Browser 10. Fetching and Persisting Bitcoin Market Data 11. Batch and Streaming Analytics 12. Other Books You May Enjoy

Implementing the server side


At the server level, we need to open a communication channel between the server and the browser; once the communication is open, we need to implement the message reception and broadcast it to all of the connected browsers using Actors.

Creating the web socket route

To create the route, the conf/routes file needs to be modified by adding the following:

GET /v1/cart/events controllers.WebSockets.cartEventWS 

Notice that the route is defined in the same way as a regular web service call; so, the GET call on /v1/cart/events is routed to the cartEventWS method of thecontrollers.WebSockets instance.

Next, we need to create the WebSockets class in the controllers package of the server module, and add the cartEventsWS method, as follows:

@Singleton
class WebSockets @Inject()(
  implicit actorSystem: ActorSystem,
  materializer: Materializer,
  cc: ControllerComponents) extends AbstractController(cc) {

  def cartEventWS = WebSocket.accept[String, String] { 
    implicit request...
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