Explore creating robust HTTP services in Scala's functional programming paradigm. Gain insights into pure vs. impure implementations, their pros and cons, and effective tool usage.

scala-platform.tar.gz

Scala-Pure

Scala-Impure

Scala-Tapir

Scala-Impure-Test

Scala-Pure-Test

Scala-Tapir-Test

Test

Scala - Run Code Widget 

Scala-Pure-copy

Scala is one of the most popular general-purpose languages that supports both object-oriented and functional programming. In this course, you will learn how to create back-end HTTP services using Scala's functional programming paradigm.

You will also learn how to develop, test, and document the service using both pure and impure ways. You will be exposed to the differences between pure and impure implementation, their respective pros and cons, and how pure implementation can be more robust in terms of performance, understandability, testability, and type safeness. 

By the end of the course, you will have a clear idea of how functional programming works in Scala and how you can use the available tools more effectively.

Pure Functional HTTP APIs in Scala

# Basic routes

Defining the routes is pretty simple if you are used to the Akka-HTTP routing DSL syntax. 


val route = path("product" / JavaUUID) { id: ProductId =>
  get {
    ???
  } ~ put {
    ???
  }
} ~ path("products") {
  get {
    ???
  } ~
  post {
    ???
  }
}

# Starting the server

Now, let's start the actual server to make use of our routes. 


val host = system.settings.config.getString("api.host")
val port = system.settings.config.getInt("api.port")
val srv = Http().bindAndHandle(route, host, port)
val pressEnter = StdIn.readLine()
srv.flatMap(_.unbind()).onComplete(_ => system.terminate())

The code will fire up a server using the defined routes, hostname, and port from the configuration. It will run until you press `enter`, which will cause it to terminate.

Learn how to start the server and implement the routes for returning and updating a single product.

Introduction

Impure Implementation

Pure Implementation

Testing Impure Services

Testing Pure Services

Benchmarks

Documentation

Epilogue

Akka-HTTP Routes

Basic routes

Starting the server