Kotlin Serverless

This is a small example illustrating this blog post about doing Serverless functions in Kotlin.

First I recommend to read this article by Mike Roberts from Martin Fowler website to get a bit more understanding on what is a Serverless architecture.

Them we should take a loot to the System Overview of Apache Openwhisk.

You need to have OpenWhisk up and running, them fist build this function:

$ mvnw package

Now you could add an action to OpenWhisk with:

$ cd target
$ wsk action create Fibonacci KotlinServerless-1.0-SNAPSHOT-jar-with-dependencies.jar --main \
  org.learning.by.example.serverless.kotlin.FibonacciKt

To test the new action just run:

$ wsk action invoke --result Fibonacci --param numbers 5 

This will output something like:

{
  "result": [
      1,
      1,
      2,
      3,
      5
  ]
}