Agile Venture Milan - Unit testing on AS400? Yes we can! (With Kotlin)

Franco Lombardo – Agile software developer @Sme.UP
franco.lombardo@smeup.com
Twitter: @f_lombardo
Milan - 1st February 2020AGILE VENTURE 2020
Unit testing on AS400?
Yes, we can! (With Kotlin)

AS400 ~= RPG

AS400 ~= RPG
AS400 programs
~=
RPG programs
(Report Program Generator)

RPG – What is RPG?
"RPG is an IBM proprietary
programming language
and its later versions are
available only on IBM i
or OS/400-based systems"
Wikipedia

RPG – Available only on IBM i
How can you learn it?

How can you create prototypes?

Infrastructure as code?
How to create and distribute
pre-configured machines (DevOps)

Horizontal scalability?

RPG – IBM proprietary
Could RPG grow
independently from IBM?

RPG – IBM proprietary
How to add new technologies
quickly

RPG interpreter – Towards a better RPG
Our idea:
creating an RPG interpreter
- Open Source
- Portable: working both on IBM i,
and on other platforms (Kotlin + ANTLR)
- Extendable
extendable

RPG interpreter – Why Kotlin?
Seamless integration
with Java
(and its libraries)

Succinct
↓
less boilerplate code
↓
easier to understand
(less cognitive overload)
↓
fewer bugs

Lots of data classes

Test blocks of RPG CODE easily

Default arguments: less overloading

Succinct,
but comprehensible
(OK, you can write cryptic code in Kotlin too, but…)
See for example Scala… ☺

Composing nullable values/functions
in a safe way
Can be null
Not null

Code organization based on domain aspects
Extension methods for domain objects
regarding the “SQL aspect”

RPG interpreter – From RPG to a DSL

RPG interpreter – Unit tests in RPG

RPG interpreter – A modern ecosystem
• Unit Tests
• Editor
• Debugger
• Version Control System
Side effects of our project:

RPG interpreter – A sample workflow

RPG interpreter – Visual Studio Code

RPG Interpreter – The rules for FizzBuzz
• We get an integer number as input
• If it’s divisible by 3 the output is ‘FIZZ’
• If it’s divisible by 5 the output is ‘BUZZ’
• If it’s divisible by 3 and by 5 the output is
‘FIZZBUZZ’
• Otherwise the output is the input number
8-9 Novembre 2019ITALIAN AGILE DAYS 2019
See the video on YouTube: http://bit.ly/fizzbuzzrpg

Interprete RPG – Visual Studio Code

RPG Interpreter – Purposes
8-9 Novembre 2019ITALIAN AGILE DAYS 2019
The purpose of this project
is not getting rid of AS400
(although you will be able to do it),
but creating a modern ecosystem
and giving customers and developers
the opportunity to choose
where to run their applications

AS400 ~= RPG
Please, Ginni, don’t do it!

RPG interpreter – JaRIKo
A great team (thanks to Strumenta.com), but...
We want you!
https://github.com/smeup/jariko

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info@smeup.com
+39 030 7724111
SME UP S.p.A.
Via Iseo, 43 - 25030 Erbusco (BS) - Italy
www.smeup.com

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