Co-presented with Nicolas Frankel at Oracle Code One (October 2018).

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Serverless Kotlin
David Delabassée - Oracle
@delabassee
Nicolas Fränkel - Exoscale
@nicolas_frankel
October 2018

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Safe Harbor Statement
The following is intended to outline our general product direction. It is intended for
information purposes only, and may not be incorporated into any contract. It is not a
commitment to deliver any material, code, or functionality, and should not be relied upon
in making purchasing decisions. The development, release, timing, and pricing of any
features or functionality described for Oracle’s products may change and remains at the
sole discretion of Oracle Corporation.

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@delabassee from Belgium

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@nicolas_frankel from France

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• Simple, scalable and safe European alternative to the big cloud-computing
players
• Privacy-minded
• Great support
https://exoscale.com

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Serverless

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Function as a Service
• Function
• As a Service
Small bits of code with a well defined job
Easy to understand and maintain
The system takes care of provisioning, scaling, patching, ...
Each function can scale independently

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Serverless Servers
“ ‘ Serverless ’ is just a name.
We could have called it ‘ Jeff ’ ”
- Paul Johnston
https://serverless.zone/serverless-is-just-a-name-we-could-have-called-it-jeff-1958dd4c63d7

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Why Serverless?
• No Server
• Automatic Scaling
• Only pay for what you use
• Agility
Management

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Open Source Container Native FaaS Platform
Introducing Fn Project
https://github.com/fnproject

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Introducing Fn Project
Open Source
Approachable
Container based
Platform independent
Language independent
Scheduler independent
No lock-in
Easy for new users
More controls for advanced users
Leverage Docker and its ecosystem
Cloud, On-Perm, laptop
Go, Java, Python, …
K8S, ...

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Introducing Fn Function
Code wrapped in a Container Image
– Input from stdin
Output to stdout
Logs to stderr
– or simply use an FDK!
Fn handles everything else!

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Fn Architecture
• Fn CLI
• Fn FDK's
• Local
• Exoscale

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Polyglot
• Go
• Java
• Python
• JS
• Rust
• Ruby
• … bring your own!

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Kotlin

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Kotlin
“ Statically typed programming language
for the JVM, Android, native and the
browser ”
https://kotlinlang.org/

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Kotlin - A Few Facts
• Developed by JetBrains
– Co-managed with Google
– Supported by Pivotal for Spring/Boot
• Open Source
• Compiles to
– JVM bytecode
– JavaScript
– (Native)
• Lot of traction

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Kotlin - Features
• Functional and object-oriented
• Statically-typed
• Null safety
• No checked exceptions
• Named & optional arguments
• Lambdas
• Java compatibility
• And more...

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Kotlin – Killer Features
• Extension methods
• Extension properties

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Demo

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Wrap-up

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Fn
• Container Native, Cloud Agnostic, Polyglot, Open Source FaaS Platform
https://github.com/fnproject https://exoscale.com https://kotlinlang.org

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Merci!
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