Posts tagged "Kotlin"
Building a CLI with Quarkus, Kotlin and GraalVM
Command-line tools are great for automation, but choosing the right technology stack to build them can be tricky. I recently set out to build a new command-line application to streamline some tasks, drawing from previous experiences where the tooling left me wanting more.
This time, I chose a different combination of technologies that better suits my needs: Kotlin, Quarkus, and GraalVM. In this blog, I’ll walk you through the setup and decisions behind this stack—so you can get up and running even faster when building your own CLI tools.
— Read more... →Devoxx 2017
Almost two months ago I visited Devoxx 2017. It’s about time to write some notes on the stuff I learnt there!
Event Storming & DDD workshop
The week started off with a full afternoon workshop led by Stijn Vanpoucke. The workshop consisted of small pieces of theory, alternated with exercises using post-it’s and markers.
A few of the theoretic pieces:
- An event is something that has happened in the past. It is usually phrased in past tense. It should be understandable for business users.
- A command is an user-initiated action. It explains the origin and sometimes the reason for the action.
- An entity is an individual thing. It has a unique identity. Often, entities are mutable.
- A value object is an non-unique value. It is often immutable. Its equality is based on it’s attributes. It should be able to validate itself. They can be combined.
- An aggregate is a combination of entities and value objects. They are structured in a hierarchy. Its root is always an entity. Aggregates contain business rules. Note that a bigger aggregate is not always better! To circumvent this, aggregates can use soft links based on the unique identity of other entities.
- The bounded context describes the context from which you look at it. Take a pen as example; what a pen is depends on the context from which you look at it. To stress the fact that it has boundaries, it is called a bounded context. Bounded contexts support the idea of having “one team, one (business) language”. The bigger the bounded context is, the bigger the language, whether artificial or natural. Finally, multiple domains can have different words for the same concept. A sales department might speak of products while inventory management might name the same concept article.
Kotlin for Java programmers
This year had a lot of talks about Kotlin scheduled. To visit them all would take too much time, so I decided to follow just one by Venkat Subramaniam. I figured it would give me about the same amount of content…
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