Threads vs Coroutines - ParallelMap in Kotlin
When running on the JVM, if we need to run things concurrently we can use Java APIs or Kotlin coroutines. In this episode we implement a parallelMap operation using streams, raw threads, a threadpool with futures, and coroutines. The results may surprise you!
This is part 55 of an exploration of where a Test Driven Development implementation of the Gilded Rose stock control system might take us in Kotlin. You can see the whole series as a playlist
• All Gilded Rose Episodes
and the code on GitHub
https://github.com/dmcg/gilded-rose-tdd
There has been some discussion on Reddit about my use of AtomicReference in the threads implementation. I'm persuaded that any old non-thread-safe holder would do, and would probably be more performant - / j089h0d
The next episode ( • Threads vs Coroutines - ParallelMap P... ) measures the performance of the implementations.
If you like this, you’ll probably like the book Java to Kotlin, A Refactoring Guidebook
http://java-to-kotlin.dev , and maybe join Nat Pryce and me on our TDD workshop at KotlinConf in April next year https://kotlinconf.com/workshops/
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