A modern programming language that makes developers happier.

kotlinlang

Hi folks. I want to share my latest update to <https://github.com/kevincianfarini/cardiologist|Cardiologist> — 0.5.0. This release is nearly feature complete before a 1.0.0. At this point I’m pretty much just waiting for kotlinx-datetime to get to 1.0.0 before I can :smile:

Cardiologist lets you build job schedules with kotlinx-coroutines and kotlinx-datetime. This release features:

• Day-of-week scheduling and fully mimicking cron’s behavior with day of week and day of month scheduling.
• Backpressure handling (eg. execute slow jobs concurrently, skip new jobs when an old job is still running, or cancel the previous job when a new one is supposed to start).
• A type-safe DSL for creating complex job schedules:
```clock.schedulePulse {
  atSeconds(0)
  atMinutes(0, 10, 20, 30, 40, 50)
  inMonths(Month.May, Month.December)
  onDaysOfWeek(DayOfWeek.Friday)
}```
• A new API for scheduling one-off jobs.
```val instant = Instant.parse("2025-05-10T13:15:00Z")
clock.executeAt(instant) { 
    println("I executed at ${clock.now()}!")
}```
• The ability to schedule jobs with standard cron expressions:
```clock.schedulePulse(cronExpression = "* * * * *")```
• Improved documentation which I put a lot of effort into
• Some bug fixes

Nice library but I am glad that I realised early enough that it doesn’t support JS and wasmJs :cry:.