How to Run Cron Jobs in Kotlin Ktor?

问题:

Is there a way to run Cron Jobs with Ktor? My end objective is to host a Cron Job written with Kotlin for the Coinverse app's backend service to populate data.

I'm currently hosting multiple Java .jar apps written in Kotlin on AppEngine. I'm looking to refactor these apps into Ktor apps on AppEngine with a Cron Job for scheduled tasks, as the .jar apps have more issues with dependencies.

I'm looking for Ktor's equivalent to Cloud Functions' built-in implementation for Cron Jobs with JavaScript.

functions.pubsub.schedule

Back-up option: If Ktor does not have this feature and I want to keep the code in Kotlin, Google has an alpha, Using Kotlin with Google Cloud Functions. It appears Kotlin + Cloud Functions' built-in implementation could be used with this approach.

回答1:

Sergey Mashkov from the JetBrains team suggests in the kotlinlang Slack group to launch a Kotlin Coroutine on the Application scope using an infinite loop and delay.

Then, the Ktor app can be deployed to AppEngine.

fun Application.main() {
    launch {
        while(true) {
            delay(600000)
            // Populate data here.
        }
    }
}