Learning Concurrency in Kotlin

Canceling

An active job that is requested to be cancelled may enter a staging state called canceling. To request a job to cancel its execution, the cancel() function should be called:

fun main(args: Array<String>) = runBlocking {    val job = launch {        // Do some work here        delay(5000)    }    delay(2000)    job.cancel()}

Here, the execution of the job will be cancelled after 2 seconds; cancel() has an optional cause parameter. If an exception is the cause of the cancellation, it's a good practice to send it there; that way, it can be retrieved at a later time:

fun main(args: Array<String>) = runBlocking {    val job = launch {        // Do some work here        delay(5000)    }    delay(2000)        // cancel with a cause    job.cancel(cause = Exception("Timeout!"))}

There is also a ...