kotlinx-coroutines-core/src/test/kotlin/examples/example-09.kt

package examples

import kotlinx.coroutines.experimental.CommonPool
import kotlinx.coroutines.experimental.delay
import kotlinx.coroutines.experimental.launch
import kotlinx.coroutines.experimental.runBlocking

fun main(args: Array<String>) = runBlocking<Unit> {
    val job = launch(CommonPool) {
        var nextPrintTime = 0L
        var i = 0
        while (isActive) { // cancellable computation loop
            val currentTime = System.currentTimeMillis()
            if (currentTime >= nextPrintTime) {
                println("I'm sleeping ${i++} ...")
                nextPrintTime = currentTime + 500L
            }
        }
    }
    delay(1300L) // delay a bit
    println("I'm tired of waiting!")
    job.cancel() // cancels the job
    delay(1300L) // delay a bit to see if it was cancelled....
    println("Now I can quit.")
}