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fun main(): Unit = runBlocking {
val job = launch(Dispatchers.IO) {
val tasks = downloadAllTasks()
printTasks(tasks)
}
delay(100)
job.cancel()
}
private suspend fun downloadAllTasks(): List<Task> {
return suspendCancellableCoroutine { continuation ->
continuation.invokeOnCancellation { print("Cancelled...") }
downloadTasks(ContinuationAdapter(continuation))
}
}
private class ContinuationAdapter(
private val continuation: Continuation<List<Task>>
) : DownloadCallback {
override fun onDownloaded(tasks: List<Task>) {
continuation.resume(tasks)
}
}
interface DownloadCallback {
fun onDownloaded(tasks: List<Task>)
}
private fun downloadTasks(callback: DownloadCallback) {
println("Downloading...")
sleep(150) // simulate network latency
val tasks = listOf(Task(1), Task(2), Task(3))
callback.onDownloaded(tasks)
}
private fun printTasks(tasks: List<Task>) {
tasks.forEach { task -> println(task.id) }
}
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