[Custom Coroutine Scope] #kotlin #coroutine

CustomScope.kt

class CustomScope : CoroutineScope {

  private var parentJob = Job()

  override val coroutineContext: CoroutineContext
    get() = Dispatchers.Main + parentJob

  fun onStart() {
    parentJob = Job()
  }

  fun onStop() {
    parentJob.cancel()
    // You can also cancel the whole scope with `cancel(cause: CancellationException)`
  }
}

Main.kt

fun main() {
  val scope = CustomScope()

  scope.launch {
    println("Launching in custom scope")
  }

  scope.onStop() //cancels all the coroutines
}