val exe = AppExecutors
exe.util {
    val first = calculateFirst()
    val second = calculateSecond()
    val str = ("first = $first | second = $second")
    exe.main {
        Toast.makeText(activity, "Executors $str", Toast.LENGTH_LONG).show()
    }
}

object AppCoRoutines{
    private val uiContext: CoroutineContext = Dispatchers.Main
    private val ioContext: CoroutineContext = Dispatchers.IO
    private val networkContext: CoroutineContext = Executors.newFixedThreadPool(3).asCoroutineDispatcher()
    private val singleContext: CoroutineContext = Executors.newSingleThreadExecutor().asCoroutineDispatcher()

    val ui: CoroutineScope = CoroutineScope(uiContext)
    val io: CoroutineScope = CoroutineScope(ioContext)
    val net: CoroutineScope = CoroutineScope(networkContext)
    val single: CoroutineScope = CoroutineScope(singleContext)
}

val coRout = AppCoRoutines
coRout.ui.launch {
    val str: String = withContext(coRout.net.coroutineContext){
        val first = async { calculateFirst() }
        val second = async { calculateSecond() }
        ("first = $first | second = $second")
    }
    Toast.makeText(activity, "CoRoutine $str", Toast.LENGTH_LONG).show()
}