Learning Concurrency in Kotlin

Adding a channel so that the UI reacts to updates

To make the implementation more interesting, let's make it so that the UI can listen to increments in the counter – and update the label – by subscribing to a channel. First, let's add a channel property to ResultsCounter:

object ResultsCounter {    private val context = newSingleThreadContext("counter")    private var counter = 0    private val notifications = Channel<Int>(Channel.CONFLATED)    ...}

We are making this channel private so that we can retrieve it as a ReceiveChannel, preventing the clients of the API from trying to send messages using it. We are making the channel conflated because we don't care if some notifications are lost: the UI only cares about the most recent value for the counter. ...