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private fun loadData() = launch(uiContext) {
view.showLoading() // ui thread
val task = async(bgContext) { dataProvider.loadData("Task") }
// non ui thread, suspend until the task is finished or return null in 2 sec
val result = withTimeoutOrNull(2, TimeUnit.SECONDS) { task.await() }
view.showData(result) // ui thread
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