Computer scienceProgramming languagesKotlinConcurrency and parallelismConcurrency

Сontext and Dispatchers

Theory

Load data in IO pool and print in UI thread

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Let's replicate a very common patten in UI applications: load some data, wait for it to enter the IO thread without blocking the UI, then display it in the UI thread, and let the IO code do its job.

There is no Dispatchers.Main available for our console app, so use UiDispatcher instead.

Tip: launch() can take any context element as a parameter, so use it to set the right dispatcher.

Write a program in Kotlin
fun main() = runBlocking(Dispatchers.Default) {
// Modify this code to make sure data loading and storing
// happens in Dispatchers.IO, but data printing in `UiDispatcher`
// which is already defined for you as a replacement for Dispatchers.Main
val mainJob = mainScope.launch {
val data = loadData()
printData(data)
storeData(data)
}
mainJob.join()
}
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