Learning Concurrency in Kotlin

Creating a coroutine to call a service

Now it's a good time to add a call to a service. To start with something simple, we will use Java's DocumentBuilder to call an RSS feed for us. First, we will add a variable to hold the DocumentBuilderFactory below where we put the dispatcher:

private val dispatcher = newSingleThreadContext(name = "ServiceCall")private val factory = DocumentBuilderFactory.newInstance()

The second step is to create a function that will do the actual call:

private fun fetchRssHeadlines(): List<String> {  val builder = factory.newDocumentBuilder()  val xml = builder.parse("https://www.npr.org/rss/rss.php?id=1001")  return emptyList()}

Notice how the function is, for now, returning an empty list of strings after calling the ...