Learning Concurrency in Kotlin

ContinuationInterceptor

As we discussed earlier in the book, the CoroutineContext behaves like a map where all the different CoroutineContext.Element are stored with their own unique key. One of those elements is defined by the ContinuationInterceptor interface. Let's take a look at it:

public interface ContinuationInterceptor : CoroutineContext.Element {    companion object Key : CoroutineContext.Key<ContinuationInterceptor>    fun <T> interceptContinuation(cont: Continuation<T>): Continuation<T>}

Notice that apart from its key, it only defines a function that takes a continuation and returns another. The idea is for the implementation of ContinuationInterceptor to wrap the received continuation into another, one that is intercepted in order to ...