Mastering Kotlin Coroutines/

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Mechanism and Performance of Dispatchers

Mechanism and Performance of Dispatchers

Learn which mechanism dispatchers work on and the performance of dispatchers against different tasks.

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Continuation interceptor

Dispatching works based on the mechanism of continuation interception, built into the Kotlin language. There is a coroutine context named ContinuationInterceptor whose interceptContinuation method is used to modify a continuation when a coroutine is suspended. Thanks to the caching mechanism, wrapping needs to happen only once per continuation. It also has a releaseInterceptedContinuation method called when a continuation ends.

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

The capability to wrap a continuation gives a lot of control. Dispatchers use interceptContinuation to wrap a continuation with DispatchedContinuation, which runs ...