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KT-36118 Introduce AbstractCoroutineContextKey and corresponding extensions required by its implementors

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* It enables subtyping relationship for keys and elements, allowing type-safe and concise manipulations on the context when complex hierarchies of elements (e.g. implementors of ContinuationInterceptor) are present
    * It unblocks possibility to implement suspendCancellableCoroutine in stdlib
    * Implementing proper polymorphic get and minusKey in AbstractCoroutineContextElement is impossible because it will introduce source-incompatible change
    * ContinuationInterceptor get and minusKey are adjusted in a completely backwards-compatible way
This commit is contained in:
Vsevolod Tolstopyatov
2020-01-24 14:46:21 +03:00
parent 90fe1bb1ab
commit a00e98bad9
5 changed files with 409 additions and 9 deletions
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libraries/tools/binary-compatibility-validator/reference-public-api/kotlin-stdlib-runtime-merged.txt
+9
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@@ -2683,6 +2683,10 @@ public abstract class kotlin/coroutines/AbstractCoroutineContextElement : kotlin
public fun plus (Lkotlin/coroutines/CoroutineContext;)Lkotlin/coroutines/CoroutineContext;
}
public abstract class kotlin/coroutines/AbstractCoroutineContextKey : kotlin/coroutines/CoroutineContext$Key {
public fun <init> (Lkotlin/coroutines/CoroutineContext$Key;Lkotlin/jvm/functions/Function1;)V
}
public abstract interface class kotlin/coroutines/Continuation {
public abstract fun getContext ()Lkotlin/coroutines/CoroutineContext;
public abstract fun resumeWith (Ljava/lang/Object;)V
@@ -2742,6 +2746,11 @@ public final class kotlin/coroutines/CoroutineContext$Element$DefaultImpls {
public abstract interface class kotlin/coroutines/CoroutineContext$Key {
}
public final class kotlin/coroutines/CoroutineContextImplKt {
public static final fun getPolymorphicElement (Lkotlin/coroutines/CoroutineContext$Element;Lkotlin/coroutines/CoroutineContext$Key;)Lkotlin/coroutines/CoroutineContext$Element;
public static final fun minusPolymorphicKey (Lkotlin/coroutines/CoroutineContext$Element;Lkotlin/coroutines/CoroutineContext$Key;)Lkotlin/coroutines/CoroutineContext;
}
public final class kotlin/coroutines/EmptyCoroutineContext : java/io/Serializable, kotlin/coroutines/CoroutineContext {
public static final field INSTANCE Lkotlin/coroutines/EmptyCoroutineContext;
public fun fold (Ljava/lang/Object;Lkotlin/jvm/functions/Function2;)Ljava/lang/Object;