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CoroutineContext Key and Element are now inside CoroutineContext interface itself (just like Map.Entry)

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ContinuationInterceptor companion object is named Key
CoroutineContext.Element property for key is named just key
AbstractCoroutineContextElement implements all of CoroutineContext.Element, including key
This commit is contained in:
Roman Elizarov
2017-01-16 10:01:02 +03:00
parent ea7fac07c4
commit 25739a08ea
11 changed files with 98 additions and 118 deletions
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libraries/stdlib/src/kotlin/coroutines/CoroutineContextImpl.kt
+20 -18
View File
@@ -16,23 +16,25 @@
package kotlin.coroutines
import kotlin.coroutines.CoroutineContext.*
/**
* Base class for [CoroutineContextElement] implementations.
* Base class for [CoroutineContext.Element] implementations.
*/
@SinceKotlin("1.1")
public abstract class AbstractCoroutineContextElement : CoroutineContextElement {
public abstract class AbstractCoroutineContextElement(public override val key: Key<*>) : Element {
@Suppress("UNCHECKED_CAST")
public override operator fun <E : CoroutineContextElement> get(key: CoroutineContextKey<E>): E? =
if (this.contextKey == key) this as E else null
public override operator fun <E : Element> get(key: Key<E>): E? =
if (this.key == key) this as E else null
public override fun <R> fold(initial: R, operation: (R, CoroutineContextElement) -> R): R =
public override fun <R> fold(initial: R, operation: (R, Element) -> R): R =
operation(initial, this)
public override operator fun plus(context: CoroutineContext): CoroutineContext =
plusImpl(context)
public override fun minusKey(key: CoroutineContextKey<*>): CoroutineContext =
if (this.contextKey == key) EmptyCoroutineContext else this
public override fun minusKey(key: Key<*>): CoroutineContext =
if (this.key == key) EmptyCoroutineContext else this
}
/**
@@ -40,10 +42,10 @@ public abstract class AbstractCoroutineContextElement : CoroutineContextElement
*/
@SinceKotlin("1.1")
public object EmptyCoroutineContext : CoroutineContext {
public override fun <E : CoroutineContextElement> get(key: CoroutineContextKey<E>): E? = null
public override fun <R> fold(initial: R, operation: (R, CoroutineContextElement) -> R): R = initial
public override fun <E : Element> get(key: Key<E>): E? = null
public override fun <R> fold(initial: R, operation: (R, Element) -> R): R = initial
public override fun plus(context: CoroutineContext): CoroutineContext = context
public override fun minusKey(key: CoroutineContextKey<*>): CoroutineContext = this
public override fun minusKey(key: Key<*>): CoroutineContext = this
public override fun hashCode(): Int = 0
public override fun toString(): String = "EmptyCoroutineContext"
}
@@ -52,8 +54,8 @@ public object EmptyCoroutineContext : CoroutineContext {
// this class is not exposed, but is hidden inside implementations
// this is a left-biased list, so that `plus` works naturally
private class CombinedContext(val left: CoroutineContext, val element: CoroutineContextElement) : CoroutineContext {
override fun <E : CoroutineContextElement> get(key: CoroutineContextKey<E>): E? {
private class CombinedContext(val left: CoroutineContext, val element: Element) : CoroutineContext {
override fun <E : Element> get(key: Key<E>): E? {
var cur = this
while (true) {
cur.element[key]?.let { return it }
@@ -66,13 +68,13 @@ private class CombinedContext(val left: CoroutineContext, val element: Coroutine
}
}
public override fun <R> fold(initial: R, operation: (R, CoroutineContextElement) -> R): R =
public override fun <R> fold(initial: R, operation: (R, Element) -> R): R =
operation(left.fold(initial, operation), element)
public override operator fun plus(context: CoroutineContext): CoroutineContext =
plusImpl(context)
public override fun minusKey(key: CoroutineContextKey<*>): CoroutineContext {
public override fun minusKey(key: Key<*>): CoroutineContext {
element[key]?.let { return left }
val newLeft = left.minusKey(key)
return when (newLeft) {
@@ -85,8 +87,8 @@ private class CombinedContext(val left: CoroutineContext, val element: Coroutine
private fun size(): Int =
if (left is CombinedContext) left.size() + 1 else 2
private fun contains(element: CoroutineContextElement): Boolean =
get(element.contextKey) == element
private fun contains(element: Element): Boolean =
get(element.key) == element
private fun containsAll(context: CombinedContext): Boolean {
var cur = context
@@ -96,7 +98,7 @@ private class CombinedContext(val left: CoroutineContext, val element: Coroutine
if (next is CombinedContext) {
cur = next
} else {
return contains(next as CoroutineContextElement)
return contains(next as Element)
}
}
}
@@ -115,7 +117,7 @@ private class CombinedContext(val left: CoroutineContext, val element: Coroutine
private fun CoroutineContext.plusImpl(context: CoroutineContext): CoroutineContext =
if (context == EmptyCoroutineContext) this else // fast path -- avoid lambda creation
context.fold(this) { acc, element ->
val removed = acc.minusKey(element.contextKey)
val removed = acc.minusKey(element.key)
if (removed == EmptyCoroutineContext) element else {
// make sure interceptor is always last in the context (and thus is fast to get when present)
val interceptor = removed[ContinuationInterceptor]