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/*
* Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
* that can be found in the license/LICENSE.txt file.
*/
package test.coroutines
import kotlin.test.*
import kotlin.coroutines.*
class CoroutineContextTest {
data class CtxA(val i: Int) : AbstractCoroutineContextElement(CtxA) {
companion object Key : CoroutineContext.Key<CtxA>
}
data class CtxB(val i: Int) : AbstractCoroutineContextElement(CtxB) {
companion object Key : CoroutineContext.Key<CtxB>
}
data class CtxC(val i: Int) : AbstractCoroutineContextElement(CtxC) {
companion object Key : CoroutineContext.Key<CtxC>
}
object Disp1 : AbstractCoroutineContextElement(ContinuationInterceptor), ContinuationInterceptor {
override fun <T> interceptContinuation(continuation: Continuation<T>): Continuation<T> = continuation
override fun toString(): String = "Disp1"
}
object Disp2 : AbstractCoroutineContextElement(ContinuationInterceptor), ContinuationInterceptor {
override fun <T> interceptContinuation(continuation: Continuation<T>): Continuation<T> = continuation
override fun toString(): String = "Disp2"
}
@Test
fun testGetPlusFold() {
var ctx: CoroutineContext = EmptyCoroutineContext
assertContents(ctx)
assertEquals("EmptyCoroutineContext", ctx.toString())
ctx += CtxA(1)
assertContents(ctx, CtxA(1))
assertEquals("CtxA(i=1)", ctx.toString())
assertEquals(CtxA(1), ctx[CtxA])
assertEquals(null, ctx[CtxB])
assertEquals(null, ctx[CtxC])
ctx += CtxB(2)
assertContents(ctx, CtxA(1), CtxB(2))
assertEquals("[CtxA(i=1), CtxB(i=2)]", ctx.toString())
assertEquals(CtxA(1), ctx[CtxA])
assertEquals(CtxB(2), ctx[CtxB])
assertEquals(null, ctx[CtxC])
ctx += CtxC(3)
assertContents(ctx, CtxA(1), CtxB(2), CtxC(3))
assertEquals("[CtxA(i=1), CtxB(i=2), CtxC(i=3)]", ctx.toString())
assertEquals(CtxA(1), ctx[CtxA])
assertEquals(CtxB(2), ctx[CtxB])
assertEquals(CtxC(3), ctx[CtxC])
ctx += CtxB(4)
assertContents(ctx, CtxA(1), CtxC(3), CtxB(4))
assertEquals("[CtxA(i=1), CtxC(i=3), CtxB(i=4)]", ctx.toString())
assertEquals(CtxA(1), ctx[CtxA])
assertEquals(CtxB(4), ctx[CtxB])
assertEquals(CtxC(3), ctx[CtxC])
ctx += CtxA(5)
assertContents(ctx, CtxC(3), CtxB(4), CtxA(5))
assertEquals("[CtxC(i=3), CtxB(i=4), CtxA(i=5)]", ctx.toString())
assertEquals(CtxA(5), ctx[CtxA])
assertEquals(CtxB(4), ctx[CtxB])
assertEquals(CtxC(3), ctx[CtxC])
}
@Test
fun testMinusKey() {
var ctx: CoroutineContext = CtxA(1) + CtxB(2) + CtxC(3)
assertContents(ctx, CtxA(1), CtxB(2), CtxC(3))
assertEquals("[CtxA(i=1), CtxB(i=2), CtxC(i=3)]", ctx.toString())
ctx = ctx.minusKey(CtxA)
assertContents(ctx, CtxB(2), CtxC(3))
assertEquals("[CtxB(i=2), CtxC(i=3)]", ctx.toString())
assertEquals(null, ctx[CtxA])
assertEquals(CtxB(2), ctx[CtxB])
assertEquals(CtxC(3), ctx[CtxC])
ctx = ctx.minusKey(CtxC)
assertContents(ctx, CtxB(2))
assertEquals("CtxB(i=2)", ctx.toString())
assertEquals(null, ctx[CtxA])
assertEquals(CtxB(2), ctx[CtxB])
assertEquals(null, ctx[CtxC])
ctx = ctx.minusKey(CtxC)
assertContents(ctx, CtxB(2))
assertEquals("CtxB(i=2)", ctx.toString())
assertEquals(null, ctx[CtxA])
assertEquals(CtxB(2), ctx[CtxB])
assertEquals(null, ctx[CtxC])
ctx = ctx.minusKey(CtxB)
assertContents(ctx)
assertEquals("EmptyCoroutineContext", ctx.toString())
assertEquals(null, ctx[CtxA])
assertEquals(null, ctx[CtxB])
assertEquals(null, ctx[CtxC])
assertEquals(EmptyCoroutineContext, ctx)
}
@Test
fun testPlusCombined() {
val ctx1 = CtxA(1) + CtxB(2)
val ctx2 = CtxB(3) + CtxC(4)
val ctx = ctx1 + ctx2
assertContents(ctx, CtxA(1), CtxB(3), CtxC(4))
assertEquals("[CtxA(i=1), CtxB(i=3), CtxC(i=4)]", ctx.toString())
assertEquals(CtxA(1), ctx[CtxA])
assertEquals(CtxB(3), ctx[CtxB])
assertEquals(CtxC(4), ctx[CtxC])
}
@Test
fun testLastDispatcher() {
var ctx: CoroutineContext = EmptyCoroutineContext
assertContents(ctx)
ctx += CtxA(1)
assertContents(ctx, CtxA(1))
ctx += Disp1
assertContents(ctx, CtxA(1), Disp1)
ctx += CtxA(2)
assertContents(ctx, CtxA(2), Disp1)
ctx += CtxB(3)
assertContents(ctx, CtxA(2), CtxB(3), Disp1)
ctx += Disp2
assertContents(ctx, CtxA(2), CtxB(3), Disp2)
ctx += (CtxB(4) + CtxC(5))
assertContents(ctx, CtxA(2), CtxB(4), CtxC(5), Disp2)
}
@Test
fun testEquals() {
val ctx1 = CtxA(1) + CtxB(2) + CtxC(3)
val ctx2 = CtxB(2) + CtxC(3) + CtxA(1) // same
val ctx3 = CtxC(3) + CtxA(1) + CtxB(2) // same
val ctx4 = CtxA(1) + CtxB(2) + CtxC(4) // different
assertEquals(ctx1, ctx2)
assertEquals(ctx1, ctx3)
assertEquals(ctx2, ctx3)
assertNotEquals(ctx1, ctx4)
assertNotEquals(ctx2, ctx4)
assertNotEquals(ctx3, ctx4)
}
private fun assertContents(ctx: CoroutineContext, vararg elements: CoroutineContext.Element) {
val set = ctx.fold(setOf<CoroutineContext>()) { a, b -> a + b }
assertEquals(listOf(*elements), set.toList())
for (elem in elements)
assertTrue(ctx[elem.key] == elem)
}
@Test
fun testBasicOperations() {
checkContents(EmptyCoroutineContext)
val de1 = DataElement(1)
val de2 = DataElement(2)
checkContents(de1, de1)
checkContents(de2, de2)
checkContents(de1 + de2, de2)
checkContents(de2 + de1, de1)
val oe3 = OtherElement(3)
val oe4 = OtherElement(4)
val de1oe3 = de1 + oe3
checkContents(de1oe3, de1, oe3)
checkContents(de1oe3 + de2, de2, oe3)
checkContents(de1oe3 + oe4, de1, oe4)
checkContents(de1oe3.minusKey(DataElement), oe3)
checkContents(de1oe3.minusKey(OtherElement), de1)
}
@Test
fun testWrapperEquality() {
val we1 = WrapperElement("1")
val we2 = WrapperElement("2")
checkContents(we1, we1)
checkContents(we2, we2)
val we1we2 = we1 + we2
checkContents(we1we2, we1, we2)
checkContents(we1we2.minusKey(WrapperKey("1")), we2)
checkContents(we1we2.minusKey(WrapperKey("2")), we1)
}
@Test
fun testInterceptor() {
val de1 = DataElement(1)
val oe2 = OtherElement(2)
val we3 = WrapperElement("3")
val cci = CustomContinuationInterceptor()
// Make sure it works properly with any position of ContinuationInterceptor in the context
checkContentsAndRemoves(de1 + oe2 + we3 + cci, de1, oe2, we3, cci)
checkContentsAndRemoves(de1 + oe2 + cci + we3, de1, oe2, we3, cci)
checkContentsAndRemoves(de1 + cci + oe2 + we3, de1, oe2, we3, cci)
checkContentsAndRemoves(cci + de1 + oe2 + we3, de1, oe2, we3, cci)
}
private fun checkContentsAndRemoves(context: CoroutineContext, vararg es: CoroutineContext.Element) {
checkContents(context, *es)
for (e in es) {
checkContents(context.minusKey(e.key), *(es.toSet() - e).toTypedArray())
}
}
private fun checkContents(context: CoroutineContext, vararg es: CoroutineContext.Element) {
val size = context.fold(0) { c, _ -> c + 1 }
assertEquals(es.size, size)
for (e in es) {
val key = e.key
assertSame(e, context[key])
}
val set = mutableSetOf<CoroutineContext.Element>()
context.fold(set) { s, e -> s.apply { add(e) } }
assertEquals(set, es.toSet())
when (es.size) {
0 -> assertSame(context, EmptyCoroutineContext)
1 -> assertSame(context, es[0])
}
}
class DataElement(val data: Int) : AbstractCoroutineContextElement(Key) {
companion object Key : CoroutineContext.Key<DataElement>
}
class OtherElement(val data: Int) : AbstractCoroutineContextElement(Key) {
companion object Key : CoroutineContext.Key<DataElement>
}
data class WrapperKey(val key: String) : CoroutineContext.Key<WrapperElement>
class WrapperElement(key: String) : CoroutineContext.Element {
override val key = WrapperKey(key)
}
class CustomContinuationInterceptor : ContinuationInterceptor {
override val key: CoroutineContext.Key<*>
get() = ContinuationInterceptor
override fun <T> interceptContinuation(continuation: Continuation<T>): Continuation<T> =
continuation
}
}
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