| /* |
| * Copyright 2016-2017 JetBrains s.r.o. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package kotlinx.coroutines.experimental.future |
| |
| import kotlinx.coroutines.experimental.CoroutineDispatcher |
| import org.junit.Test |
| import java.util.concurrent.CompletableFuture |
| import java.util.concurrent.ExecutionException |
| import java.util.concurrent.atomic.AtomicInteger |
| import kotlin.coroutines.experimental.CoroutineContext |
| import org.junit.Assert.* |
| |
| class FutureTest { |
| @Test |
| fun testSimple() { |
| val future = future { |
| CompletableFuture.supplyAsync { |
| "O" |
| }.await() + "K" |
| } |
| |
| assertEquals("OK", future.get()) |
| } |
| |
| @Test |
| fun testWaitForCompletion() { |
| val toAwait = CompletableFuture<String>() |
| val future = future { |
| toAwait.await() + "K" |
| } |
| |
| assertFalse(future.isDone) |
| toAwait.complete("O") |
| |
| assertEquals("OK", future.get()) |
| } |
| |
| @Test |
| fun testDoneFutureCompletedExceptionally() { |
| val toAwait = CompletableFuture<String>() |
| toAwait.completeExceptionally(RuntimeException("O")) |
| val future = future<String> { |
| try { |
| toAwait.await() |
| } catch (e: RuntimeException) { |
| e.message!! |
| } + "K" |
| } |
| |
| assertFalse(future.isDone) |
| assertEquals("OK", future.get()) |
| } |
| |
| @Test |
| fun testAwaitedFutureCompletedExceptionally() { |
| val toAwait = CompletableFuture<String>() |
| val future = future<String> { |
| try { |
| toAwait.await() |
| } catch (e: RuntimeException) { |
| e.message!! |
| } + "K" |
| } |
| |
| assertFalse(future.isDone) |
| toAwait.completeExceptionally(RuntimeException("O")) |
| |
| assertEquals("OK", future.get()) |
| } |
| |
| @Test |
| fun testExceptionInsideCoroutine() { |
| val future = future { |
| if (CompletableFuture.supplyAsync { true }.await()) { |
| throw IllegalStateException("OK") |
| } |
| CompletableFuture.supplyAsync { "fail" }.await() |
| } |
| |
| try { |
| future.get() |
| fail("'get' should've throw an exception") |
| } catch (e: ExecutionException) { |
| assertTrue(e.cause is IllegalStateException) |
| assertEquals("OK", e.cause!!.message) |
| } |
| } |
| |
| @Test |
| fun testContinuationWrapped() { |
| val depth = AtomicInteger() |
| |
| val future = future(wrapContinuation { |
| depth.andIncrement |
| it() |
| depth.andDecrement |
| }) { |
| assertEquals("Part before first suspension must be wrapped", 1, depth.get()) |
| |
| val result = |
| CompletableFuture.supplyAsync { |
| while (depth.get() > 0) ; |
| assertEquals("Part inside suspension point should not be wrapped", 0, depth.get()) |
| "OK" |
| }.await() |
| |
| assertEquals("Part after first suspension should be wrapped", 1, depth.get()) |
| |
| CompletableFuture.supplyAsync { |
| while (depth.get() > 0) ; |
| assertEquals("Part inside suspension point should not be wrapped", 0, depth.get()) |
| "ignored" |
| }.await() |
| |
| result |
| } |
| |
| assertEquals("OK", future.get()) |
| } |
| |
| private fun wrapContinuation(wrapper: (() -> Unit) -> Unit): CoroutineDispatcher = object : CoroutineDispatcher() { |
| override fun dispatch(context: CoroutineContext, block: Runnable) { |
| wrapper { |
| block.run() |
| } |
| } |
| } |
| } |