| /* |
| * 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.channels |
| |
| import kotlinx.coroutines.experimental.* |
| import kotlin.coroutines.experimental.* |
| import kotlin.test.* |
| |
| class ConflatedChannelTest : TestBase() { |
| @Test |
| fun testBasicConflationOfferPoll() { |
| val q = ConflatedChannel<Int>() |
| assertNull(q.poll()) |
| assertTrue(q.offer(1)) |
| assertTrue(q.offer(2)) |
| assertTrue(q.offer(3)) |
| assertEquals(3, q.poll()) |
| assertNull(q.poll()) |
| } |
| |
| @Test |
| fun testConflatedSend() = runTest { |
| val q = ConflatedChannel<Int>() |
| q.send(1) |
| q.send(2) // shall conflated previously sent |
| assertEquals(2, q.receiveOrNull()) |
| } |
| |
| @Test |
| fun testConflatedClose() = runTest { |
| val q = ConflatedChannel<Int>() |
| q.send(1) |
| q.close() // shall conflate sent item and become closed |
| assertNull(q.receiveOrNull()) |
| } |
| |
| @Test |
| fun testConflationSendReceive() = runTest { |
| val q = ConflatedChannel<Int>() |
| expect(1) |
| launch(coroutineContext) { // receiver coroutine |
| expect(4) |
| assertEquals(2, q.receive()) |
| expect(5) |
| assertEquals(3, q.receive()) // this receive suspends |
| expect(8) |
| assertEquals(6, q.receive()) // last conflated value |
| expect(9) |
| } |
| expect(2) |
| q.send(1) |
| q.send(2) // shall conflate |
| expect(3) |
| yield() // to receiver |
| expect(6) |
| q.send(3) // send to the waiting receiver |
| q.send(4) // buffer |
| q.send(5) // conflate |
| q.send(6) // conflate again |
| expect(7) |
| yield() // to receiver |
| finish(10) |
| } |
| |
| @Test |
| fun testConsumeAll() = runTest { |
| val q = ConflatedChannel<Int>() |
| expect(1) |
| for (i in 1..10) { |
| q.send(i) // stores as last |
| } |
| q.cancel() |
| check(q.isClosedForSend) |
| check(q.isClosedForReceive) |
| check(q.receiveOrNull() == null) |
| finish(2) |
| } |
| |
| @Test |
| fun testCancelWithCause() = runTest({ it is TestException }) { |
| val channel = ConflatedChannel<Int>() |
| channel.cancel(TestException()) |
| channel.receiveOrNull() |
| } |
| |
| private class TestException : Exception() |
| } |