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Add
awaitSubscribed() to test async sources (#1661)
Motivation: For some tests it is useful to be able to wait for the source being subscribed. The `subscribe()` may offloaded using the `subscribeOn()` operator and the thread which initiated the `subscribe()` regains control before the subscribe completes on the offloaded thread. `awaitSubscribed()` allows waiting until the subscribe is asynchronously completed. Modifications: Add `awaitSubscribed()` method to `TestCompletable`, `TestSingle`, and `TestPublisher`. Shared code is moved to new `AwaitUtils` class Result: Additional testing capability.
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113 changes: 113 additions & 0 deletions
113
...rrent-test-internal/src/main/java/io/servicetalk/concurrent/test/internal/AwaitUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| /* | ||
| * Copyright © 2021 Apple Inc. and the ServiceTalk project authors | ||
| * | ||
| * 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 io.servicetalk.concurrent.test.internal; | ||
|
|
||
| import java.util.concurrent.BlockingQueue; | ||
| import java.util.concurrent.CountDownLatch; | ||
| import java.util.concurrent.TimeUnit; | ||
| import javax.annotation.Nullable; | ||
|
|
||
| import static java.util.concurrent.TimeUnit.NANOSECONDS; | ||
|
|
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| public final class AwaitUtils { | ||
| private AwaitUtils() { | ||
| // no instances | ||
| } | ||
|
|
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| public static void awaitUninterruptibly(CountDownLatch latch) { | ||
| boolean interrupted = false; | ||
| try { | ||
| do { | ||
| try { | ||
| latch.await(); | ||
| return; | ||
| } catch (InterruptedException e) { | ||
| interrupted = true; | ||
| } | ||
| } while (true); | ||
| } finally { | ||
| if (interrupted) { | ||
| Thread.currentThread().interrupt(); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| public static boolean awaitUninterruptibly(CountDownLatch latch, long timeout, TimeUnit unit) { | ||
| final long startTime = System.nanoTime(); | ||
| final long timeoutNanos = NANOSECONDS.convert(timeout, unit); | ||
| long waitTime = timeoutNanos; | ||
| boolean interrupted = false; | ||
| try { | ||
| do { | ||
| try { | ||
| return latch.await(waitTime, NANOSECONDS); | ||
| } catch (InterruptedException e) { | ||
| interrupted = true; | ||
| } | ||
| waitTime = timeoutNanos - (System.nanoTime() - startTime); | ||
| if (waitTime <= 0) { | ||
| return true; | ||
| } | ||
| } while (true); | ||
| } finally { | ||
| if (interrupted) { | ||
| Thread.currentThread().interrupt(); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| public static <T> T takeUninterruptibly(BlockingQueue<T> queue) { | ||
| boolean interrupted = false; | ||
| try { | ||
| do { | ||
| try { | ||
| return queue.take(); | ||
| } catch (InterruptedException e) { | ||
| interrupted = true; | ||
| } | ||
| } while (true); | ||
| } finally { | ||
| if (interrupted) { | ||
| Thread.currentThread().interrupt(); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| @Nullable | ||
| public static <T> T pollUninterruptibly(BlockingQueue<T> queue, long timeout, TimeUnit unit) { | ||
| final long startTime = System.nanoTime(); | ||
| final long timeoutNanos = NANOSECONDS.convert(timeout, unit); | ||
| long waitTime = timeout; | ||
| boolean interrupted = false; | ||
| try { | ||
| do { | ||
| try { | ||
| return queue.poll(waitTime, NANOSECONDS); | ||
| } catch (InterruptedException e) { | ||
| interrupted = true; | ||
| } | ||
| waitTime = timeoutNanos - (System.nanoTime() - startTime); | ||
| if (waitTime <= 0) { | ||
| return null; | ||
| } | ||
| } while (true); | ||
| } finally { | ||
| if (interrupted) { | ||
| Thread.currentThread().interrupt(); | ||
| } | ||
| } | ||
| } | ||
| } |
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