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ExecutorServiceRuleTest.java
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/
ExecutorServiceRuleTest.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more contributor license
* agreements. See the NOTICE file distributed with this work for additional information regarding
* copyright ownership. The ASF licenses this file to You 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 org.apache.geode.test.junit.rules;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;
import static org.assertj.core.api.Assertions.assertThat;
import static org.awaitility.Awaitility.await;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.Result;
import org.junit.runner.notification.Failure;
import org.apache.geode.test.junit.runners.TestRunner;
public class ExecutorServiceRuleTest {
private static volatile AtomicIntegerWithMaxValueSeen concurrentTasks;
private static volatile CountDownLatch hangLatch;
private static volatile CountDownLatch terminateLatch;
private static volatile ExecutorService executorService;
@Before
public void setUp() throws Exception {
concurrentTasks = new AtomicIntegerWithMaxValueSeen(0);
hangLatch = new CountDownLatch(1);
terminateLatch = new CountDownLatch(1);
}
@After
public void tearDown() throws Exception {
concurrentTasks = null;
while (hangLatch != null && hangLatch.getCount() > 0) {
hangLatch.countDown();;
}
if (executorService != null) {
executorService.shutdownNow();
executorService = null;
}
hangLatch = null;
terminateLatch = null;
}
@Test
public void providesExecutorService() throws Exception {
Result result = TestRunner.runTest(HasExecutorService.class);
assertThat(result.wasSuccessful()).isTrue();
assertThat(executorService).isInstanceOf(ExecutorService.class);
}
@Test
public void shutsDownAfterTest() throws Exception {
Result result = TestRunner.runTest(HasExecutorService.class);
assertThat(result.wasSuccessful()).isTrue();
assertThat(executorService.isShutdown()).isTrue();
}
@Test
public void terminatesAfterTest() throws Exception {
Result result = TestRunner.runTest(HasExecutorService.class);
assertThat(result.wasSuccessful()).isTrue();
assertThat(executorService.isTerminated()).isTrue();
}
@Test
public void shutsDownHungThread() throws Exception {
Result result = TestRunner.runTest(Hangs.class);
assertThat(result.wasSuccessful()).isTrue();
assertThat(isTestHung()).isTrue();
assertThat(executorService.isShutdown()).isTrue();
terminateLatch.await(10, SECONDS);
}
@Test
public void terminatesHungThread() throws Exception {
Result result = TestRunner.runTest(Hangs.class);
assertThat(result.wasSuccessful()).isTrue();
assertThat(isTestHung()).isTrue();
await().atMost(10, SECONDS)
.untilAsserted(() -> assertThat(executorService.isTerminated()).isTrue());
terminateLatch.await(1, SECONDS);
}
@Test
public void futureTimesOut() throws Exception {
Result result = TestRunner.runTest(TimesOut.class);
assertThat(result.wasSuccessful()).isFalse();
assertThat(result.getFailures()).hasSize(1);
Failure failure = result.getFailures().get(0);
assertThat(failure.getException()).isInstanceOf(TimeoutException.class);
}
@Test
public void singleThreadedByDefault() throws Exception {
terminateLatch = new CountDownLatch(2);
Result result = TestRunner.runTest(SingleThreaded.class);
assertThat(result.wasSuccessful()).as(result.toString()).isTrue();
assertThat(concurrentTasks.getMaxValueSeen()).isEqualTo(1);
}
@Test
public void threadCountTwoHasTwoThreads() throws Exception {
terminateLatch = new CountDownLatch(3);
Result result = TestRunner.runTest(ThreadCountTwo.class);
assertThat(result.wasSuccessful()).as(result.toString()).isTrue();
assertThat(concurrentTasks.getMaxValueSeen()).isEqualTo(2);
}
private static boolean isTestHung() {
return hangLatch.getCount() > 0;
}
public abstract static class HasAsynchronousRule {
@Rule
public ExecutorServiceRule executorServiceRule = new ExecutorServiceRule();
@Before
public void setUpHasAsynchronousRule() throws Exception {
executorService = executorServiceRule.getExecutorService();
}
}
public static class HasExecutorService extends HasAsynchronousRule {
@Test
public void doTest() throws Exception {
// nothing
}
}
public static class Hangs extends HasAsynchronousRule {
@Test
public void doTest() throws Exception {
executorServiceRule.runAsync(() -> {
try {
hangLatch.await();
} catch (InterruptedException e) {
throw new RuntimeException(e);
} finally {
terminateLatch.countDown();
}
});
}
}
public static class TimesOut extends HasAsynchronousRule {
@Test
public void doTest() throws Exception {
Future<?> future = executorServiceRule.runAsync(() -> {
try {
hangLatch.await();
} catch (InterruptedException e) {
throw new RuntimeException(e);
} finally {
terminateLatch.countDown();
}
});
future.get(1, MILLISECONDS);
}
}
public static class SingleThreaded extends HasAsynchronousRule {
private volatile CountDownLatch task1Latch;
private volatile CountDownLatch task2Latch;
private volatile CountDownLatch hang1Latch;
private volatile CountDownLatch hang2Latch;
@Before
public void setUp() throws Exception {
task1Latch = new CountDownLatch(1);
task2Latch = new CountDownLatch(1);
hang1Latch = new CountDownLatch(1);
hang2Latch = new CountDownLatch(1);
assertThat(terminateLatch.getCount()).isEqualTo(2);
}
@Test
public void doTest() throws Exception {
Future<Void> task1 = executorServiceRule.runAsync(() -> {
try {
task1Latch.countDown();
concurrentTasks.increment();
hang1Latch.await();
} catch (InterruptedException e) {
throw new RuntimeException(e);
} finally {
concurrentTasks.decrement();
terminateLatch.countDown();
}
});
// assert that task1 begins
task1Latch.await(30, SECONDS);
Future<Void> task2 = executorServiceRule.runAsync(() -> {
try {
task2Latch.countDown();
concurrentTasks.increment();
hang2Latch.await();
} catch (InterruptedException e) {
throw new RuntimeException(e);
} finally {
concurrentTasks.decrement();
terminateLatch.countDown();
}
});
// assert that there is only 1 thread in the default rule's ExecutorService
assertThat(task1Latch.getCount()).isEqualTo(0);
assertThat(task2Latch.getCount()).isEqualTo(1);
// assert that task1 completes
hang1Latch.countDown();
task1.get(30, SECONDS);
assertThat(terminateLatch.getCount()).isEqualTo(1);
// assert that task2 begins
task2Latch.await(30, SECONDS);
// assert that task2 completes
hang2Latch.countDown();
task2.get(30, SECONDS);
assertThat(terminateLatch.getCount()).isEqualTo(0);
}
}
public static class ThreadCountTwo {
private volatile CountDownLatch task1Latch;
private volatile CountDownLatch task2Latch;
private volatile CountDownLatch task3Latch;
private volatile CountDownLatch hang1Latch;
private volatile CountDownLatch hang2Latch;
private volatile CountDownLatch hang3Latch;
@Rule
public ExecutorServiceRule executorServiceRule =
ExecutorServiceRule.builder().threadCount(2).build();
@Before
public void setUp() throws Exception {
task1Latch = new CountDownLatch(1);
task2Latch = new CountDownLatch(1);
task3Latch = new CountDownLatch(1);
hang1Latch = new CountDownLatch(1);
hang2Latch = new CountDownLatch(1);
hang3Latch = new CountDownLatch(1);
assertThat(terminateLatch.getCount()).isEqualTo(3);
}
@Test
public void doTest() throws Exception {
Future<Void> task1 = executorServiceRule.runAsync(() -> {
try {
task1Latch.countDown();
concurrentTasks.increment();
hang1Latch.await();
} catch (InterruptedException e) {
throw new RuntimeException(e);
} finally {
concurrentTasks.decrement();
terminateLatch.countDown();
}
});
// assert that task1 begins
task1Latch.await(30, SECONDS);
Future<Void> task2 = executorServiceRule.runAsync(() -> {
try {
task2Latch.countDown();
concurrentTasks.increment();
hang2Latch.await();
} catch (InterruptedException e) {
throw new RuntimeException(e);
} finally {
concurrentTasks.decrement();
terminateLatch.countDown();
}
});
// assert that task2 begins
task2Latch.await(30, SECONDS);
Future<Void> task3 = executorServiceRule.runAsync(() -> {
try {
task3Latch.countDown();
concurrentTasks.increment();
hang3Latch.await();
} catch (InterruptedException e) {
throw new RuntimeException(e);
} finally {
concurrentTasks.decrement();
terminateLatch.countDown();
}
});
// assert that there are 2 threads in the rule's ExecutorService
assertThat(task1Latch.getCount()).isEqualTo(0);
assertThat(task2Latch.getCount()).isEqualTo(0);
assertThat(task3Latch.getCount()).isEqualTo(1);
// assert that task1 completes
hang1Latch.countDown();
task1.get(30, SECONDS);
assertThat(terminateLatch.getCount()).isEqualTo(2);
// assert that task3 begins
task3Latch.await(30, SECONDS);
// assert that task2 completes
hang2Latch.countDown();
task2.get(30, SECONDS);
assertThat(terminateLatch.getCount()).isEqualTo(1);
// assert that task3 completes
hang3Latch.countDown();
task3.get(30, SECONDS);
assertThat(terminateLatch.getCount()).isEqualTo(0);
}
}
static class AtomicIntegerWithMaxValueSeen extends AtomicInteger {
private int maxValueSeen = 0;
AtomicIntegerWithMaxValueSeen(int initialValue) {
super(initialValue);
}
void increment() {
maxValueSeen = Integer.max(maxValueSeen, super.incrementAndGet());
}
void decrement() {
super.decrementAndGet();
}
int getMaxValueSeen() {
return maxValueSeen;
}
}
}