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/*
* Copyright (c) 2020, 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @summary Test ForkJoinPool.shutdownNow with threads blocked in invokeXXX and Future.get
* @run junit AsyncShutdownNow
*/
import java.time.Duration;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.stream.Stream;
import static java.lang.Thread.State.*;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;
import static org.junit.jupiter.api.Assertions.*;
class AsyncShutdownNow {
// long running interruptible task
private static final Callable<Void> SLEEP_FOR_A_DAY = () -> {
Thread.sleep(Duration.ofDays(1));
return null;
};
static Stream<ForkJoinPool> pools() {
return Stream.of(
new ForkJoinPool(),
new ForkJoinPool(1)
);
}
/**
* Test shutdownNow with a running task and main thread blocked in Future::get.
*/
@ParameterizedTest
@MethodSource("pools")
void testFutureGet(ForkJoinPool pool) throws Exception {
try (pool) {
Future<?> future = pool.submit(SLEEP_FOR_A_DAY);
// shutdownNow when main thread waits in ForkJoinTask.awaitDone
onWait("java.util.concurrent.ForkJoinTask.awaitDone", pool::shutdownNow);
try {
future.get();
fail();
} catch (ExecutionException | CancellationException e) {
// expected
}
}
}
/**
* Test shutdownNow with a running task and main thread blocked in a timed Future::get.
*/
@ParameterizedTest
@MethodSource("pools")
void testTimedFutureGet(ForkJoinPool pool) throws Exception {
try (pool) {
Future<?> future = pool.submit(SLEEP_FOR_A_DAY);
// shutdownNow when main thread waits in ForkJoinTask.awaitDone
onWait("java.util.concurrent.ForkJoinTask.awaitDone", pool::shutdownNow);
try {
future.get(1, TimeUnit.HOURS);
fail();
} catch (ExecutionException | CancellationException e) {
// expected
}
}
}
/**
* Test shutdownNow with running tasks and main thread blocked in invokeAll.
*/
@ParameterizedTest
@MethodSource("pools")
void testInvokeAll(ForkJoinPool pool) throws Exception {
try (pool) {
// shutdownNow when main thread waits in ForkJoinTask.awaitDone
onWait("java.util.concurrent.ForkJoinTask.awaitDone", pool::shutdownNow);
List<Future<Void>> futures = pool.invokeAll(List.of(SLEEP_FOR_A_DAY, SLEEP_FOR_A_DAY));
for (Future<Void> f : futures) {
assertTrue(f.isDone());
try {
Object result = f.get();
fail();
} catch (ExecutionException | CancellationException e) {
// expected
}
}
}
}
/**
* Test shutdownNow with running tasks and main thread blocked in invokeAny.
*/
@ParameterizedTest
@MethodSource("pools")
void testInvokeAny(ForkJoinPool pool) throws Exception {
try (pool) {
// shutdownNow when main thread waits in ForkJoinTask.get
onWait("java.util.concurrent.ForkJoinTask.get", pool::shutdownNow);
try {
pool.invokeAny(List.of(SLEEP_FOR_A_DAY, SLEEP_FOR_A_DAY));
fail();
} catch (ExecutionException e) {
// expected
}
}
}
/**
* Runs the given action when the current thread is sampled as waiting (timed or
* untimed) at the given location. The location takes the form "{@code c.m}" where
* {@code c} is the fully qualified class name and {@code m} is the method name.
*/
private void onWait(String location, Runnable action) {
int index = location.lastIndexOf('.');
String className = location.substring(0, index);
String methodName = location.substring(index + 1);
Thread target = Thread.currentThread();
var thread = new Thread(() -> {
try {
boolean found = false;
while (!found) {
Thread.State state = target.getState();
assertTrue(state != TERMINATED);
if ((state == WAITING || state == TIMED_WAITING)
&& contains(target.getStackTrace(), className, methodName)) {
found = true;
} else {
Thread.sleep(20);
}
}
action.run();
} catch (Exception e) {
e.printStackTrace();
}
});
thread.setDaemon(true);
thread.start();
}
/**
* Returns true if the given stack trace contains an element for the given class
* and method name.
*/
private boolean contains(StackTraceElement[] stack, String className, String methodName) {
return Arrays.stream(stack)
.anyMatch(e -> className.equals(e.getClassName())
&& methodName.equals(e.getMethodName()));
}
}
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