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/*
* Copyright (c) 2023, 2025, 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 Stress test of StructuredTaskScope cancellation with running and starting threads
* @enablePreview
* @run junit StressCancellation
*/
import java.time.Duration;
import java.util.concurrent.StructuredTaskScope;
import java.util.concurrent.StructuredTaskScope.Joiner;
import java.util.concurrent.StructuredTaskScope.Subtask;
import java.util.concurrent.ThreadFactory;
import java.util.stream.IntStream;
import java.util.stream.Stream;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;
import static org.junit.jupiter.api.Assertions.*;
class StressCancellation {
static Stream<Arguments> testCases() {
Stream<ThreadFactory> factories = Stream.of(
Thread.ofPlatform().factory(),
Thread.ofVirtual().factory()
);
// 0..15 forks before shutdown, 0..15 forks after shutdown
return factories.flatMap(f -> IntStream.range(0, 256)
.mapToObj(x -> Arguments.of(f, x & 0x0F, (x & 0xF0) >> 4)));
}
/**
* Test StructuredTaskScope cancellation with running threads and concurrently with
* threads that are starting. The cancellation should interrupt all running threads,
* join should wakeup, and close would complete quickly.
*
* @param factory the ThreadFactory to use
* @param beforeCancel the number of subtasks to fork before cancel
* @param afterCancel the number of subtasks to fork after cancel
*/
@ParameterizedTest
@MethodSource("testCases")
void test(ThreadFactory factory, int beforeCancel, int afterCancel) throws Exception {
var joiner = new Joiner<Boolean, Void>() {
@Override
public boolean onComplete(Subtask<? extends Boolean> subtask) {
boolean cancel = subtask.get();
return cancel;
}
@Override
public Void result() {
return null;
}
};
try (var scope = StructuredTaskScope.open(joiner, cf -> cf.withThreadFactory(factory))) {
// fork subtasks
for (int i = 0; i < beforeCancel; i++) {
scope.fork(() -> {
Thread.sleep(Duration.ofDays(1));
return false;
});
}
// fork subtask to cancel
scope.fork(() -> true);
// fork after forking subtask to cancel
for (int i = 0; i < afterCancel; i++) {
scope.fork(() -> {
Thread.sleep(Duration.ofDays(1));
return false;
});
}
scope.join();
}
}
}
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