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/*
* Copyright (c) 2020, 2024, 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 parking with CompletableFuture timed get
* @requires vm.debug != true & vm.continuations
* @run main/othervm -Xmx1g CompletableFutureTimedGet 100000
*/
import java.time.Duration;
import java.time.Instant;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
public class CompletableFutureTimedGet {
static final String RESULT = "foo";
public static void main(String... args) throws InterruptedException {
int threadCount = 250_000;
if (args.length > 0) {
threadCount = Integer.parseInt(args[0]);
}
// the count of the number of threads that complete successfully
AtomicInteger completed = new AtomicInteger();
// list of futures and threads
List<CompletableFuture<String>> futures = new ArrayList<>();
List<Thread> threads = new ArrayList<>();
// start threads that wait with timeout for a result
for (int i = 0; i < threadCount; i++) {
var future = new CompletableFuture<String>();
futures.add(future);
// start a thread that uses a timed-get to wait for the result
Thread thread = Thread.ofVirtual().start(() -> {
try {
String result = future.get(1, TimeUnit.DAYS);
if (!RESULT.equals(result)) {
throw new RuntimeException("result=" + result);
}
completed.incrementAndGet();
} catch (Exception e) {
e.printStackTrace();
}
});
threads.add(thread);
}
// sets the result, which will unpark waiting threads
futures.forEach(f -> f.complete(RESULT));
// wait for all threads to terminate
long lastTimestamp = System.currentTimeMillis();
boolean done;
do {
done = true;
for (Thread t : threads) {
if (!t.join(Duration.ofSeconds(1))) {
done = false;
}
}
// print trace message so the output tracks progress
long currentTime = System.currentTimeMillis();
if (done || ((currentTime - lastTimestamp) > 500)) {
System.out.format("%s => completed %d of %d%n",
Instant.now(), completed.get(), threadCount);
lastTimestamp = currentTime;
}
} while (!done);
// all tasks should have completed successfully
int completedCount = completed.get();
if (completedCount != threadCount) {
throw new RuntimeException("completed = " + completedCount);
}
}
}
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