107 lines
3.8 KiB
Java
107 lines
3.8 KiB
Java
/*
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* Copyright (c) 2020, 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @summary Stress parking with CompletableFuture timed get
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* @requires vm.debug != true & vm.continuations
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* @run main/othervm -Xmx1g CompletableFutureTimedGet 100000
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*/
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import java.time.Duration;
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import java.time.Instant;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.CompletableFuture;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.atomic.AtomicInteger;
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public class CompletableFutureTimedGet {
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static final String RESULT = "foo";
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public static void main(String... args) throws InterruptedException {
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int threadCount = 250_000;
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if (args.length > 0) {
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threadCount = Integer.parseInt(args[0]);
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}
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// the count of the number of threads that complete successfully
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AtomicInteger completed = new AtomicInteger();
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// list of futures and threads
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List<CompletableFuture<String>> futures = new ArrayList<>();
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List<Thread> threads = new ArrayList<>();
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// start threads that wait with timeout for a result
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for (int i = 0; i < threadCount; i++) {
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var future = new CompletableFuture<String>();
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futures.add(future);
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// start a thread that uses a timed-get to wait for the result
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Thread thread = Thread.ofVirtual().start(() -> {
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try {
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String result = future.get(1, TimeUnit.DAYS);
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if (!RESULT.equals(result)) {
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throw new RuntimeException("result=" + result);
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}
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completed.incrementAndGet();
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} catch (Exception e) {
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e.printStackTrace();
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}
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});
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threads.add(thread);
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}
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// sets the result, which will unpark waiting threads
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futures.forEach(f -> f.complete(RESULT));
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// wait for all threads to terminate
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long lastTimestamp = System.currentTimeMillis();
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boolean done;
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do {
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done = true;
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for (Thread t : threads) {
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if (!t.join(Duration.ofSeconds(1))) {
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done = false;
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}
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}
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// print trace message so the output tracks progress
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long currentTime = System.currentTimeMillis();
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if (done || ((currentTime - lastTimestamp) > 500)) {
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System.out.format("%s => completed %d of %d%n",
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Instant.now(), completed.get(), threadCount);
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lastTimestamp = currentTime;
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}
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} while (!done);
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// all tasks should have completed successfully
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int completedCount = completed.get();
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if (completedCount != threadCount) {
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throw new RuntimeException("completed = " + completedCount);
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}
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}
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}
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