test/jdk/java/util/concurrent/ConcurrentHashMap/ToArray.java - master - githubmirror/jdk11u-dev

test/jdk/java/util/concurrent/ConcurrentHashMap/ToArray.java
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Andrew Lu
8269428: java/util/concurrent/ConcurrentHashMap/ToArray.java timed out
25 июн 2024, 08:43
25 июн 2024, 08:433b4f583
/*
 * Copyright (c) 2004, 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
 * @bug 4486658 8010293
 * @summary thread safety of toArray methods of subCollections
 * @author Martin Buchholz
 */

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.stream.IntStream;

public class ToArray {

    public static void main(String[] args) throws Throwable {
        // Execute a number of times to increase the probability of
        // failure if there is an issue
        for (int i = 0; i < 16; i++) {
            executeTest();
        }
    }

    static void executeTest() throws Throwable {
        ExecutorService executor = Executors.newCachedThreadPool();
        try {
            final Throwable[] throwable = new Throwable[1];
            final ConcurrentHashMap<Integer, Integer> m = new ConcurrentHashMap<>();

            // Number of workers equal to the number of processors
            // Each worker will put globally unique keys into the map
            final int nWorkers = Runtime.getRuntime().availableProcessors();
            final int sizePerWorker = 1024;
            final int maxSize = nWorkers * sizePerWorker;

            // The foreman keeps checking that the size of the arrays
            // obtained from the key and value sets is never less than the
            // previously observed size and is never greater than the maximum size
            // NOTE: these size constraints are not specific to toArray and are
            // applicable to any form of traversal of the collection views
            CompletableFuture<?> foreman = CompletableFuture.runAsync(new Runnable() {
                private int prevSize = 0;

                private boolean checkProgress(Object[] a) {
                    int size = a.length;
                    if (size < prevSize) throw new RuntimeException("WRONG WAY");
                    if (size > maxSize) throw new RuntimeException("OVERSHOOT");
                    if (size == maxSize) return true;
                    prevSize = size;
                    return false;
                }

                @Override
                public void run() {
                    try {
                        Integer[] empty = new Integer[0];
                        while (true) {
                            if (checkProgress(m.values().toArray())) return;
                            if (checkProgress(m.keySet().toArray())) return;
                            if (checkProgress(m.values().toArray(empty))) return;
                            if (checkProgress(m.keySet().toArray(empty))) return;
                        }
                    } catch (Throwable t) {
                        throwable[0] = t;
                    }
                }
            }, executor);

            // Create workers
            // Each worker will put globally unique keys into the map
            CompletableFuture<?>[] workers = IntStream.range(0, nWorkers).
                    mapToObj(w -> CompletableFuture.runAsync(() -> {
                        for (int i = 0, o = w * sizePerWorker; i < sizePerWorker; i++)
                            m.put(o + i, i);
                    }, executor)).
                    toArray(CompletableFuture<?>[]::new);

            // Wait for workers and then foreman to complete
            CompletableFuture.allOf(workers).join();
            foreman.join();

            if (throwable[0] != null)
                throw throwable[0];
        } finally {
            executor.shutdownNow();
        }
    }
}