| /* |
| * Copyright (c) 2016, 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 8148192 |
| * @summary Invoking close asynchronously can cause register to fail with |
| * an IOException rather than a ClosedWatchServiceException |
| * @run main LotsOfCloses |
| */ |
| |
| import java.io.IOException; |
| import java.io.UncheckedIOException; |
| import java.nio.file.ClosedWatchServiceException; |
| import java.nio.file.FileSystems; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.StandardWatchEventKinds; |
| import java.nio.file.WatchService; |
| import java.util.Random; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.Future; |
| |
| public class LotsOfCloses { |
| |
| private static final Random RAND = new Random(); |
| |
| public static void main(String[] args) throws Exception { |
| Path dir = Files.createTempDirectory("tmp"); |
| ExecutorService pool = Executors.newCachedThreadPool(); |
| try { |
| |
| // run the test repeatedly |
| long start = System.currentTimeMillis(); |
| while ((System.currentTimeMillis() - start) < 5000) { |
| test(dir, pool); |
| } |
| |
| } finally { |
| pool.shutdown(); |
| } |
| |
| } |
| |
| /** |
| * Create a WatchService to watch for changes in the given directory |
| * and then attempt to close the WatchService and change a registration |
| * at the same time. |
| */ |
| static void test(Path dir, ExecutorService pool) throws Exception { |
| WatchService watcher = FileSystems.getDefault().newWatchService(); |
| |
| // initial registration |
| dir.register(watcher, StandardWatchEventKinds.ENTRY_CREATE); |
| |
| // submit tasks to close the WatchService and update the registration |
| Future<Void> closeResult; |
| Future<Boolean> registerResult; |
| |
| if (RAND.nextBoolean()) { |
| closeResult = pool.submit(newCloserTask(watcher)); |
| registerResult = pool.submit(newRegisterTask(watcher, dir)); |
| } else { |
| registerResult = pool.submit(newRegisterTask(watcher, dir)); |
| closeResult = pool.submit(newCloserTask(watcher)); |
| } |
| |
| closeResult.get(); |
| registerResult.get(); |
| |
| } |
| |
| /** |
| * Returns a task that closes the given WatchService. |
| */ |
| static Callable<Void> newCloserTask(WatchService watcher) { |
| return () -> { |
| try { |
| watcher.close(); |
| return null; |
| } catch (IOException ioe) { |
| throw new UncheckedIOException(ioe); |
| } |
| }; |
| } |
| |
| /** |
| * Returns a task that updates the registration of a directory with |
| * a WatchService. |
| */ |
| static Callable<Boolean> newRegisterTask(WatchService watcher, Path dir) { |
| return () -> { |
| try { |
| dir.register(watcher, StandardWatchEventKinds.ENTRY_DELETE); |
| return true; |
| } catch (ClosedWatchServiceException e) { |
| return false; |
| } catch (IOException ioe) { |
| throw new UncheckedIOException(ioe); |
| } |
| }; |
| } |
| } |