| /* |
| * Copyright (c) 2016, Red Hat, Inc. and/or its affiliates. |
| * 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 8153925 |
| * @summary Tests potential interference between a thread creating and closing |
| * a WatchService with another thread that is deleting and re-creating the |
| * directory at around the same time. This scenario tickled a timing bug |
| * in the Windows implementation. |
| */ |
| |
| import java.io.IOException; |
| import java.nio.file.DirectoryStream; |
| import java.nio.file.FileSystem; |
| import java.nio.file.FileSystems; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| import java.nio.file.WatchService; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.Future; |
| |
| import static java.lang.System.out; |
| import static java.nio.file.StandardWatchEventKinds.*; |
| |
| public class DeleteInterference { |
| |
| private static final int ITERATIONS_COUNT = 1024; |
| |
| /** |
| * Execute two tasks in a thread pool. One task loops on creating and |
| * closing a WatchService, the other task deletes and re-creates the |
| * directory. |
| */ |
| public static void main(String[] args) throws Exception { |
| Path testDir = Paths.get(System.getProperty("test.dir", ".")); |
| Path dir = Files.createTempDirectory(testDir, "DeleteInterference"); |
| ExecutorService pool = Executors.newCachedThreadPool(); |
| try { |
| Future<?> task1 = pool.submit(() -> openAndCloseWatcher(dir)); |
| Future<?> task2 = pool.submit(() -> deleteAndRecreateDirectory(dir)); |
| task1.get(); |
| task2.get(); |
| } finally { |
| pool.shutdown(); |
| } |
| } |
| |
| private static void openAndCloseWatcher(Path dir) { |
| FileSystem fs = FileSystems.getDefault(); |
| for (int i = 0; i < ITERATIONS_COUNT; i++) { |
| out.printf("open %d begin%n", i); |
| try (WatchService watcher = fs.newWatchService()) { |
| dir.register(watcher, ENTRY_CREATE, ENTRY_DELETE, ENTRY_MODIFY); |
| } catch (IOException ioe) { |
| // ignore |
| } finally { |
| out.printf("open %d end%n", i); |
| } |
| } |
| } |
| |
| private static void deleteAndRecreateDirectory(Path dir) { |
| for (int i = 0; i < ITERATIONS_COUNT; i++) { |
| out.printf("del %d begin%n", i); |
| try { |
| deleteFileTree(dir); |
| Path subdir = Files.createDirectories(dir.resolve("subdir")); |
| Files.createFile(subdir.resolve("test")); |
| } catch (IOException ioe) { |
| // ignore |
| } finally { |
| out.printf("del %d end%n", i); |
| } |
| } |
| } |
| |
| private static void deleteFileTree(Path file) { |
| try { |
| if (Files.isDirectory(file)) { |
| try (DirectoryStream<Path> stream = Files.newDirectoryStream(file)) { |
| for (Path pa : stream) { |
| deleteFileTree(pa); |
| } |
| } |
| } |
| Files.delete(file); |
| } catch (IOException ioe) { |
| // ignore |
| } |
| } |
| } |