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