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