1/*
2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/*
25 * @test
26 * @bug 6631352
27 * @summary Check that appends are atomic
28 */
29
30import java.io.File;
31import java.io.FileOutputStream;
32import java.util.concurrent.Executors;
33import java.util.concurrent.ExecutorService;
34import java.util.concurrent.TimeUnit;
35
36public class AtomicAppend {
37    // Before the fix for
38    // 6631352: Implement atomic append mode using FILE_APPEND_DATA (win)
39    // this would fail intermittently on windows
40    void test(String[] args) throws Throwable {
41        final int nThreads = 10;
42        final int writes = 1000;
43        final File file = new File("foo");
44        file.delete();
45        try {
46            final ExecutorService es = Executors.newFixedThreadPool(nThreads);
47            for (int i = 0; i < nThreads; i++)
48                es.execute(new Runnable() { public void run() {
49                    try {
50                        try (FileOutputStream s = new FileOutputStream(file, true)) {
51                            for (int j = 0; j < 1000; j++) {
52                                s.write((int) 'x');
53                                s.flush();
54                            }
55                        }
56                    } catch (Throwable t) { unexpected(t); }}});
57            es.shutdown();
58            es.awaitTermination(10L, TimeUnit.MINUTES);
59            equal(file.length(), (long) (nThreads * writes));
60        } finally {
61            file.delete();
62        }
63    }
64
65    //--------------------- Infrastructure ---------------------------
66    volatile int passed = 0, failed = 0;
67    void pass() {passed++;}
68    void fail() {failed++; Thread.dumpStack();}
69    void fail(String msg) {System.err.println(msg); fail();}
70    void unexpected(Throwable t) {failed++; t.printStackTrace();}
71    void check(boolean cond) {if (cond) pass(); else fail();}
72    void equal(Object x, Object y) {
73        if (x == null ? y == null : x.equals(y)) pass();
74        else fail(x + " not equal to " + y);}
75    public static void main(String[] args) throws Throwable {
76        new AtomicAppend().instanceMain(args);}
77    void instanceMain(String[] args) throws Throwable {
78        try {test(args);} catch (Throwable t) {unexpected(t);}
79        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
80        if (failed > 0) throw new AssertionError("Some tests failed");}
81}
82