1 /*
2 * Copyright (C) 2010, Robin Rosenberg
3 * and other copyright owners as documented in the project's IP log.
4 *
5 * This program and the accompanying materials are made available
6 * under the terms of the Eclipse Distribution License v1.0 which
7 * accompanies this distribution, is reproduced below, and is
8 * available at http://www.eclipse.org/org/documents/edl-v10.php
9 *
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials provided
22 * with the distribution.
23 *
24 * - Neither the name of the Eclipse Foundation, Inc. nor the
25 * names of its contributors may be used to endorse or promote
26 * products derived from this software without specific prior
27 * written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
30 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
31 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
34 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
35 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
37 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
38 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
41 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 */
43 package org.eclipse.jgit.internal.storage.file;
44
45 import static org.junit.Assert.assertTrue;
46
47 import java.io.File;
48 import java.io.FileOutputStream;
49 import java.io.IOException;
50 import java.util.ArrayList;
51 import java.util.List;
52
53 import org.eclipse.jgit.util.FileUtils;
54 import org.junit.After;
55 import org.junit.Before;
56 import org.junit.Test;
57
58 public class FileSnapshotTest {
59
60 private List<File> files = new ArrayList<File>();
61
62 private File trash;
63
64 @Before
65 public void setUp() throws Exception {
66 trash = File.createTempFile("tmp_", "");
67 trash.delete();
68 assertTrue("mkdir " + trash, trash.mkdir());
69 }
70
71 @Before
72 @After
73 public void tearDown() throws Exception {
74 FileUtils.delete(trash, FileUtils.RECURSIVE | FileUtils.SKIP_MISSING);
75 }
76
77 private static void waitNextSec(File f) {
78 long initialLastModified = f.lastModified();
79 do {
80 f.setLastModified(System.currentTimeMillis());
81 } while (f.lastModified() == initialLastModified);
82 }
83
84 /**
85 * Change data and time stamp.
86 *
87 * @throws Exception
88 */
89 @Test
90 public void testActuallyIsModifiedTrivial() throws Exception {
91 File f1 = createFile("simple");
92 waitNextSec(f1);
93 FileSnapshot save = FileSnapshot.save(f1);
94 append(f1, (byte) 'x');
95 waitNextSec(f1);
96 assertTrue(save.isModified(f1));
97 }
98
99 /**
100 * Create a file, but don't wait long enough for the difference between file
101 * system clock and system clock to be significant. Assume the file may have
102 * been modified. It may have been, but the clock alone cannot determine
103 * this
104 *
105 * @throws Exception
106 */
107 @Test
108 public void testNewFileWithWait() throws Exception {
109 File f1 = createFile("newfile");
110 waitNextSec(f1);
111 FileSnapshot save = FileSnapshot.save(f1);
112 Thread.sleep(1500);
113 assertTrue(save.isModified(f1));
114 }
115
116 /**
117 * Same as {@link #testNewFileWithWait()} but do not wait at all
118 *
119 * @throws Exception
120 */
121 @Test
122 public void testNewFileNoWait() throws Exception {
123 File f1 = createFile("newfile");
124 waitNextSec(f1);
125 FileSnapshot save = FileSnapshot.save(f1);
126 Thread.sleep(1500);
127 assertTrue(save.isModified(f1));
128 }
129
130 private File createFile(String string) throws IOException {
131 trash.mkdirs();
132 File f = File.createTempFile(string, "tdat", trash);
133 files.add(f);
134 return f;
135 }
136
137 private static void append(File f, byte b) throws IOException {
138 FileOutputStream os = new FileOutputStream(f, true);
139 try {
140 os.write(b);
141 } finally {
142 os.close();
143 }
144 }
145
146 }