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.assertFalse;
46 import static org.junit.Assert.assertTrue;
47
48 import java.io.File;
49 import java.io.FileOutputStream;
50 import java.io.IOException;
51 import java.util.ArrayList;
52 import java.util.List;
53
54 import org.eclipse.jgit.internal.storage.file.FileSnapshot;
55 import org.eclipse.jgit.util.FileUtils;
56 import org.junit.After;
57 import org.junit.Before;
58 import org.junit.Test;
59
60 public class FileSnapshotTest {
61
62 private List<File> files = new ArrayList<File>();
63
64 private File trash;
65
66 @Before
67 public void setUp() throws Exception {
68 trash = File.createTempFile("tmp_", "");
69 trash.delete();
70 assertTrue("mkdir " + trash, trash.mkdir());
71 }
72
73 @Before
74 @After
75 public void tearDown() throws Exception {
76 FileUtils.delete(trash, FileUtils.RECURSIVE | FileUtils.SKIP_MISSING);
77 }
78
79 private static void waitNextSec(File f) {
80 long initialLastModified = f.lastModified();
81 do {
82 f.setLastModified(System.currentTimeMillis());
83 } while (f.lastModified() == initialLastModified);
84 }
85
86 /**
87 * Change data and time stamp.
88 *
89 * @throws Exception
90 */
91 @Test
92 public void testActuallyIsModifiedTrivial() throws Exception {
93 File f1 = createFile("simple");
94 waitNextSec(f1);
95 FileSnapshot save = FileSnapshot.save(f1);
96 append(f1, (byte) 'x');
97 waitNextSec(f1);
98 assertTrue(save.isModified(f1));
99 }
100
101 /**
102 * Create a file, wait long enough and verify that it has not been modified.
103 * 3.5 seconds mean any difference between file system timestamp and system
104 * clock should be significant.
105 *
106 * @throws Exception
107 */
108 @Test
109 public void testOldFile() throws Exception {
110 File f1 = createFile("oldfile");
111 waitNextSec(f1);
112 FileSnapshot save = FileSnapshot.save(f1);
113 Thread.sleep(3500);
114 assertFalse(save.isModified(f1));
115 }
116
117 /**
118 * Create a file, but don't wait long enough for the difference between file
119 * system clock and system clock to be significant. Assume the file may have
120 * been modified. It may have been, but the clock alone cannot determine
121 * this
122 *
123 * @throws Exception
124 */
125 @Test
126 public void testNewFileWithWait() throws Exception {
127 File f1 = createFile("newfile");
128 waitNextSec(f1);
129 FileSnapshot save = FileSnapshot.save(f1);
130 Thread.sleep(1500);
131 assertTrue(save.isModified(f1));
132 }
133
134 /**
135 * Same as {@link #testNewFileWithWait()} but do not wait at all
136 *
137 * @throws Exception
138 */
139 @Test
140 public void testNewFileNoWait() throws Exception {
141 File f1 = createFile("newfile");
142 waitNextSec(f1);
143 FileSnapshot save = FileSnapshot.save(f1);
144 Thread.sleep(1500);
145 assertTrue(save.isModified(f1));
146 }
147
148 private File createFile(String string) throws IOException {
149 trash.mkdirs();
150 File f = File.createTempFile(string, "tdat", trash);
151 files.add(f);
152 return f;
153 }
154
155 private static void append(File f, byte b) throws IOException {
156 FileOutputStream os = new FileOutputStream(f, true);
157 try {
158 os.write(b);
159 } finally {
160 os.close();
161 }
162 }
163
164 }