1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
|
package org.eclipse.jetty.util;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import org.eclipse.jetty.toolchain.test.OS;
import org.eclipse.jetty.util.Scanner.Notification;
import org.junit.AfterClass;
import org.junit.Assert;
import org.junit.Assume;
import org.junit.BeforeClass;
import org.junit.Test;
public class ScannerTest
{
static File _directory;
static Scanner _scanner;
static BlockingQueue<Event> _queue = new LinkedBlockingQueue<Event>();
static BlockingQueue<List<String>> _bulk = new LinkedBlockingQueue<List<String>>();
@BeforeClass
public static void setUpBeforeClass() throws Exception
{
_directory = File.createTempFile("scan","");
_directory.delete();
_directory.mkdir();
_directory.deleteOnExit();
_scanner = new Scanner();
_scanner.addScanDir(_directory);
_scanner.setScanInterval(0);
_scanner.addListener(new Scanner.DiscreteListener()
{
public void fileRemoved(String filename) throws Exception
{
_queue.add(new Event(filename,Notification.REMOVED));
}
public void fileChanged(String filename) throws Exception
{
_queue.add(new Event(filename,Notification.CHANGED));
}
public void fileAdded(String filename) throws Exception
{
_queue.add(new Event(filename,Notification.ADDED));
}
});
_scanner.addListener(new Scanner.BulkListener()
{
public void filesChanged(List<String> filenames) throws Exception
{
_bulk.add(filenames);
}
});
_scanner.start();
_scanner.scan();
Assert.assertTrue(_queue.isEmpty());
Assert.assertTrue(_bulk.isEmpty());
}
@AfterClass
public static void tearDownAfterClass() throws Exception
{
_scanner.stop();
IO.delete(_directory);
}
static class Event
{
String _filename;
Scanner.Notification _notification;
public Event(String filename, Notification notification)
{
_filename=filename;
_notification=notification;
}
}
@Test
public void testAddedChangeRemove() throws Exception
{
Assume.assumeTrue(!OS.IS_WINDOWS && !OS.IS_OSX);
touch("a0");
// takes 2 scans to notice a0 and check that it is stable
_scanner.scan();
_scanner.scan();
Event event = _queue.poll();
Assert.assertTrue(event!=null);
Assert.assertEquals(_directory+"/a0",event._filename);
Assert.assertEquals(Notification.ADDED,event._notification);
// add 3 more files
Thread.sleep(1100); // make sure time in seconds changes
touch("a1");
touch("a2");
touch("a3");
// not stable after 1 scan so should not be seen yet.
_scanner.scan();
event = _queue.poll();
Assert.assertTrue(event==null);
// Keep a2 unstable and remove a3 before it stabalized
Thread.sleep(1100); // make sure time in seconds changes
touch("a2");
delete("a3");
// only a1 is stable so it should be seen.
_scanner.scan();
event = _queue.poll();
Assert.assertTrue(event!=null);
Assert.assertEquals(_directory+"/a1",event._filename);
Assert.assertEquals(Notification.ADDED,event._notification);
Assert.assertTrue(_queue.isEmpty());
// Now a2 is stable
_scanner.scan();
event = _queue.poll();
Assert.assertTrue(event!=null);
Assert.assertEquals(_directory+"/a2",event._filename);
Assert.assertEquals(Notification.ADDED,event._notification);
Assert.assertTrue(_queue.isEmpty());
// We never see a3 as it was deleted before it stabalised
// touch a1 and a2
Thread.sleep(1100); // make sure time in seconds changes
touch("a1");
touch("a2");
// not stable after 1scan so nothing should not be seen yet.
_scanner.scan();
event = _queue.poll();
Assert.assertTrue(event==null);
// Keep a2 unstable
Thread.sleep(1100); // make sure time in seconds changes
touch("a2");
// only a1 is stable so it should be seen.
_scanner.scan();
event = _queue.poll();
Assert.assertTrue(event!=null);
Assert.assertEquals(_directory+"/a1",event._filename);
Assert.assertEquals(Notification.CHANGED,event._notification);
Assert.assertTrue(_queue.isEmpty());
// Now a2 is stable
_scanner.scan();
event = _queue.poll();
Assert.assertTrue(event!=null);
Assert.assertEquals(_directory+"/a2",event._filename);
Assert.assertEquals(Notification.CHANGED,event._notification);
Assert.assertTrue(_queue.isEmpty());
// delete a1 and a2
delete("a1");
delete("a2");
// not stable after 1scan so nothing should not be seen yet.
_scanner.scan();
event = _queue.poll();
Assert.assertTrue(event==null);
// readd a2
touch("a2");
// only a1 is stable so it should be seen.
_scanner.scan();
event = _queue.poll();
Assert.assertTrue(event!=null);
Assert.assertEquals(_directory+"/a1",event._filename);
Assert.assertEquals(Notification.REMOVED,event._notification);
Assert.assertTrue(_queue.isEmpty());
// Now a2 is stable and is a changed file rather than a remove
_scanner.scan();
event = _queue.poll();
Assert.assertTrue(event!=null);
Assert.assertEquals(_directory+"/a2",event._filename);
Assert.assertEquals(Notification.CHANGED,event._notification);
Assert.assertTrue(_queue.isEmpty());
}
@Test
public void testSizeChange() throws Exception
{
Assume.assumeTrue(!OS.IS_WINDOWS && !OS.IS_OSX);
touch("tsc0");
_scanner.scan();
_scanner.scan();
// takes 2s to notice tsc0 and check that it is stable. This syncs us with the scan
Event event = _queue.poll();
Assert.assertTrue(event!=null);
Assert.assertEquals(_directory+"/tsc0",event._filename);
Assert.assertEquals(Notification.ADDED,event._notification);
// Create a new file by writing to it.
long now = System.currentTimeMillis();
File file = new File(_directory,"st");
FileOutputStream out = new FileOutputStream(file,true);
out.write('x');
out.flush();
file.setLastModified(now);
// Not stable yet so no notification.
_scanner.scan();
event = _queue.poll();
Assert.assertTrue(event==null);
// Modify size only
out.write('x');
out.flush();
file.setLastModified(now);
// Still not stable yet so no notification.
_scanner.scan();
event = _queue.poll();
Assert.assertTrue(event==null);
// now stable so finally see the ADDED
_scanner.scan();
event = _queue.poll();
Assert.assertTrue(event!=null);
Assert.assertEquals(_directory+"/st",event._filename);
Assert.assertEquals(Notification.ADDED,event._notification);
// Modify size only
out.write('x');
out.flush();
file.setLastModified(now);
// Still not stable yet so no notification.
_scanner.scan();
event = _queue.poll();
Assert.assertTrue(event==null);
// now stable so finally see the ADDED
_scanner.scan();
event = _queue.poll();
Assert.assertTrue(event!=null);
Assert.assertEquals(_directory+"/st",event._filename);
Assert.assertEquals(Notification.CHANGED,event._notification);
}
private void delete(String string) throws IOException
{
File file = new File(_directory,string);
if (file.exists())
IO.delete(file);
}
private void touch(String string) throws IOException
{
File file = new File(_directory,string);
if (file.exists())
file.setLastModified(System.currentTimeMillis());
else
file.createNewFile();
}
}
|
