1/*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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22 */
23
24/* @test
25 * @bug 4313887
26 * @summary Sanity test for JDK-specific sensitivity level watch event modifier
27 * @modules jdk.unsupported
28 * @library ..
29 * @run main/timeout=240 SensitivityModifier
30 * @key randomness
31 */
32
33import java.nio.file.*;
34import static java.nio.file.StandardWatchEventKinds.*;
35import java.io.OutputStream;
36import java.io.IOException;
37import java.util.Random;
38import java.util.concurrent.TimeUnit;
39import com.sun.nio.file.SensitivityWatchEventModifier;
40
41public class SensitivityModifier {
42
43    static final Random rand = new Random();
44
45    static void register(Path[] dirs, WatchService watcher) throws IOException {
46        SensitivityWatchEventModifier[] sensitivtives =
47            SensitivityWatchEventModifier.values();
48        for (int i=0; i<dirs.length; i++) {
49            SensitivityWatchEventModifier sensivity =
50                sensitivtives[ rand.nextInt(sensitivtives.length) ];
51            Path dir = dirs[i];
52            dir.register(watcher, new WatchEvent.Kind<?>[]{ ENTRY_MODIFY }, sensivity);
53        }
54    }
55
56    @SuppressWarnings("unchecked")
57    static void doTest(Path top) throws Exception {
58        FileSystem fs = top.getFileSystem();
59        try (WatchService watcher = fs.newWatchService()) {
60
61            // create directories and files
62            int nDirs = 5 + rand.nextInt(20);
63            int nFiles = 50 + rand.nextInt(50);
64            Path[] dirs = new Path[nDirs];
65            Path[] files = new Path[nFiles];
66            for (int i=0; i<nDirs; i++) {
67                dirs[i] = Files.createDirectory(top.resolve("dir" + i));
68            }
69            for (int i=0; i<nFiles; i++) {
70                Path dir = dirs[rand.nextInt(nDirs)];
71                files[i] = Files.createFile(dir.resolve("file" + i));
72            }
73
74            // register the directories (random sensitivity)
75            register(dirs, watcher);
76
77            // sleep a bit here to ensure that modification to the first file
78            // can be detected by polling implementations (ie: last modified time
79            // may not change otherwise).
80            try { Thread.sleep(1000); } catch (InterruptedException e) { }
81
82            // modify files and check that events are received
83            for (int i=0; i<10; i++) {
84                Path file = files[rand.nextInt(nFiles)];
85                System.out.println("Modify: " + file);
86                try (OutputStream out = Files.newOutputStream(file)) {
87                    out.write(new byte[100]);
88                }
89
90                System.out.println("Waiting for event(s)...");
91                boolean eventReceived = false;
92                WatchKey key = watcher.take();
93                do {
94                    for (WatchEvent<?> event: key.pollEvents()) {
95                        if (event.kind() != ENTRY_MODIFY)
96                            throw new RuntimeException("Unexpected event: " + event);
97                        Path name = ((WatchEvent<Path>)event).context();
98                        if (name.equals(file.getFileName())) {
99                            eventReceived = true;
100                            break;
101                        }
102                    }
103                    key.reset();
104                    key = watcher.poll(1, TimeUnit.SECONDS);
105                } while (key != null);
106
107                // we should have received at least one ENTRY_MODIFY event
108                if (eventReceived) {
109                    System.out.println("Event OK");
110                } else {
111                    throw new RuntimeException("No ENTRY_MODIFY event received for " + file);
112                }
113
114                // re-register the directories to force changing their sensitivity
115                // level
116                register(dirs, watcher);
117            }
118        }
119    }
120
121    public static void main(String[] args) throws Exception {
122        Path dir = TestUtil.createTemporaryDirectory();
123        try {
124            doTest(dir);
125        } finally {
126            TestUtil.removeAll(dir);
127        }
128    }
129}
130