1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
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   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  *
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  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
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  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 
  33 import java.nio.file.*;
  34 import static java.nio.file.StandardWatchEventKinds.*;
  35 import java.io.OutputStream;
  36 import java.io.IOException;
  37 import java.util.Random;
  38 import java.util.concurrent.TimeUnit;
  39 import com.sun.nio.file.SensitivityWatchEventModifier;
  40 
  41 public 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 }