Examples of org.syncany.operations.watch.DefaultRecursiveWatcher

org.syncany.operations.watch.DefaultRecursiveWatcher
The default recursive file watcher monitors a folder (and its sub-folders) by registering a watch on each of the sub-folders. This class is used on Linux/Unix-based operating systems and uses the Java 7 {@link WatchService}.
The class walks through the file tree and registers to a watch to every sub-folder. For new folders, a new watch is registered, and stale watches are removed.
When a file event occurs, a timer is started to wait for the file operations to settle. It is reset whenever a new event occurs. When the timer times out, an event is thrown through the {@link WatchListener}. @author Philipp C. Heckel

    TestFileUtil.createRandomFilesInDirectory(tempDir, 50*1024, 20);    
    
    // Test
    final AtomicBoolean eventOccurred = new AtomicBoolean(false);
    
    DefaultRecursiveWatcher watcher = new DefaultRecursiveWatcher(Paths.get(tempDir.getAbsolutePath()), new ArrayList<Path>(), 300, new WatchListener() {
      @Override
      public void watchEventsOccurred() {
        eventOccurred.set(true);
      }      
    });
    
    // Start watcher and wait for watch service to set watch on all folders
    watcher.start();    
    Thread.sleep(100);
    
    // Event 1 
    TestFileUtil.createRandomFileInDirectory(tempDir, 10);
    assertFalse(eventOccurred.get());


    Thread.sleep(550);
    assertTrue(eventOccurred.get());


    // Stop watcher (close watches)
    watcher.stop();
    
    // Tear down
    TestFileUtil.deleteDirectory(tempDir);
  }

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    File subDir1 = new File(tempDir+"/subdir1");    
    
    // Test
    final AtomicBoolean eventOccurred = new AtomicBoolean(false);
    
    DefaultRecursiveWatcher watcher = new DefaultRecursiveWatcher(Paths.get(tempDir.getAbsolutePath()), new ArrayList<Path>(), 300, new WatchListener() {
      @Override
      public void watchEventsOccurred() {
        eventOccurred.set(true);
      }      
    });
    
    // Create sub folder BEFORE watcher starts
    subDir1.mkdir();
    
    // Start watcher and wait for watch service to set watch on all folders
    watcher.start();    
    Thread.sleep(100);
    
    // Event 1 
    TestFileUtil.createRandomFileInDirectory(subDir1, 10);
    assertFalse(eventOccurred.get());


    Thread.sleep(350);
    assertTrue(eventOccurred.get());


    // Stop watcher (close watches)
    watcher.stop();
    
    // Tear down
    TestFileUtil.deleteDirectory(tempDir);
  }

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    File subDir1 = new File(tempDir+"/subdir1");    
    
    // Test
    final AtomicBoolean eventOccurred = new AtomicBoolean(false);
    
    DefaultRecursiveWatcher watcher = new DefaultRecursiveWatcher(Paths.get(tempDir.getAbsolutePath()), new ArrayList<Path>(), 300, new WatchListener() {
      @Override
      public void watchEventsOccurred() {
        eventOccurred.set(true);
      }      
    });
    
    // Start watcher and wait for watch service to set watch on all folders
    watcher.start();    
    Thread.sleep(150);
    
    // Create sub folder AFTER watcher starts
    subDir1.mkdir();
    Thread.sleep(370);
    assertTrue(eventOccurred.get());
    
    eventOccurred.set(false);
    
    // Event on NEW subfolder
    TestFileUtil.createRandomFileInDirectory(subDir1, 10);
    assertFalse(eventOccurred.get());


    Thread.sleep(350);
    assertTrue(eventOccurred.get());


    // Stop watcher (close watches)
    watcher.stop();
    
    // Tear down
    TestFileUtil.deleteDirectory(tempDir);
  }

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    File tempDir = TestFileUtil.createTempDirectoryInSystemTemp();    
    
    // Test
    final AtomicBoolean eventOccurred = new AtomicBoolean(false);
    
    DefaultRecursiveWatcher watcher = new DefaultRecursiveWatcher(Paths.get(tempDir.getAbsolutePath()), new ArrayList<Path>(), 300, new WatchListener() {
      @Override
      public void watchEventsOccurred() {
        eventOccurred.set(true);
      }      
    });
    
    // Start watcher and wait for watch service to set watch on all folders
    watcher.start();    
    Thread.sleep(100);


    // Create sub folder hierarchy
    File lastSubFolder = tempDir;
    
    for (int i=0; i<100; i++) {
      lastSubFolder.mkdir();
      lastSubFolder = new File(lastSubFolder+"/"+i);
    }
    
    lastSubFolder.mkdir();
    
    // Wait for settlement
    Thread.sleep(350);
    eventOccurred.set(false);
    
    // Event on DEEPEST new subfolder
    TestFileUtil.createRandomFileInDirectory(lastSubFolder, 10*1024);
    assertFalse(eventOccurred.get());
    
    Thread.sleep(500);
    assertTrue(eventOccurred.get());
    
    // Stop watcher (close watches)
    watcher.stop();
    
    // Tear down  
    TestFileUtil.deleteDirectory(tempDir);
  }

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    // Test
    final AtomicLong watcherEventOccurredTime = new AtomicLong(0L);
    final AtomicInteger watcherEventOccurredCount = new AtomicInteger(0);
    final AtomicLong fileWrittenTime = new AtomicLong(0L);
    
    DefaultRecursiveWatcher watcher = new DefaultRecursiveWatcher(Paths.get(tempDir.getAbsolutePath()), new ArrayList<Path>(), 300, new WatchListener() {
      @Override
      public void watchEventsOccurred() { 
        watcherEventOccurredCount.addAndGet(1);
        watcherEventOccurredTime.set(System.currentTimeMillis());
      }      
    });
    
    // Start watcher 
    watcher.start();    
    Thread.sleep(200); // Wait for watch service to set watch on all folders
    
    File largeFile = new File(tempDir+"/largefile");
        
    TestFileUtil.createRandomFile(largeFile, 50*1024*1024);
    fileWrittenTime.set(System.currentTimeMillis());
    
    // Stop watcher (close watches)
    Thread.sleep(400); // Wait for the watcher to fire an event
    watcher.stop();
    
    // Test
    assertNotSame(0L, watcherEventOccurredTime.get());
    assertEquals(1, watcherEventOccurredCount.get());
    assertNotSame(0L, fileWrittenTime.get());

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    File tempDir = TestFileUtil.createTempDirectoryInSystemTemp();    
    
    // Test
    final AtomicInteger watcherEventOccurredCount = new AtomicInteger(0);
    
    DefaultRecursiveWatcher watcher = new DefaultRecursiveWatcher(Paths.get(tempDir.getAbsolutePath()), new ArrayList<Path>(), 300, new WatchListener() {
      @Override
      public void watchEventsOccurred() { 
        watcherEventOccurredCount.addAndGet(1);
      }      
    });
    
    // Start watcher 
    watcher.start();    
    Thread.sleep(200); // Wait for watch service to set watch on all folders
    
    for (int i=0; i<20; i++) {
      TestFileUtil.createRandomFile(new File(tempDir+"/"+i), 50*1024);
    }        


    // Stop watcher (close watches)
    Thread.sleep(400); // Wait for the watcher to fire an event
    watcher.stop();
    
    // Test
    assertEquals(1, watcherEventOccurredCount.get()); // not 20!
    
    // Tear down

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org.syncany.tests.operations.RecursiveWatcherTest

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