FileWatcherHandler

This project allows watching files for different file events like create,modify & delete and then act on these events in generic way.

How to Use?

1. Create a Path object representing the directory to monitor for file events.

Path path = Paths.get("/home/omkar/test");

2. Implement the FileHandler interface to perform an action detected by file event registered.

public class FileHandlerTest implements FileHandler {

	private static final Logger LOGGER = Logger.getLogger(FileHandlerTest.class.getName());
	
	/*
	 * This implemented method will delete the file
	 * 
	 * @see com.io.util.FileHandler#handle(java.io.File,
	 * java.nio.file.WatchEvent.Kind)
	 */
	public void handle(File file, Kind<?> fileEvent) {
		LOGGER.log(Level.INFO,"Handler is triggered for file {0}",file.getPath());
		if(fileEvent == StandardWatchEventKinds.ENTRY_CREATE) {
			try {
				boolean deleted = Files.deleteIfExists(Paths.get(file.getPath()));
				assertTrue(deleted);
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

}

3. Create an instance of an Implemented FileHandler

FileHandlerTest fileHandlerTest = new FileHandlerTest();

4. Create an instance of a FileWatcher by passing path,an instance of an Implemented FileHandler and types of file events that you want to monitor separated by commas.

FileWatcher fileWatcher = new FileWatcher(path, fileHandlerTest,false, StandardWatchEventKinds.ENTRY_CREATE); 
//For non-recursive polling

OR

FileWatcher fileWatcher = new FileWatcher(path, fileHandlerTest,true, StandardWatchEventKinds.ENTRY_CREATE); 
//For recursive polling

5. Now Create and start a new Thread.It is recommended to use ExecutorService.

Thread watcherThread = new Thread(fileWatcher);
watcherThread.start();

This thread will start polling for your registered file events and will invoke your custom handle method once any of the registered events are detected.

Authors

• Omkar Marathe - Initial work - Omkar

Support/Contributing

If you've found an error in this sample, please file an issue here

Patches are encouraged, and may be submitted by forking this project and submitting a pull request through GitHub.

License

This project is licensed under the Apache License - see the LICENSE file for details