file change notification

Hi,

I'm trying to implement a file change notification. I mean i want to be notifyed when some changes occured in a directory.
I can't use java 7 ...

I want to use DefaultFileMonitor from Apache common.

Here is a sample code which is working :

import org.apache.commons.io.FileUtils;
import org.apache.commons.vfs.FileChangeEvent;
import org.apache.commons.vfs.FileListener;
import org.apache.commons.vfs.FileObject;
import org.apache.commons.vfs.FileSystemManager;
import org.apache.commons.vfs.VFS;
import org.apache.commons.vfs.impl.DefaultFileMonitor;

import java.io.File;
import java.io.IOException;

public class MinimalFileMonitorBug {
    private static final String path = "dummy.txt";

public static void main(String[] args) throws IOException,
            InterruptedException {
        FileSystemManager fsManager = VFS.getManager();
        FileObject listendir = fsManager.resolveFile("C:/naruto");

MyFileListener listener1 = new MyFileListener();

DefaultFileMonitor fm = new DefaultFileMonitor(listener1);
        fm.setRecursive(true);
        fm.addFile(listendir);
        fm.start();
        Thread.sleep(20000);
    }

static class MyFileListener implements FileListener {
        public void fileCreated(FileChangeEvent fileChangeEvent)
                throws Exception {
            System.out.println("file created : "
                    + fileChangeEvent.getFile().getName());
        }

public void fileDeleted(FileChangeEvent fileChangeEvent)
                throws Exception {
            System.out.println("file deleted : "
                    + fileChangeEvent.getFile().getName());
        }

public void fileChanged(FileChangeEvent fileChangeEvent)
                throws Exception {
            System.out.println(String.format(
                    "File [%s] changed event from [%s]", fileChangeEvent
                            .getFile().getName(), this));
        }
    }
}

My problem comes from the Thread.sleep (20000), I would the program to run until explicitely called.

Any help would be appreciated.

Christohpe

I would the program to run until explicitely called.

For example, how do you intend to stop it ?

fm.stop()

I mean the main program, when and how do you want to stop it ? You are watching a directory for changed, aren't you ? This is supposed to run until when ?

I will run this in a struts web application with start and stop button.
Thanks

or I will start it in a filter and stop it in the destroy method of the servlet

In a web application, this will be fine, as you can leave the file monitor running until the web application is shutdown, or until you explicitly call the stop() method. But in your example, which is not a web application, you need some sort of information to make it stop. For example, you could loop for ever and wait until you press a certain key.

thanks you