Avoid detecting incomplete files when watching a directory for changes in java

Question

I am watching a directory for incoming files (using FileAlterationObserver from apache commons).

class Example implements FileAlterationListener {
    public         


        

Answer 1

If you use FileAlterationListener and add a FileAlterationListenerAdaptor you can implement the methods you need and monitor the files with a FileAlterationMonitor ...

public static void main( String[] args ) throws Exception {

    FileAlterationObserver fao = new FileAlterationObserver( dir );
    final long interval = 500;
    FileAlterationMonitor monitor = new FileAlterationMonitor( interval );
    FileAlterationListener listener = new FileAlterationListenerAdaptor() {

        @Override
        public void onFileCreate( File file ) {
            try {
                System.out.println( "File created: " + file.getCanonicalPath() );
            } catch( IOException e ) {
                e.printStackTrace( System.err );
            }
        }

        @Override
        public void onFileDelete( File file ) {
            try {
                System.out.println( "File removed: " + file.getCanonicalPath() );
            } catch( IOException e ) {
                e.printStackTrace( System.err );
            }
        }

        @Override
        public void onFileChange( File file ) {
            try {
                System.out.println( file.getName() + " changed: ");
            } catch( Exception e ) {
                e.printStackTrace();
            } 
        }
    };
    // Add listeners...
    fao.addListener( listener );
    monitor.addObserver( fao );
    monitor.start();
}