Vaadin ThreadLocal

I use the Vaadin Thread Local pattern in my Vaadin applications as a means to move the Application object around the various components and to implement a authentication process.

The structure of an application which uses this pattern is as follows:

public class VaadinApplication extends Application implements HttpServletRequestListener {

    private static ThreadLocal<VaadinApplication> instance = new ThreadLocal<VaadinApplication>()

public VaadinApplication() {

instance.set(this);

}

@Override

public void onRequestStart(HttpServletRequest request, HttpServletResponse response) {

instance.set(this);

}

@Override

public void onRequestEnd(HttpServletRequest request, HttpServletResponse response) {

instance.remove();

}

public static VaadinApplication getInstance() {

return instance.get();

} }