String code =   "window.setInterval( function() {\n"
                + "  org.eclipse.swt.Request.getInstance().send();\n"
                + "}, 10000 );"; // polling interval in ms
  JSExecutor.executeJS( code );

public class ClientPolling {
	
	public ClientPolling(Display display, int mSeconds) {
		if ( mSeconds > 0){
			this.mSeconds = mSeconds;
		} else  {
			this.mSeconds = 100;
		}
		this.display = display;
	}

	final private Display display;
	final private int mSeconds;
	private boolean polling = false;
	final static Logger log = LoggerFactory.getLogger(ClientPolling.class);

	synchronized void stopPolling(){
		if ( !polling ) return;
		polling = false;

		Job job = new Job( "Stop Polling" ) {
			protected IStatus run( IProgressMonitor monitor ) {
				display.asyncExec(new Runnable() {
					@Override
					public void run() {
						JavaScriptExecutor executor = RWT.getClient().getService( JavaScriptExecutor.class );
						if( executor != null ) {
							executor.execute("window.clearInterval(aktiv);");
						}else{
							log.error("Could not run stop polling script on client.");
						}
					}
				});
				return Status.OK_STATUS;
			}
		};
		job.schedule();
	}

	synchronized void startPolling(){
		if ( polling ) return;
		polling = true;
		
		
		Job job = new Job( "Start Polling" ) {
			protected IStatus run( IProgressMonitor monitor ) {
				display.asyncExec(new Runnable() {
					@Override
					public void run() {
						JavaScriptExecutor executor = RWT.getClient().getService( JavaScriptExecutor.class );
						if( executor != null ) {
							executor.execute("var aktiv = window.setInterval( function() {\n"
									+ "  org.eclipse.swt.Request.getInstance().send();\n"
									+ "}, " + mSeconds + " );");
							log.info("started polling script on client.");
						}else{
							log.error("Could not run start polling script on client.");
						}
					}
				});
				return Status.OK_STATUS;
			}
		};
		job.schedule();
	}	

}