For the close button, instead of adding a hyperlink from the java code, this time we used JSNI which enables you to integrate JavaScript directly into your application.

We have a class called GenericNotifcation in the package org.remote.dogan.client. When a noticition bar is needed,

public static void showNotification(String message, int seconds)

is called.To hide the bar the following method is called,

public static void hideNotification()

So, to make the JSNI close method call from js, we need to call the hideNotification java method from js.

To do this, we add amethod to register hideNotification method a js method for the handwritten javascript

public static native void exportStaticMethod() /*-{
$wnd.closeNotification =
	@org.remote.dogan.client.GenericNotifcation::hideNotification();
}-*/;

As a second step, we should call the method exportStaticMethod() to actually make the registration of the js method. We do this in showNotification method but for a generic case, onModuleLoad is good candidate.

public static void showNotification(String message, int seconds)

{
GenericNotifcation.exportStaticMethod();
...
}

So as the last step, we add the js call in the html template like the following:
<a title=”close this notification” onclick=’closeNotification()’ />x</a>

For further information, the documentation for GWT JSNI is here.

Memcache provides convenience to store a frequent query in memory, so that you don’t have to make the same execution over and over again. For the iPhone application I build (Fragman), I build a GAE/J backend for managing movie names, IMDB URLs, thumb images, video files, etc. It interacts with the Obj-c code via calls encoded in JSON.

Since the categories are updated so frequently (new trailer, top 250 , soap opera trailers), every time the user starts the application from her iPhone, the corresponding categories Id(key) lists are  created which includes all the aspects mentioned above,

what I see, after people start to use the application that, most of the time, the application got stuck with the time constraint of GAE and this causes inconvenience, so I decided to hold the category lists’s JSON in memory. Following is the code ,

this is the servlet for creating the JSON which is called after say upcoming movie list is changed. This servlet updates the memcached list

        List keyList = new ArrayList();
	static Cache cache;
	static
	{
		try
		{
			CacheFactory cacheFactory =

CacheManager.getInstance().getCacheFactory();
			cache = cacheFactory.createCache(

Collections.emptyMap());
		}
		catch (CacheException e)
		{
			// ...
		}
		//.....
                public void doGet(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException

	        {
                       //................
                       if(cache.containsKey(mode))
		       {
			     cache.remove(mode);
		       }
		       cache.put(mode, keyList);
	        }

                //........

          }

And this is the servlet that fetch the Fragman beans from the datastore with the given keys (key list is got from the memecached list)

          keyList = (List)cache.get(mode);

By doing this, I reduce the time that the servlet that creates the JSON takes.