MVC and Code Splitting

[Xybrek]

In my application there are many views and controllers, however not all
are needed at once, mostly the view that is loaded depends on the URL
fragment(s).

In what way or pattern a Controller and View be wrapped in a
GWT.runAsync so that only controllers and views needed are loaded?

I just need to get some ideas on how I will implement this.

In my case, I have a home-grown MVC. My application parse the Url
fragment and then show() the appropriate view. In which the parameter of
the show() function is a key String that will then be used to get the
views that are stored in a HashMap.

Everything, the Controllers, Models and Views are instantiated during
onModuleLoad()

Any ideas?

[Thomas Broyer]

Start by "lazy instantiating" your components, then throwing runAsync in will become much easier.

If you have interfaces, you could try AsyncProxy instead; but if you want lazy-loading, start by architecturing your app around that pattern.

Before:

// in onModuleLoad

map.put("foo", createFoo());

map.put("bar", createBar());

// then retrieving the objects:

return map.get(key);

After:

//when retrieving the objects

Object o = map.get(key);

if (o == null) {

  if ("foo".equals(key)) {

    o = createFoo();

  } else if ("bar".equals(key)) {

    o = createBar();

  }

  map.put(key, o);

}

return o;

Adding runAsync would mean changing the getViewFromToken from synchronous to asynchronous, with a RunAsyncCallback as an additional argument.

[Xybrek]

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That's a nice pattern. I did applied this approach and works. However,
my problem is not solved yet, because the GWT-Recaptcha is still causing
request to a external site even if I have used that approach.

I am yet to understand how to fix this thing.