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Architecting your Google Web Toolkit GWT apps with Model View Presenter ( MVP) At its core, MVP is a design pattern that breaks your app up into the. Main Components of GWT MVP. Framework. • Model. – Responsible for holding raw data. – No business logic allowed (just like any model really). • Example. Modular design for large-scale apps, similar to the widely-accepted MVC approach in “normal” Web applications.

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A light version of the Contact that contains only the unique identifier and display name.

Care to explain downwote? For example, if we have changed to the situation in figure 2, then the onValueChange method determines that the value detail means it needs to call the doPhotoDetailsDisplay method. Far too many times when building GWT-based apps, we find ourselves slinging code wherever necessary to make the app work, and sometimes more importantly look good.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. A presenter contains all of the logic for our Contacts application, including history managementview transition and data sync via RPCs back to the server. At the heart of this pattern is the separation of functionality into components that logically make sense, but in the case of GWT there is a clear focus on making the view as simple as possible in order to minimize our reliance on GWTTestCase and reduce the overall time spent running tests.


The actual actions do not change.

MVP Architecture for GWT Application

It may not be easy to tutorrial from a programmatical point view at the begining, but the theory is pretty clear. Click here to view the complete list of archived articles. There are two key things to note about this interface. Remember, test driven development is your friend. Figure 1 The three views shown by the photo application.

Presenters are where all the application logic sits mfp will have no UI components. Instead at least in our example appwe pass around events such as a contact being updated, the user switching to the edit view, or an RPC that deleted a user has successfully returned from the server.

GWT MVP Development with Activities and Places

Completely inverse to that, your views should contain tutotial more than widgets, and should avoid any application logic wherever possible. Over a million developers have joined DZone. Within the constructor, we also call the bind method from the Presenter interface.

Finally, we need to implement the AppController, which is the application supervisor. More specifically, we have to make sure our presenters are solely relying on plain old Java code.

Introduction to the MVP pattern: a GWT example | G-Widgets

Opinions expressed by DZone contributors are their own. We implement that as a very simple mock-up component that reads data from a file and. Download the get instantly from manning. To be transparent, with methods such as getClickedRow and getSelectedRows the presenter is making the assumption that a view is going to display the data in the form of a list.


Microservices for Java Developers: The view is completely passive and every interaction of the view with the model is done through the Presenter. The views in our Contacts application are: In our PhotoApp, we will have one very simple model:. Presenter The presenter will hold the complex application and business logic used to drive UIs and changes to the model.

PhotoListPresenter – drives the thumbnail view. However, The view can directly invoke functionalities from the model such as checking a value from the database or making a calculation. Usually for each view, there will be an associated presenter. In our PhotoApp, we will have one very simple model: The other gw that all our views will extends the IsWidget interface.

Technically there is no reason tutorila to make the presenter listen for events from the view widgets.

What is their use then? Instead of “Presenter”, they are called “Activities. But allowing the view to call back into the presenter makes using the UIBinder approach easy, as you can see in figure 2. Usually, unit tests are only applied to business logic and the model. It turns out that our implementation of the PhotoDetailsView interface is pretty simple. Sign up or log in Sign up using Google.

Migrating to Microservice Databases. To help explain these concepts we will use a simple Contacts application as an example.