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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To try and figure out a solution, I posted the following on Twitter: He also pointed me to his tdd-gwt-gae project which shows many techniques for unit testing with jMock and integration testing with GWTTestCase. Introduction to the MVP pattern: In the case of our example application, this optimization has less impact than it would in a more complex app where Contact objects have substantially more fields.

We will keep things simple for our Yutorial Application, and will have three views:. We need a mechanism to change views in our thtorial. The sample project, referenced throughout this tutorial, can be found at Tutorial-Contacts.

java – Any tutorials on the official GWT MVP framework? – Stack Overflow

Less code equals less testing which means less time that it takes to actually run your tests. The reason being is that the app is really only concerned when some state has changed contact values changed, contact deleted, etc…which is the case after the RPC has returned.

These are the UI components that display model data and send user commands back to the presenter component. It uses the controller to switch from a view to another and to respond to events such as changing context, posting a form.

GWT MVP Development with Activities and Places

View transition is directly tied to the history management and is discussed in greater length below. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. What is their use then?


Each of our views will be ttorial upon a tuorial interface that we will call View. The views in our Contacts application are: The beauty of using setData is that changes to the model can be made without updating the view code.

By removing intelligence or business logic from the view, we reduce risk associated with not testing the view. 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 tutotial of a list. You can click on one of the photos, and a larger version is shown on its own, and here you can edit the title through an editable label where the new title is saved back to the server, if requested.

In the non UIBinder project, the same logic is there, but it is implemented by manually creating the title object and then adding a ValueChangeEvent handler to it.

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. For our sample we have the following Presenters: A representation of a contact within the contact list.

It also has the code to handle changes in the UI that the view has sent back. All of our views will be implemented as three separate items: Join the DZone community and get the full member experience.

Take for example the ContactsView:.

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

Also, watch this presentation by Ray Ryan. By convention, we tend to put all the binding code in a bind method, if we are not using UIBinder. That looks a bit convoluted in regards to the model. At its core, MVP is a design pattern that breaks your app up into the components listed in table 1, the right-hand column of which explains how this is done for PhotoApp. Microservices for Java Developers: Our application has three views, so you can find the three interfaces in the source code, for example in the com.


The launching of the browser coupled with the actual execution of the test case is why these tests typically take longer than standard JRE tests. The first two chapter examples are the same, except they differ in how views are implemented. PhotoDetailsView – displays the photo together with title and other data and allows the user to change some of those details.

The last solution seems like best one, but I’m also curious to know what others are doing. However, you will see that we specifically make the presenter register itself in the view, and that the view notifies the presenter by calling appropriate registered presenter methods when events are raised.

In a similar way to views, we provide a generic presenter interface, a specific one, and an implementation for each presenter.

Sign up or log in Sign up using Google. Houses all of the data objects that are presented and acted upon within your UI.

This means I can’t fully test the flow of a presenter if event firing happens in a callback. If you can manage to decouple app logic from widget-based code, your unit tests will be much more efficient.