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User Guide
The information contained in this section applies to IBM WebSphere Commerce Version 7.0.0.9 and Feautre Pack 8. The documentation also applies to all subsequent releases and modifications until otherwise indicated in new editions.
Developing
The topics in the Developing section describe tasks performed by an application developer.
Presentation layer
WebSphere Commerce uses Java Server Pages (JSP) to implement the view layer of the Model-View-Controller (MVC) design pattern. The view layer is in charge of retrieving data from the database through the use of data beans and formatting it to meet the display requirements. The view layers determines whether the request is sent to a browser or streamed out as XML. JSP files present a clean separation between data content and presentation.
Customizing IBM Sales Center
In the IBM Sales Center for WebSphere Commerce there is a set of user interface panels, views and dialogs that contain the most commonly used features. You can add to or configure the user interface to suit your needs, as well as changing the content and format of the data that is passed between the client and the server.
Data model
The data model is used to cache business objects on the client. The TelesalesModelManager class provides access to the model and contains convenience methods for accessing and updating child objects. The default IBM Sales Center data model contains model objects that represent the operator, customers, orders, products and other commonly used objects. All of the objects found in the client cache are instances of ModelObject. You can store additional properties in a model object using the setData and getData methods. You can also add listeners to model objects that will be notified of any change to the model object. If a property is a list of model objects, use the ModelObjectList instead of a generic container object to ensure that property notification is handled properly. Listeners will be notified if any changes to model objects that are properties of the model object that you are listening to. If you define a listener to the root model object, your listener will be notified of all changes to the model.
Adding a model object
The data model is used to cache business objects on the client.

Adding a model object

The data model is used to cache business objects on the client.

About this task

To add a model object to the model:

Procedure

Create a new class which should extend ModelObject class defined in com.ibm.commerce.telesales.core plug-in.
Register the newly created model object using the model object extension point.
Use the TelesalesModelObjectFactory.createModelObject method to construct new instances of this model class wherever required. For example: CustomModelObject modelObject = (CustomModelObject) TelesalesModelObjectFactory.createModelObject( "ID_OF_CustomModelObject" ); Note: The ID of CustomModelObject used above is defined while registering this class in the extension point.
```
<extension
point="com.ibm.commerce.telesales.core.modelObjects">
  <modelObject id="ID_Of_CustomModelObject"
class="package.CustomModelObject"/>
</extension>
```
Add instances of your new class to the model as properties of other model objects. If your model object will be at the root level, then add it as a property of ModelRoot. If your model objects are actually a list of model objects, then you can use the ModelObjectList to group your model objects into a list. Add ModelObjectList as a property of the parent object ModelObject.