Dispatcher View Design Pattern – Core J2EE Patterns

Dispatcher view features a dispatcher component, which states the description of the combination of the View helper and the front controller. The dispatcher view pattern and the service to worker component portrays a similar structure. But the two of these patterns divides the tasks and requests among the components differently. The controller and the dispatcher generally cater a limited number of responsibilities when the Service to worker pattern is compared.

This is due to the basicity of the upfront processing and view management logic. Moreover, if the centralized control is not catered as necessary, of the underlying resources, then, the dispatcher might be needed to be moved into a view and the controller is removed. The dispatcher view pattern, along with service to worker pattern caters their own names in order to promote the effective communication to the developers, as they represent a common combination of the other patterns. The dispatcher view pattern recommends delaying the time of view processing with the content retrieval. In view management, the dispatcher generally tends to play a limited role according to the dispatch view pattern.

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Structure of a Dispatch View

The structure of the dispatch view pattern is such that it has several components. Each plays a certain role and caters specific responsibilities. There is a controller, dispatcher, view, helper, value bean and business service. The controller is generally, the contact point for handling a certain request. It is responsible for managing, authenticating and authorizing and delegating to do view management to the dispatcher. A dispatcher manages view and navigates. It is also responsible for managing the choice for the next view to the present. A view is responsible for representing and displaying information to the client. A helper helps the view or controller to complete its processing. The client is looking forward to accessing a particular service, which fulfills the business service role.

Let’s see the following Class diagram that illustrates the Dispatch View Design Pattern.