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The client tier serves as an interface with any number of other systems. A transaction enters the workflow, for example, as an HTML request from a standard web browser or as an XML-formatted electronic message from another system. You should decouple the client type from the enterprise application by using an HTML browser, an applet, a Java application, and, last and but certainly not least, a non-Java application.
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A common method for designing applications is to organize them around an eventdriven user interface. In this design pattern, the developer creates the interface and subsequently writes code that will execute the desired application actions in response to user gestures. This structure can be successful for small, single-user systems that will require little alteration to the functionality over time. However, it is not suitable for larger, distributed projects for the following reasons:
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n More sophisticated applications may require data to be viewed and
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manipulated in several different ways. When business logic is implemented in the display code, display inconsistencies can result because the logic can be copied and modified in one object and not another. In addition, any change to the data display requires updates in several places.
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n When data manipulation logic, format and display code, and user event
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n User interfaces cannot be reused if the application logic has been combined
with the code for an existing interface.
n Added functionality may require several changes to existent code, which may
be difficult to locate.
n Business logic code may access a vendor-specific product (a database, for
example), thus making the application much less portable.
n Changes to a single piece of code may have far-reaching side effects. n Development cannot occur on a modular basis, as everything is dependent
on everything else. This problem is amplified on large-scale development projects because it is difficult for a large team of developers to split tasks.
n Code is less reusable, because components are dependent on one another;
therefore, they are less usable in other contexts. To overcome these shortcomings, utilizing the MVC design pattern best practice results in a separation of the application data from the ways that the data can be accessed or viewed as well as from the mapping between system events (such as user interface events) and application behaviors.
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Best Practice: MVC Pattern
The MVC pattern consists of three component types:
n Model n View
Represents the application data along with methods that operate on that data. Displays that data to the user. Translates user actions such as mouse movement and keyboard input and dispatches operations on the Model.
n Controller
As a result, the Model will update the View to reflect changes to the data. Figure 4-11 illustrates the functions of each of these component types as well as the relationships among them. When this best practice is used properly, the Model should have no involvement in translating the format of input data. This translation should be performed by the Controller. In addition, the Model should not carry any responsibility for determining how the results should be displayed. Table 4-7 displays the participants and collaborations involved with the three components. The MVC model should be used as follows:
n For distributed applications n For larger applications n For applications with a long lifetime n Where interface and back-end portability are important
FIGURE 4-11
Relationships among components
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TABLE 4-7
Component
Model
Participants
Extrapolates the business logic of the application Maintains the application state Provides access to functions of the application Manages persistence Extracts data for the View component Informs interested parties of changes to data Extrapolates data presentation Responds to users with data Maintains consistency with Model data Extrapolates user interaction/ application semantic map Transforms user actions into application actions Determines the appropriate data display based on user input and context
Collaborations
Informs the View when it makes changes to the application data Can be queried by the View Gives the Controller access to application functionality
MVC Participants and Collaborations
View
Provides Model data for the user Refreshes display when informed of data changes by the Model Transfers user input to the Controller Transforms user inputs and dispatches class logic or application actions on the Model Selects the View to present based on user input and Model action outcomes
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