Designing and Programming CICS Applications

Chapter 10. Designing the Presentation Logic

In this chapter:

• Understanding What the Presentation Logic Component Needs to Do

• Interface Design Principles

• Incorporating CICS Design Guidelines

• Designing the Functions

In the KanDoIT company, the accounts department has decided that it is very happy with its existing 3270-based applications. So here we describe the background to a 3270 user interface and the design principles behind writing the presentation logic.

This chapter describes the design of the presentation logic of the Accounts system. There are two key stages that you need to consider in your design. They are:

• Designing the user interface, including checks for valid data, and the ability for the users to correct their input. There are two sections describing what the presentation logic has to do and another describing the ways to incorporate the CICS design guidelines.

• Sending and receiving the information to your appropriate business logic component. This describes how information is sent from the screen to the business logic and also how the data is returned to the screen.

Understanding What the Presentation Logic Component Needs to Do

The basic design behind each of the frontends that we describe in this book is:

• To create a clear, easy-to-use screen so that the users can enter their data quickly and easily.

• To transfer data to the business logic.

• To receive information from the business logic to display on the screen.

The plan to achieve that for this component is to:

• Display a customer ...