Blackberry 7130E - VERSION 4.1 Manuel d'utilisateur télécharger pdf (Page 17)

Use Case: MaintainDatabase

This use case consists of the ProjectDB.java class which provides the functions for the

BlackBerry’s persistent data storage via the RecordStore class. This class also provides

the functions for opening, closing, adding, updating and retrieving record stores.

Dependencies: none

Actors: BlackBerry user

Preconditions: The system is running.

Flow:

Basic Flow

Step

Initiator

System

This user case begins when the

actor has accessed the Goal,

Weigh-in or Progress screens.

The following record store tasks are

completed:

Goal Use Case

 Opens Goal Record Store

 Retrieves Current Goal

 Updates Goal

Weigh-in Use Case

 Opens Weigh-in Record Store

 Adds weigh-in record

Progress Use Case

 Opens Goal and Weigh-in Record

Stores

 Retrieves Goal

 Retrieves Weigh-ins

and the use case ends.

Postconditions: The actor was able to perform record store tasks.

Decisions and Trade-offs

The following are some decisions and trade-offs that I made during my project:

 Non-Corporate platform – the BlackBerry is most widely used in the corporate

environment, but this application was not connected to a corporate server.

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Blackberry 7130E - VERSION 4.1 Manuel d'utilisateur Page 17