Designing a UML Class Diagram to facilitate password verification

My task is to design a UML Class Diagram for the following scenario: A user is required to input a 9-digit password. The system then checks this password against a database to verify its correctness. If the password matches, the system displays a message saying "Correct". Otherwise, an "Error" message is shown. After 5 consecutive incorrect attempts by the user, the system stops displaying messages.

As per my analysis, I have identified 4 classes involved in this problem - User, System, Database, and Counter.

  ┌─────────────────────────┬
  │  User                   │
  ├─────────────────────────┬
  │- pass: int              |
  ├─────────────────────────┼
  |+ EnterPass()            | 
  ├─────────────────────────┼
          | *
          |
          |
          |
          |
          |
  ┌─────────────────────────┬
  │  System                 │
  ├─────────────────────────┬
  │                         |
  ├─────────────────────────┼
  |+ CheckPass()            |
  |+ ShowSuccess()          | 
  |+ ShowError()            |
  |+ ShowNothing()          |
  |+ ChangeCategory()       |
  ├─────────────────────────┼
          | 1
          |
          |
          |
          |
          | 1
  ┌─────────────────────────┬
  │  Database               │
  ├─────────────────────────┬
  │- CorrectPass: int       |
  ├─────────────────────────┼
  |+ ValidatePass(): bool   |
  |+ Increment1()           | 
  ├─────────────────────────┼
          | 1
          |
          |
          |
          |
          | 1
  ┌─────────────────────────┬
  │  Counter                │
  ├─────────────────────────┬
  │- CounterState: int      |
  ├─────────────────────────┼
  |+ increment()            |
  |+ GetState(): int        | 
  ├─────────────────────────┼

I would appreciate some feedback on whether this UML diagram accurately represents the scenario. Should there be any specific connection between the Counter and System classes? Are there any additional elements that I should consider including?

javascriptjavaclassumlclass-diagram

Answer №1

It is important to avoid getting bogged down in overly detailed modeling, as it can lead to a stagnant and unproductive model. Focusing on users and functionality is more crucial in OOP, similar to how building a house requires attention to the overall structure rather than each individual brick.

An effective approach would be to concentrate on modeling the problem domain rather than diving too deep into insignificant details.

Consider mapping out the system architecture instead, highlighting key components, roles, and relationships within the system. This shift towards architectural modeling may enhance the understanding of your System and Database.

While your UML model might be technically correct, its practical usefulness may be limited.

Furthermore, encountering one-to-one multiplicity often serves as a warning sign that warrants closer examination.

Answer №2

The design of this system could be improved. Instead of having Database and Counter as classes, consider restructuring them. Database can be renamed to User, representing the users allowed in the system with properties like name, encrypted password, last login, etc. Counter can be integrated as a private attribute within Authentication, simplifying the structure.

Rather than using System for password checks, create a separate class called Authentication. The System can then encompass multiple other classes alongside Authentication, streamlining the organization of code. As for implementation details regarding persistence, that can be addressed in a later design phase when making these classes persistent through a persistence interface.

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