Pharo Bookstore Management System

A desktop application developed in Pharo. This project serves as a comprehensive example of object-oriented design, role-based access control, and data serialization in a Pharo environment.

Screencast.From.2026-02-24.22-57-01.mp4

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Key Functionalities

Authentication and Authorization

The system features a dual-access login gateway. Depending on the credentials entered, the application dynamically modifies the interface to grant appropriate permissions:

• Administrator Access: Enables full inventory control, including book creation, removal, and bulk stock adjustment.
• Guest Access: Provides a simplified customer interface focused on browsing and purchasing.

Inventory Management

The administrator dashboard allows for real-time manipulation of the bookstore catalog. Features include:

• Input validation for book titles, authors, and pricing.
• Dynamic stock adjustments via interactive dialogs to add or remove specific quantities of books.
• Protection logic to prevent negative stock values.

Shopping Cart and Checkout Flow

The customer interface utilizes a split-pane layout for a modern user experience:

• Live Inventory View: Browse available books and their current stock levels.
• Active Cart: A secondary table that tracks selected items, quantities, and individual subtotals.
• Automated Accounting: Real-time calculation of the total order value.
• Transaction Validation: A checkout process that verifies stock availability before finalizing the purchase and updating the database.

Data Persistence

To ensure data is not lost between sessions, the application implements a persistence layer using STON (Smalltalk Object Notation). The system automatically handles:

• State restoration upon application startup.
• Incremental saves to a local file whenever the inventory state is modified or a transaction is completed.

Technical Specifications

• Development Environment: Pharo 13
• User Interface: Spec2 Framework
• Data Format: STON (Local File System)
• Architecture: Model-Presenter Pattern
• Clean Code: Heavy use of Smalltalk idioms, including cascaded messages and collection block closures.

Installation and Usage

1. Import the package into your Pharo image using the Iceberg tool.

2. Open a Playground and execute the following:

    BSLoginPresenter new open.

3. Default Credentials:

   • Administrator: admin / admin123
   • Guest: guest / guest123