How classes are interacting with each other?

In the Low-Level Design (LLD) of the vending machine system, classes are used to model numerous software entities and their interactions. Here’s an in depth clarification of the way classes interact with each other:

• User Interface Class:
  • Communicates with the Payment Processing class to initiate and process transactions based totally on user inputs.
  • Sends requests to the Inventory Management class to update product data and availability on the display.
• Payment Processing Class:
  • Communicates with the Coin Mechanism class to validate and process inserted cash.
  • Interfaces with the Bill Acceptor class to authenticate and process paper currency.
  • Connects with the Card Reader class to authorize credit or debit card transactions.
  • Notifies the Inventory Management class when it hits successful transactions and update product quantities.
• Inventory Management Class:
  • Receives updates from the Payment Processing class concerning product sales and restocking activities.
  • Communicates with the Dispensing Logic class to manage product dispensing and stock manage.
• Security Measures Class:
  • Monitors interactions among various class to hit upon any anomalies or unauthorized access.
  • Collaborates with the Communication Protocols class to make sure steady information transmission.
• Communication Protocols Class:
  • Facilitates communication between the User Interface, Payment Processing, and Inventory Management class.
  • Manages serial communication with hardware components together with the Coin Mechanism, Bill Acceptor, and Card Reader.
  • These interactions (actions or exchanges of information) create a connected flow of data and control between different parts or groups.
  • This setup makes the design organized into separate and easy-to-manage sections.

Vending machines have become an essential part of our everyday lives, offering various kinds of products starting from snacks and beverages to personal care items. While their capability can also appear simple from a user perspective, the low-level design of a vending machine includes complex info to ensure clean operation, robustness, and safety. In this article, we will dig into the low-level design of a vending machine.