Proxy Design pattern - Real Time Example [ATM]

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Proxy Design Pattern Explained: ATM System Real-World Example

Grasping abstract design patterns becomes significantly simpler when applying them to familiar, everyday scenarios. In this guide, we break down the Proxy Design Pattern through the real-world example of an Automated Teller Machine (ATM) System.

The ATM as a Proxy to Bank Operations

When you withdraw cash or check your account balance at an ATM, you are not directly walking into the bank's core vault or directly modifying the central database ledger. Instead, the ATM machine operates as a physical and logical Proxy:

• Client (Bank Customer): Initiates operations such as checking balances, transferring funds, or requesting cash withdrawals.
• Proxy (ATM Terminal): Verifies your PIN, validates available funds, enforces daily withdrawal limits, and securely forwards approved requests to the bank server.
• Real Subject (Central Bank Server / Core Account): Maintains your actual financial records and performs the final balance deductions or updates.

Why Use the Proxy Pattern Here?

1. Security & Protection: Restricts direct access to core banking servers, safeguarding critical account data behind PIN authorization and card validation.
2. Remote Communication: Bridges the physical distance between widely distributed branch ATMs and central data processing centers.
3. Resource Management: Prevents overload by handling local screen validations and caching basic session states before dispatching remote network calls.

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Click here to watch in Youtube : https://www.youtube.com/watch?v=Z8hsZAIksdY

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Proxy Design pattern - Real Time Example [ATM]

Proxy Design pattern - Real Time Example [ATM]

See also:

Proxy Design Pattern - Introduction

Proxy Design pattern - Real Time Example [Proxy Server]

Proxy Design pattern - Class Diagram

Proxy Design pattern - Sequence Diagram

Proxy Design pattern - Implementation [Protection Proxy]

Proxy Design pattern - Implementation [Remote Proxy]

Proxy Design pattern - Implementation[Virtual Proxy]

Proxy Design Pattern - Key Points

All Design Patterns Links