README.md

Proxy Pattern

What is the Proxy Pattern?

The Proxy Pattern is a structural design pattern that lets you provide a substitute or placeholder for another object. A proxy controls access to the original object, allowing you to perform something either before or after the request gets through to the original object.

Implementation in This Project

This example demonstrates the Proxy pattern by using a ProxyImage to control access to a RealImage:

• Image: Subject interface.
• RealImage: Real subject that loads and displays images.
• ProxyImage: Proxy that controls access to the real image.

Class Diagram

flowchart TD
    A["App.java"] --> B["ProxyImage"]
    B --> C["Image (interface)"]
    B --> D["RealImage"]
    D --> C

Loading

Example Usage

Image image = new ProxyImage("test_10mb.jpg");

// Image will be loaded from disk
image.display();
System.out.println("");

// Image will not be loaded from disk
image.display();

When to Use

• When you want to control access to an object.
• When you want to add a wrapper and delegation to protect the real component from undue complexity.