Software architecture patterns

Factory

Defines an interface for creating objects but lets subclasses alter the type of created objects.

Abstract Factory

Provides an interface for creating families of related objects without specifying their concrete classes.

Builder

Constructs a complex object step by step, often used when objects need many optional parameters or different configurations.

Prototype

Creates new objects by copying an existing object, used for cloning and when object creation is expensive.

Singleton

Ensures a class has only one instance and provides a global access point to it.

Such class doesn't have a public constructor but a pulic static getter returned the instance of this class.

Adapter

Converts an interface of a class into another interface that clients expect, allowing incompatible interfaces to work together.

Bridge

Separates an abstraction from its implementation, so the two can vary independently.

Composite (Tree)

Treats individual objects and compositions of objects uniformly, often used to represent hierarchies (e.g., a file system).

Decorator (Wrapper)

Adds new behavior to objects dynamically without altering their structure, useful for adding features at runtime.

Facade

Provides a simplified interface to a complex subsystem, used to reduce dependency and simplify interactions.

Flyweight (Cache)

Reduces memory usage by sharing common parts of objects, especially useful in systems with large numbers of similar objects.

Proxy

Provides a placeholder for another object to control access, manage permissions, or optimize performance.

With an Adapter, you access an existing object through a different interface.
With an Proxy, the interface remains unchanged.
With Decorator, you access an object through an extended interface.