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Simple Factory Pattern Overview The Simple Factory Pattern decouples the client code from the object instantaition logic by centralizing creation inside a dedicated factory. The client requests objects from the factory instead of instantiating them directly, which improves maintainability and extensibility. A key limitation is that adding or mo ...

Aircraft Control System Scenario Consider an aircraft control system involving airplanes, control towers, and ground services. class Airplane { private ControlTower tower; private GroundService service; public Airplane(ControlTower t, GroundService g) { this.tower = t; this.service = g; } public void reques ...

In large-scale web applications, caching is a fundamental technique alongside asynchronous and parallel processnig. For externally exposed APIs, implementing caching is crucial to prevent repeated database queries that can lead to server instability. Below is a generic cache manager interface that defines the core operations for a caching syste ...

Composite Pattern Overview The Composite Pattern, also known as the Part-Whole pattern, is a structural design pattern that allows treating individual objects and compositions of objects uniformly. It achieves this by defining a common interface for both leaf nodes (individual objects) and composite nodes (containers that hold other objects), e ...

Instantiating classes directly via constructors often couples client code tightly with concrete implementation details. This friction becomes pronounced when objects require multi-step configuration, validation, or conditional setup based on runtime parameters. Instead of scattering initialization logic across multiple consumer classes, central ...

The Decorator pattern enables the dynamic addition of behaviors to an individual object without altering its underlying structure or inheritance hierarchy. It provides a flexible alternative to subclassing by wrapping objects with decorator classes that perform additional tasks before or after delegating to the wrapped component. Architectural ...

The Singleton pattern ensures that a class has only one instance in memory and provides a global access point to retrieve that instance. Note: When creating a Console App project in Visual Studio, choose the correct template (e.g., "Console App (.NET Framework)" instead of ".NET Core") to avoid unexpected encoding issues. T ...

Pattern OverviewThe Chain of Responsibility (CoR) pattern is a behavioral design pattern that promotes loose coupling between a sender and a receiver. It accomplishes this by allowing a request to traverse a chain of potential handler objects. Each object in the chain is given an opportunity to process the request, either handling it completely ...

This article discusses the implementation of a unified verification code sending system that handles multiple business scenarios through a comon interface. Core Implementation The system processes verification code requests through a cenrtalized service that delegates to specific handler implemantations based on business type codes. import org. ...

The proxy pattern is a foundational concept for understanding the underlying mechanics of Spring AOP. It allows you to control access to an object by providing a surrogate or placeholder. Static Proxy In a static proxy implementation, the proxy class is created manually or by specific tools before compilation. Core Components: Subject Interfac ...