The Adapter Pattern is a structural design pattern that allows objects with incompatible interfaces to collaborate. While the classic pattern typically involves class adapters, object adapters, or interface adapters, this article explores a more generalized approach: a central adapter that manages a...
Signature Algorithm Abstraction When integrating with external systems, API requests typically require authentication through AK/SK credentials with corresponding signature verification. A well-designed signature interface allows flexible support for multiple algorithms: package com.integration.gate...
To generate and store image thumbnails, the system must support multiple input sources—such as local files or remote URLs—and various output destinations, including local sttorage, MinIO, Alibaba Cloud OSS, or Qiniu Cloud. Given that both input and output strategies may evolve independently, a flexi...
Flyweight Pattern The Flyweight pattern is a structural design pattern that aims to minimize memory usage by sharing as much data as possible with similar objects. It's particularly useful when you need to create a large number of similar objects, as it reduces the number of objects created and thus...
The Singleton design pattern is a creational pattern that ensures a class has only one instance and provides a global point of access to it. This pattern is particularly useful when exactly one object is needed to coordinate actions across the system, such as managing a single configuration, a loggi...
The Prototype pattern enables object creation by copying an existing instance—called a prototype—rather than instantiating classes directly. This approach is especially useful when object initialization is costly or when many similar objects are needed with minor variations. A basic implementation i...
The Decorator pattern enables adding new responsibilities to an object dynamically without altering its structure. It creates a chain of decorators, each wrapping the previous object, forming a linked structure similar to a linked list. This approach maintains references to original functionality wh...
The Singleton pattern belongs to the category of creational design patterns. It restricts the instantiation of a class to a single object and provides a global point of access to that instance. This approach is particularly useful when exactly one object is needed to coordinate actions across a sys...
The Singleton pattern guarantees that a class has only one unique instance and supplies a unified global entry point for accessing that instance. It is particularly useful when you need to strict control the number of object instances to save system resources or maintain consistent state. A valid Si...
Object Instantiation Mechanics In Python, object creation is a two-step process involving __new__ and __init__. The __new__ method is responsible for allocating memory and returning a new instance, while __init__ handles the initialization of that instance's attributes. When overriding __new__, you...