【Design Pattern】Strctural - Composite

动机

希望表达具有层次结构（部分-整体，part-whole）的实体
对调用者来说，叶子元素和复合元素都是一样的

...

Posted by Wei on 2018-11-12, Last Modified on 2025-04-23

【Design Pattern】Structural - Adapter

Adapter Pattern

The adapter design pattern solves problems like:
- How can a class be reused that does not have an interface that a client requires?
- How can classes that have incompatible interfaces work together?
- How can an alternative interface be provided for a class?
Often an (already existing) class can’t be reused only because its interface doesn’t conform to the interface clients require.

...

Posted by Wei on 2018-11-12, Last Modified on 2025-04-23

【Design Pattern】Structural - Flyweight/ Object Pool

1 动机

通过尽可能共享对象中的数据来实现对内存的最小化使用，这就是享元模式的动机。

一个典型的例子是：在Word中，对字符的图形化展现。如果每一个显示的字符都对应一个独立的对象，这将会消耗大量的内存。取而代之，位于文档中不同位置的相同字符会共享大部分属性，而只有字符位置这样的属性才需要被单独保存。

...

Posted by Wei on 2018-11-11, Last Modified on 2025-04-23

【Design Pattern】Behavioural - Observer

1 定义

观察者模式（Observer Pattern）定义了一种一对多的依赖对象关系，使得当那一个对象状态发生改变时，依赖它的多个对象均能得到通知并自动更新（做出相应反应）。

...

Posted by Wei on 2018-11-11, Last Modified on 2025-04-23

【Design Pattern】Behavioural - Chain of Responsibility Pattern

Intent

Chain of Responsibility is a behavioral design pattern that lets you pass requests along a chain of handlers. Upon receiving a request, each handler decides either to process the request or to pass it to the next handler in the chain.

...

Posted by Wei on 2018-11-11, Last Modified on 2023-08-23

西维蜀黍