qwidget的专栏

Facade is a pattern which was referred to in so many books or articles. Here is a simple review of facade in POSA2, in which facade is called wrapper facade. For more details, refer to POSA2. They

This article is extracted from POSA2 as a reading note.The Active Object design pattern decouples method execution from method invocation

This article is extracted from POSA2 as a reading note.The Monitor Object design pattern synchronizes concurrent method execution to ensur

This article makes a brief introduction of the Half-Sync/Half-Async pattern from POSA2 as my reading note.The Half-Sync/Half-Async archite

This article outlined a global view of the Leader/Followers pattern  in POSA2 as my reading note.The Leader/Followers architectural patter

This article told the last pattern illustrated in POSA2 - Thread Specific Storage, which is such a common mechanism provided by some  operat

套用各种DP写一个系统，跑起来了，但后来发现真有变化来临的时候想扩展还得大规模改动甚至重写，这就是传说中的DP乱套了，达不到效果反而徒增工作量，内心惭愧，于是细读OO大师的设计信条，才慢慢明晓DP要怎么样实作才能真正达到效果，记下六大原则原文，肃清乱套之风，以作警戒。Si

模式大部分实现利用的是编程语言的继承多态等机制，以面向接口编程优先使用组合等等原则为实作的依归，把系统高内聚低耦合地划分了许多相对独立的类来实现拼装，模式套用多了难免出现很多类及各种子类，但却很大程度从结构上让系统的可维护性增强了，一般来说现在很多公司的OO系统就是这样做出来的。

阅读之前期望你已经懂得模板方法模式及单例模式的原理。通俗软件设计模式的表述呈现由GoF先行打响头炮，其后各种版本的模式书籍层出不穷，大多示范实现都是以有多态特性的虚函数作为核心，每一个virtual function call是间接进行的，如此一来性能会有小小的损耗，但可读性良好

This article is extracted from POSA2 as my reading note.See a familiar scene that all people experienced now and then: HTTP Cokkies. Web ser

This article is extracted from POSA2 as a reading note.I recall that I read an article argued about whether DCL is truely safe sometime. The

This article is extracted from POSA2 as a reading note.This pattern is really a shock for me. I met it in some projects before but I cannot

Refer to POSA2 for any details. This article is a simple review with some records that give me brain storming in the book. The Component Configurable design pattern also known as Service Configura

This pattern allows services to be added transparently to a framework and triggered automatically when certain events occur.  Concrete Framework : A concrete framework instantiates a generic and e

All contents are extracted from POSA2.  The Extension Interface design pattern allows multiple interfaces to be exported by a component, to prevent bloating of interfaces and breaking of client co

This article told a brief introduction of reactor illustrated in POSA2, so there are more you want to know, refer to POSA2.The Reactor architectural pattern allows event-driven applications to dem

This article is extracted from POSA2 as my reading note. The Proactor architectural pattern allows event-driven applications to efficiently

This article is extracted from POSA2 as a reading note.Superserver implementations, for example Inetd, Listen, and the Service Configurator

This article is extracted from POSA2 as a reading note.Scoped Locking is a pattern? I can't answer well until I read the associated portion

This article is extracted from POSA2 as a reading note.Strategized Locking is another pattern I was very familiar with through working with

两三天内读完PatternHatching小册子，有点小幸福。 从一个文件系统设计开始讲，使用composite建立树状模型，使用proxy处理连接，访问方式上用了visitor，文件保护上用了template method，多用户保护上用了扩展的singleton，组映射上用了mediator，真有点小壮观，如同all stars game一样让人兴奋。 接着作者又八了八sing