用通俗的话理解设计模式-Template Method pattern

OracleDongDong

于 2012-08-09 10:07:06 发布

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分类专栏： Design Pattern StudyLog 文章标签：设计模式 class each

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本文深入探讨了模板方法模式的核心概念，包括其作为应用设计的清晰入口点，类似于抽象类的超类设计。通过多个小方法组成模板方法，每个步骤完成算法的一环。好莱坞原则在实现特定步骤时发挥作用，而钩子机制允许子类选择忽略不必要的步骤。

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The Template Method pattern is ubiquitous in the wild. It provide a clear enterpoint for the application design. This clear enterpoin is analogous to a superclass(which is an abstract class). The superclass contains a template method that is formed by several smaller methods. Each small method completes one step of an algorthim.

Thanks to this superclass design, the subclass couldn't change the sequence of the template method. It is helpful to decoupe the superclass and subclass. "Don't call me, I'll call you." this hollywood principle works very well in the template method pattern.

sometimes, one step method in the superclass's template method maybe a if-else scenario. the first situation is the subclass wants to run this specific step, it should proivde an implemtation of that method, likewise, if this steop is uneccesarry in the subclass, the subclass could choose ignoring this step. This feature of the template method pattern is named as hook.