使用工厂而不是构造函数创建对象的阈值是多少？ [英] What is your threshold to use factory instead of a constructor to create an object?

问题描述

1. 您始终使用工厂。
您使用工厂而不是构造函数创建对象的阈值是多少？

2. 只有在您检查null时，您才能使用工厂。


3. 您始终使用构造函数


4. 您很少使用工厂...这些情况是什么？

利弊

更新：我在项目中从域驱动设计应用工厂模式。创建工厂背后的原因之一是减少域模型中的噪音。

谢谢

解决方案

如果我有一个抽象基类（或接口）和几个具体的派生类，并且有一些逻辑根据哪一个具体类被创建。我在工厂里实现这个逻辑。

What is your threshold to use factory instead of a constructor to create an object?

1. You always use factory.
2. You use factories only if you have invariant checks other than checking for nulls.
3. You always use constructors
4. You rarely use factories... what are those cases??

pros and cons

Update: I am applying factory pattern from Domain Driven Design in my project. And one of the reason behind creating factories is to reduce noise in the domain model.

Thanks

解决方案

I use a factory if I have an abstract base class (or an interface), and several concrete derived classes, and there is some logic according to which one of concrete classes is created. I implement that logic in the factory.

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