The singleton pattern is shown in figure 5 Singleton模式如图5所示。
Class an implementation of the singleton pattern , as only one instance of the 类成为单体模式的实现,因为在应用程序中只存在
We do this by applying the singleton pattern and creating a new class , commandfactory , as the singleton 既然我们已经访问了业务层,就需要建立commandfactory类。我们通过应用singleton模式,创造一个新类commandfactory 。
To facilitate this , the plug - in class implements the singleton pattern : it stores a reference to itself in a private class variable 为了使这一点更方便,插件类实现单模式( singleton pattern ) :它在私有类变量中存储一个自身的引用。
Classes definitions can now include static members ( properties ) , accessible via the class . common usage of static members is in the singleton pattern 类定义现在包含了静态成员(属性)的定义,并通过类访问它们。通常静态成员用于单独的部分。
In software engineering, the singleton pattern is a design pattern that restricts the instantiation of a class to one object. This is useful when exactly one object is needed to coordinate actions across the system.