博客指出复杂应用会使外观的 API 过大，限制其有效性。以示例应用为例，宠物商店应用在外观之上实现命令模式，而非继续向会话外观类添加方法。命令模式将每个应用功能封装在单独类中，用命令模式实现控制器可简化会话外观接口，使实现更简洁。
A facade's effectiveness is limited, since complex applications can cause the facade's API to grow too large. This is the case with the sample application. Rather than continuing to add methods to the session facade class, the petstore application implements a command pattern on top of the facade. A command pattern encapsulates each application function in a separate class. Each command instance represents a single request for an application service along with data necessary to perform the service.
Implementing a controller with a command pattern not only simplifies a session facade interface , it also keeps the controller implementation cleaner by encapsulating event- and request-handling tasks into smaller objects.
Implementing a controller with a command pattern not only simplifies a session facade interface , it also keeps the controller implementation cleaner by encapsulating event- and request-handling tasks into smaller objects.
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