What parts does the web proxy pattern consist of

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structure

Participant

Listed in parentheses are the corresponding classes in the protection agent instance in the previous article.

Proxy (AccessorProxy)

Manage a reference so that the agent can access the entity. The Proxy in the resulting class diagram manages objects of type RealSubject, and Proxy can manage objects of type Subject if possible, so Proxy can be more versatile.

-provides the same interface as the Subject interface so that proxies can be used to replace entities. In other words, nothing seems to have changed from the customer.

-provide additional operations to meet customer needs according to requirements.

Subject (DbAccessor)

-define a common interface between RealSubject and Proxy so that Proxy can be used anywhere you use RealSubject. From the user's point of view, whether it's RealSubject or Proxy, it's the same.

RealSubject (RealAccessor)

-the entity represented by Proxy.

In the actual development, it is possible that the first thing that exists is the Subject that implements the function. When additional requirements arise (memory savings, access protection, etc.), the functionality of Subjec can be transferred to the new class RealSubject, and Subject itself becomes an abstract class. Next, define the Proxy according to the interface of Subject and give it to the user. This can be seen as an example of refactoring.

Collaboration

The agent forwards the request to the agent object at an appropriate time and manner in accordance with its duties.

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