Proxy Pattern in Go

The proxy pattern is a structural design pattern that controls access to the original object by introducing a proxy class, providing a proxy object for the original object to extend its functionality or add additional operations without changing the original object. The proxy pattern is commonly used to add extra functionality when accessing objects, such as permission control, caching, lazy loading, etc.

In the proxy pattern, the proxy class holds a reference to the original object and performs some additional operations when accessing the original object. The proxy class typically implements the same interface as the original object so that it can be used as a substitute for the original object. The proxy pattern can be divided into two types: static proxy and dynamic proxy.

Static proxy is a way to determine the proxy object at compile time, requiring a proxy class to be written for each original object. Dynamic proxy, on the other hand, creates proxy objects at runtime using Java’s reflection mechanism to dynamically generate proxy classes, eliminating the need to write a proxy class for each original object.

The proxy pattern can enhance code reusability and scalability, while also allowing for access control and reducing coupling with the original object. In practice, the proxy pattern is often used for purposes such as logging, performance monitoring, and access control.