Spring 5 Design Patterns

Decorator design pattern in the Spring Framework

The Spring Framework uses the Decorator design pattern to build important functionalities such as transactions, cache synchronization, and security-related tasks. Let's look at some functionalities where Spring implements this pattern transparently:

• Weaving the advice into the Spring application. It uses the Decorator pattern via the CGLib proxy. It works by generating a subclass of the target class at runtime.
• BeanDefinitionDecorator : It is used to decorate the bean definition via applied custom attributes.
• WebSocketHandlerDecorator: It is used to decorate a WebSocketHandler with additional behaviors.

Now let's turn to another GOF Design Pattern - Facade design pattern.