Interceptor: A very useful Design Pattern!

In this period of almost 9 years as a developer, one of the project patterns that helped me the most in many moments was Interceptor. This pattern combined with the aspect-oriented programming (AOP) paradigm makes it much easier to apply behaviors, filters, among other devices applicable to systems, especially web ones.

It is a standard adopted by several existing resources/tools and many of them used on a daily basis, such as Spring Security. Spring's security module intercepts all requests and relies on information from the request to validate authentication and/or authorization.

Security is an example, there are others like @ControllerAdvice @ExceptionHandler, in web layers RequestInterceptor or ResponseInterceptor (Spring Web, RestTemplate and Feign), Hibernate interceptor, etc...

I mentioned interceptor applications in Java library resources... but resources/tools/frameworks from other languages ​​also have Interceptor applications!

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