Spring AOP | Code Factory

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Jan 29, 2021

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• * AOP means Aspect Oriented Programming. The main aim of AOP is maintain independent business layer and service layer, seperate services from business.
  - Aspect = A service.
  - Advice = Service provider.
  - Point cut = A point/condition to execute aspects for business methods.
  - Advisor = Point cut with advice combination. Point cut + Advice
  - Proxy = A weaver. It will combine services code along with your business code.
• * To add services to business, AOP we have 3 approaches.
  - Programmatic approach
  - Declarative approach
  - Annotations approach
• * There are 4 types of advices in Spring AOP
  - MethodBeforeAdvice: Before Advice it is executed before the actual method call.
  - AfterReturningAdvice: After Advice it is executed after the actual method call. If method returns a value, it is executed after returning value.
  - MethodInterceptor: Around Advice it is executed before and after the actual method call.
  - ThrowsAdvice: Throws Advice it is executed if actual method throws exception.
• ProxyFactoryBean is used to apply interceptor logic to an existing target bean, so that when methods on that bean are invoked, the interceptors are executed before-and-after that method call. This is an example of Aspect Oriented Programming (AOP).

1. Spring AOP — Before Advice
2. Spring AOP — After Returning Advice
3. Spring AOP — Around Advice
4. Spring AOP — Throwing Advice
5. Spring AOP — Befor, After, Around Advice
6. Spring AOP — Pointcut