Spring AOP

AOP : Aspect oriented programming

BANK Business Operation à withdraw, deposit, tax

Service à Transaction, security, JMS, Mail service

To separate Business and service logics we use AOP

Service + Business à AOP à Proxy à Controller à Viewpage

1.       Buzzwords

·         Aspect à a service

·         Advice à Service provider

·         Point cut à a point / a condition to execute aspects for business methods

·         Advice à point cut with advice combination

·         Proxy à weaver means combine. It combines Service and Business and returns Proxy

·         Target à Business Object.

We can do by

·    Programmatic

·    Xml

·    Annotations

2.      Types of Advices

·    Service may execute BEFORE business Logic à methodBeforeAdvice (before(obj[], Method m ))

·    Service may execute AFTER business Logic  àAfterReturningAdvice

·    Service may execute BEFORE and AFTER business Logic  à MethodInterceptor

·         proceed() method differentiatres the BEFORE n AFTER code Excecution

·    Service may execute EXCEPTION in business Logic  à ThrowsAdvice

·    All are Interfaces.

·    All are Advices

At Runtime Service and Business must combine. These are called PROXYS

We  have ProxyFactoryBean

è ProxyFactoryBean p = new ProxyfactoryBean();

è p.setTarget(BusinessObj)

è p/setInterceptorNmaes(services[])

è BankProxy bp = pb.getObject() àChild class of Business Object

·         StaticMathodMatcherPointcut

·         NamematchMathodPointcut

3.       Advicers

DefaultPointcutAdvicers

RegularExpressionMethodPointcutAdvicer