This document discusses Spring Aspect Oriented Programming (AOP). It defines key AOP concepts like joinpoints, pointcuts, advice, and aspects. It provides examples of using AOP in Spring to add logging and transaction handling advice to methods. The advice is defined and configured using an advisor bean, and a proxy is created to apply the advice transparently at runtime.

1. Spring AOPAspect Oriented ProgrammingBySrinivasReddy.Swww.java9s.com

2. Cross Cutting Concernsclass Bank{ private int balance; public void withdraw(int amount){bankLogger.info(“Withdraw –”+amount);tx.begin(); balance = this.balance-amount;accountDao.saveBalance(balance);tx.commit(); }}www.java9s.com

3. Cross Cutting ConcernsApplication ModulesApplication ModulesApplication ModulesApplication ModulesApplication Moduleswww.java9s.com

4. Cross Cutting ConcernsLoggingTransactionApplication ModulesApplication ModulesApplication ModulesSpring Frameworkwww.java9s.com

5. AOP – Definitions.Aspect

6. Joinpoint

7. Advice

8. Pointcut

9. Introduction

10. Target Object

11. AOP Proxy

12. Weavingwww.java9s.com

13. AOP – Definitions.LoggerAdviceAdvisorMethodMethodMethodJoinpointsAdvisorTransaction Manager www.java9s.com

14. AOP - DefinitionsAdvice defines what needs to be applied and when.Jointpoint is where the advice is applied.Pointcut is the combination of different joinpoints where the advice needs to be applied.Aspect is applying the Advice at the pointcuts.www.java9s.com

15. Advice TypesBefore AdviceAfter returning AdviceAround AdviceThrows AdviceMethodMethodMethodMethodExceptionwww.java9s.com

16. AOP - WeavingCompile timeClass Load TimeRuntime – Springs wayCallerTargetProxywww.java9s.com

17. Pointcut and AdvisorPOINTCUT CLASSES:Perl5RegexpMethodPointcutJdkRegexpMethodPointcutPointcut and Advisor in one class:RegexpMethodPointcutAdvisorwww.java9s.com

18. Examplepublic class CustomerImpl implements Customer{public void browse(){System.out.println("Browsing the internet");}}class CafeOwner{ void LogInTime(){System.out.println(“Log In time and name of the customer”);} void LogOutTime(){System.out.println(“Log Out Time”);} void issueUsageBill(){System.out.println(“Calculate and bill the customer”);}}www.java9s.com

19. Before Advice -MethodBeforeAdviceclass InternetAdvisor implements MethodBeforeAdvice{private CafeOwner cafeOwner;public void before(Method arg0, Object[] arg1, Object arg2)throws Throwable {this.getCafeOwner().LogInTime();}}www.java9s.com

20. Customer ProxyCallerTarget objectCustomerImplproxyInterfaceCustomerRegexpMethodPointcutAdvisor“*” – Apply to all methodsCafeOwnerInternetAdvice implements MethodBeforeAdvice

21. ConfigurationStep 1: Configure the Beans<bean id ="customerImpl" class ="CustomerImpl"/><bean id = "cafeOwner" class ="CafeOwner"/><bean id ="internetAdvice" class ="InternetAdvice"><property name ="cafeOwner" ref ="cafeOwner"/></bean>www.java9s.com

22. ConfigurationStep 2: Configure the POINTCUT ADVISOR<bean id ="cafeOwnerBeforeAndAfterAdvice" class ="org.springframework.aop.support.RegexpMethodPointcutAdvisor"> <property name ="advice"> <ref local ="internetAdvice"/></property><property name ="pattern"><value>.*</value></property> </bean>www.java9s.com

23. ConfigurationStep 3: Configure the ProxyFactoryBean<bean id ="customerProxy" class ="org.springframework.aop.framework.ProxyFactoryBean"><property name ="target"> <ref local ="customerImpl"/> </property> <property name ="proxyInterfaces"> <value>Customer</value> </property> <property name ="interceptorNames"> <list> <value>cafeOwnerBeforeAndAfterAdvice</value> </list> </property></bean>www.java9s.com

24. RememberSpring Does not support AOP forMethods marked as final.Fieldswww.java9s.com

25. WWW.JAVA9S.COM