1. Spring AOPAspect Oriented Programming By SrinivasReddy.S www.java9s.com

2. Cross Cutting Concerns class 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 Concerns Application Modules Application Modules Application Modules Application Modules Application Modules www.java9s.com

4. Cross Cutting Concerns Logging Transaction Application Modules Application Modules Application Modules Spring Framework www.java9s.com

6. Joinpoint

7. Advice

8. Pointcut

9. Introduction

10. Target Object

11. AOP Proxy

12. Weavingwww.java9s.com

13. AOP – Definitions. Logger Advice Advisor Method Method Method Joinpoints Advisor Transaction Manager www.java9s.com

14. AOP - Definitions Advice 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 Types Before Advice After returning Advice Around Advice Throws Advice Method Method Method Method Exception www.java9s.com

16. AOP - Weaving Compile time Class Load Time Runtime – Springs way Caller Target Proxy www.java9s.com

17. Pointcut and Advisor POINTCUT CLASSES: Perl5RegexpMethodPointcut JdkRegexpMethodPointcut Pointcut and Advisor in one class: RegexpMethodPointcutAdvisor www.java9s.com

18. Example public 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 -MethodBeforeAdvice class 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 Proxy Caller Target object CustomerImpl proxyInterface Customer RegexpMethodPointcutAdvisor “*” – Apply to all methods CafeOwner InternetAdvice implements MethodBeforeAdvice

21. Configuration Step 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. Configuration Step 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. Configuration Step 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. Remember Spring Does not support AOP for Methods marked as final. Fields www.java9s.com

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