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Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
Spring framework aop
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Spring framework aop

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  • 1. Spring Framework AOP 2st WEEK 30 Jun GEEKY ACADEMY 2013
  • 2. 2 | GEEK ACADEMY 2013 INSTRUCTOR TEAM SALAHPIYA Salah (Dean) Chalermthai Siam Chamnan Kit SChalermthai@sprint3r.com Piya (Tae) Lumyong - piya.tae@gmail.com
  • 3. 3 | GEEK ACADEMY 2013 Topic • Intro to AOP • Basic AOP Concepts • Getting Started with Spring AOP
  • 4. Introduction to AOP GEEK ACADEMY 2013
  • 5. 5 | GEEK ACADEMY 2013 Intro to AOP • Why worrying about Crosscutting Concerns? • What AOP Does? • Crosscutting Concerns • Example
  • 6. 6 | GEEK ACADEMY 2013 Why worrying about Crosscutting Concerns? public void withdraw(long accId, int amount) { Account account = (Account)session.get(Account.class, accId); double balance = account.getBalance(); balance = balance - amount; account.setBalance(balance); session.save(balance); } Business
  • 7. 7 | GEEK ACADEMY 2013 Why worrying about Crosscutting Concerns? public void withdraw(long accId, int amount) { if (hasPermission(accId)) { Account account = (Account)session.get(Account.class, accId); double balance = account.getBalance(); balance = balance - amount; account.setBalance(balance); session.save(balance); } else { throw new SecurityException("Access Denied"); } } Business Permission
  • 8. 8 | GEEK ACADEMY 2013 Why worrying about Crosscutting Concerns? public void withdraw(long accId, int amount) { if (hasPermission(accId)) { bankLogger.info(accId + " withdrow amount " + amount); Account account = (Account)session.get(Account.class, accId); double balance = account.getBalance(); balance = balance - amount; account.setBalance(balance); session.save(balance); } else { throw new SecurityException("Access Denied"); } } Business Permission Logger
  • 9. 9 | GEEK ACADEMY 2013 Why worrying about Crosscutting Concerns? public void withdraw(long accId, int amount) { if (hasPermission(accId)) { bankLogger.info(accId + " withdrow amount " + amount); Transaction tx = null; try { Transaction tx = session.beginTransaction(); Account account = (Account)session.get(Account.class, accId); double balance = account.getBalance(); balance = balance - amount; account.setBalance(balance); session.save(balance); tx.commit(); } catch(RuntimeException ex) { if (tx!=null) tx.rollback; } } else { throw new SecurityException("Access Denied"); } } Business Permission Logger Transaction
  • 10. 10 | GEEK ACADEMY 2013 Why worrying about Crosscutting Concerns? Business Permission Logger Transaction Service A Service B Service C
  • 11. 11 | GEEK ACADEMY 2013 Why worrying about Crosscutting Concerns? • Too many relationship to the crosscutting objects • Code is still required in all methods • Cannot all be changed at one
  • 12. 12 | GEEK ACADEMY 2013 What AOP Does? • AOP will separate the Crosscutting concerns from the System
  • 13. 13 | GEEK ACADEMY 2013 Crosscutting Concerns public void withdraw(int amount) { balance = balance - amount; } public void deposit(int amount) { balance = balance + amount; } Logger bankLogger.info("Withdraw " + amount); bankLogger.info("Withdraw " + amount); Transaction tx.commit(); tx.commit(); tx.begin(); tx.begin(); Ref AOP Spring
  • 14. 14 | GEEK ACADEMY 2013 Cross-Cutting Concerns Examples • Logging and Tracing • Transaction Management • Security • Caching • Error Handling • Performance Monitoring • Custom Business Rules
  • 15. Basic AOP Concepts GEEK ACADEMY 2013
  • 16. 16 | GEEK ACADEMY 2013 Basic AOP Concepts • What is AOP? • AOP Terminology • Advice • How Spring AOP Works • AOP and OOP • Leading AOP Technologies
  • 17. 17 | GEEK ACADEMY 2013 What is AOP? • is a programming paradigm • extends OOP • enables modularization of crosscutting concerns • is second heart of Spring Framework
  • 18. 18 | GEEK ACADEMY 2013 AOP Terminology
  • 19. 19 | GEEK ACADEMY 2013 AOP Terminology • Joinpoint – Defines A Point During the Execution of a program. We can insert Additional logics at Joinpoints • Advice – Action taken(Functionality) at a Joinpoint. • Pointcut – Combination of Joinpoints where the Advice need to be Applied.
  • 20. 20 | GEEK ACADEMY 2013 AOP Terminology • Aspect – a modularization of a Crosscutting concern. • Target object - object being advised by one or more aspects. • AOP proxy – Will manage the way of Applying Aspects at particular Pointcuts. PointCut Advice PointCut Advice PointCut Advice Aspect Target Object Proxy Call
  • 21. 21 | GEEK ACADEMY 2013 AOP Weaving • Process of applying aspects to a target object • Will create a proxied object
  • 22. 22 | GEEK ACADEMY 2013 How AOP Works • Write your mainline application logic (Solve core problem) • Write aspects to implement cross-cutting concerns (Write aspects) • Bind it all together (Weave at runtime)
  • 23. 23 | GEEK ACADEMY 2013 AOP and OOP • Aspect – code unit that encapsulates pointcuts, advice, and attributes • Pointcut – define the set of entry points (triggers) in which advice is executed • Advice – implementation of cross cutting concern • Weaver – construct code (source or object) with advice • Class – code unit that encapsulates methods and attributes • Method signature – define the entry points for the execution of method bodies • Method bodies – implementation of the business logic concerns • Compiler – convert source code to object code AOP OOP
  • 24. 24 | GEEK ACADEMY 2013 Leading AOP Technologies • AspectJ – 1995, original AOP technology – Offers a full Aspect Oriented Programming language – Modifies byte code to add aspects into your application! • Spring AOP – Uses dynamic proxies to add aspects into your application – Only spring beans can be advised – Uses some of AspectJ expression syntax
  • 25. Getting Started with Spring AOP GEEK ACADEMY 2013
  • 26. 26 | GEEK ACADEMY 2013 Getting Started with Spring AOP • Spring AOP • Aspect • Pointcut • Advice • Bean in Spring container • How it really works • Additional • Spring AOP vs AspectJ • @AspectJ vs XML
  • 27. 27 | GEEK ACADEMY 2013 Spring AOP • Implemented in pure java • No need for a special compilation process • Supports only method execution join points • Only runtime weaving is available • AOP proxy – JDK dynamic proxy – CGLIB proxy • Configuration – @AspectJ annotation-style – Spring XML configuration-style
  • 28. 28 | GEEK ACADEMY 2013 @Aspect @Aspect public class LoggingAspect { ... } <aop:aspectj-autoproxy /> <bean class="mypackage.LoggingAspect" />
  • 29. 29 | GEEK ACADEMY 2013 Pointcut
  • 30. 30 | GEEK ACADEMY 2013 Pointcut • @Pointcut • Pointcut expression • Pointcut designators • Example
  • 31. 31 | GEEK ACADEMY 2013 @Pointcut @Aspect public class LoggingAspect { @Pointcut("execution(* mypackage.service..*.*(..))") public void ifService() {} @Pointcut("execution(* mypackage.repository..*.*(..))") public void ifRepository() {} ... }
  • 32. 32 | GEEK ACADEMY 2013 Pointcut expression • PCD - Pointcut designators. • method scope – Advice will be applied to all the methods having this scope. For e.g., public, private, etc. Spring AOP only supports advising public methods. • return type – Advice will be applied to all the methods having this return type. PCD(<method scope> <return type> <declaring type>.<name(param)> <throw>)
  • 33. 33 | GEEK ACADEMY 2013 Pointcut expression(2) • declaring type – Advice will be applied to all the methods of this type. If the class and advice are in the same package then package name is not required • name(param) – Filter the method names and the argument types. Two dots(..) means any number(0-more) and type of parameters. • throw PCD(<method scope> <return type> <declaring type>.<name(param)> <throw>)
  • 34. 34 | GEEK ACADEMY 2013 Pointcut designators • Code based – execution (Method Patterns) • the primary pointcut designator you will use when working with Spring AOP – within (Type Patterns) • within certain types (simply the execution of a method declared within a matching type when using Spring AOP) – target • where the target object (application object being proxied) is an instance of the given type
  • 35. 35 | GEEK ACADEMY 2013 Pointcut designators(2) • Code based(2) – this • where the bean reference (Spring AOP proxy) is an instance of the given type – args • where the arguments are instances of the given types – bean (Bean Name Patterns) • to a particular named Spring bean, or to a set of named Spring beans (when using wildcards)
  • 36. 36 | GEEK ACADEMY 2013 Pointcut designators(3) • Annotation based – @annotation • where the subject of the join point (method being executed in Spring AOP) has the given annotation – @within • within types that have the given annotation (the execution of methods declared in types with the given annotation when using Spring AOP)
  • 37. 37 | GEEK ACADEMY 2013 Pointcut designators(4) • Annotation based(2) – @target • where the class of the executing object has an annotation of the given type – @args • where the runtime type of the actual arguments passed have annotations of the given type(s)
  • 38. 38 | GEEK ACADEMY 2013 Pointcut example • the execution of any public method: execution(public * *(..)) • the execution of any method with a name beginning with “set”: execution(* set*(..)) • the execution of any method defined by the MyService interface execution(* com.xyz.service.MyService.*(..)) • the execution of any method defined in the service package: execution(* com.xyz.service.*.*(..)) • the execution of any method defined in the service package or a sub-package: execution(* com.xyz.service..*.*(..))
  • 39. 39 | GEEK ACADEMY 2013 Pointcut example(2) • any join point (method execution only in Spring AOP) WITHIN the service package: within(com.xyz.service.*) • any join point (method execution only in Spring AOP) within the service package or a sub-package: within(com.xyz.service..*) • any join point (method execution only in Spring AOP) where the proxy implements the AccountService interface: this(com.xyz.service.AccountService)
  • 40. 40 | GEEK ACADEMY 2013 Pointcut example(3) • Other example – Pointcut example - Spring Framework Reference
  • 41. 41 | GEEK ACADEMY 2013 Advice
  • 42. 42 | GEEK ACADEMY 2013 Advice • Advice types • @Before • @After • @AfterReturning • @AfterThrowing • @Around
  • 43. 43 | GEEK ACADEMY 2013 Advice • Action teken at particular Joinpoint is called as an Advice • Defines What needs to be Applied and When – What – Functionality – When – Advice Type
  • 44. 44 | GEEK ACADEMY 2013 Advice types • Before • After • After Returning • After Throwing • Around Method Return Throw Success call Call
  • 45. 45 | GEEK ACADEMY 2013 @Before @Aspect public class LoggingAspect { @Pointcut("execution(* *(..))") public void ifService() {} @Before("ifService()") public void logBefore(JoinPoint joinPoint) { ... } ... }
  • 46. 46 | GEEK ACADEMY 2013 @After @Aspect public class LoggingAspect { @Pointcut("execution(* *(..))") public void ifService() {} @After("ifService()") public void logAfter(JoinPoint joinPoint) { ... } ... }
  • 47. 47 | GEEK ACADEMY 2013 @AfterReturning @Aspect public class LoggingAspect { @Pointcut("execution(* *(..))") public void ifService() {} @AfterReturning(pointcut = "ifService()", returning = "result") public void logAfterReturning(JoinPoint joinPoint, Object result) { ... } ... }
  • 48. 48 | GEEK ACADEMY 2013 @AfterThrowing @Aspect public class LoggingAspect { @Pointcut("execution(* *(..))") public void ifService() {} @AfterThrowing(pointcut = "ifService()", throwing = "error") public void logAfterThrowing(JoinPoint joinPoint, Throwable error) { ... } ... }
  • 49. 49 | GEEK ACADEMY 2013 @Around @Aspect public class LoggingAspect { @Pointcut("execution(* *(..))") public void ifService() {} @Around("ifService()") public Object logAround(ProceedingJoinPoint joinPoint) throws Throwable { ... Object result = joinPoint.proceed(); ... return result; } ... }
  • 50. 50 | GEEK ACADEMY 2013 Security Bean in Spring container Logging Caching Target Object
  • 51. 51 | GEEK ACADEMY 2013 How it really works (TX example)
  • 52. 52 | GEEK ACADEMY 2013 LAB1 Basic Spring AOP
  • 53. 53 | GEEK ACADEMY 2013 LAB1 Basic Spring AOP Target Object Logging
  • 54. 54 | GEEK ACADEMY 2013 Links • SpringSource • Spring Reference 3.2 • Thank for – Dmitry Noskov – chamilavt – Java Brains
  • 55. 55 | GEEK ACADEMY 2013 Books
  • 56. GEEK ACADEMY 2013
  • 57. THANK YOU FOR YOUR TIME GEEK ACADEMY 2013

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