© 2008 coreservlets.com SSpprriinngg AAOOPP Part 2 Originals of Slides and Source Code for Examples: http://courses.coreservlets.com/Course-Materials/spring.html Customized Java EE Training: http://courses.coreservlets.com/ Servlets, JSP, Struts, JSF/MyFaces/Facelets, Ajax, GWT, Spring, Hibernate/JPA, Java 5 & 6. Developed and taught by well-known author and developer. At public venues or onsite at yourlocation. © 2008 coreservlets.com For live Spring & Hibernate training, see courses att hhttttp:////courses.coreservlletts.com//. Taught by the experts that brought you this tutorial. AAvvaaiillaabbllee aatt ppuubblliicc vveennuueess, oorr ccuussttoommiizzeedd vveerrssiioonnss can be held on-site at your organization. •CCourses ddevellopedd andd ttaughhtt bby MMartty HHallll –Java 5, Java 6, intermediate/beginning servlets/JSP, advanced servlets/JSP, Struts, JSF, Ajax, GWT, custom mix of topics •Courses devCeulospteodm anizde tadu gJhatv bay EcoEre sTerrvaleintsi.ncogm: hextptepr:ts// c(eoduiterds ebsy. cMoarrteys)ervlets.com/ –Spring, Hibernate/JPA, EJB3, Ruby/Rails Servlets, JSP, Struts, JSF/MyFaces/Facelets, Ajax, GWT, Spring, Hibernate/JPA, Java 5 & 6. Developed and taught by well-kCnoowntna catu hthaollr@ acnodr deesveervloleptesr..c Aomt p fuobrl idce vtaeinlsues or onsite at yourlocation. Toppics in This Section • Implementing aspect behavior • AspectJ APIs and annotations • Spring AOP application 4 Java EE training: http://courses.coreservlets.com © 2008 coreservlets.com Aspect Behavior Customized Java EE Training: http://courses.coreservlets.com/ Servlets, JSP, Struts, JSF/MyFaces/Facelets, Ajax, GWT, Spring, Hibernate/JPA, Java 5 & 6. Developed and taught by well-known author and developer. At public venues or onsite at yourlocation. Asppect Behavior • Advice – Behavior to be applied to a set of program execution points –– IInn AAOOPP tteerrmmss, aaddvviiccee eennccaappssuullaatteess aa ccrroossss--ccuuttttiinngg interest, e.g. transaction management. Advisor beans are applied to pointcuts (a set of join points) • Spring advisor bean – Implementation •• PPOOJJOOss eennccooddiinngg aaddvviiccee – Integration (one of the following) • Special interfaces org.aopalliance.aop.Advice • Methods annotated with AspectJ annotations and defined with AspectJ parameters types 6 Java EE training: http://courses.coreservlets.com Advice Tyyppes • Before – Non-critical advisor bean type – Called before method execution • AAfftteerr rreettuurrnniinngg – Non-critical advisor bean type – Called after normal method execution • After throwing – Non-critical advisor bean type – CCaalllleedd aafftteerr mmeetthhoodd eexxeeccuuttiioonn eexxiittss wwiitthh aann eexxcceeppttiioonn • Around – Critical advisor bean tyyppe – Wraps method execution 7 Java EE training: http://courses.coreservlets.com © 2008 coreservlets.com Before Advice Customized Java EE Training: http://courses.coreservlets.com/ Servlets, JSP, Struts, JSF/MyFaces/Facelets, Ajax, GWT, Spring, Hibernate/JPA, Java 5 & 6. Developed and taught by well-known author and developer. At public venues or onsite at yourlocation. Before Advice • Interface – org.springframework.aop.MethodBeforeAdvice • Execution point – Before method execution • Type – Does not iinvokke methhodd – Non-critical unless an error is thrown 9 Java EE training: http://courses.coreservlets.com Before Advice Guidelines • Uses – Input validation – Auditing/logging • Exception type – Checked exceptions must be coordinated with the error siignatture off tthhe addviisedd bbean • Out-of-scope errors are re-thrown as java.lang.reflect.UndeclaredThrowableException – RuntimeException types may be used without precaution 10 Java EE training: http://courses.coreservlets.com Before Advice Process • Create new advice class – Implement (cid:129) org.springframework.aop.MethodBeforeAdvice –– FFuullffiillll (cid:129) before(method:Method, arguments:Object[], ttargett:OObbjjectt)):voiidd throws Throwable • Reggister advice as a Sppringg bean – • Reference from aspect – Associate with a pointcut • Integrate with Spring domain beans 11 Java EE training: http://courses.coreservlets.com Create Before Advice Class import java.lang.reflect.Method; iimmppoorrtt oorrgg..sspprriinnggffrraammeewwoorrkk..aaoopp..MMeetthhooddBBeeffoorreeAAddvviiccee;; public class BeforeLoggingAdvice implements MethodBeforeAdvice { public void before(Method method, Object[] args, OObbjjeecctt ttaarrggeett)) tthhrroowwss TThhrroowwaabbllee {{ Logger.getLogger(target.getClass()).debug( target.getClass().getSimpleName() + "#" + method.toGenericString() + ". args=" + Arrays.toString(args)); }} } 12 Java EE training: http://courses.coreservlets.com Reggister Before Advice Bean < <> 13 Java EE training: http://courses.coreservlets.com Reference From Asppect < AAddvviissoorr > 14 Java EE training: http://courses.coreservlets.com Domain Beans (cid:129) classpath:/coreservletsContext.xml <> <> Java EE training: http://courses.coreservlets.com Integrate Advice wwiitthh DDoommaaiinn BBeeaannss import org.springframework.context.support.*; public class Main { public static void main(String[]args) { BeanFactory beanFactory = new ClassPathXmlApplicationContext( "/coreservletsContext.xml", "//ccoorreesseerrvvlleettssAAooppCCoonntteexxtt.xxmmll"));; ... } } Java EE training: http://courses.coreservlets.com Access and Use Beans import org.springframework.context.support.*; public class Main { public static void main(String[]args) { BeanFactory beanFactory = new ClassPathXmlApplicationContext(new String[]{ "/coreservletsContext.xml", "//ccoorreesseerrvvlleettssAAooppCCoonntteexxtt.xxmmll"}}));; CustomerQuery query = (CustomerQuery) beanFactory.getBean("customerQuery"); Customer customer = query.getCustomerByName("Java Joe"); } } Standard output MockCustomerQuery#public abstract coreservlets.Customer coreservlets.CustomerQuery.getCustomerByName(java.lang.S tring). args=[Java Joe] Java EE training: http://courses.coreservlets.com © 2008 coreservlets.com AAfftter RRetturniing AAddvviiccee Customized Java EE Training: http://courses.coreservlets.com/ Servlets, JSP, Struts, JSF/MyFaces/Facelets, Ajax, GWT, Spring, Hibernate/JPA, Java 5 & 6. Developed and taught by well-known author and developer. At public venues or onsite at yourlocation. After Returningg Advice • Interface – org.spriingframework.aop.AfterReturniingAdviice • Execution point – AAfftteerr nnoorrmmaall mmeetthhoodd eexxeeccuuttiioonn aanndd eexxiitt • Type – Does not invoke method – Non-critical unless an error is thrown • Exception type – CChheecckkeedd eexxcceeppttiioonnss mmuusstt bbee ccoooorrddiinnaatteedd wwiitthh tthhee eerrrroorr signature of the advised bean • Out-of-scope errors are re-thrown as jjaavvaa.llaanngg.rreefflleecctt.UUnnddeeccllaarreeddTThhrroowwaabblleeEExxcceeppttiioonn – RuntimeException types may be used without precaution 19 Java EE training: http://courses.coreservlets.com After Returningg Advice • Create new advice class – Implement (cid:129) org.springframework.aop.AfterReturningAdvice – Fulfill (cid:129) afterReturning(returnValue:Object, method:Method, arguments:Object[], target:Object):void throws Throwable • RReeggiisstteerr aaddvviiccee aass aa SSpprriinngg bbeeaann – • Reference from aspect – Associate with a pointcut • Integrate with Spring domain beans 20 Java EE training: http://courses.coreservlets.com After Returningg Advice Class import java.lang.reflect.Method; iimmppoorrtt oorrgg..sspprriinnggffrraammeewwoorrkk..aaoopp.. AAfftteerrRReettuurrnniinnggAAddvviiccee;; public class BeforeLoggingAdvice implements AfterReturningAdvice { public void afterReturning(Object returnValue, Method method, OObbjjeecctt[[]] aarrggss, Object target) throws Throwable { Logger.getLogger(target.getClass()).debug( "exit=return[" + returnValue + "]"); } }} 21 Java EE training: http://courses.coreservlets.com

Spring AOP Part 2 - Custom Training Courses - Coreservlets.com

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