Table Of Content© 2008 coreservlets.com
SSpprriinngg AAOOPP
Part 2
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Toppics in This Section
• Implementing aspect behavior
• AspectJ APIs and annotations
• Spring AOP application
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Aspect Behavior
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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
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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
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Before Advice
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Before Advice
• Interface
– org.springframework.aop.MethodBeforeAdvice
• Execution point
– Before method execution
• Type
– Does not iinvokke methhodd
– Non-critical unless an error is thrown
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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
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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
– <bean/>
• Reference from aspect
– Associate with a pointcut
• Integrate with Spring domain beans
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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));
}}
}
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Reggister Before Advice Bean
<?xml version="1.0" encoding="UTF-8"?>
<<bbeeaannss xxmmllnnss="hhttttpp::////wwwwww..sspprriinnggffrraammeewwoorrkk..oorrgg//sscchheemmaa//bbeeaannss"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
hhttp:////www.spriingfframeworkk.org//schhema//bbeans//spriing-bbeans-22.55.xsdd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
<bean id="beforeLoggingAdvice"
class="coreservlets.BeforeLoggingAdvice" />
<<//bbeeaannss>>
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Reference From Asppect
<?xml version="1.0" encoding="UTF-8"?>
<<bbeeaannss xxmmllnnss="hhttttpp::////wwwwww..sspprriinnggffrraammeewwoorrkk..oorrgg//sscchheemmaa//bbeeaannss"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
hhttp:////www.spriingfframeworkk.org//schhema//bbeans//spriing-bbeans-22.55.xsdd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
AAddvviissoorr
<bean id="beforeLoggingAdvice" reference
class="coreservlets.BeforeLoggingAdvice" />
<aop:config>
<aop:poiinttcutt iidd=""custtomerQQueryPPoiinttcutt""
expression="execution(* coreservlets.CustomerQuery.*(..))" />
<aop:advisor advice-ref="beforeLoggingAdvice"
ppooiinnttccuutt-rreeff="ccuussttoommeerrQQuueerryyPPooiinnttccuutt" //>>
</aop:config>
</beans>
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Domain Beans
(cid:129) classpath:/coreservletsContext.xml
<beans>
<bean id="customerQuery" class="coreservlets.MockCustomerQuery">
<<ccoonnssttrruuccttoorr-aarrgg>>
<list>
<bean class="coreservlets.Customer">
<property name="id" value="jjoe" />
<property name="name" value="Java Joe" />
</bean>
<bean class="coreservlets.Customer">
<<pprrooppeerrttyy nnaammee==""iidd"" vvaalluuee==""jjjjoohhnn"" //>>
<property name="name" value="Java John" />
</bean>
</list>
</constructor-arg>
</bean>
</beans>
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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"));;
...
}
}
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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]
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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
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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
– <bean/>
• Reference from aspect
– Associate with a pointcut
• Integrate with Spring domain beans
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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 + "]");
}
}}
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Description:Spring AOP. Part 2. Originals of Slides and Source Code for Examples: http://
courses.coreservlets.com/Course-Materials/spring.html. Customized Java EE
