ProxyFactory를 이용한 프로그램을 통한 AOP구현예제(Spring Framework3.X AOP구현하기,Advice, Pointcut)
- 다음과 같은 인터페이스와 타겟 클레스가 있다.
interface OnjWorld {
public void onjHello();
public void onjHello2();
}
public class OnjWorldImpl implements OnjWorld {
public void onjHello() {
System.out.println("OnJ에오신것을 환영합니다.");
}
public void onjHello2() {
System.out.println("OnJ2에오신것을 환영합니다.");
}
}
위 OnjWorldImpl이 타겟 클래스이다. onjHello2 로 시작하는 메소드에 스프링 충고를 내릴려고 한다.
충고(Advice)는 적당히 콘솔화면에 출력하는 정도로 만들고...
before advice, around advice, throws advice, ,after returning advice를 구현하시오.
- 프로그래밍적인 방법으로 구현해 보았다.
정적인
클래스 이름과 메소드 이름으로 포인트컷을 만들기 위해 StaticMethodMatcherPointcut을 상속해서 포인트컷을 만들었고...
기존
예제와 다든 점은 하나의 어드바이스에 충고가 여러개인 경우를 처리하는 방법입니다.
OnjClient.java 예제를 참고하세요.
0.0 인터페이스
OnjWorld.java
package
onj.aop.programming;
interface OnjWorld
{
public
void onjHello();
public
void onjHello2() throws Exception;
}
0.1 인터페이스 구현 클래스
OnjWorldImpl.java
package
onj.aop.programming;
public class OnjWorldImpl
implements OnjWorld {
public
void onjHello() {
System.out.println("OnJ에오신것을
환영합니다.");
}
public
void onjHello2() throws Exception {
System.out.println("OnJ2에오신것을
환영합니다.");
throw
new Exception("OnJ Exception...");
}
}
1.AfterLoggingAdvice.java
package
onj.aop.programming;
import
java.lang.reflect.Method;
import
org.springframework.aop.AfterReturningAdvice;
public class
AfterLoggingAdvice implements AfterReturningAdvice {
public
void afterReturning(Object arg0, Method arg1, Object[] arg2,
Object
arg3) throws Throwable {
System.out.println(arg1.getName()
+ ":: 사후충고");
}
}
2.
AroundLoggingAdvice.java
package
onj.aop.programming;
import
org.aopalliance.intercept.MethodInterceptor;
import
org.aopalliance.intercept.MethodInvocation;
public class
AroundLoggingAdvice implements MethodInterceptor {
public
Object invoke(MethodInvocation arg0) throws Throwable {
System.out.println("메소드실행전...");
Object
returnedObj = arg0.proceed();
System.out.println("메소드실행후...");
return
returnedObj;
}//
:}///~
}
3.
BeforeLoggingAdvice.java
package
onj.aop.programming;
import
java.lang.reflect.Method;
import
org.springframework.aop.MethodBeforeAdvice;
public class
BeforeLoggingAdvice implements MethodBeforeAdvice{
public
void before(Method arg0, Object[] arg1, Object arg2)throws
Throwable{
System.out.println(arg0.getName()
+ "::: 사전충고");
}
}
4.
ThrowsLoggingAdvice.java
package
onj.aop.programming;
import
org.springframework.aop.ThrowsAdvice;
public class
ThrowsLoggingAdvice implements ThrowsAdvice {
public
void afterThrowing(Throwable throwable) {
System.out.println(">>>>>>>>
에러발생 " + throwable);
}
}
5. 이번에는 포인트컷이다.
SimpleStaticPointcut.java
package
onj.aop.programming;
import
java.lang.reflect.Method;
import
org.springframework.aop.ClassFilter;
import
org.springframework.aop.support.StaticMethodMatcherPointcut;
public class
SimpleStaticPointcut extends StaticMethodMatcherPointcut {//
아래는First.class의one()메소드일때충고가적용된다.
public
boolean matches(Method method, Class<?> cls) {
return
("onjHello2".equals(method.getName()));
}
public
ClassFilter getClassFilter() {
return
new ClassFilter() {
public
boolean matches(Class<?> cls) {
return
(cls == OnjWorldImpl.class);
}
};
}
}
6. 실행을 위한 클라이언트 프로그램
OnjClient.java
충고가 여러개인 경우 충고마다 Advisor를 만들어서 ProxyFactory에 여러
Advisor
넣었습니다.
package
onj.aop.programming;
import
org.aopalliance.aop.Advice;
import
org.springframework.aop.Advisor;
import
org.springframework.aop.Pointcut;
import
org.springframework.aop.framework.ProxyFactory;
import
org.springframework.aop.support.DefaultPointcutAdvisor;
public class OnjClient
{
public
static void main(String[] args) {
OnjWorldImpl
target = new OnjWorldImpl();
ProxyFactory
pf = new ProxyFactory();
Pointcut
pc = new SimpleStaticPointcut();
Advice
before = new BeforeLoggingAdvice();
Advice
after = new AfterLoggingAdvice();
Advice
around = new AroundLoggingAdvice();
Advice
throwsAdvice = new ThrowsLoggingAdvice();
Advisor
advisor1= new DefaultPointcutAdvisor(pc,before);
Advisor
advisor2= new DefaultPointcutAdvisor(pc,after);
Advisor
advisor3= new DefaultPointcutAdvisor(pc,around);
Advisor
advisor4= new DefaultPointcutAdvisor(pc,throwsAdvice);
pf.addAdvisors(advisor1,advisor2,
advisor3, advisor4);
pf.setTarget(target);
try
{
OnjWorld
proxy = (OnjWorld) pf.getProxy();
proxy.onjHello();
proxy.onjHello2();
}
catch (Exception e) {
e.printStackTrace(System.out);
}
}
}
7.
결과
SLF4J: Class path contains
multiple SLF4J bindings.
SLF4J: Found binding in
[jar:file:/C:/java/lib/slf4j-log4j12-1.7.5.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in
[jar:file:/C:/Documents%20and%20Settings/Administrator/.m2/repository/org/slf4j/slf4j-log4j12/1.6.6/slf4j-log4j12-1.6.6.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See
http://www.slf4j.org/codes.html#multiple_bindings for an
explanation.
SLF4J: Actual binding is
of type [org.slf4j.impl.Log4jLoggerFactory]
OnJ에오신것을
환영합니다.
onjHello2:::
사전충고
메소드실행전...
OnJ2에오신것을
환영합니다.
>>>>>>>> 에러발생
java.lang.Exception: OnJ Exception...
java.lang.Exception: OnJ
Exception...
at
onj.aop.programming.OnjWorldImpl.onjHello2(OnjWorldImpl.java:10)
at
onj.aop.programming.OnjWorldImpl$$FastClassByCGLIB$$4c0178cb.invoke(<generated>)
at
org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at
org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:698)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at
org.springframework.aop.framework.adapter.ThrowsAdviceInterceptor.invoke(ThrowsAdviceInterceptor.java:124)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at
onj.aop.programming.AroundLoggingAdvice.invoke(AroundLoggingAdvice.java:9)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at
org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.invoke(AfterReturningAdviceInterceptor.java:51)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at
org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:51)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at
org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:631)
at
onj.aop.programming.OnjWorldImpl$$EnhancerByCGLIB$$cb4b3dbf.onjHello2(<generated>)
at
onj.aop.programming.OnjClient.main(OnjClient.java:35)
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