Sometimes it happens that we may need same pointcut at multiple places. But since pointcut expressions are lengthy, it will be good if instead of repeating we can give a logical name to that pointcut and refer to it by logical name.
So for this we have to first create pointcut config :
package com.xxxx;
//
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
@Aspect
public class PointcutConfig {
@Pointcut("execution(public * service.*.*(..))") //This is a pointcut expression
public void serviceComponents() {} //This is a name given to the pointcut expression
@Pointcut("execution(* apply*(..))")
public void applyMethods() {}
}
Note that we @Aspect and @Pointcut annotations above.
When we write our own aspect we can simply refer to these method names in pointcut-config now:
import java.util.Date;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
@Aspect
public class LoggingAspect {
@Before("com.xxxx.PointcutConfig.applyMethods()")
public void log(JoinPoint joinPoint) {
System.out.println("log advice executed for method : "+joinPoint.getSignature().getName());
}
@Before("com.xxxx.PointcutConfig.serviceComponents()")
public void timeLog(JoinPoint joinPoint) {
System.out.println("request for method : "+joinPoint.getSignature().getName()+" occurred at "+new Date());
}
}
In the config file, we have to define both beans:
<aop:aspectj-autoproxy />
<bean id="pointcutConfig" class="ex4.PointcutConfig" />
<bean id="loggingAspect" class="ex4.LoggingAspect" />
<bean class="service.OrderServiceImpl" />
<bean class="service.CustomerServiceImpl" />
