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Overview of AspectJ style AOP

Please refer to spring-framework under org.springframework.mylearntest package for code related to this article (from official source spring-test module).

No need to implement corresponding interfaces like in 1.0, the only thing to do is to add an @Aspect annotation on this Aspect class. This way we can determine which classes in ClassPath are Aspect definitions we are looking for. Define Pointcut via @Pointcut, specify which methods define corresponding Advice logic via annotations like Around.

PerformanceTraceAspect
package org.springframework.mylearntest.aop2.aspectj;

import org.apache.commons.lang3.time.StopWatch;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;

/**
 * @Author: whalefall
 * @Date: 2020/7/28 22:46
 * After Spring 2.0 no need to implement interfaces to define pointcut
 */
@Aspect
public class PerformanceTraceAspect {
	private final Log logger = LogFactory.getLog(PerformanceTraceAspect.class);

	@Pointcut("execution(public  void *.method1()) || execution(public  void *.method2())")
	public void pointcutName() {}

	@Around("pointcutName()")
	public Object performanceTrace(ProceedingJoinPoint joinPoint) throws Throwable {
		StopWatch sw = new StopWatch();
		try {
			sw.start();
			return joinPoint.proceed();
		} finally {
				System.out.println("pt in method["
						+ joinPoint.getSignature().getName()
				+ "]>>>>>>" + sw.toString());
		}
	}
}
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