本文介绍了Spring AOP和AspectJ加载时编织:围绕建议将为私有方法调用两次的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我将使用Spring AOP和AspectJ Load-Time Weaving来测量代码中特定私有/受保护/公共方法的执行时间.
I will use Spring AOP and AspectJ Load-Time Weaving to measure execution time of specific private/protected/public methods in my code.
为此，我用以下注释编写了一个注释，我将注释应该测量执行时间的方法:
To do this I wrote following annotation with one I will annotate the methods which execution time should be measured:
package at.scan.spring.aop.measuring;
import org.aspectj.lang.ProceedingJoinPoint;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* Annotation for pointcut associated with the advice {@link MeasuringAspect#aroundAdvice(ProceedingJoinPoint)}.
* @author ilyesve
* @since 02.12.2015
*/
@Target(value = ElementType.METHOD)
@Retention(value = RetentionPolicy.RUNTIME)
public @interface Measured {
}
我还写了以下方面:
package at.scan.spring.aop.measuring;
import org.apache.commons.lang3.builder.ReflectionToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* An aspect which contains an advice to measure execution of methods that are annotated with {@link Measured} if it
* is enabled.
* After the execution of the annotated method the captured data over its execution will be forwarded to the
* configured {@link MeasuringReporter}.
* @author ilyesve
* @since 02.12.2015
*/
@Aspect
public class MeasuringAspect {
/** LOGGER. */
private static final Logger LOGGER = LoggerFactory.getLogger(MeasuringAspect.class.getPackage().getName());
/** Determines whether the Around advice is enabled. Default is disabled. */
private boolean enabled = false;
/** The {@link MeasuringReporter} to report the captured measuring data. */
private MeasuringReporter reporter;
/**
* The Around advice which will be executed on calling of methods annotated with {@link Measured}.
* @param pjp the join point
* @throws Throwable on failure
* @return result of proceeding of the join point
*/
@Around("@annotation(Measured)")
public Object aroundAdvice(ProceedingJoinPoint pjp) throws Throwable {
Object result = null;
if (enabled && reporter != null) {
LOGGER.debug("Starting measuring of method '{}.{}()'...",
pjp.getSignature().getDeclaringTypeName(),
pjp.getSignature().getName());
MeasuringDataDto measuringData = new MeasuringDataDto(pjp.getSignature(), pjp.getArgs());
measuringData.setStartTs(System.currentTimeMillis());
try {
measuringData.setResult(pjp.proceed());
} catch (Throwable t) {
measuringData.setThrowable(t);
}
measuringData.setEndTs(System.currentTimeMillis());
try {
reporter.report(measuringData);
} catch (Throwable t) {
LOGGER.error("Unable to report captured measuring data because of an error. MeasuringData [{}]",
ReflectionToStringBuilder.toString(measuringData, ToStringStyle.DEFAULT_STYLE, true, true),
t);
}
if (measuringData.getThrowable() != null) {
throw measuringData.getThrowable();
}
result = measuringData.getResult();
} else {
result = pjp.proceed();
}
return result;
}
/**
* @param theEnabled if {@code true} the contained advice will be enabled, otherwise disabled
*/
public final void setEnabled(final boolean theEnabled) {
enabled = theEnabled;
if (enabled && reporter != null) {
LOGGER.info("Methods will be measured. Reporter [{}]", reporter.getClass().getCanonicalName());
}
}
/**
* @param theReporter the {@link MeasuringReporter} to be used to report the captured measuring data about
* execution of an method annotated with {@link Measured}
*/
public final void setReporter(final MeasuringReporter theReporter) {
reporter = theReporter;
if (enabled && reporter != null) {
LOGGER.info("Methods will be measured. Reporter [{}]", reporter.getClass().getCanonicalName());
}
}
}
我的Spring配置如下:
My Spring configuration is as follows:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd"
default-autowire="byName">
<context:load-time-weaver aspectj-weaving="autodetect" />
<bean id="measuringAspect" class="at.scan.spring.aop.measuring.MeasuringAspect"
factory-method="aspectOf">
<property name="enabled" value="${measuring.enabled}" />
<property name="reporter" ref="measuringReporterService" />
</bean>
</beans>
我还将以下aop.xml放在项目的目录src/main/resources/META-INF中:
I have also placed in the directory src/main/resources/META-INF of my project the following aop.xml:
<!DOCTYPE aspectj PUBLIC "-//AspectJ//DTD//EN" "http://www.eclipse.org/aspectj/dtd/aspectj.dtd">
<aspectj>
<weaver>
<include within="at.scan..*" />
</weaver>
<aspects>
<aspect name="at.scan.spring.aop.measuring.MeasuringAspect" />
</aspects>
</aspectj>
我还将以下Spring AOP和/或AspectJ特定的依赖项添加到了我的POM中:
Also I added following Spring AOP and/or AspectJ specific dependencies to my POM:
- org.aspectj:aspectjrt:1.8.6
- org.aspectj:aspectjtools:1.8.6
- org.springframework:spring-aop:4.1.6
此外，通过启动Tomcat，我将org.aspectj:aspectweaver:1.8.6用作Java代理.
Furthermore I use org.aspectj:aspectweaver:1.8.6 as Java Agent by starting of my Tomcat.
一切都适用于带注释的公共方法和受保护的方法，但对于带注释的私有方法，我方面的周围建议将被调用两次，而我不知道为什么.
Everything works fine for annotated public and protected methods but for annotated private methods the around advice of my aspect will by invoked twice and I don't know why.
推荐答案
@Around("execution(* *(..)) && @annotation(Measured)")
public Object aroundAdvice(ProceedingJoinPoint pjp) throws Throwable {
...
}
添加执行(* *(..))
Adding execution(* *(..))
这篇关于Spring AOP和AspectJ加载时编织:围绕建议将为私有方法调用两次的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！