Spring AOP と AspectJ Load-Time Weaving を使用して、コード内の特定のプライベート/保護/パブリック メソッドの実行時間を測定します。
これを行うために、実行時間を測定する必要があるメソッドに注釈を付ける次の注釈を書きました。
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 {
}
次のアスペクトも書きました。
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());
}
}
}
私のSpring構成は次のとおりです。
<?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>
src/main/resources/META-INFまた、プロジェクトのディレクトリに次のものを配置しました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>
また、次の Spring AOP および/または AspectJ 固有の依存関係を POM に追加しました。
- org.aspectj:aspectjrt:1.8.6
- org.aspectj:aspectjtools:1.8.6
- org.springframework:spring-aop:4.1.6
さらにorg.aspectj:aspectweaver:1.8.6、Tomcat を起動して Java エージェントとして使用しています。
注釈付きのパブリック メソッドと保護されたメソッドではすべてが正常に機能しますが、注釈付きのプライベート メソッドの場合、私の側面のアドバイスは 2 回呼び出され、その理由はわかりません。