@EnableLoadTimeWeaving Spring example
August 15, 2013
@EnableLoadTimeWeaving enables LoadTimeWeaver for the application context. @EnableLoadTimeWeaving is applied on class label where beans have been defined. It is used as
@EnableLoadTimeWeaving(aspectjWeaving=AspectJWeaving.ENABLED)
public class AspectConfig {}
@EnableLoadTimeWeaving(aspectjWeaving=AspectJWeaving.AUTODETECT)
public class AspectConfig {}
@EnableLoadTimeWeaving(aspectjWeaving=AspectJWeaving.DISABLED)
public class AspectConfig {}
AspectConfig.java
package com.concretepage;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
import org.springframework.context.annotation.EnableLoadTimeWeaving;
import org.springframework.context.annotation.EnableLoadTimeWeaving.AspectJWeaving;
import com.concretepage.bean.UserService;
@Configuration
@EnableAspectJAutoProxy
@EnableLoadTimeWeaving(aspectjWeaving=AspectJWeaving.ENABLED)
public class AspectConfig {
@Bean
public UserService userService(){
return new UserService();
}
@Bean
public UserAspect userAspect(){
return new UserAspect();
}
}
UserAspect.java
package com.concretepage;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.util.StopWatch;
@Aspect
public class UserAspect {
@Around("execution(* com.concretepage.bean.UserService.doTask(..))")
public void userAdvice(ProceedingJoinPoint joinPoint) throws Throwable{
StopWatch stwatch = new StopWatch(getClass().getSimpleName());
try{
stwatch.start(joinPoint.getSignature().getName());
joinPoint.proceed();
}finally{
stwatch.stop();
System.out.println(stwatch.prettyPrint());
}
}
}
package com.concretepage.bean;
public class UserService {
public void doTask() {
System.out.println("do some task.");
}
}
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>3.1.0.RELEASE</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>aopalliance</groupId>
<artifactId>aopalliance</artifactId>
<version>1.0</version>
<optional>true</optional>
</dependency>
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib-nodep</artifactId>
<version>2.1_3</version>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-annotations</artifactId>
<version>3.5.2-Final</version>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>3.6.0.Final</version>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>2.0.8</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>3.1.0.RELEASE</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp-all</artifactId>
<version>1.3</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>3.1.0.RELEASE</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>3.1.0.RELEASE</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>3.1.0.RELEASE</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>3.1.0.RELEASE</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-asm</artifactId>
<version>3.1.0.RELEASE</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.17</version>
</dependency>
<dependency>
<groupId>javax.inject</groupId>
<artifactId>javax.inject</artifactId>
<version>1</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-agent</artifactId>
<version>2.5.6</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.5.4</version>
</dependency>
</dependencies>
package com.concretepage;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import com.concretepage.bean.UserService;
public class SpringAOPTest {
public static void main(String[] args) {
AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
ctx.register(AspectConfig.class);
ctx.refresh();
UserService userService = ctx.getBean(UserService.class);
userService.doTask();
}
}
do some task. StopWatch 'UserAspect': running time (millis) = 0 ----------------------------------------- ms % Task name ----------------------------------------- 00000 ? doTask
XML based LoadTimeWeaver
Whatever the@EnableLoadTimeWeaving does, it can be achieved in XML as below.
SpringAOPTest.java
<beans>
<context:load-time-weaver/>
</beans>
enableloadtimeweaving-spring-example.zip
