在我的项目中,我目前使用 AspectJ(由于某些限制而不仅仅是 Spring AOP)在编译时进行编织。为了加快 Eclipse 上的开发,我想在 Load Time 进行编织。我成功地做到了这一点,但有一个主要限制:为我的服务使用包含一些事务方法的接口。如果我用它的实现而不是它的接口声明服务,在调用者类中,没有编织,因此不支持事务。
那么如果 AspectJ 支持它,如何配置 AspectJ with Load Time Weaving without Interface ?
我创建了一个重现该问题的小项目:
以下测试失败。
以下测试成功,如果:
注入的服务是用它的接口而不是它的实现来声明的(即用“@Inject MyService 服务”替换“@Inject MyServiceImpl 服务”),测试成功。
编织是在编译期间执行的(在这种情况下,配置、POM 和 Spring 应用程序上下文显然不同)。但我的目标是在加载时进行编织以避免每次保存 Java 文件时的编织阶段。
使用 Spring AOP (tx:annotation-driven mode="proxy"),即基于代理的解决方案,代替 AspectJ。但是在这种情况下,我们遇到了自调用问题,即目标对象中的某个方法调用目标对象的其他方法,即使调用的方法带有@Transactional 标记,在运行时也不会导致实际事务。
aspectj-ltw/src/test/java/mycompany/aspectj_ltw/MyServiceImplTest.java
package mycompany.aspectj_ltw;
import static junit.framework.Assert.assertTrue;
import javax.inject.Inject;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "classpath:/META-INF/spring/applicationContext.xml" })
public class MyServiceImplTest {
@Inject
MyServiceImpl service;
@Test
public void shouldBeExecutedInTransaction() {
assertTrue(this.service.isExecutedInTransaction());
}
}
aspectj-ltw/src/main/java/mycompany/aspectj_ltw/MyService.java
package mycompany.aspectj_ltw;
public interface MyService {
boolean isExecutedInTransaction();
}
aspectj-ltw/src/main/java/mycompany/aspectj_ltw/MyServiceImpl.java
package mycompany.aspectj_ltw;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.transaction.support.TransactionSynchronizationManager;
@Service
public class MyServiceImpl implements MyService {
@Transactional
public boolean isExecutedInTransaction() {
return TransactionSynchronizationManager.isActualTransactionActive();
}
}
aspectj-ltw/src/test/resources/META-INF/applicationContext.xml
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
<context:component-scan base-package="mycompany.aspectj_ltw" />
<context:load-time-weaver aspectj-weaving="on" />
<aop:config proxy-target-class="true"/>
<aop:aspectj-autoproxy proxy-target-class="true"/>
<tx:annotation-driven mode="aspectj"
transaction-manager="transactionManager" proxy-target-class="true" />
<bean class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close" id="dataSource">
<property name="driverClassName" value="org.h2.Driver" />
<property name="url" value="jdbc:h2:mem:mydb" />
<property name="username" value="sa" />
<property name="password" value="" />
</bean>
<bean class="org.springframework.jdbc.datasource.DataSourceTransactionManager"
id="transactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
aspectj-ltw/src/test/resources/META-INF/aop.xml
<!DOCTYPE aspectj PUBLIC
"-//AspectJ//DTD//EN" "http://www.eclipse.org/aspectj/dtd/aspectj.dtd">
<aspectj>
<weaver options="-showWeaveInfo -debug -verbose -XmessageHandlerClass:org.springframework.aop.aspectj.AspectJWeaverMessageHandler">
<include within="mycompany.aspectj_ltw..*"/>
</weaver>
</aspectj>
aspectj-ltw\pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>mycompany</groupId>
<artifactId>aspectj-ltw</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>aspectj-ltw</name>
<properties>
<spring.version>3.0.5.RELEASE</spring.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>1.7.0</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.7.0</version>
</dependency>
<dependency>
<groupId>javax.inject</groupId>
<artifactId>javax.inject</artifactId>
<version>1</version>
</dependency>
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib-nodep</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.2.143</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>0.9.24</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>0.9.24</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>log4j-over-slf4j</artifactId>
<version>1.6.1</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<forkMode>always</forkMode>
<argLine>
-javaagent:C:/maven-2_local_repo/org/springframework/spring-instrument/3.0.5.RELEASE/spring-instrument-3.0.5.RELEASE.jar
</argLine>
</configuration>
</plugin>
</plugins>
</build>
</project>
运行测试的 VM 参数:
-javaagent:C:/maven-2_local_repo/org/springframework/spring-instrument/3.0.5.RELEASE/spring-instrument-3.0.5.RELEASE.jar