该接口用来获取事务相关的配置
其实底层就是通过TransactionAnnotationParser接口来实现的,如果了解TransactionAnnotationParser,此接口特别简单
方法:getTransactionAttribute
@Nullable
TransactionAttribute getTransactionAttribute(Method method, @Nullable Class<?> targetClass);
使用该接口非常重要的实现类AnnotationTransactionAttributeSource来演示该接口
import java.lang.reflect.Method;
import org.springframework.transaction.annotation.AnnotationTransactionAttributeSource;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.transaction.interceptor.TransactionAttribute;
import org.springframework.transaction.interceptor.TransactionAttributeSource;
@Transactional(isolation = Isolation.READ_UNCOMMITTED)
public class TransactionAttributeSourceTestMain {
public void m1() {
}
public static void main(String[] args) throws Exception {
Method m1 = TransactionAttributeSourceTestMain.class.getMethod("m1");
TransactionAttributeSource tas = new AnnotationTransactionAttributeSource();
TransactionAttribute ta = tas.getTransactionAttribute(m1, TransactionAttributeSourceTestMain.class);
System.out.println(ta);
}
}
日记:其中有一个实现类,是CompositeTransactionAttributeSource,组合模式,spring常用模式,比如A implements M接口,B implements M接口,C也implements M接口,但是最后C中会将A与B都添加到自己类的一个属性中,然后在自己的实现方法中轮询调用A和B的实现方法