Java 匹配接口注解的Spring AOP切入点
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Spring AOP pointcut that matches annotation on interface
提问by Sean Patrick Floyd
I have a service class implemented in Java 6 / Spring 3 that needs an annotation to restrict access by role.
我有一个在 Java 6 / Spring 3 中实现的服务类，它需要一个注释来限制角色访问。
I have defined an annotation called RequiredPermission that has as its value attribute one or more values from an enum called OperationType:
我已经定义了一个名为 RequiredPermission 的注释，它的值属性来自一个名为 OperationType 的枚举：
public @interface RequiredPermission {
/**
* One or more {@link OperationType}s that map to the permissions required
* to execute this method.
*
* @return
*/
OperationType[] value();}
public enum OperationType {
TYPE1,
TYPE2;
}
package com.mycompany.myservice;
public interface MyService{
@RequiredPermission(OperationType.TYPE1)
void myMethod( MyParameterObject obj );
}
package com.mycompany.myserviceimpl;
public class MyServiceImpl implements MyService{
public myMethod( MyParameterObject obj ){
// do stuff here
}
}
I also have the following aspect definition:
我还有以下方面定义：
/**
* Security advice around methods that are annotated with
* {@link RequiredPermission}.
*
* @param pjp
* @param param
* @param requiredPermission
* @return
* @throws Throwable
*/
@Around(value = "execution(public *"
+ " com.mycompany.myserviceimpl.*(..))"
+ " && args(param)" + // parameter object
" && @annotation( requiredPermission )" // permission annotation
, argNames = "param,requiredPermission")
public Object processRequest(final ProceedingJoinPoint pjp,
final MyParameterObject param,
final RequiredPermission requiredPermission) throws Throwable {
if(userService.userHasRoles(param.getUsername(),requiredPermission.values()){
return pjp.proceed();
}else{
throw new SorryButYouAreNotAllowedToDoThatException(
param.getUsername(),requiredPermission.value());
}
}
The parameter object contains a user name and I want to look up the required role for the user before allowing access to the method.
参数对象包含一个用户名，我想在允许访问该方法之前查找用户所需的角色。
When I put the annotation on the method in MyServiceImpl, everything works just fine, the pointcut is matched and the aspect kicks in. However, I believe the annotation is part of the service contract and should be published with the interface in a separate API package. And obviously, I would not like to put the annotation on both service definition and implementation (DRY).
当我将注释放在 MyServiceImpl 中的方法上时，一切正常，切入点匹配并且切面启动。但是，我认为注释是服务合同的一部分，应该与接口一起发布在单独的 API 包中. 显然，我不想在服务定义和实现 (DRY) 上都添加注释。
I know there are cases in Spring AOP where aspects are triggered by annotations one interface methods (e.g. Transactional). Is there a special syntax here or is it just plain impossible out of the box.
我知道在 Spring AOP 中有些情况是由注释一个接口方法（例如事务）触发的。这里是否有特殊的语法，或者开箱即用是不可能的。
PS: I have not posted my spring config, as it seems to be working just fine. And no, those are neither my original class nor method names.
PS：我还没有发布我的 spring 配置，因为它似乎工作得很好。不，这些既不是我原来的类名也不是方法名。
PPS: Actually, here is the relevant part of my spring config:
PPS：实际上，这是我的 spring 配置的相关部分：
<aop:aspectj-autoproxy proxy-target-class="false" />
<bean class="com.mycompany.aspect.MyAspect">
<property name="userService" ref="userService" />
</bean>
采纳答案by Espen
If I understand you correct, you want a pointcut that finds all methods in classes that extends MyService and is annotated and with the preferred arguments.
如果我理解正确，您需要一个切入点，该切入点可以找到扩展 MyService 的类中的所有方法，并带有注释和首选参数。
I propose that you replace:
我建议你更换：
execution(public * com.mycompany.myserviceimpl.*(..))
with:
和：
execution(public * com.mycompany.myservice.MyService+.*(..))
The plus sign is used if you want a joinpoint to match the MyService class or a class that extends it.
如果您希望连接点与 MyService 类或扩展它的类相匹配，则使用加号。
I hope it helps!
我希望它有帮助！
回答by pkmk
Espen, your code works only for one class:
Espen，您的代码仅适用于一类：
execution(public * com.mycompany.myservice.MyService+.*(..))
but what if I want this behaviour for all services in *com.mycompany.services.** package?
但是，如果我希望 *com.mycompany.services.** 包中的所有服务都有这种行为怎么办？
