CODEWITHSUNDEEP
javaspring-aopcompile-time-constantpointcut
wutingjia
wutingjia

Reputation: 23

How to use a external value in @Pointcut

I am writing a common component for team members.So I write an aspect with Spring-aop.Ideally,what others only need to do is defining an point-cut expression in .properties or others.But I find it is a bit difficult。

I have searched some information in stackoverflow,but i'm confused。

1、the value of @Pointcut:Attribute value must be constant,does this mean the value must be compile-time constant and can't use ${}? If it does,why？ the Spring aop is based on LTW why the pointcut expression must be constant？

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD})
public @interface Pointcut {
    String value() default "";

    String argNames() default "";
}

2、Can I read an external constant as the compile-time constant may like follow？ 

private static final String a;

static{
    String b = "xx";// read external file
    a = b;
}

@Pointcut(a) //not work
public void pointcut(){}

3、We use entire Annotation way without xml,So I can't let others define an another aop.xml,though I know it will work.

4、I have found a indirect way is 

public abstract void pointcut();

and others to implement this abstract way,but not very elegant。

4、Should I implement it in a runtime-way? （But I have no idea）

5、Any suggestion will help me a lot！

Upvotes: 0

Views: 321

Answers (0)

Related Questions