使用AspectJ Annotation获取方法输入的属性(Get Method Input's Attributes using AspectJ Annotation)

 我正在尝试获取方法输入的一些属性，但我只能获得方法的输入，而无需任何选项来访问属性或使用任何get方法。 
 
 例如，这是我的代码 
 
@Around("execution (* *(cloudFile))")
public Object captureFileAttribute(ProceedingJoinPoint joinPoint) throws Throwable {
        Object result = joinPoint.proceed();
        System.err.println(joinPoint.getArgs()[0]);
        return result;
    }
 
 其中cloudFile基本上是一个包含很多东西的类，包括一个文件，并且可以通过使用cloudFile.getSize（）来获取文件的大小; （得到方法）。 基本上，cloudFile类看起来像这样： 
 
public class CloudFile implements Comparable<CloudFile> {
...

public CloudFile(CloudFolder folder, File file, FileSyncStatus syncStatus, TrustLevel trustLevel, String checksum) {
...
}
...
public long getSize() {
        return size.get();
    }
...
}
 
 从上面的代码我只能打印文件的名称，如a.txt但没有选项访问文件中包含的属性（在这种情况下，我希望得到5 KB的大小）。 有没有办法从AspectJ传递的参数中访问变量或方法？ 有没有选择呢？ 
 
 谢谢 
 
 UPDATE 
 
 我发现类似的东西在正常的AspectJ中回答我的问题是这样的： 
 
public privileged aspect MemberAccessRecipe 
{
   /*
   Specifies calling advice whenever a method
   matching the following rules gets executed:

   Class Name: MyClass
   Method Name: foo
   Method Return Type: void
   Method Parameters: an int followed by a String
   */
   pointcut executionOfFooPointCut( ) : execution(
      void MyClass.foo(int, String));

   // Advice declaration
   after(MyClass myClass) : executionOfFooPointCut( ) && this(myClass)
   {
      System.out.println(
         "------------------- Aspect Advice Logic --------------------");
      System.out.println(
         "Accessing the set(float) member of the MyClass object");
      System.out.println(
         "Privileged access not required for this method call as it is 
         public");
      myClass.setF(2.0f);
      System.out.println(
         "Using the privileged aspect access to the private f member 
         variable");
      System.out.print("The current value of f is: ");
      System.out.println(myClass.f);
      System.out.println(
         "Signature: " + thisJoinPoint.getSignature( ));
      System.out.println(
         "Source Line: " + thisJoinPoint.getSourceLocation( ));
      System.out.println(
         "------------------------------------------------------------");
   }
}
 
 现在我很困惑，并试图在AspectJ注释中找到相同的写作。 

I'm trying to get some attributes of method's input but I'm only able to get the method's input only without any option to access the attributes or use any get method.
 
For example here is my code
 
@Around("execution (* *(cloudFile))")
public Object captureFileAttribute(ProceedingJoinPoint joinPoint) throws Throwable {
        Object result = joinPoint.proceed();
        System.err.println(joinPoint.getArgs()[0]);
        return result;
    }
 
where cloudFile is basically a class that contains a lot of stuff, including a file and it's possible to get the size of the file by using cloudFile.getSize(); (get method). Basically the cloudFile class looks like this:
 
public class CloudFile implements Comparable<CloudFile> {
...

public CloudFile(CloudFolder folder, File file, FileSyncStatus syncStatus, TrustLevel trustLevel, String checksum) {
...
}
...
public long getSize() {
        return size.get();
    }
...
}
 
From the above code I'm only able to print the name of file, like a.txt but without option of accessing the attributes contained in the file (in this case I would like to get the size of 5 KB). Is there a way to access the variables or methods from the arguments passed on by the AspectJ? Is there any option to do that?
 
Thanks
 
UPDATE
 
I have found something similar to answer my question in normal AspectJ something like this:
 
public privileged aspect MemberAccessRecipe 
{
   /*
   Specifies calling advice whenever a method
   matching the following rules gets executed:

   Class Name: MyClass
   Method Name: foo
   Method Return Type: void
   Method Parameters: an int followed by a String
   */
   pointcut executionOfFooPointCut( ) : execution(
      void MyClass.foo(int, String));

   // Advice declaration
   after(MyClass myClass) : executionOfFooPointCut( ) && this(myClass)
   {
      System.out.println(
         "------------------- Aspect Advice Logic --------------------");
      System.out.println(
         "Accessing the set(float) member of the MyClass object");
      System.out.println(
         "Privileged access not required for this method call as it is 
         public");
      myClass.setF(2.0f);
      System.out.println(
         "Using the privileged aspect access to the private f member 
         variable");
      System.out.print("The current value of f is: ");
      System.out.println(myClass.f);
      System.out.println(
         "Signature: " + thisJoinPoint.getSignature( ));
      System.out.println(
         "Source Line: " + thisJoinPoint.getSourceLocation( ));
      System.out.println(
         "------------------------------------------------------------");
   }
}
 
and now I am confused and trying to find the equal writing in AspectJ annotation.

原文：https://stackoverflow.com/questions/37075638