[aspectj-users] Re: "Help with hasmethod() and hasfield() pointcuts"

["Henrique Mostaert" <henrique.mr@xxxxxxxxx>]

Dear Andy Clement,

 Thanks for the help!! 

 Moreover, Is there a way to use the hasmethod pointcut in another context besides declare parents?? 

 I want it in a situation to verify for example If a Class C has the method x() then inserts a method t() using the inter-type declarations...

 Is possible?

On Dec 19, 2007 3:00 PM, <aspectj-users-request@xxxxxxxxxxx> wrote:

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Today's Topics:

  1. "Help with hasmethod() and hasfield() pointcuts"
     (Henrique Mostaert)
  2. Re: "Help with hasmethod() and hasfield() pointcuts"
     (Andy Clement)
  3. Serialization aspect problem (neil loughran)


----------------------------------------------------------------------

Message: 1
Date: Wed, 19 Dec 2007 10:45:14 -0200
From: "Henrique Mostaert" <henrique.mr@xxxxxxxxx>
Subject: [aspectj-users] "Help with hasmethod() and hasfield()
       pointcuts"
To: aspectj-users < aspectj-users@xxxxxxxxxxx>
Message-ID:
       <673df86b0712190445n28c4cc0es87f5227d97741aa9@xxxxxxxxxxxxxx >
Content-Type: text/plain; charset="iso-8859-1"

Hello all,

 Could someone give me some instructions in order to use hasmethod() and
hasfield() pointcuts?

 I activated the option in AJDT 1.4 with AspectJ 5 to "allow hasmethod()
and hasfield() type patterns in declare parents and declare @type".  But, it
doesn't work. The AJDT plugin doesn't recognize these pointcuts leading to
compile time error. So, Could someone explain me why this happens?

 Moreover, If someone could also show me how to allow these pointcuts
Through ajc compiler options. (I didn't find the this option, only through
eclipse and it does not work ).

Regards!

--
Henrique Mostaert
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Message: 2
Date: Wed, 19 Dec 2007 14:49:48 +0000
From: "Andy Clement" < andrew.clement@xxxxxxxxx>
Subject: Re: [aspectj-users] "Help with hasmethod() and hasfield()
       pointcuts"
To: aspectj-users@xxxxxxxxxxx
Message-ID:
       <689d61aa0712190649o21a9ed7ds529ff0e4f1e2c3ff@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset=ISO-8859-1

Hi, here you go:

--- A.java ----- 8< -----
public class A {
 public static void main(String[]argv) {
 }
}

aspect X {
 declare parents: hasmethod(public void main(..)) implements
java.io.Serializable;
}
-----8<------
$ ajc -1.5 -showWeaveInfo -XhasMember A.java
Extending interface set for type 'A' (A.java) to include
'java.io.Serializable' (A.java)

$ javap A
Compiled from "A.java"
public class A extends java.lang.Object implements java.io.Serializable{
   public A();
   public static void main(java.lang.String[]);
}

I'm not sure why flicking the option on in AJDT is not working for you.

Andy.

On 19/12/2007, Henrique Mostaert <henrique.mr@xxxxxxxxx> wrote:
> Hello all,
>
>   Could someone give me some instructions in order to use hasmethod() and
> hasfield() pointcuts?
>
>   I activated the option in AJDT 1.4 with AspectJ 5 to "allow hasmethod()
> and hasfield() type patterns in declare parents and declare @type".  But, it
> doesn't work. The AJDT plugin doesn't recognize these pointcuts leading to
> compile time error. So, Could someone explain me why this happens?
>
>  Moreover, If someone could also show me how to allow these pointcuts
> Through ajc compiler options. (I didn't find the this option, only through
> eclipse and it does not work ).
>
> Regards!
>
> --
> Henrique Mostaert
>
>
> _______________________________________________
> aspectj-users mailing list
> aspectj-users@xxxxxxxxxxx
> https://dev.eclipse.org/mailman/listinfo/aspectj-users
>
>


------------------------------

Message: 3
Date: Wed, 19 Dec 2007 15:59:22 -0000
From: "neil loughran" <loughran@xxxxxxxxxxxxxxxx >
Subject: [aspectj-users] Serialization aspect problem
To: <aspectj-users@xxxxxxxxxxx>
Message-ID: <004b01c84258$1f499390$1a28220a@STUDENT6510>
Content-Type: text/plain;       charset="us-ascii"

Hi all

I'm trying to figure out what exactly is wrong with my pointcut/advice for a
serialisation aspect.

The code below is fairly simple but captures the problem I have.  Basically
I create an object of type Foo and set Foo.x to Foobar. My aspect has two
advice.. one for capturing instantiation of Foo and the other for capturing
setX on Foo objects.

On instantiation of Foo, I attempt to load a serialised file ( Foo.ser).  If
it doesn't exist then an exception is thrown but the program carries on as
usual.  When I setX the second advice serializes the Foo object as file
Foo.ser.

Therefore when I run the program a second time I expect the Foo.ser file to
load and the contents loaded to the Foo object.  However, for some reason I
can't seem to show the loaded value in FooDriver only in the aspect.
Therefore, I am assuming my first advice is incorrectly written and the
loaded content is lost outside of the aspect.  I have tried a few different
varieties of around/after returning advice to no avail.

Can anyone spot the mistake in the first advice... it's driving me nuts!

Many thanks
Neil Loughran



import java.io.*;

class FooDriver  {
   public static void main(String args[])  {
       Foo f = new Foo();
       System.out.println("[FooDriver] x = "+f.getX()); // always null!!?

       f.setX("Foobar");
   }
}

class Foo  {
   public String x;
   public void setX(String _x)  {
       x = _x;
   }

   public String getX() {
               return x;
       }
}

aspect MyAspect  {
   declare parents: Foo implements Serializable;
   String filename = "Foo.ser";

   // problematic advice?
   after(Foo f): this(f) && execution ( Foo.new())  {
       try  {
           f = (Foo) SerializeObject.load(filename);
           System.out.println("[MyAspect] x = "+f.getX()); // works fine
here!
       }

       catch(Exception e)  {
           System.out.println("File not found "+ e);
       }
   }

   after(Foo f): this(f) && execution(public void Foo.setX(String))  {
       System.out.println("Setting");
       try  {
           SerializeObject.save(f,filename);
       }

       catch(IOException e)  {
           System.out.println("File not found "+ e);
       }
   }
}

class SerializeObject  {
   public static void save(Object obj, String filename) throws IOException
{
         System.out.println("Saving file: "+filename);
       ObjectOutputStream objstream = new ObjectOutputStream(new
FileOutputStream(filename));
       objstream.writeObject(obj);
       objstream.close();
   }

   public static Object load(String filename) throws Exception  {
       System.out.println("Loading file: "+filename);
       ObjectInputStream objstream = new ObjectInputStream(new
FileInputStream(filename));
       Object obj = objstream.readObject();
       objstream.close();
       return obj;
   }
}



------------------------------

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End of aspectj-users Digest, Vol 34, Issue 37
*********************************************

-- 
Henrique Mostaert, Departamento de Sistemas Computacionais, UPE 
http://www.dsc.upe.br/~hemr