> From: Noel J. Bergman [mailto:[EMAIL PROTECTED]
>
> Leo,
>
> I figure that you should go for it.
>
> I'd like to hear more about your plans. JSR 175 is the
> normative statement of what attributes must be in Java. How
> do your plans compare and contrast with JSR 175, nanning,
> Aspect4J, etc?
The major differences (that I'm aware of) are:
+ I store attributes in generated classes. The classes are
generated at compile-time by the attribute compiler as
source files.
+ Attributes are object instances of any class (not just
serializable). Last I checked, nanning attributes only
allowed string valued attributes. Attrib4J used .class
file manipulation, but was moving away from that.
+ I'm sure I'm missing out on something here...
I wish I had a copy of JSR175 - are you aware of any place
I can get it? I've been searching for it in order to make
my implementation sort-of conformant.
An explanation of how my impl works is at:
http://marc.theaimsgroup.com/?l=avalon-dev&m=105974933614920&w=2:
(...)
With the risk that this turns into a "Leo's Picks" column I am also
beginning to like the way attributes are handled in .Net, with value
objects. You'd have:
import org.apache.avalon.framework.attributes.ThreadSafe;
import org.apache.avalon.framework.attributes.Dependency;
/**
*
* @attribute new ThreadSafe()
* @attribute new Dependency( MyDependency.class, "my-dep" )
*/
public class MyComponent {
}
This could be compiled into a .java file and then into a .class
file:
public interface AttributeClass {
public Set getClassAttributes ();
}
import org.apache.avalon.framework.attributes.ThreadSafe;
import org.apache.avalon.framework.attributes.Dependency;
public class MyComponent$Attributes implements AttributeClass {
public static final Set classAttributes = new HashSet ();
static {
classAttributes.add ( new ThreadSafe () );
classAttributes.add ( Dependency( MyDependency.class,
"my-dep" ) );
}
public Set getClassAttributes () {
return classAttributes;
}
}
A standard API would be able to access this via:
Class c = MyComponent.class;
Class attributeClass = c.getClassLoader ().loadClass ( c.getName +
"$Attributes" );
AttributeClass instance = (AttributeClass)
attributeClass.newInstance ();
Set classAttributes = instance.getClassAttributes ();
and so on...
/LS
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