[aspectj-users] LTW, inter-type fields and pertarget() aspects

[Jochen Wuttke <jochen.wuttke@xxxxxx>]

Hi,

I started playing with LTW, inter-type fields and pertarget() aspects  
and ran into an interesting problem.
I was trying to use inter-type fields to carry some information I need  
on a per-object basis. But every time the advice using these inter- 
type fields got executed I got a NoSuchFieldException (the compiler  
gave me a typeNotExposedToWeaver warning, but I think that's ok,  
because I use LTW). So I changed my aspect to be pertarget() and it  
behaves like expected (aspect code below).

Now here are my questions:
- Shouldn't a pertarget/perthis aspect declare field pretty much the  
same way as an inter-type declaration in a singleton aspect?
- I'm not sure if I should use a pertarget or perthis aspect for what  
I want to do. The content of the fields should be carried around with  
the advised object across the objects lifetime (which is why I  
originally wanted to use inter-types).
- When running the LTW with -showWeaveInfo I get a log message for  
every jointpoint that gets woven. What should the message look like  
for weaving inter-type fields. Or should there be a message at all?

Thanks,
Jochen

P.S.: My aspect looks like this:

public aspect JspIdConsumerUnique  
pertarget( instanceCreation(UIComponentClassicTagBase) ||  
setUniqueProperty(UIComponentClassicTagBase) ) {
	
	private boolean lumi_uniquePropertySet = false;
	private Object lumi_uniqueProperty = null;

	pointcut instanceCreation( UIComponentClassicTagBase _consumer ):  
target(_consumer) && execution( UIComponentClassicTagBase+.new(..) );
		
	after(UIComponentClassicTagBase _consumer) :  
instanceCreation( _consumer ) {
		safeAddObject( _consumer );
	}
	
	pointcut setUniqueProperty( UIComponentClassicTagBase _consumer ):  
target(_consumer) &&
		call( * UIComponentClassicTagBase+.setJspId(..) );
	
	before( UIComponentClassicTagBase _consumer ):  
setUniqueProperty( _consumer ) {
		uniqueProperty = _consumer.getJspId();
	}
	
	after( UIComponentClassicTagBase _consumer ):  
setUniqueProperty( _consumer ) {
		if ( propertyHasChanged( _consumer.getJspId() ) ) {
			lumi_uniquePropertySet = true;
			updateContainer( uniqueProperty, _consumer );
		}
	}
	
	//private methods go here

}