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
}
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