Re: [aspectj-users] how to capture a newly initialized object in a call

[Matthew Webster <matthew_webster@xxxxxxxxxx>]

Henry,

Try

    after (OntoModelChangeEventSource
listener) returning(OntoModelChangeEventSource
source) : 
        newEventSource(listener)
    {
        source.addModelChangeListener(new
ChangeListener (listener));
    }

Matthew Webster
AOSD Project
Java Technology Centre, MP146
IBM Hursley Park, Winchester,  SO21 2JN, England
Telephone: +44 196 2816139 (external) 246139 (internal) 
Email: Matthew Webster/UK/IBM @ IBMGB, matthew_webster@xxxxxxxxxx
http://w3.hursley.ibm.com/~websterm/

"Henry Canterburry" <canterburry@xxxxxxxxx>
Sent by: aspectj-users-bounces@xxxxxxxxxxx

20/09/2006 14:37

Please respond to
aspectj-users@xxxxxxxxxxx

To	aspectj-users@xxxxxxxxxxx
cc
Subject	[aspectj-users] how to capture a newly initialized object in a call        pointcut?

I am pretty new at this aspect stuff and have been reading
one of the Eclipse AspectJ Books. One of the passages concerning initializer
pointcuts states:

"When the method signature of a call _expression_
specifies a constructor, this
will provide the instance (if the call is being made from a nonstatic context)
of the object making the constructor call. target
is always unbound—this means attempts to use it to match on a type or
expose the target of the call will leave you with a pointcut that does
not match the constructor call."

So, is it then at all possible to write a pointcut that both captures the
instance of the calling object and the instance of the object just created?

i.e 

What I really want to write is this: 

    pointcut
newEventSource(ModelChangeEventSource
source, ModelChangeEventSource
listener) :
        call(ModelChangeEventSource+.new(..))
&&
        this(listener+) && 
        target(source+) &&
        within(*.core.model.*);
        
    after (OntoModelChangeEventSource
source, OntoModelChangeEventSource
listener) returning : 
        newEventSource(source,
listener)
    {
        source.addModelChangeListener(new
ChangeListener (listener));
    }

This basically says (or at least should say) if any event source instantiates
any new event source, then add the first source as a listener to the newly
created source. 

This is for purposes of event propagation between event sources inside
a domain model.

Thanks
-HC_______________________________________________
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