| RE: [aspectj-users] identifying a call within a method and harves t the parameter |
I think this is a case for the wormhole pattern (from Ramnivas' great book AspectJ in Action). I am guessing the reason what you have doesn't match is because you want the args(_param) to match the withincode, but it is being applied to the call(createValue) which has no args. AFAIK, you cannot pick up args using withincode.
(I haven't tried this, YMMV but I think it should be close to what you want.)
pointcut processingParam(Parameter _param):
execution (public Result Processor.process(_param));
pointcut creatingValueWhileProcessing:
call(public Value Processor.createValue()) &&
withincode(public Result Processor.process(Parameter));
pointcut wormhole(Parameter _param): cflow(processingParam(_param)) &&
creatingValueWhileProcessing();
Value around(Parameter _param): wormhole(Parameter) {
// advice code here
}
Check out Ramnivas' book www.manning.com/laddad for more on the wormhole pattern.
Elizabeth
-----Original Message-----
From: robert kuzelj [mailto:robert_kuzelj@xxxxxxxxx]
Sent: June 18, 2004 8:56 AM
To: aspectj-users@xxxxxxxxxxx
Subject: [aspectj-users] identifying a call within a method and harvest
the parameter
hi,
i want to weave something around a call to a
method where the result of the around advice is dependent
on a paramater value given to the calling method.
<code>
public class Processor
{
public Result process(Parameter _param)
{
...
Value val = createValue();
...
}
public Value createValue()
{
return null;
}
}
</code>
now i want to do something like this
<code>
public aspect ProcessCreation
{
pointcut creation(Parameter _param):
withincode(public Result Processor.process(Parameter))
&& args(_param)
&& call(public Value Processor.createValue());
Value around(Parameter _param): creation(_param)
{
Value result = null;
if (_param.getValue() == 0)
{
result = new Value("OK");
}
else
{
result = new Value("FAILED");
}
return result;
}
}
</code>
the problem is that as soon as i try to harvest the parameter
from the surrounding method the advice gets not executed anymore
(meaning the pointcut is not matched of course).
anybody any idea?
ciao robertj
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