RE: [aspectj-users] Is this possible with Aspect/J?

["Conway. Fintan (IT Solutions)" <Fintan.Conway@xxxxxx>]

Hi Cees,

You can write a pointcut which captures first argument, and pass this
argument into your around advice.
E.g. pointcut authorisableMethod(String key) :  execution(* *.*(String,
..)) && args(key)

"key" matches the first parameter passed to your method, since the
parameter list is specified as 'String, ...' - The first parameter is a
String and the other paramaters can be any Type and have any number of
other parameters. (in this case * *.* matches all methods)

Your around advice will use this "key" value to do the authorising.  A
call to proceed() without any arguments will cause the original method
to continue executing *with all of its original parameters*.

E.g. 
Object around(String key) : authorisableMethod(key) {
	Logger log = ????????;
	Account account = AuthenticationHelper.getInstance
().getAccountByKey (key);
	if (account == null) {
		log.logFailedLogin();
		return new AttributeArrayResult("invalid key");
	} else {
		Object thingy = proceed();
		return thingy;
	}
}	

Hopefully this should work,

Fintan


-----Original Message-----
From: aspectj-users-bounces@xxxxxxxxxxx
[mailto:aspectj-users-bounces@xxxxxxxxxxx] On Behalf Of Cees De Groot
Sent: 07 July 2006 10:34
To: aspectj-users@xxxxxxxxxxx
Subject: [aspectj-users] Is this possible with Aspect/J?


Hi,

I have a SOAP interface where one method, login(), generates a cookie
which all other methods have to send as the first parameter. So all the
other methods look like:

       public AttributeArrayResult getExtendedTransactionStatus(String
key, long transactionId) {
               Account account = AuthenticationHelper.getInstance
().getAccountByKey (key);
               if (account == null) {
                       logFailedLogin();
                       return new AttributeArrayResult("invalid key");
               }

              // ... do actual work
       }

Clearly, the authentication check is an aspect that screams to be
refactored away. However, the various methods have different signatures
with different numbers of arguments, and I haven't been able to find how
to write around advice that handles this. Is this possible at all?

(in Smalltalk, I'd just do

self authenticatedWith: key do: [
    // ... do actual work
]

but using the whole anonymous inner class mess in Java just to pass a
bit of code actually makes it less readable)
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