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Re: [aspectj-users] Passing a parameter created in the advice to the pointcut implementation
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Hi Holger.
Some more or less extensive code snippets would be helpful, but as far as I understand you want to inject a value into certain objects. Unless there is some kind of "value store" such as a map of key/value pairs or so in your object, you can use ITD (inter-type definition) in order to add members to the desired types.
If you provide some sample code - ideally a fully functional SSCCE (http://sscce.org/) - I am sure someone will suggest an aspect which will show you how to do that based on your code. Concrete examples are usually more helpful than abstract ones.
Tit for tat, code for code - deal? ;-)
Regards
--
Alexander Kriegisch
http://scrum-master.de
Holger King schrieb am 18.02.2015 23:04:
> I just moved a cross-cutting-concern (the creation and closing of a
> non-JDBC-connection) from a web service to a Spring AOP AspectJ
> implementation. This aspect is being called each time any method of the
> web service interface is requested.
>
> The problem: the pointcut (= web service implementation) needs the
> connection being created in the advice! But as the method signatures are
> defined by the web service contract (the WSDL document has been
> converted to Java classes via "wsdl2java" based on the contract first
> approach) they cannot be adapted and modified to take over the new
> connection parameter.
>
> It's clear that the other way around where the AspectJ advice gets the
> parameter used in the method call matching the pointcut defintion is
> possible.
>
> Even changing existing parameter values and passing the same arguments
> list (having the same types) to the implementation where the pointcut
> matches does work (using "&& args()" in the pointcut in combination with
> joinpoint.proceed(jointpoint.getArgs()))
>
> But here the problem exists, as it's not sufficient to just change
> parameter values. Instead, a complete new variable owning the connection
> created in the advice needs to be accessible in the objects the pointcut
> matches.
>
> Do you have any idea how to realize that? Or is it a complete wrong
> approach to do that using Java aspects - although connection handling
> might be a typical cross-cutting-concern?
