| RE: [aspectj-users] Frustrated Newbie |
Kevin, I guess the question that springs into my mind is, when implementing any new technology you can and should expect some sort of ramp up period. It sounds to me like that is in part what has played into your frustrations. I know I for one has spent many hours on learning a new framework, getting frustrated, etc. until I hit that ah ha moment where it finally clicked. I would say that using AJDT within Eclipse should help you tremendously in accelerating the learning curve because you get immediate visual feedback on what may/may not be wrong with your pointcut definitions. I remember a time when AJDT did not exist and you have to perform trial and error and generate the source to find out what was going on. I have experience using AJ for mission critical applications and it worked just fine. I used it to convert an entire section of my application to effectively implement a template method without changing the external interface of that section of code. Ron ________________________________ From: aspectj-users-bounces@xxxxxxxxxxx on behalf of Kevin F Sent: Sun 2/25/2007 12:15 PM To: aspectj-users@xxxxxxxxxxx Subject: Re: [aspectj-users] Frustrated Newbie Thanks. Actually, I want to use it to implement various mission critical orthogonal crosscuts to dramatically improve project velocity for a deadline in early April. Do you have experience using AJ for mission critical functionality? I spent 30+ hours on this problem in the 4 days so I will be able to devote time to fixing problems as long as I can observe the effects of my AJ changes. How likely is it that I'll run into any more circumstances where my pointcuts filter far too many joinpoints such as my example below (118 when >3000 should have been found)? Debugging problems of the nature "the ubiquitous framework chooses not to call my code" are extreme timewasters. Kevin ________________________________ From: Dean Wampler <dean@xxxxxxxxxxxxxxxxxxxxx> Organization: Aspect Programming Reply-To: <aspectj-users@xxxxxxxxxxx> Date: Sun, 25 Feb 2007 10:51:52 -0600 To: <aspectj-users@xxxxxxxxxxx> Subject: Re: [aspectj-users] Frustrated Newbie I'm glad you made some headway. I'm not sure if your original installation process caused problems. I think it should have worked, but I've only used the feature installer myself. I do believe it's wise to proceed cautiously, since as you've seen, it can take some effort to understand the join point language and other aspects (pardon the pun ;) of AspectJ. I don't know what other aspects you've tried to use, but "policy enforcement" aspects like the one you posted are a good place to start, since they don't implement production functionality, but provide a supporting development role. As you build confidence, you can proceed to more "missing critical" aspects. Best wishes. dean Kevin F wrote: Re: [aspectj-users] Frustrated Newbie Paulo & Dean, thank you for your replies. I had given up and was actually in the process of purging AspectJ from my project when they arrived. So, I copied my AspectJ-free project to a new directory and used the Eclipse option to convert to AJ project. I didn't think your suggestions were going to help since the failure I had been getting were on the expression "within(com.mycompany..*+)"; however, I tried anyway. Amazingly, things seemed to behave exactly as they should. With this happy event, I tried the tests from my original posting. At the time of posting, the pointcut "within(com.mycompany..*+)" allowed 118 join points. Now, it allows > 3000 which is approximately what I expected. When I thought back on my installation within Eclipse 3.2.1, I downloaded AJDT from eclipse.org, extracted the file, copied the features to .../eclipse_3.2.1/features/, and copied the plugins to .../eclipse_3.2.1/plugins. When I installed AJDT for Eclipse 3.3M5, I used the feature installer. Is it possible that an improper installation the first time caused my AJ project to be setup incorrectly and caused all my problems? Due to my 4 days of pain, I am a bit timid at the moment; however, I want to believe that AJ is stable and reliable because 1. it is used in a lot of projects 2. it has the awesome power (for good or bad) to make massive changes to the code that I write 3. Thanks again for the responses, Kevin ________________________________ From: Kevin F <aj@xxxxxxxxxxxxxxxxxxxxxxx> <mailto:aj@xxxxxxxxxxxxxxxxxxxxxxx> <mailto:aj@xxxxxxxxxxxxxxxxxxxxxxx> Reply-To: <aspectj-users@xxxxxxxxxxx> <mailto:aspectj-users@xxxxxxxxxxx> <mailto:aspectj-users@xxxxxxxxxxx> Date: Sun, 25 Feb 2007 08:07:22 -0500 To: <aspectj-users@xxxxxxxxxxx> <mailto:aspectj-users@xxxxxxxxxxx> <mailto:aspectj-users@xxxxxxxxxxx> Conversation: Frustrated Newbie Subject: [aspectj-users] Frustrated Newbie I've been at this for 4 days now. I had some good luck with a few initial cases where I was able to clean up some code and verify through testing it worked like a charm. I made a couple minor tweaks to those which broke them giving the technology an unreliable feel. I'm willing to write that off as inexperience. So I continued on and tried to implement some simple enforcement policies that I read in the book from the Eclipse Series (trying to support development by buying products and all). It isn't working at all and my frustration level trying to implement even simple enforcement policies is off the scale. Yesterday, I posted the following to the AspectJ newsgroup without a response yet. I continued researching on my own, even using the latest milestone AspectJ release for Eclipse 3.3M5. Still no luck. --------------- Newsgroup post: --------------- I'm new to AspectJ so please no flames. I'm using AJDT for Eclipse 3.2.1 and have been following the details from the "eclipse AspectJ" book. I'm trying to enforce simple errors such as "It is an error to implement any listener interface unless you also implement interface Foo." To do this, I want to try: pointcut listeners() : within(*..*Listener*+); pointcut myCode() : within(com.mycompany..*+); pointcut mySpecialInterface() : within(com.mycompany.Foo+); declare error: listeners() && myCode() && !mySpecialInterface() : "All listeners must implement Foo"; Since this did not work, I tried various experiments. So, I tried the following: declare error: within(*..*Listener*+) : "A"; declare error: within(com.mycompany..*+) : "B"; declare error: within(*..*Listener*+) && within(com.mycompany..*+) : "A intersect B"; declare error: within(*..*Listener*+ && com.mycompany..*+) : "A intersect' B"; declare error: within(*..*Listener*+) || within(com.mycompany..*+) : "A union B"; declare error: within(*..*Listener*+ || com.mycompany..*+) : "A union' B"; A seems to be tagged correctly on all classes that implement any interface with the word Listener in its name. B seems to tag only a fraction of the classes I have written. A intersect B and A intersect' B both result in no tags. A union B and A union' B both seem to result in the union of what A and B tagged above. AOP seems so powerful yet so cryptic. Can anybody help? ________________________________ _______________________________________________ aspectj-users mailing list aspectj-users@xxxxxxxxxxx https://dev.eclipse.org/mailman/listinfo/aspectj-users ________________________________ _______________________________________________ aspectj-users mailing list aspectj-users@xxxxxxxxxxx https://dev.eclipse.org/mailman/listinfo/aspectj-users -- Dean Wampler's Signature Dean Wampler, Ph.D. dean at aspectprogramming.com objectmentor.com <http://www.objectmentor.com> <http://www.objectmentor.com/> aspectprogramming.com <http://www.aspectprogramming.com> <http://www.aspectprogramming.com/> contract4j.org <http://www.contract4j.org> <http://www.contract4j.org/> I want my tombstone to say: Unknown Application Error in Dean Wampler.exe. Application Terminated. Okay Cancel ________________________________ _______________________________________________ aspectj-users mailing list aspectj-users@xxxxxxxxxxx https://dev.eclipse.org/mailman/listinfo/aspectj-users
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