Re: [aspectj-users] Reducing code overhead

["Konstantin Vandev" <konstantin_vandev@xxxxxxxxxxx>]

Thanks for help. Unfortunately the difference is about 10K only. Maybe that's because I can't replace the around advices. Mistakingly I've uncommented the proceed()-s in the sample code.

I would like to ask you another question: Is it possible to eliminate from advicing sone tags, which are "empty" - e.g they don't contain any setters? I would like to do this by pointcuts, not by enumerating them, because their number is around 30 and this could change in the future.

 

Thanks in advance, Konstantin   

 

 

----- Original Message -----

From: Adrian Colyer

To: aspectj-users@xxxxxxxxxxx

Sent: Friday, April 23, 2004 3:02 PM

Subject: Re: [aspectj-users] Reducing code overhead

Try replacing the around advice with before - there will be less code generated and it doesn't look like you actually need around advice in this instance. By avoiding non-static use of thisJoinPoint (the call to getArgs()) you'll get additional savings too.

So,

>     void around() : setters() || setters1()
>     {
>         Object arg = thisJoinPoint.getArgs()[0];
>         if(arg != null)
>           savedAttributes_.put(thisJoinPoint.getSignature().getName(), arg);
>         proceed();
>     }

becomes:

before(Object arg) : (setters() || setters1()) && args(arg) {
  if (arg != null)
    savedAttributes_.put(thisJoinPointStaticPart.getSignature().getName(),arg);
}

and

>     void around() : special_setters() || special_setters1()
>     {
>         Object arg = thisJoinPoint.getArgs()[0];
>         if(arg != null)
>            savedAttributes_.remove(thisJoinPoint.getSignature().getName());
>         proceed();
>     }

becomes:

before(Object arg) : (special_setters() || special_setters1()) && args(arg) {
  if (arg != null)
    savedAttributes_.remove(thisJoinPointStaticPart.getSignature().getName(),arg);
}

I'm curious to know how much of a difference this makes in your system...

-- Adrian
Adrian_Colyer@xxxxxxxxxx

aspectj-users-admin@xxxxxxxxxxx wrote on 23/04/2004 12:05:28:

> Hi,
> We decided to use AspectJ in our product TICL. I wrote an aspect and
> everything is working, but there's a
> quite big overhead and the resulting jar has grow with around 400K. So I'd
> like to ask for some advices how
> to cut down this overhead. Let me fisrt descrive what is our aspect supposed
> to do. We have a bunch of
> classes (around 90) representing custom JSP tags, which should be modified
> in a way to provide EL support.
> We have written such classes too, but because  the code is very similar, we
> decided to use an aspect to get
> rid of those EL classes. So what is our aspect supposed to do: it should
> intercept all doStartTag(), doEndTag()
> methods, and all setters. The string setters should be handled differently
> that all other setters. I've applided every
> possible restriction taht i'm aware of, but I'm not an AspectJ expert, so
> i'd like to ask you for some help.
> The code is given below:
>
> aspect ElAspect perthis(tags())
> {
>     pointcut tags(): (this(TICLTagSupport+) || this(TICLBodyTagSupport+))
>      && within(com.kobrix.ticl.tags.*) &&
> !within(com.kobrix.ticl.tags.el.*);
>
>     //calls that must pass without our modifications
>     pointcut spec(): withincode(void ElAspect.restoreAttributes(Object)) ||
>     withincode(void ElAspect.saveAndEvaluateAttributes(Object));
>
>     pointcut setters(): execution(public void TICLTagSupport+.set*(String))
> && target(TICLTagSupport+)&& !cflow(spec());
>     pointcut setters1(): execution(public void
> TICLBodyTagSupport+.set*(String)) && target(TICLBodyTagSupport+) &&
> !cflow(spec());
>
>     void around() : setters() || setters1()
>     {
>         Object arg = thisJoinPoint.getArgs()[0];
>         if(arg != null)
>           savedAttributes_.put(thisJoinPoint.getSignature().getName(), arg);
>         proceed();
>     }
>
>     pointcut special_setters():  call(public void TICLTagSupport+.set*(*))
>     && !call(public void TICLTagSupport+.set*(String)) &&
> target(TICLTagSupport+);
>     pointcut special_setters1():  call(public void TICLTagSupport+.set*(*))
>     && !call(public void TICLBodyTagSupport+.set*(String)) &&
> target(TICLBodyTagSupport+);
>
>
>     void around() : special_setters() || special_setters1()
>     {
>         Object arg = thisJoinPoint.getArgs()[0];
>         if(arg != null)
>            savedAttributes_.remove(thisJoinPoint.getSignature().getName());
>         proceed();
>     }
>
>     pointcut doStartTag(Object tag): execution(public int
> TICLTagSupport+.doStartTag())
>     && target(tag) && !cflowbelow(execution(public int
> TICLTagSupport+.doStartTag()));
>     pointcut doStartTag1(Object tag):  execution(public int
> TICLBodyTagSupport+.doStartTag()) &&
>     target(tag) && !cflowbelow(execution(public int
> TICLBodyTagSupport+.doStartTag()));
>
>     before(Object tag) : doStartTag(tag) || doStartTag1(tag)
>     {
>         saveAndEvaluateAttributes(tag);
>     }
>
>     pointcut doEndTag(TICLTagSupport tag):  execution(public int
> TICLTagSupport+.doEndTag())
>     && this(tag) && !cflowbelow(execution(public int
> TICLTagSupport+.doEndTag()));
>     pointcut doEndTag1(TICLBodyTagSupport tag):  execution(public int
> TICLBodyTagSupport+.doEndTag())
>     && this(tag) && !cflowbelow(execution(public int
> TICLBodyTagSupport+.doEndTag()));
>
>     after(Object tag) : doEndTag(tag) || doEndTag1(tag)
>     {
>         restoreAttributes(tag);
>     }
>
>     //setXXX/value
>     private final Map savedAttributes_ = new HashMap();
>
>     private void saveAndEvaluateAttributes(Object tag)
>     {
>         //some code here
>     }
>
>     private void restoreAttributes(Object tag)
>     {
>        //some code here
>     }
> }
>
> All the tags are subclasses of TICLBodyTagSupport or TICLTagSupport.
>
> Thanks in advance, Konstantin
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