Re: [aspectj-users] Aspectj

[Andy Clement <andrew.clement@xxxxxxxxx>]

Hi Marcos, didn't I already answer some of this in my 26th May mailing
list response to you?  Including my response below, with further
information under that:

On 26 May 2010 08:08, Andy Clement <andrew.clement@xxxxxxxxx> wrote:
>
>> Modify the JVM,
>
> If you mean 'enable it to load time weave' then you have to run with the agent
> java -javaagent:aspectjweaver.jar Foo
>
> If you mean 'weave into the system classes' then I recommend you do
> binary weaving
>
> ajc -inpath rt.jar MyAspect.aj -outjar newrt.jar
> (then slap it on the bootclasspath so it is picked up ahead of the old rt.jar)
>
>> Compile-time
>
> ajc A.java B.java C.aj -1.5 -showWeaveInfo
> // or use AJDT
>
>> post-compile
>
> ajc Code.java -outjar code.jar
> ajc Aspect.java -outjar aspect.jar
>
> ajc -inpath code.jar -aspectpath aspect.jar -outjar wovencode.jar
>
>> load-time
>
> ajc Code.java
> ajc Aspectj.java -outxml -outjar aspect.jar
>
> java -javaagent:aspectjweaver.jar Code
> // if aspect.jar is on the classpath, the aop.xml file inside will be
> found and Code will be woven when executing
>
>> run-time
>
> we don't do runtime weaving.  You either weave something in that can
> be switched at runtime (a switchable boolean), or you attempt loadtime
> weaving with hotswap, which is experimental
>
>> if you have code samples
>> showing how to use these mechanisms for weaving will help me a lot, so would
>> facilitate my understanding;
>
> more context about what you want to know would help...  did you try
> the documentation?
>
> Andy
>

Marcos wrote:
> So I would like to know how to use each of these weaving;
> ex: I want to use loadtime what I gotta do to use this waving, I have to
> import a library, but less so or would like to know.

See above, and see documentation: eg. for loadtime weaving:
http://www.eclipse.org/aspectj/doc/next/devguide/ltw.html

> If you have any gif or image examples of code weaving dass help me much, so
> I would compare them and see how they
> work ok, and through the code to have a better sense of what each one does:

If you really need to look at the woven code, use javap -verbose.
Understanding the woven code isn't really the best approach to
learning AOP though, the woven code is just the implementation
details.  I would recommend looking at the AspectJ documentation.

cheers
Andy

On 14 June 2010 17:50, Marcos Da Costa <nightcrowls@xxxxxxxxx> wrote:
> Hi;
> I am starting now aspect-oriented programming;
>
> I would like to understand more about weaving in aspectj, and if someone
> could help me understand a little
> about each weaving mechanism with examples of weaving the following code:
>
> Load-time:
> Post-compile:
> Compile-time
> Modify the JVM:
> Run-time:
>
> So I would like to know how to use each of these weaving;
> ex: I want to use loadtime what I gotta do to use this waving, I have to
> import a library, but less so or would like to know.
> If you have any gif or image examples of code weaving dass help me much, so
> I would compare them and see how they
> work ok, and through the code to have a better sense of what each one does:
>
> --
> Att;
> Marcos
>
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