[slf4j-dev] Repost

[Thorbjørn Ravn Andersen]

Ceki Gulcu skrev  den 25-08-2008 15:53:
> Thank you for posting your message.
>
> For those who missed older messages, Thorbjørn  is adapting his work on adding 
> logging statements on classes through byte code generation. This was published 
> in an article entitled "Add Logging at Class Load Time with Java 
> Instrumentation". The URL is
>
> http://today.java.net/pub/a/today/2008/04/24/add-logging-at-class-load-time-with-instrumentation.html
>   
Enclosed please find an initial conversion just so people can see what 
this is about.

=== LOADING SOURCE

I am using eclipse -  follow these steps to set up starting with a blank 
workspace:

* Save the attached zip file, e.g to C:\slf4j-agent-projects.zip

* In Eclipse choose File -> Import

* Open "General", click "Existing projects into workspace". Click Next

* Select "Select archive file" radiobutton, and browse to the archive 
saved before.

The projects "org.slf4j.instrumentation" and 
"slf4j-instrumentation-helloworld" are found, and both are checked.

* Click "Finish"

The projects are loaded into Eclipse. You most likely want to switch to 
the Java perspective (Windows->Open Perspective -> Other -> Java).

==== RUNNING DEMO IN ECLIPSE

* Open the "slf4j-instrumentation-helloworld" project, and open the 
"build.xml" file.

You should see colours in the build.xml window indicating that Eclipse 
knows about Ant.

* Open the outline view with Windows->Show view ->Outline"

You should see a tree view of the xml file in the outline view, right 
click on the "All" node, and choose "Run as" -> "Ant build" (note:  not 
the line with three dots after "Ant build").  

=== DEMO OUTPUT

Buildfile: C:\Documents and Settings\TRA\Workspaces\MyEclipse 6.5 - 
Pulse Edition\slfj4-instrumentation-helloworld\build.xml
compile:
   [delete] Deleting directory C:\Documents and 
Settings\TRA\Workspaces\MyEclipse 6.5 - Pulse 
Edition\slfj4-instrumentation-helloworld\output
    [mkdir] Created dir: C:\Documents and 
Settings\TRA\Workspaces\MyEclipse 6.5 - Pulse 
Edition\slfj4-instrumentation-helloworld\output
    [javac] Compiling 1 source file to C:\Documents and 
Settings\TRA\Workspaces\MyEclipse 6.5 - Pulse 
Edition\slfj4-instrumentation-helloworld\output
withoutAgent:
     [java] Hello World - through println
     [java] 22:36:55.125 [main] INFO  demo.HelloWorld - Hello World - 
through slf4j
withAgent:
     [java] Start at Thu Aug 28 22:36:55 CEST 2008
     [java] org.slf4j.LoggerFactory.getLogger(demo.HelloWorld.class);
     [java] 22:36:55.468 [main] INFO  demo.HelloWorld - >> main(args=[])
     [java] Hello World - through println
     [java] 22:36:55.468 [main] INFO  demo.HelloWorld - >> 
class$(x1=demo.HelloWorld)
     [java] 22:36:55.468 [main] INFO  demo.HelloWorld - << 
class$(x1=demo.HelloWorld) returns: class demo.HelloWorld
     [java] 22:36:55.468 [main] INFO  demo.HelloWorld - Hello World - 
through slf4j
     [java] 22:36:55.468 [main] INFO  demo.HelloWorld - << main(args=[])
     [java] Stop at Thu Aug 28 22:36:55 CEST 2008, execution time = 187 ms
all:
BUILD SUCCESSFUL
Total time: 2 seconds

===

That's it :)

Note the "class$" invocation in the output.  It doesn't show when I run 
the program directly from Eclipse.  Wonder why :)

Comments are very welcome.  Ceki, perhaps you could open a sandbox 
corner for me in SVN?  Makes it easier to share code...

-- 
  Thorbjørn Ravn Andersen          "... plus... Tubular Bells!"

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