[kepler-dev] Kepler visual monitors

[Carlos Rueda]

Hi all,

I have a first prototype of a new Kepler functionality that allows the 
dynamic association of visual monitor attributes to the entities in a 
workflow, and I would like at this point to check it in, so some of you 
can try it and give me some feedback. However, I'm getting ``kepler: cvs 
commit: Pre-commit check failed.'' can someone please grant me write 
access to the CVS?

Since the code for this prototype uses some java 1.5 features, I will 
start by only checking in the compiled classes 
($KEPLER/lib/jar/kepler-monitor.jar) for now, as well as some demo 
workflows in $KEPLER/workflows/test/monitor/.
Attached is kepler-monitor.zip with these files if you want to try in 
the meantime. Also attached is a screenshot of one tests.

BTW, I'm not sure if java 1.5 features are OK for the kepler code base; 
can someone please confirm before I start retro-translating my code?  ;)

The overall goal of a monitor icon is to reflect the state of execution 
of an actor. For example, using a traffic light icon, the behavior would 
be like this: green -> the actor is active; yellow -> the actor has been 
idle or waiting for input for some time; red -> some error has occurred 
that prevents the actor from continuing its execution. The current 
prototype includes this basic scheme but there are several aspects to be 
examined:

- can we make the whole functionality MoC-independent? (The current 
prototype doesn't have any dependency of this kind but perhaps there are 
  special cases to consider).

- Customization. Some built-in monitoring schemes should of course be 
included for easy use, but also an API for developers to extend the 
functionality, eg., by defining new icon styles and execution states. 
This is particularly relevant when internal events should be reflected 
in the icons. The prototype provides a first approach in this direction, 
but state transitions are only determined by events associated to the 
ports in the actors (call these "external events").

Thanks and best regards,

Carlos
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