[SCXML] Log output?

[Anna Södling <an...@passagen.se>]

Hi,


I want to use some logging in my scxml-file, for example upon entering
and exiting a state. Unfortunately, I can't seem to get the hang of how
it works. I've got this line in my scxml-file:
<log label="'Renegade'" expr="'Entering state: A'"/>

And the log output I get (in a console window in Eclipse) looks like
this:
2009-mar-24 11:39:08 org.apache.comm
ons.scxml.model.Log execute
INFO: 'Renegade': Entering state: A
2009-mar-24 11:39:08 org.apache.commons.scxml.model.Log execute
INFO: 'Renegade': Entering state: A

Also, I'm doing some ordinary printed outputs (in Java) while I'm
running my state machine, and the log info is not placed on the right
place among these outputs either, but before all of them (so it doesn't
show up when I'm actually entering the state).
And that's not really what I wanted. I would simply like to have an
output that says "'Renegade': Entering state: A" (or something similar)
when I'm actually entering state A. Is this possible? Or have I
missunderstood how the <log>-tag works?

Sincerely,
Anna




<P><p><font face="Arial, Helvetica, sans-serif" size="2" style="font-size:13.5px">_______________________________________________________________<BR> </font>

Re: [SCXML] Log output?

[Rahul Akolkar <ra...@gmail.com>]

On Tue, Mar 24, 2009 at 7:49 AM, Anna Södling <an...@passagen.se> wrote:
> Hi,
>
>
> I want to use some logging in my scxml-file, for example upon entering
> and exiting a state. Unfortunately, I can't seem to get the hang of how
> it works. I've got this line in my scxml-file:
> <log label="'Renegade'" expr="'Entering state: A'"/>
>
> And the log output I get (in a console window in Eclipse) looks like
> this:
> 2009-mar-24 11:39:08 org.apache.comm
> ons.scxml.model.Log execute
> INFO: 'Renegade': Entering state: A
> 2009-mar-24 11:39:08 org.apache.commons.scxml.model.Log execute
> INFO: 'Renegade': Entering state: A
>
<snip/>

That seems OK to me (other than the fact it appeared twice, probably a
cut-n-paste error?).


> Also, I'm doing some ordinary printed outputs (in Java) while I'm
> running my state machine, and the log info is not placed on the right
> place among these outputs either, but before all of them (so it doesn't
> show up when I'm actually entering the state).
> And that's not really what I wanted. I would simply like to have an
> output that says "'Renegade': Entering state: A" (or something similar)
> when I'm actually entering state A. Is this possible? Or have I
> missunderstood how the <log>-tag works?
>
<snap/>

Please say more about the Java code which contains these print
statements. Are you using an AbstractStateMachine subclass, an
SCXMLListener or something else? (<onentry> content in the SCXML
document executes before code in both those specific cases).

If you want more fine-grained control about the timing of your
procedural code within state changes (or sequencing even within a
particular <onentry> or <onexit>), that kind of thing can be achieved
by using custom actions [1] to call your code from the appropriate
place(s) in SCXML executable content.

-Rahul

[1] http://commons.apache.org/scxml/guide/custom-actions.html


> Sincerely,
> Anna
>
>
>

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