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From Rahul Akolkar <rahul.akol...@gmail.com>
Subject Re: [SCXML] Log output?
Date Thu, 26 Mar 2009 23:06:52 GMT
Please post in plain text or "internet style" as some email clients
like to call it ...

On Wed, Mar 25, 2009 at 9:39 AM, Anna Södling <anna.sodling@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:
>>
>>
>> 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
>>
>
>
> That seems OK to me (other than the fact it appeared twice, probably a
> cut-n-paste error?).
>
<snip/>
> No, it was supposed to enter state A twice during the running of the
> state machine...though I guess I didn't really have to paste both
> outputs :)
> However, I'm wondering if there is some way to "clean up" the output? If
> possible, I would like to remove the "org.apache.commons.scxml.model.Log
> execute" and put the date and info on the same row.
>
<snap/>

You'll have to look into a formatter / layout for the logging library
you are using (or introduce one so you can do more than the
commons-logging SimpleLog).


>> 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 -tag works?
>>
>
>
> Please say more about the Java code which contains these print
> statements. Are you using an AbstractStateMachine subclass, an
> SCXMLListener or something else? ( content in the SCXML
> document executes before code in both those specific cases).
>
<snip/>
> We're using an AbstractStateMachine...we haven't extended it (since this
> didn't work for some reason), but rather copied it and added some parts.
> But it's a kind of ASM very similar to the original.
> We have a little problem with this line of code in the onentry-listener
> though:
> invoke(entered.getId());
> Without it, we only get the original output, but when we add it, we get
> a whole lot of error messages. We're not sure what it is doing, or
> invoking?
>
<snap/>

As the class Javadoc says, it calls the namesake method in the class
for each state that has been entered.


>
> If you want more fine-grained control about the timing of your
> procedural code within state changes (or sequencing even within a
> particular or ), 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.
>
<snip/>
>
>
> We've tried with several log expressions, some in onentry-tags, and some
> not. Even though they're not shown exactly where we want to, they seem
> to be shown in the right order. But, is this maybe a coincidence?
>
<snap/>

I don't think so, but its hard to say anything without knowing the code.

-Rahul


> /Anna
>
>
>
> .
>
>

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