You are viewing a plain text version of this content. The canonical link for it is here.
Posted to user@commons.apache.org by Linda Erlenhov <li...@gmail.com> on 2009/03/31 13:46:05 UTC
[SCXML] getting set datats in the datamodel
Hello again!
I have a problem with my datamodel. Or rather the fetching of datas that are
used in the datamodel.
I have my editor for building statemachines graphical, this is then
"translated" into a corresponding SCXML document that then is run "normally"
with Apache commons. The person that uses the editor shoul amongst other
things be able select if she/he has want´s some data to be set (integers or
strings) when entering states.
The GUI that communicates with the machine does this via an interface wich
is the thing I´m writing now. The GUI can send subscriptions requests for
data wich basically means that it wants to subscribe certain data and wants
the interface to send it when the data is changed.
How I solved the part of saving checking the data is somewhat irrelevant,
the problem is when I want to fetch the data that is saved. Since the model
doesn´t "tell" when data has changed I check whenever entering a state
(onEntry Listner) but where do I check this.
Where is this, the data, saved?
best regards
//Linda
Re: [SCXML] getting set datats in the datamodel
Posted by Linda Erlenhov <li...@gmail.com>.
Hello Armel
Me and another girl named Anna has build the editor using GMF, Graphical
modeling framework for Eclipse (http://www.eclipse.org/modeling/gmf/) as a
part of our Master Thesis project.
best regards
//Linda
On Fri, Apr 3, 2009 at 11:59 AM, Armel SORO <ar...@gmail.com>wrote:
> Hi Linda,
>
> This is not really an answer to the problem but a simple question: which
> kind of graphical editor do you use to build state machines?
> Was it built from scratch or did you use any specific software to do this?
>
> I am indeed interesting in using one like that to model my system and
> generate the corresponding SCXML document.
>
> B.R.
>
> --
> Armel
>
>
> 2009/3/31 Linda Erlenhov <li...@gmail.com>
>
> > Hello again!
> >
> > I have a problem with my datamodel. Or rather the fetching of datas that
> > are
> > used in the datamodel.
> > I have my editor for building statemachines graphical, this is then
> > "translated" into a corresponding SCXML document that then is run
> > "normally"
> > with Apache commons. The person that uses the editor shoul amongst other
> > things be able select if she/he has want´s some data to be set (integers
> or
> > strings) when entering states.
> > The GUI that communicates with the machine does this via an interface
> wich
> > is the thing I´m writing now. The GUI can send subscriptions requests for
> > data wich basically means that it wants to subscribe certain data and
> wants
> > the interface to send it when the data is changed.
> > How I solved the part of saving checking the data is somewhat irrelevant,
> > the problem is when I want to fetch the data that is saved. Since the
> model
> > doesn´t "tell" when data has changed I check whenever entering a state
> > (onEntry Listner) but where do I check this.
> > Where is this, the data, saved?
> >
> > best regards
> > //Linda
> >
>
Re: [SCXML] getting set datats in the datamodel
Posted by Armel SORO <ar...@gmail.com>.
Hi Linda,
This is not really an answer to the problem but a simple question: which
kind of graphical editor do you use to build state machines?
Was it built from scratch or did you use any specific software to do this?
I am indeed interesting in using one like that to model my system and
generate the corresponding SCXML document.
B.R.
--
Armel
2009/3/31 Linda Erlenhov <li...@gmail.com>
> Hello again!
>
> I have a problem with my datamodel. Or rather the fetching of datas that
> are
> used in the datamodel.
> I have my editor for building statemachines graphical, this is then
> "translated" into a corresponding SCXML document that then is run
> "normally"
> with Apache commons. The person that uses the editor shoul amongst other
> things be able select if she/he has want´s some data to be set (integers or
> strings) when entering states.
> The GUI that communicates with the machine does this via an interface wich
> is the thing I´m writing now. The GUI can send subscriptions requests for
> data wich basically means that it wants to subscribe certain data and wants
> the interface to send it when the data is changed.
> How I solved the part of saving checking the data is somewhat irrelevant,
> the problem is when I want to fetch the data that is saved. Since the model
> doesn´t "tell" when data has changed I check whenever entering a state
> (onEntry Listner) but where do I check this.
> Where is this, the data, saved?
>
> best regards
> //Linda
>
Re: [SCXML] getting set datats in the datamodel
Posted by Linda Erlenhov <li...@gmail.com>.
Hello again!
This seems to work, since we now can see that data has changed.
Unfortunately, we seem to have missed out an important part of the
question. In addition to being notified when a data value is set, we
also would like to be able to "get/recieve" the new data value aswell as the
name (in this case numdat) so that we can display it to the screen in our
interface.
And, in this example we only have one data value, NumDat. However, it
is possible to define several data values insade the DynamicData-tag.
Can we still just write <assign name="DynamicData"
expr="DynamicData"/> after the first assign tag, or do we also have to
define what data value has been changed?
Sincerely,
Linda
> <snip/>
>
> Yup, I see what you are running into. Unfortunately for the specific
> usage pattern here, the two <assign> variations have different
> semantics as follows:
>
> 1) <assign name="..." expr="..."/>
> is a set operation, which produces a Context#set(...) call
>
> 2) <assign location="..." expr="..."/>
> is really a mutation operation, it retrieves the XML <data> tree
> (stored as a DOM node in memory) and manipulates it -- there is no
> call to Context#set(...)
>
>
> >> How do I notify when my DynamicData has changed?
> >>
> <snap/>
>
> ISTR that you prefer to not use custom actions. With those
> constraints, one option (since you are generating all the SCXML) is to
> accomodate for the above variation via the SCXML markup itself -- so
> you could generate a redundant identity assignment to trigger the
> Context#set(...) call like so:
>
> <!-- assignment below taken from example above -->
> <assign location="Data(DynamicData,'NumDat')"
> expr="Data(DynamicData,'NumDat')+1"/>
> <!-- followed by assignment that triggers the set call with the new value
> -->
> <assign name="DynamicData" expr="DynamicData"/>
>
> -Rahul
>
Re: [SCXML] getting set datats in the datamodel
Posted by Rahul Akolkar <ra...@gmail.com>.
On Wed, Apr 22, 2009 at 9:35 AM, Linda Erlenhov
<li...@gmail.com> wrote:
> Hello
> Is there anybody that can help me with my problem described below?
>
> best regards
> //Linda
>
> On Mon, Apr 20, 2009 at 2:05 PM, Linda Erlenhov <li...@gmail.com>wrote:
>
>> Hello
>> I think I´ve done some mixing between two things that doesn´t work together
>> as I hoped it would.
>>
>> I have this Datamodel, the scxml document starts like this:
>> ------------------------
>> <scxml version="1.0" initialstate="INIT" xmlns:cs="
>> http://commons.apache.org/scxml" xmlns="http://www.w3.org/2005/07/scxml">
>>
>> <datamodel>
>> <data name="DynamicData">
>> <NumDat xmlns="" id="1" type="Integer">0</NumDat>
>> </data>
>> <data name="Indication1" expr="false"/>
>> </datamodel>
>>
>> <snip/>-------------------------
>>
>> I assign the "Indication1" later on:
>>
>> ---------------
>> <state id="StateC">
>> <onentry>
>> <log label="Renegade" expr="'Entering state: StateC'"/>
>> <assign name="Indication1" expr="true"/>
>> </onentry>
>>
>> <snip/>-------------------------------
>>
>> And the "DynamicData" also later:
>> ---------------
>> <state id="StateB">
>> <onentry>
>> <log label="Renegade" expr="'Entering state: StateB'"/>
>> <log label="Renegade" expr="Data(DynamicData,'NumDat')"/>
>> <assign location="Data(DynamicData,'NumDat')"
>> expr="Data(DynamicData,'NumDat')+1"/>
>> <log label="Renegade" expr="Data(DynamicData,'NumDat')"/>
>> </onentry>
>>
>> <snip/>-------------------------------
>>
>> I implemented a custom context with a notification functionality in the
>> "set" function (observer observed pattern) but the problem now is that the
>> only time the "set" function in the context is used is when indications are
>> set. Not when the DynamicData is set. I know that the SCXML works and that
>> the expressions evaluate properly because of the log:labels, my guess is
>> that it´s something with the Data() function that makes these expressions do
>> something different. What? Where is the "set" for the DynamicData located?
<snip/>
Yup, I see what you are running into. Unfortunately for the specific
usage pattern here, the two <assign> variations have different
semantics as follows:
1) <assign name="..." expr="..."/>
is a set operation, which produces a Context#set(...) call
2) <assign location="..." expr="..."/>
is really a mutation operation, it retrieves the XML <data> tree
(stored as a DOM node in memory) and manipulates it -- there is no
call to Context#set(...)
>> How do I notify when my DynamicData has changed?
>>
<snap/>
ISTR that you prefer to not use custom actions. With those
constraints, one option (since you are generating all the SCXML) is to
accomodate for the above variation via the SCXML markup itself -- so
you could generate a redundant identity assignment to trigger the
Context#set(...) call like so:
<!-- assignment below taken from example above -->
<assign location="Data(DynamicData,'NumDat')"
expr="Data(DynamicData,'NumDat')+1"/>
<!-- followed by assignment that triggers the set call with the new value -->
<assign name="DynamicData" expr="DynamicData"/>
-Rahul
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org
Re: [SCXML] getting set datats in the datamodel
Posted by Linda Erlenhov <li...@gmail.com>.
Hello
Is there anybody that can help me with my problem described below?
best regards
//Linda
On Mon, Apr 20, 2009 at 2:05 PM, Linda Erlenhov <li...@gmail.com>wrote:
> Hello
> I think I´ve done some mixing between two things that doesn´t work together
> as I hoped it would.
>
> I have this Datamodel, the scxml document starts like this:
> ------------------------
> <scxml version="1.0" initialstate="INIT" xmlns:cs="
> http://commons.apache.org/scxml" xmlns="http://www.w3.org/2005/07/scxml">
>
> <datamodel>
> <data name="DynamicData">
> <NumDat xmlns="" id="1" type="Integer">0</NumDat>
> </data>
> <data name="Indication1" expr="false"/>
> </datamodel>
>
> <snip/>-------------------------
>
> I assign the "Indication1" later on:
>
> ---------------
> <state id="StateC">
> <onentry>
> <log label="Renegade" expr="'Entering state: StateC'"/>
> <assign name="Indication1" expr="true"/>
> </onentry>
>
> <snip/>-------------------------------
>
> And the "DynamicData" also later:
> ---------------
> <state id="StateB">
> <onentry>
> <log label="Renegade" expr="'Entering state: StateB'"/>
> <log label="Renegade" expr="Data(DynamicData,'NumDat')"/>
> <assign location="Data(DynamicData,'NumDat')"
> expr="Data(DynamicData,'NumDat')+1"/>
> <log label="Renegade" expr="Data(DynamicData,'NumDat')"/>
> </onentry>
>
> <snip/>-------------------------------
>
> I implemented a custom context with a notification functionality in the
> "set" function (observer observed pattern) but the problem now is that the
> only time the "set" function in the context is used is when indications are
> set. Not when the DynamicData is set. I know that the SCXML works and that
> the expressions evaluate properly because of the log:labels, my guess is
> that it´s something with the Data() function that makes these expressions do
> something different. What? Where is the "set" for the DynamicData located?
> How do I notify when my DynamicData has changed?
>
>
> Best regards
> Linda
>
>
>
Re: [SCXML] getting set datats in the datamodel
Posted by Linda Erlenhov <li...@gmail.com>.
Hello
I think I´ve done some mixing between two things that doesn´t work together
as I hoped it would.
I have this Datamodel, the scxml document starts like this:
------------------------
<scxml version="1.0" initialstate="INIT" xmlns:cs="
http://commons.apache.org/scxml" xmlns="http://www.w3.org/2005/07/scxml">
<datamodel>
<data name="DynamicData">
<NumDat xmlns="" id="1" type="Integer">0</NumDat>
</data>
<data name="Indication1" expr="false"/>
</datamodel>
<snip/>-------------------------
I assign the "Indication1" later on:
---------------
<state id="StateC">
<onentry>
<log label="Renegade" expr="'Entering state: StateC'"/>
<assign name="Indication1" expr="true"/>
</onentry>
<snip/>-------------------------------
And the "DynamicData" also later:
---------------
<state id="StateB">
<onentry>
<log label="Renegade" expr="'Entering state: StateB'"/>
<log label="Renegade" expr="Data(DynamicData,'NumDat')"/>
<assign location="Data(DynamicData,'NumDat')"
expr="Data(DynamicData,'NumDat')+1"/>
<log label="Renegade" expr="Data(DynamicData,'NumDat')"/>
</onentry>
<snip/>-------------------------------
I implemented a custom context with a notification functionality in the
"set" function (observer observed pattern) but the problem now is that the
only time the "set" function in the context is used is when indications are
set. Not when the DynamicData is set. I know that the SCXML works and that
the expressions evaluate properly because of the log:labels, my guess is
that it´s something with the Data() function that makes these expressions do
something different. What? Where is the "set" for the DynamicData located?
How do I notify when my DynamicData has changed?
Best regards
Linda
Re: [SCXML] getting set datats in the datamodel
Posted by Rahul Akolkar <ra...@gmail.com>.
On Wed, Apr 15, 2009 at 12:34 PM, Linda Erlenhov
<li...@gmail.com> wrote:
> Hello
> So I´m back here again.
>
> My problem now is that I don´t know how to notify.
> I looked at the solution suggested below since I thought it would be the
> easiest and best looking way to implement this.
>
> The way my first solution worked was to use Observer and Observable. Since
> Observable is a class I could not extend SimpleContext aswell (since
> multiple inheritance from classes is not ok in java) so i just "copied"
> SimpleContext instead since it only implemented two Interfaces, extended
> Observable and modifyed it according to my liking.
<snip/>
I'd do it the other way, extend the Context implementation and add
observable functionality since I claim the latter is the simpler bit
(lower case o here, not referring to the java.util class -- minimally,
(a) maintain a list of observers as an instance field, (b) have an
adder method that adds observers to the list and (c) have the notify
method in question iterate over the observers to notify them of the
value change).
> The problem then was that
> to user timers (as I was asking about in another thread) and they use JEXL.
> So to make the timers work I have to use an JEXL or JEXL extended class. And
> there goes my Observable.
>
<snap/>
Timers don't need JEXL, you can continue using whatever EL you were
using (extend the corresponding Context and Evaluator implementations
-- if you were in fact using Commons JEXL, you'd extend JexlContext
and JexlEvaluator and so on).
> I am aware that this might be a java question instead of a SCXML question
> and if so I apologise. Maybe you can see something that I have missed or
> help me with where I should post this question. I´ve stared a bit too long
> at my code by now. Is there another way to do this?
>
<snip/>
Its a bit more of a Java question than an SCXML question, yes. You
could post to any Java forums / try search engines.
-Rahul
> best regards
> //Linda
>
>
>> >>
>> >> * Use a custom Context implementation - This will allow you to
>> >> intercept data changes, à la pointcut at
>> >> oacs.Context#set(String,Object), and get notifications that way
>> >
>> >
>> > This could possibly be of intrest, but I´m still not 100% sure on how the
>> > context works. Where would these notifications "arrive"
>> >
>> <snip/>
>>
>> This is another approach, some background:
>>
>> http://commons.apache.org/scxml/guide/contexts-evaluators.html
>>
>> I'll sketch an outline here -- say we have MyContext extending
>> SimpleContext where MyContext#set(String,Object) looks like:
>>
>> public void set(String name, Object value) {
>> // inherit behavior
>> super.set(name, value);
>> // notifications you need
>> notify(name, value);
>> }
>>
>> and a MyEvaluator extending the Evaluator you are currently using
>> whose newContext() method does this:
>>
>> public Context newContext(Context parent) {
>> return new MyContext(parent);
>> }
>>
>> then using this evaluator with the SCXMLExecutor instances like so:
>>
>> SCXMLExecutor exec = new SCXMLExecutor();
>> ...
>> exec.setEvaluator(new MyEvaluator());
>>
>> ties in the above "pointcut" behavior causing notifications for any
>> data changes within the state machine. Adjust outline per
>> requirements.
>>
>> -Rahul
>>
>>
>> > best regards
>> > //Linda
>> >
>>
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org
Re: [SCXML] getting set datats in the datamodel
Posted by Linda Erlenhov <li...@gmail.com>.
Hello
So I´m back here again.
My problem now is that I don´t know how to notify.
I looked at the solution suggested below since I thought it would be the
easiest and best looking way to implement this.
The way my first solution worked was to use Observer and Observable. Since
Observable is a class I could not extend SimpleContext aswell (since
multiple inheritance from classes is not ok in java) so i just "copied"
SimpleContext instead since it only implemented two Interfaces, extended
Observable and modifyed it according to my liking. The problem then was that
to user timers (as I was asking about in another thread) and they use JEXL.
So to make the timers work I have to use an JEXL or JEXL extended class. And
there goes my Observable.
I am aware that this might be a java question instead of a SCXML question
and if so I apologise. Maybe you can see something that I have missed or
help me with where I should post this question. I´ve stared a bit too long
at my code by now. Is there another way to do this?
best regards
//Linda
> >>
> >> * Use a custom Context implementation - This will allow you to
> >> intercept data changes, à la pointcut at
> >> oacs.Context#set(String,Object), and get notifications that way
> >
> >
> > This could possibly be of intrest, but I´m still not 100% sure on how the
> > context works. Where would these notifications "arrive"
> >
> <snip/>
>
> This is another approach, some background:
>
> http://commons.apache.org/scxml/guide/contexts-evaluators.html
>
> I'll sketch an outline here -- say we have MyContext extending
> SimpleContext where MyContext#set(String,Object) looks like:
>
> public void set(String name, Object value) {
> // inherit behavior
> super.set(name, value);
> // notifications you need
> notify(name, value);
> }
>
> and a MyEvaluator extending the Evaluator you are currently using
> whose newContext() method does this:
>
> public Context newContext(Context parent) {
> return new MyContext(parent);
> }
>
> then using this evaluator with the SCXMLExecutor instances like so:
>
> SCXMLExecutor exec = new SCXMLExecutor();
> ...
> exec.setEvaluator(new MyEvaluator());
>
> ties in the above "pointcut" behavior causing notifications for any
> data changes within the state machine. Adjust outline per
> requirements.
>
> -Rahul
>
>
> > best regards
> > //Linda
> >
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
> For additional commands, e-mail: user-help@commons.apache.org
>
>
Re: [SCXML] getting set datats in the datamodel
Posted by Rahul Akolkar <ra...@gmail.com>.
On Mon, Apr 6, 2009 at 10:35 AM, Linda Erlenhov
<li...@gmail.com> wrote:
> Hello again!
>
> I´m not sure how to explain what I want to do.
<snip/>
Code snippets like the ones below help.
> The task I have is to build
> an editor that you then can use to build simulations of applications. An
> application can be a cd-player for instance. What already exists is an
> editor for building GUI:s without coding (not build by me) and an engine
> that runs this and via a protocol "talks" to an application. What I´m trying
> to do is "attatch" my editor to the protocol instead of a "real life"
> application. The problem is that I´m developing this very generic. I can not
> know what kind of application the user want to simulate, the only thing I
> have to run this from is the protocol specification and in that
> specification it, for one thing, says that I should be able to handle
> dynamic data subscriptions.
>
> In the cd-player case this could be that a track on the cd has ended and a
> new has begun, if I have an subscription for the title of the song playing I
> would then like to send it to the engine i was talking about.
>
> So if I write a datamodel like (well, I don´t, it would be generated like
> this):
> <data name=Data>
> <Title id=1 type=String>text</Title>
> <Track id=4 type=Integer>0</Track>
> </data>
>
<snap/>
OK. What location in the SCXML document do you generate this
datamodel? I previously suggested its easiest if this appears as child
of root (you can use the stock Contexts and Evaluators):
http://markmail.org/message/bt3oli33cey7ecju
> and then somewhere in the scema the person who build the simulation wants
> "title" to change, this is then translated to:
>
> <assign location="Data.title" expr="oh yeah!" />
> as an example.
>
<snip/>
For an XML data model, its best to use the XPath Evaluator (though its
yet unreleased), where the above would look like:
<assign location="$Data/title" expr="oh yeah!" />
Or use the Data() function with other Evaluators, see this page for details:
http://commons.apache.org/scxml/guide/datamodel.html
Moreover, since you are in control of the generated markup, you could
generate a custom action to do the notifications for you. More on
custom actions here:
http://commons.apache.org/scxml/guide/custom-actions.html
So, for example, instead of generating:
<assign location="$Data/title" expr="oh yeah!" />
you could generate:
<my:assign location="$Data/title" expr="oh yeah!" />
where custom action <my:assign> inherits from standard action <assign>
to do the extra notifications bit.
> If i want to "read" what data.title:s expression is, how do I do that?
>
> I used the:
> http://www.ling.gu.se/~lager/Labs/SCXML-Lab/
> for more examples, I´m not sure if you´re using the same standard, but it´s
> an easy way to understand how the SCXML works.
>
<snap/>
Same, but the expression language in use isn't the same, the XML data
model seems to be shredded into an ECMA friendly variant. Hence the
difference in the expression above.
>>
>>
>> * Use a custom Context implementation - This will allow you to
>> intercept data changes, à la pointcut at
>> oacs.Context#set(String,Object), and get notifications that way
>
>
> This could possibly be of intrest, but I´m still not 100% sure on how the
> context works. Where would these notifications "arrive"
>
<snip/>
This is another approach, some background:
http://commons.apache.org/scxml/guide/contexts-evaluators.html
I'll sketch an outline here -- say we have MyContext extending
SimpleContext where MyContext#set(String,Object) looks like:
public void set(String name, Object value) {
// inherit behavior
super.set(name, value);
// notifications you need
notify(name, value);
}
and a MyEvaluator extending the Evaluator you are currently using
whose newContext() method does this:
public Context newContext(Context parent) {
return new MyContext(parent);
}
then using this evaluator with the SCXMLExecutor instances like so:
SCXMLExecutor exec = new SCXMLExecutor();
...
exec.setEvaluator(new MyEvaluator());
ties in the above "pointcut" behavior causing notifications for any
data changes within the state machine. Adjust outline per
requirements.
-Rahul
> best regards
> //Linda
>
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org
Re: [SCXML] getting set datats in the datamodel
Posted by Linda Erlenhov <li...@gmail.com>.
Hello again!
I´m not sure how to explain what I want to do. The task I have is to build
an editor that you then can use to build simulations of applications. An
application can be a cd-player for instance. What already exists is an
editor for building GUI:s without coding (not build by me) and an engine
that runs this and via a protocol "talks" to an application. What I´m trying
to do is "attatch" my editor to the protocol instead of a "real life"
application. The problem is that I´m developing this very generic. I can not
know what kind of application the user want to simulate, the only thing I
have to run this from is the protocol specification and in that
specification it, for one thing, says that I should be able to handle
dynamic data subscriptions.
In the cd-player case this could be that a track on the cd has ended and a
new has begun, if I have an subscription for the title of the song playing I
would then like to send it to the engine i was talking about.
So if I write a datamodel like (well, I don´t, it would be generated like
this):
<data name=Data>
<Title id=1 type=String>text</Title>
<Track id=4 type=Integer>0</Track>
</data>
and then somewhere in the scema the person who build the simulation wants
"title" to change, this is then translated to:
<assign location="Data.title" expr="oh yeah!" />
as an example.
If i want to "read" what data.title:s expression is, how do I do that?
I used the:
http://www.ling.gu.se/~lager/Labs/SCXML-Lab/
for more examples, I´m not sure if you´re using the same standard, but it´s
an easy way to understand how the SCXML works.
> This still is all quite vague to me -- for example, not clear where
> you put the data in the first place.
>
> If you want to listen to data changes, listening to state changes may
> not be the way to proceed (so I wouldn't use SCXMLListener for this
> purpose). I can think of multiple potential options:
>
> * Avoid the need for any data synchronization / subscriptions
> altogether - Back the state machine's root context with the actual
> data store
Unfortunently this is not an option because the parts that use the
subscriptions are not written by me and already exists, I just want to
"communicate" with these parts.
>
>
> * Declaratively add <transition>s guarded on specific *.change events
> - Has the benefit of capturing the associated actions in the SCXML
> document itself (use the appropriate executable content on transition)
Not sure how this would work for the user of my editor.
>
>
> * Use a custom Context implementation - This will allow you to
> intercept data changes, à la pointcut at
> oacs.Context#set(String,Object), and get notifications that way
This could possibly be of intrest, but I´m still not 100% sure on how the
context works. Where would these notifications "arrive"
best regards
//Linda
Re: [SCXML] getting set datats in the datamodel
Posted by Rahul Akolkar <ra...@gmail.com>.
For the archives, the discussion below has moved to ongoing thread
titled "[SCXML] History state".
-Rahul
On Thu, Apr 2, 2009 at 5:07 PM, Ouyang, Landon - ES/RDR -Gil
<La...@itt.com> wrote:
> I am trying to implement a history state. It does work, returns to the calling state, however it enters all the super states before getting to the calling state. Which also calls entry actions (when there are entry actions). This is not the behavior I was expecting. Can you explain to me how to prevent this?
>
> Below is the command line output from a small program that accepts trigger events and has a listener attached to the states that outputs the current state.
> [spalmisano@linuxserver src]$ run.sh
> Default scxml file is: HistoryTest.scxml
> Enter path to over-ride (or enter to continue):
> trigger>TO_STATE12
> In State12
> trigger>TO_STATE32
> In State3
> In State32
> trigger>STATE32_TO_HISTORY
> In TopState (This is what I don't want!!)
> In State1 (This is what I don't want!!)
> In State12 (This is what I do want)
> trigger>
>
>
> SCXML file used:
>
> <?xml version="1.0"?>
> <scxml xmlns="http://www.w3.org/2005/07/scxml" xmlns:my="http://www.company.com" xmlns:uml="http://schema.omg.org/spec/UML/2.1.1" xmlns:xmi="http://schema.omg.org/spec/XMI/2.1" version="1.0" initial="StateMachineInitial">
> <state id="TopState">
> <state id="State3">
> <state id="State31">
> <transition event="STATE31_TO_HISTORY" target="S1History"/>
> </state>
> <state id="State32">
> <transition event="STATE32_TO_HISTORY" target="S1History"/>
> </state>
> <initial id="State3Initial">
> <transition target="State31"/>
> </initial>
> </state>
> <initial id="TopStateInitial">
> <transition target="State1"/>
> </initial>
> <state id="State1">
> <state id="State12">
> <transition event="TO_STATE32" target="State32"/>
> <transition event="TO_STATE11" target="State11"/>
> </state>
> <state id="State11">
> <transition event="TO_STATE31" target="State31"/>
> <transition event="TO_STATE12" target="State12"/>
> </state>
> <history id="S1History" type="deep">
> <transition target="State11"/>
> </history>
> <initial id="S1Initial">
> <transition target="State11"/>
> </initial>
> </state>
> <transition event="END" target="StateMachineFinal"/>
> </state>
> <state id="StateMachineInitial">
> <transition target="TopState"/>
> </state>
> <final id="StateMachineFinal"/>
> </scxml>
>
> --
> Landon Ouyang
> Senior Design Engineer
> ITT Electronics Systems, Radar Systems - Gilfillan
> 7821 Orion Ave,
> Van Nuys, CA 91406
> (818) 901-2982
>
> This e-mail and any files transmitted with it may be proprietary and are intended solely for the use of the individual or entity to whom they are addressed. If you have received this e-mail in error please notify the sender.
> Please note that any views or opinions presented in this e-mail are solely those of the author and do not necessarily represent those of ITT Corporation. The recipient should check this e-mail and any attachments for the presence of viruses. ITT accepts no liability for any damage caused by any virus transmitted by this e-mail.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
> For additional commands, e-mail: user-help@commons.apache.org
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org
Re: [SCXML] History state
Posted by Rahul Akolkar <ra...@gmail.com>.
On Mon, Apr 6, 2009 at 4:24 PM, Ouyang, Landon - ES/RDR -Gil
<La...@itt.com> wrote:
>>> In TopState (This is what I don't want!!)
>><snip/>
>>
>>This seems off, TopState isn't part of the least common ancestor so shouldn't be entered. If you can attach a JUnit test case to JIRA, I'll have a look.
>
> This is why I asked the question. It was my understanding that the super states of State1 (TopState in this case) should not be entered and their entry actions should not be executed. I did not mean to include State1 in the list of unwanted functionality.
>
<snip/>
Yup, so State1 is expected but TopState isn't (if thats what you are seeing).
> I am new to Java and have not used JUnit yet. Can you explain what you would like to see in the JUnit test; events fired, transitions taken, state history, or something else?
>
<snap/>
There are JUnit tests buried in here:
http://svn.apache.org/repos/asf/commons/proper/scxml/trunk/src/test/java/
which you can use as examples. Generally, anything that will help us
creating a test case is welcome -- so just a complete SCXML document
with the sequence of events and expected vs. observed behavior is
enough in the report if you want to skip writing a complete JUnit
test.
-Rahul
> --
> Landon Ouyang
> Senior Design Engineer
> ITT Electronics Systems, Radar Systems - Gilfillan
> 7821 Orion Ave,
> Van Nuys, CA 91406
> (818) 901-2982
>
> -----Original Message-----
> From: Rahul Akolkar [mailto:rahul.akolkar@gmail.com]
> Sent: Thursday, April 02, 2009 6:25 PM
> To: Commons Users List
> Subject: Re: [SCXML] History state
>
> On Thu, Apr 2, 2009 at 5:43 PM, Ouyang, Landon - ES/RDR -Gil
> <La...@itt.com> wrote:
>> My apologies for not modifying the Subject header in my last e-mail (reproduced below).
>>
> <snip/>
>
> Thanks for correcting. Response below.
>
>
>> --
>> Landon Ouyang
>> Senior Design Engineer
>> ITT Electronics Systems, Radar Systems - Gilfillan
>> 7821 Orion Ave,
>> Van Nuys, CA 91406
>> (818) 901-2982
>>
>> -----Original Message-----
>> From: Ouyang, Landon - ES/RDR -Gil [mailto:Landon.Ouyang@itt.com]
>> Sent: Thursday, April 02, 2009 2:08 PM
>> To: Commons Users List
>> Subject: RE: [SCXML] getting set datats in the datamodel
>>
>> I am trying to implement a history state. It does work, returns to the calling state, however it enters all the super states before getting to the calling state. Which also calls entry actions (when there are entry actions). This is not the behavior I was expecting. Can you explain to me how to prevent this?
>>
> <snap/>
>
> In effect, transitions to histories are not much different from
> regular transitions, barring the dynamic nature of the transition
> target.
>
> The corresponding executable content (exit, transition, entry) will be
> called. If you want other behavior, you can control blocks of
> executable content using the <if> container and appropriate
> conditions. So, for example -- the first entry into the composite
> state containing the history updates some part of the datamodel, and
> latter entries guard the executable content using <if> that checks for
> the said datamodel update.
>
>
>> Below is the command line output from a small program that accepts trigger events and has a listener attached to the states that outputs the current state.
>> [spalmisano@linuxserver src]$ run.sh
>> Default scxml file is: HistoryTest.scxml
>> Enter path to over-ride (or enter to continue):
>> trigger>TO_STATE12
>> In State12
>> trigger>TO_STATE32
>> In State3
>> In State32
>> trigger>STATE32_TO_HISTORY
>> In TopState (This is what I don't want!!)
> <snip/>
>
> This seems off, TopState isn't part of the least common ancestor so
> shouldn't be entered. If you can attach a JUnit test case to JIRA,
> I'll have a look.
>
>
>> In State1 (This is what I don't want!!)
> <snap/>
>
> This is as expected. As mentioned before, you may have to guard
> executable content via application logic.
>
> -Rahul
>
>
>> In State12 (This is what I do want)
>> trigger>
>>
>>
>> SCXML file used:
>>
>> <?xml version="1.0"?>
>> <scxml xmlns="http://www.w3.org/2005/07/scxml" xmlns:my="http://www.company.com" xmlns:uml="http://schema.omg.org/spec/UML/2.1.1" xmlns:xmi="http://schema.omg.org/spec/XMI/2.1" version="1.0" initial="StateMachineInitial">
>> <state id="TopState">
>> <state id="State3">
>> <state id="State31">
>> <transition event="STATE31_TO_HISTORY" target="S1History"/>
>> </state>
>> <state id="State32">
>> <transition event="STATE32_TO_HISTORY" target="S1History"/>
>> </state>
>> <initial id="State3Initial">
>> <transition target="State31"/>
>> </initial>
>> </state>
>> <initial id="TopStateInitial">
>> <transition target="State1"/>
>> </initial>
>> <state id="State1">
>> <state id="State12">
>> <transition event="TO_STATE32" target="State32"/>
>> <transition event="TO_STATE11" target="State11"/>
>> </state>
>> <state id="State11">
>> <transition event="TO_STATE31" target="State31"/>
>> <transition event="TO_STATE12" target="State12"/>
>> </state>
>> <history id="S1History" type="deep">
>> <transition target="State11"/>
>> </history>
>> <initial id="S1Initial">
>> <transition target="State11"/>
>> </initial>
>> </state>
>> <transition event="END" target="StateMachineFinal"/>
>> </state>
>> <state id="StateMachineInitial">
>> <transition target="TopState"/>
>> </state>
>> <final id="StateMachineFinal"/>
>> </scxml>
>>
>> --
>> Landon Ouyang
>> Senior Design Engineer
>> ITT Electronics Systems, Radar Systems - Gilfillan
>> 7821 Orion Ave,
>> Van Nuys, CA 91406
>> (818) 901-2982
>>
>> This e-mail and any files transmitted with it may be proprietary and are intended solely for the use of the individual or entity to whom they are addressed. If you have received this e-mail in error please notify the sender.
>> Please note that any views or opinions presented in this e-mail are solely those of the author and do not necessarily represent those of ITT Corporation. The recipient should check this e-mail and any attachments for the presence of viruses. ITT accepts no liability for any damage caused by any virus transmitted by this e-mail.
>>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org
RE: [SCXML] History state
Posted by "Ouyang, Landon - ES/RDR -Gil" <La...@itt.com>.
>> In TopState (This is what I don't want!!)
><snip/>
>
>This seems off, TopState isn't part of the least common ancestor so shouldn't be entered. If you can attach a JUnit test case to JIRA, I'll have a look.
This is why I asked the question. It was my understanding that the super states of State1 (TopState in this case) should not be entered and their entry actions should not be executed. I did not mean to include State1 in the list of unwanted functionality.
I am new to Java and have not used JUnit yet. Can you explain what you would like to see in the JUnit test; events fired, transitions taken, state history, or something else?
--
Landon Ouyang
Senior Design Engineer
ITT Electronics Systems, Radar Systems - Gilfillan
7821 Orion Ave,
Van Nuys, CA 91406
(818) 901-2982
-----Original Message-----
From: Rahul Akolkar [mailto:rahul.akolkar@gmail.com]
Sent: Thursday, April 02, 2009 6:25 PM
To: Commons Users List
Subject: Re: [SCXML] History state
On Thu, Apr 2, 2009 at 5:43 PM, Ouyang, Landon - ES/RDR -Gil
<La...@itt.com> wrote:
> My apologies for not modifying the Subject header in my last e-mail (reproduced below).
>
<snip/>
Thanks for correcting. Response below.
> --
> Landon Ouyang
> Senior Design Engineer
> ITT Electronics Systems, Radar Systems - Gilfillan
> 7821 Orion Ave,
> Van Nuys, CA 91406
> (818) 901-2982
>
> -----Original Message-----
> From: Ouyang, Landon - ES/RDR -Gil [mailto:Landon.Ouyang@itt.com]
> Sent: Thursday, April 02, 2009 2:08 PM
> To: Commons Users List
> Subject: RE: [SCXML] getting set datats in the datamodel
>
> I am trying to implement a history state. It does work, returns to the calling state, however it enters all the super states before getting to the calling state. Which also calls entry actions (when there are entry actions). This is not the behavior I was expecting. Can you explain to me how to prevent this?
>
<snap/>
In effect, transitions to histories are not much different from
regular transitions, barring the dynamic nature of the transition
target.
The corresponding executable content (exit, transition, entry) will be
called. If you want other behavior, you can control blocks of
executable content using the <if> container and appropriate
conditions. So, for example -- the first entry into the composite
state containing the history updates some part of the datamodel, and
latter entries guard the executable content using <if> that checks for
the said datamodel update.
> Below is the command line output from a small program that accepts trigger events and has a listener attached to the states that outputs the current state.
> [spalmisano@linuxserver src]$ run.sh
> Default scxml file is: HistoryTest.scxml
> Enter path to over-ride (or enter to continue):
> trigger>TO_STATE12
> In State12
> trigger>TO_STATE32
> In State3
> In State32
> trigger>STATE32_TO_HISTORY
> In TopState (This is what I don't want!!)
<snip/>
This seems off, TopState isn't part of the least common ancestor so
shouldn't be entered. If you can attach a JUnit test case to JIRA,
I'll have a look.
> In State1 (This is what I don't want!!)
<snap/>
This is as expected. As mentioned before, you may have to guard
executable content via application logic.
-Rahul
> In State12 (This is what I do want)
> trigger>
>
>
> SCXML file used:
>
> <?xml version="1.0"?>
> <scxml xmlns="http://www.w3.org/2005/07/scxml" xmlns:my="http://www.company.com" xmlns:uml="http://schema.omg.org/spec/UML/2.1.1" xmlns:xmi="http://schema.omg.org/spec/XMI/2.1" version="1.0" initial="StateMachineInitial">
> <state id="TopState">
> <state id="State3">
> <state id="State31">
> <transition event="STATE31_TO_HISTORY" target="S1History"/>
> </state>
> <state id="State32">
> <transition event="STATE32_TO_HISTORY" target="S1History"/>
> </state>
> <initial id="State3Initial">
> <transition target="State31"/>
> </initial>
> </state>
> <initial id="TopStateInitial">
> <transition target="State1"/>
> </initial>
> <state id="State1">
> <state id="State12">
> <transition event="TO_STATE32" target="State32"/>
> <transition event="TO_STATE11" target="State11"/>
> </state>
> <state id="State11">
> <transition event="TO_STATE31" target="State31"/>
> <transition event="TO_STATE12" target="State12"/>
> </state>
> <history id="S1History" type="deep">
> <transition target="State11"/>
> </history>
> <initial id="S1Initial">
> <transition target="State11"/>
> </initial>
> </state>
> <transition event="END" target="StateMachineFinal"/>
> </state>
> <state id="StateMachineInitial">
> <transition target="TopState"/>
> </state>
> <final id="StateMachineFinal"/>
> </scxml>
>
> --
> Landon Ouyang
> Senior Design Engineer
> ITT Electronics Systems, Radar Systems - Gilfillan
> 7821 Orion Ave,
> Van Nuys, CA 91406
> (818) 901-2982
>
> This e-mail and any files transmitted with it may be proprietary and are intended solely for the use of the individual or entity to whom they are addressed. If you have received this e-mail in error please notify the sender.
> Please note that any views or opinions presented in this e-mail are solely those of the author and do not necessarily represent those of ITT Corporation. The recipient should check this e-mail and any attachments for the presence of viruses. ITT accepts no liability for any damage caused by any virus transmitted by this e-mail.
>
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org
Re: [SCXML] History state
Posted by Rahul Akolkar <ra...@gmail.com>.
On Thu, Apr 2, 2009 at 5:43 PM, Ouyang, Landon - ES/RDR -Gil
<La...@itt.com> wrote:
> My apologies for not modifying the Subject header in my last e-mail (reproduced below).
>
<snip/>
Thanks for correcting. Response below.
> --
> Landon Ouyang
> Senior Design Engineer
> ITT Electronics Systems, Radar Systems - Gilfillan
> 7821 Orion Ave,
> Van Nuys, CA 91406
> (818) 901-2982
>
> -----Original Message-----
> From: Ouyang, Landon - ES/RDR -Gil [mailto:Landon.Ouyang@itt.com]
> Sent: Thursday, April 02, 2009 2:08 PM
> To: Commons Users List
> Subject: RE: [SCXML] getting set datats in the datamodel
>
> I am trying to implement a history state. It does work, returns to the calling state, however it enters all the super states before getting to the calling state. Which also calls entry actions (when there are entry actions). This is not the behavior I was expecting. Can you explain to me how to prevent this?
>
<snap/>
In effect, transitions to histories are not much different from
regular transitions, barring the dynamic nature of the transition
target.
The corresponding executable content (exit, transition, entry) will be
called. If you want other behavior, you can control blocks of
executable content using the <if> container and appropriate
conditions. So, for example -- the first entry into the composite
state containing the history updates some part of the datamodel, and
latter entries guard the executable content using <if> that checks for
the said datamodel update.
> Below is the command line output from a small program that accepts trigger events and has a listener attached to the states that outputs the current state.
> [spalmisano@linuxserver src]$ run.sh
> Default scxml file is: HistoryTest.scxml
> Enter path to over-ride (or enter to continue):
> trigger>TO_STATE12
> In State12
> trigger>TO_STATE32
> In State3
> In State32
> trigger>STATE32_TO_HISTORY
> In TopState (This is what I don't want!!)
<snip/>
This seems off, TopState isn't part of the least common ancestor so
shouldn't be entered. If you can attach a JUnit test case to JIRA,
I'll have a look.
> In State1 (This is what I don't want!!)
<snap/>
This is as expected. As mentioned before, you may have to guard
executable content via application logic.
-Rahul
> In State12 (This is what I do want)
> trigger>
>
>
> SCXML file used:
>
> <?xml version="1.0"?>
> <scxml xmlns="http://www.w3.org/2005/07/scxml" xmlns:my="http://www.company.com" xmlns:uml="http://schema.omg.org/spec/UML/2.1.1" xmlns:xmi="http://schema.omg.org/spec/XMI/2.1" version="1.0" initial="StateMachineInitial">
> <state id="TopState">
> <state id="State3">
> <state id="State31">
> <transition event="STATE31_TO_HISTORY" target="S1History"/>
> </state>
> <state id="State32">
> <transition event="STATE32_TO_HISTORY" target="S1History"/>
> </state>
> <initial id="State3Initial">
> <transition target="State31"/>
> </initial>
> </state>
> <initial id="TopStateInitial">
> <transition target="State1"/>
> </initial>
> <state id="State1">
> <state id="State12">
> <transition event="TO_STATE32" target="State32"/>
> <transition event="TO_STATE11" target="State11"/>
> </state>
> <state id="State11">
> <transition event="TO_STATE31" target="State31"/>
> <transition event="TO_STATE12" target="State12"/>
> </state>
> <history id="S1History" type="deep">
> <transition target="State11"/>
> </history>
> <initial id="S1Initial">
> <transition target="State11"/>
> </initial>
> </state>
> <transition event="END" target="StateMachineFinal"/>
> </state>
> <state id="StateMachineInitial">
> <transition target="TopState"/>
> </state>
> <final id="StateMachineFinal"/>
> </scxml>
>
> --
> Landon Ouyang
> Senior Design Engineer
> ITT Electronics Systems, Radar Systems - Gilfillan
> 7821 Orion Ave,
> Van Nuys, CA 91406
> (818) 901-2982
>
> This e-mail and any files transmitted with it may be proprietary and are intended solely for the use of the individual or entity to whom they are addressed. If you have received this e-mail in error please notify the sender.
> Please note that any views or opinions presented in this e-mail are solely those of the author and do not necessarily represent those of ITT Corporation. The recipient should check this e-mail and any attachments for the presence of viruses. ITT accepts no liability for any damage caused by any virus transmitted by this e-mail.
>
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org
[SCXML] History state
Posted by "Ouyang, Landon - ES/RDR -Gil" <La...@itt.com>.
My apologies for not modifying the Subject header in my last e-mail (reproduced below).
--
Landon Ouyang
Senior Design Engineer
ITT Electronics Systems, Radar Systems - Gilfillan
7821 Orion Ave,
Van Nuys, CA 91406
(818) 901-2982
-----Original Message-----
From: Ouyang, Landon - ES/RDR -Gil [mailto:Landon.Ouyang@itt.com]
Sent: Thursday, April 02, 2009 2:08 PM
To: Commons Users List
Subject: RE: [SCXML] getting set datats in the datamodel
I am trying to implement a history state. It does work, returns to the calling state, however it enters all the super states before getting to the calling state. Which also calls entry actions (when there are entry actions). This is not the behavior I was expecting. Can you explain to me how to prevent this?
Below is the command line output from a small program that accepts trigger events and has a listener attached to the states that outputs the current state.
[spalmisano@linuxserver src]$ run.sh
Default scxml file is: HistoryTest.scxml
Enter path to over-ride (or enter to continue):
trigger>TO_STATE12
In State12
trigger>TO_STATE32
In State3
In State32
trigger>STATE32_TO_HISTORY
In TopState (This is what I don't want!!)
In State1 (This is what I don't want!!)
In State12 (This is what I do want)
trigger>
SCXML file used:
<?xml version="1.0"?>
<scxml xmlns="http://www.w3.org/2005/07/scxml" xmlns:my="http://www.company.com" xmlns:uml="http://schema.omg.org/spec/UML/2.1.1" xmlns:xmi="http://schema.omg.org/spec/XMI/2.1" version="1.0" initial="StateMachineInitial">
<state id="TopState">
<state id="State3">
<state id="State31">
<transition event="STATE31_TO_HISTORY" target="S1History"/>
</state>
<state id="State32">
<transition event="STATE32_TO_HISTORY" target="S1History"/>
</state>
<initial id="State3Initial">
<transition target="State31"/>
</initial>
</state>
<initial id="TopStateInitial">
<transition target="State1"/>
</initial>
<state id="State1">
<state id="State12">
<transition event="TO_STATE32" target="State32"/>
<transition event="TO_STATE11" target="State11"/>
</state>
<state id="State11">
<transition event="TO_STATE31" target="State31"/>
<transition event="TO_STATE12" target="State12"/>
</state>
<history id="S1History" type="deep">
<transition target="State11"/>
</history>
<initial id="S1Initial">
<transition target="State11"/>
</initial>
</state>
<transition event="END" target="StateMachineFinal"/>
</state>
<state id="StateMachineInitial">
<transition target="TopState"/>
</state>
<final id="StateMachineFinal"/>
</scxml>
--
Landon Ouyang
Senior Design Engineer
ITT Electronics Systems, Radar Systems - Gilfillan
7821 Orion Ave,
Van Nuys, CA 91406
(818) 901-2982
This e-mail and any files transmitted with it may be proprietary and are intended solely for the use of the individual or entity to whom they are addressed. If you have received this e-mail in error please notify the sender.
Please note that any views or opinions presented in this e-mail are solely those of the author and do not necessarily represent those of ITT Corporation. The recipient should check this e-mail and any attachments for the presence of viruses. ITT accepts no liability for any damage caused by any virus transmitted by this e-mail.
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org
RE: [SCXML] getting set datats in the datamodel
Posted by "Ouyang, Landon - ES/RDR -Gil" <La...@itt.com>.
I am trying to implement a history state. It does work, returns to the calling state, however it enters all the super states before getting to the calling state. Which also calls entry actions (when there are entry actions). This is not the behavior I was expecting. Can you explain to me how to prevent this?
Below is the command line output from a small program that accepts trigger events and has a listener attached to the states that outputs the current state.
[spalmisano@linuxserver src]$ run.sh
Default scxml file is: HistoryTest.scxml
Enter path to over-ride (or enter to continue):
trigger>TO_STATE12
In State12
trigger>TO_STATE32
In State3
In State32
trigger>STATE32_TO_HISTORY
In TopState (This is what I don't want!!)
In State1 (This is what I don't want!!)
In State12 (This is what I do want)
trigger>
SCXML file used:
<?xml version="1.0"?>
<scxml xmlns="http://www.w3.org/2005/07/scxml" xmlns:my="http://www.company.com" xmlns:uml="http://schema.omg.org/spec/UML/2.1.1" xmlns:xmi="http://schema.omg.org/spec/XMI/2.1" version="1.0" initial="StateMachineInitial">
<state id="TopState">
<state id="State3">
<state id="State31">
<transition event="STATE31_TO_HISTORY" target="S1History"/>
</state>
<state id="State32">
<transition event="STATE32_TO_HISTORY" target="S1History"/>
</state>
<initial id="State3Initial">
<transition target="State31"/>
</initial>
</state>
<initial id="TopStateInitial">
<transition target="State1"/>
</initial>
<state id="State1">
<state id="State12">
<transition event="TO_STATE32" target="State32"/>
<transition event="TO_STATE11" target="State11"/>
</state>
<state id="State11">
<transition event="TO_STATE31" target="State31"/>
<transition event="TO_STATE12" target="State12"/>
</state>
<history id="S1History" type="deep">
<transition target="State11"/>
</history>
<initial id="S1Initial">
<transition target="State11"/>
</initial>
</state>
<transition event="END" target="StateMachineFinal"/>
</state>
<state id="StateMachineInitial">
<transition target="TopState"/>
</state>
<final id="StateMachineFinal"/>
</scxml>
--
Landon Ouyang
Senior Design Engineer
ITT Electronics Systems, Radar Systems - Gilfillan
7821 Orion Ave,
Van Nuys, CA 91406
(818) 901-2982
This e-mail and any files transmitted with it may be proprietary and are intended solely for the use of the individual or entity to whom they are addressed. If you have received this e-mail in error please notify the sender.
Please note that any views or opinions presented in this e-mail are solely those of the author and do not necessarily represent those of ITT Corporation. The recipient should check this e-mail and any attachments for the presence of viruses. ITT accepts no liability for any damage caused by any virus transmitted by this e-mail.
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org
Re: [SCXML] getting set datats in the datamodel
Posted by Rahul Akolkar <ra...@gmail.com>.
On Tue, Mar 31, 2009 at 7:46 AM, Linda Erlenhov
<li...@gmail.com> wrote:
> Hello again!
>
> I have a problem with my datamodel. Or rather the fetching of datas that are
> used in the datamodel.
> I have my editor for building statemachines graphical, this is then
> "translated" into a corresponding SCXML document that then is run "normally"
> with Apache commons. The person that uses the editor shoul amongst other
> things be able select if she/he has want´s some data to be set (integers or
> strings) when entering states.
> The GUI that communicates with the machine does this via an interface wich
> is the thing I´m writing now. The GUI can send subscriptions requests for
> data wich basically means that it wants to subscribe certain data and wants
> the interface to send it when the data is changed.
> How I solved the part of saving checking the data is somewhat irrelevant,
> the problem is when I want to fetch the data that is saved. Since the model
> doesn´t "tell" when data has changed I check whenever entering a state
> (onEntry Listner) but where do I check this.
> Where is this, the data, saved?
>
<snip/>
This still is all quite vague to me -- for example, not clear where
you put the data in the first place.
If you want to listen to data changes, listening to state changes may
not be the way to proceed (so I wouldn't use SCXMLListener for this
purpose). I can think of multiple potential options:
* Avoid the need for any data synchronization / subscriptions
altogether - Back the state machine's root context with the actual
data store
* Declaratively add <transition>s guarded on specific *.change events
- Has the benefit of capturing the associated actions in the SCXML
document itself (use the appropriate executable content on transition)
* Use a custom Context implementation - This will allow you to
intercept data changes, à la pointcut at
oacs.Context#set(String,Object), and get notifications that way
-Rahul
> best regards
> //Linda
>
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org