Re: [SCXML] Polling in datamodel
Hello!
The thing here is that the value is never a DOM node. Hence my question. I
previousley asked why the assign location didn´t call for the set
function in the Context and got the answere that the assign location
doesn´t work as assign name, assign name calls the set function and sets
a variable, assign location manipulates the XML tree as it is. The advice
was to make an custom action instead or do the ugly hack I did: do an
assign name with the name after the assign location has executed.
What I wanted to know is if there is any way of fetching the tree or
whatever it is to get the data associatet to a name, according to the model
below.
If you look at my example below, I will always know the name of the
datamodel in this case: DynamicData, and I will recieve the name of the
specific tag in this data, in this case Data_1, Data_2 or Data_3. In
my model below I have done an ugly way of finding out what the value is but
i realized that that was not enough, i need to know the type aswell. And
that I don´t know how to find.
Does anybody have a solution to this, or some kind of idea on how to solve
this?
best regards
//Linda
On Tue, May 5, 2009 at 3:50 PM, Ingmar Kliche
ingmar.kli...@googlemail.comwrote:
Linda,
you should be able to use the DOM API to read the values. In
context.set(name, value) you should check whether the value is a DOM node:
import import org.w3c.dom.Node;
...
... set(String name, Object value) {
if (value instanceof Node) {
Node nodeValue = (Node) value;
}
scope.put(name, scope, value);
2009/5/5 Linda Erlenhov linda.erlen...@gmail.com
Hello.
I´m back with another thousand questions!
Still with my datamodel like this:
scxml version=1.0 initialstate=176 xmlns:cs=
http://commons.apache.org/scxml; xmlns=http://www.w3.org/2005/07/scxml
datamodel
data name=DynamicData
Data_1 xmlns= id=1 type=Integer0/Data_1
Data_2 xmlns= id=2 type=Integer0/Data_2
Data_3 xmlns= id=3 type=Stringnone/Data_2
/data
data name=DDChange/
data name=DDValue/
data name=DDType/
data name=Indication_1 expr=false/
/datamodel
...snip...
Later on i set the data:
...snip.
state id=StateB
onentry
log label=Renegade expr='Entering state: StateB'/
log label=Renegade expr=Data(DynamicData,'Data_1')/
assign location=Data(DynamicData,'Data_1')
expr=Data(DynamicData,'Data_1')+1/
assign name=DDValue expr=Data(DynamicData,'Data_1')/
assign name=DDChange expr='Data_1'/
log label=Renegade expr=Data(DynamicData,'Data_1')/
/onentry
..snip
So now here´s the problem.
As you see I haven´t used the custom action, but an rather ugly hack
where
I
do an assign name after I do the assign location to trigger a call to the
set function in the context.
In this version I also do another assign where I assign another name with
the value. All my data are named Data_XX so i screen the calls to set byt
looking for the ones that are named Data_XX. When I recieve a call for
Data_XX I would like to know what the value is, which I in this case have
solved by assigning another variable with it earlier, when i get a set
call named Data_xx i know that the variable DDValue contains the value of
this data. Not pretty, but OK and working so far.
Now I would like to be able to see what type the data is aswell. How do
I
do that? And: Is there a less spaghetti way to poll the value of the data
from where I am (In the context) when I have the name of it. (The name
in
this case is Data_1, Data_2 or Data_3, I also know that the data=name is
DynamicData) .
Due to lack of time I would prefer if i wouldn´t have to redo to much
of
the scxml, but is this possible to do it my way otherwise? Or do I have
to
do it over.
Best Regards
//Linda
[SCXML] Polling in datamodel
Hello. I´m back with another thousand questions! Still with my datamodel like this: scxml version=1.0 initialstate=176 xmlns:cs= http://commons.apache.org/scxml; xmlns=http://www.w3.org/2005/07/scxml; datamodel data name=DynamicData Data_1 xmlns= id=1 type=Integer0/Data_1 Data_2 xmlns= id=2 type=Integer0/Data_2 Data_3 xmlns= id=3 type=Stringnone/Data_2 /data data name=DDChange/ data name=DDValue/ data name=DDType/ data name=Indication_1 expr=false/ /datamodel ...snip... Later on i set the data: ...snip. state id=StateB onentry log label=Renegade expr='Entering state: StateB'/ log label=Renegade expr=Data(DynamicData,'Data_1')/ assign location=Data(DynamicData,'Data_1') expr=Data(DynamicData,'Data_1')+1/ assign name=DDValue expr=Data(DynamicData,'Data_1')/ assign name=DDChange expr='Data_1'/ log label=Renegade expr=Data(DynamicData,'Data_1')/ /onentry ..snip So now here´s the problem. As you see I haven´t used the custom action, but an rather ugly hack where I do an assign name after I do the assign location to trigger a call to the set function in the context. In this version I also do another assign where I assign another name with the value. All my data are named Data_XX so i screen the calls to set byt looking for the ones that are named Data_XX. When I recieve a call for Data_XX I would like to know what the value is, which I in this case have solved by assigning another variable with it earlier, when i get a set call named Data_xx i know that the variable DDValue contains the value of this data. Not pretty, but OK and working so far. Now I would like to be able to see what type the data is aswell. How do I do that? And: Is there a less spaghetti way to poll the value of the data from where I am (In the context) when I have the name of it. (The name in this case is Data_1, Data_2 or Data_3, I also know that the data=name is DynamicData) . Due to lack of time I would prefer if i wouldn´t have to redo to much of the scxml, but is this possible to do it my way otherwise? Or do I have to do it over. Best Regards //Linda
Re: [SCXML] getting set datats in the datamodel
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
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=Integer0/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] Timers in SCXML
Hello again. I run the standalone test and it looks like the timers work fine there (An infinit loop between the two states, the logs, except for those that was nested as you pointed out, are printed one or two seconds apart as specified in the scxml ), so now I´m a bit clueless with how to proceed, any idéas? Is there anything I might have forgotten in my java files since it doesn´t work there? best regards //Linda On Tue, Apr 14, 2009 at 9:11 PM, Rahul Akolkar rahul.akol...@gmail.comwrote: On Tue, Apr 14, 2009 at 8:19 AM, Linda Erlenhov linda.erlen...@gmail.com wrote: Hello! This may be a stupid question but: I have read through the code for the simple scheduler and I´m not sure i understand what happens. We have written a simple scxml for a small statechart containing two states with timers and used the simple scheduler as described in your previous e-mail. As I understand the timers would make the machine just jump between the two states. This doesn´t happen. Why? snip/ The Commons SCXML version and the relevant driver (Java) code will help towards answering -- we know this works, so we'll need to know whats being done differently. Bear in mind that the timers execute as daemons. I suggest trying your example standalone [1] first, and we'll go from there. As an aside, in the markup below, log is nested in send which isn't legal, so the nested log will be ignored. -Rahul [1] http://commons.apache.org/scxml/guide/testing-standalone.html --- scxml version=1.0 initialstate=167 xmlns:cs= http://commons.apache.org/scxml; xmlns=http://www.w3.org/2005/07/scxml state id = 167 transition target=StateA/ /state state id =StateA onentry log label=Renegade expr='Entering state: A'/ send sendid=1 event='ToB' delay='1000ms' log label=Renegade expr='Timer starting...'/ /send /onentry transition event=ToB target=StateB/ /state state id=StateB onentry log label=Renegade expr='Entering state: B'/ send sendid=2 event='ToA' delay='2000ms' log label=Renegade expr='Timer starting...'/ /send /onentry transition event=ToA target=StateA/ /state /scxml - The output when this is run is simply: 2009-apr-14 13:08:57 org.apache.commons.scxml.model.Log execute INFO: Renegade: Entering state: A 2009-apr-14 13:08:57 org.apache.commons.scxml.env.SimpleScheduler send INFO: send ( sendId: 1, target: null, targetType: scxml, event: ToB, params: null, hints: null, delay: 1000) best regards //Linda - To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
Re: [SCXML] Timers in SCXML
Hello! This may be a stupid question but: I have read through the code for the simple scheduler and I´m not sure i understand what happens. We have written a simple scxml for a small statechart containing two states with timers and used the simple scheduler as described in your previous e-mail. As I understand the timers would make the machine just jump between the two states. This doesn´t happen. Why? --- scxml version=1.0 initialstate=167 xmlns:cs= http://commons.apache.org/scxml; xmlns=http://www.w3.org/2005/07/scxml; state id = 167 transition target=StateA/ /state state id =StateA onentry log label=Renegade expr='Entering state: A'/ send sendid=1 event='ToB' delay='1000ms' log label=Renegade expr='Timer starting...'/ /send /onentry transition event=ToB target=StateB/ /state state id=StateB onentry log label=Renegade expr='Entering state: B'/ send sendid=2 event='ToA' delay='2000ms' log label=Renegade expr='Timer starting...'/ /send /onentry transition event=ToA target=StateA/ /state /scxml - The output when this is run is simply: 2009-apr-14 13:08:57 org.apache.commons.scxml.model.Log execute INFO: Renegade: Entering state: A 2009-apr-14 13:08:57 org.apache.commons.scxml.env.SimpleScheduler send INFO: send ( sendId: 1, target: null, targetType: scxml, event: ToB, params: null, hints: null, delay: 1000) best regards //Linda
Re: [SCXML] getting set datats in the datamodel
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 armel.soro.sc...@gmail.comwrote: 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 linda.erlen...@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
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=Stringtext/Title Track id=4 type=Integer0/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 transitions 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
[SCXML] getting a state id.
Hello I´m back with sort of the same (but then again not) problem as I´ve asked previousley. It´s about fetching ID:s again. I have an SCXML file that looks on the form like this: ?xml version=1.0 encoding=ISO-8859-1? scxml id=runsim state id=176 initial transition event=1 cond=!1 target=0 var name=1/ /transition /initial state id=0 transition event=2 cond=2 target=END/ transition event=3 cond=!1 target=2 var name=1/ /transition /state final id=END/ /state /scxml I would like to fetch the first states id, the one that wrapps everything (in this version the id is 176). How do I do that? Best Regards Linda
[SCXML] more Evaluator/Context questions
Hello! This is my plan: My guards are boolean expressions and the boolean variables that the expression consists of are updated in onEntry/onExit. I use a listner for _when_ the update should be done. The trouble is that I´m not shure _where/how_ the updating is done. Since this should be done during runtime a guess is that it is some kind of update in the context, but I have clearly not understood properly how this (context) works. So if I create a simple example then maybe someone could use it to explain this to me: The statemachine has three states. A, B and C. There are transitions between A B both ways, and also transitions between B C both ways. You can trigger events that are go to A, go to B go to C. You start in A. On the transition from B to A there is a guard for been in C that is set when you visit C. So you have to visit C atleast once before you enter state A the second time. A=B=C How/where do I set the been in C state to true when i enter the state? Best Regards //Linda
[SCXML] Transition/Var question
Hello
I have in my Transitions added var on the form:
transition cond=${cancelOutcome eq 'success'} target=editExit
varname=outcome
expr=cancel/
/transition
(This example is taken directly from the SCXML specification)
In my statemachine (a version similar, but not derived from the
AbstractStateMachine that is included) I have added an onTransition
function in my listner that when I am on a transition should check if there
is an var and in that case send it to .
I´m having trouble fetching the var. My thought is that that I should
derive a new class from the transition class that includes the method
getVar but I´ve looked through the API and I don´t understand how this
method should be written. Can anybody help me?
Best Regards
/Linda
Re: [SCXML] Transition/Var question
Hello again! snip followed by introspection like so: getEngine().getRootContext().get(outcome); /snip The problem with that approach is that i won´t know the names of my var:s. The idéa is: I´m building an graphical editor for Statecharts, where you can model a statemachine with some simple drag and drop actions. When your satisfied with your machine the editor generates an SCXML-file which then is meant to be run. Everything I do has to be generic so what I wanted was a way to, when the listner registers an onTransition ( the class Implements the SCXMLListener interface) move: 1. Check if there is an var associated with that transition 2. If so, fetch the exp. best regards //Linda
Re: [SCXML] Executor Questions
Hello again. Doesn´t anybody have a solution to my problem? I don´t know if maybe theres something I need to clarify. The engine sends messages that are java objects that I in the (?) part translates to somethin on the form that the ApacheEngine wants. What I don´t understand is what I should do with the context and evauator in my model, can I work around it somehow? best regards //Linda On Tue, Feb 17, 2009 at 1:52 PM, Linda Erlenhov linda.erlen...@gmail.comwrote: Hello I have just begun using the Apache SCXML and I have encountered a problem. This is what already is: I have an editor for HMI. You build the interfaces using modules and then connects to actions and events in a databas and this is then run by another engine that sends events/actions (for some strange reasond they are named the wrong way in this program, i didn´t build it so...) to a CD player or whatever through a protocol via an interface. My job: is to build a simulator for the cd-player part. The tricky is that it should be generic, so that the client can build whatever kind of machine he or she wants to. I have created a graphical interface with GMF in eclipse where you can build statemachines with the help of modules representing states, transitions etc. This generates a XML representation of the statemachine once it´s finished and then that is translated into SCXML. So far so good. so what we have here now is HMIeditor - DB - Engine - protocol - (??) - Apache engine-SCXML-XML - my editor for statecharts. All the functions (actions, events etc.) of the cd-player is described in a XML file wich both the HMI editor and my editor uses so I can put them on any form I want to and I have knowledge in what the HMIeditorengine does to the data. This is what I think is the problem (above shown as (??)): Between the apache engine and the protocol ther should be an interface (duh). My interface there should start up both engines and then (i think) listen to two buffers (i´m thinking two threads), my interface takes care of the translation from the protocol data look to the ApacheEngines data look. I just don´t undstand now how I should start up the Apache engine. I don't understand what i need the context and evaluator and so on for, the things that the apache engine recieves should be on the form it wants? Or have I just misunderstood? I hope someone understands something of what my problem is. best regards //Linda
