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From Martin Gainty <mgai...@hotmail.com>
Subject RE: [scxml] templating/src/xinclude and returning a value(through datamodel/donedata)
Date Thu, 06 May 2010 18:18:42 GMT

Fabrizio-

from what ive read in the scxml doc you need to configure the datamodel and their respective
data node children directly under the scm root node e.g.
<scxml xmlns="http://www.w3.org/2005/07/scxml"
               version="1.0"
               initialstate="init-travel-plan">

      <datamodel>
        <data name="airlineticket">
//you can use the Data macro to reference the current value of the requested parameters e.g.
//Commons SCXML defines a Data()
   function for use in JEXL or EL expressions, for example:
    <var name="arrival" expr="Data(hotelbooking, 'hotel/stay/arrival')" />

//   The above expression extracts the arrival date from the hotelbooking
//   data in the documents datamodel and stores it in a scratch space variable
//   named "arrival". The first argument is value of the name attribute of the
//   <data> element and the second is the String value of the XPath
//   expression. If more than one matching nodes are found, the first one
//   is returned.   //this is different from your current implementation which uses data elements
associated with a state e.g.
     <scxml xmlns="http://www.w3.org/2005/07/scxml"
               version="1.0"
               initialstate="airline-ticket">

      <state id="airline-ticket">
        <datamodel>
          <data...>
the association of this data would be to airline-ticket and could not be used in hotel or
restaurant
a complete scxml tutorial is available at
http://commons.apache.org/scxml/guide/datamodel.html

HTH
Martin Gainty 
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> From: fmorbini@gmail.com
> Date: Thu, 6 May 2010 10:24:17 -0700
> Subject: Re: [scxml] templating/src/xinclude and returning a value(through 	datamodel/donedata)
> To: user@commons.apache.org
> 
> Hi Rahul, thanks for the quick reply. i opened the JIRA ticket for the
> donedata as you suggested.
> But i still cannot get this to work even with your suggested
> modifications. Here is the log of execution (it seems that the
> assignment to AAA doesn't persist).
> 
> DEBUG 10:14:22.086 [Thread-1       ] [sax                      ] endDocument()
> DEBUG 10:14:23.103 [Thread-1       ] [Context                  ]
> _ALL_NAMESPACES = {=http://www.w3.org/2005/07/scxml,
> cs=http://commons.apache.org/scxml}
> DEBUG 10:14:23.129 [Thread-1       ] [ExpressionFactory        ]
> Parsing expression: 10;
> DEBUG 10:14:23.131 [Thread-1       ] [Context                  ]
> _ALL_NAMESPACES = null
> DEBUG 10:14:23.131 [Thread-1       ] [Context                  ] cook_time = 10
> DEBUG 10:14:23.131 [Thread-1       ] [Context                  ] AAA =
> [data: null]
> DEBUG 10:14:23.132 [Thread-1       ] [Context                  ]
> _eventdata = null
> DEBUG 10:14:23.132 [Thread-1       ] [Context                  ]
> _eventdatamap = {s1.entry=null}
> DEBUG 10:14:23.132 [Thread-1       ] [Context                  ]
> _eventdata = null
> DEBUG 10:14:23.132 [Thread-1       ] [Context                  ]
> _eventdatamap = {s11.entry=null, s1.exit=null, s2.entry=null}
> DEBUG 10:14:23.132 [Thread-1       ] [Context                  ]
> _ALL_NAMESPACES = {=http://www.w3.org/2005/07/scxml,
> cs=http://commons.apache.org/scxml}
> DEBUG 10:14:23.133 [Thread-1       ] [ExpressionFactory        ]
> Parsing expression: AAA;
> DEBUG 10:14:23.133 [Thread-1       ] [ExpressionFactory        ]
> Parsing expression: 's3';
> DEBUG 10:14:23.134 [Thread-1       ] [ExpressionFactory        ]
> Parsing expression: 's3';
> DEBUG 10:14:23.134 [Thread-1       ] [SCXMLSemantics           ]
> <assign>: data node 'data' updated
> DEBUG 10:14:23.134 [Thread-1       ] [Context                  ]
> _ALL_NAMESPACES = null
> DEBUG 10:14:23.134 [Thread-1       ] [Context                  ]
> _eventdata = null
> DEBUG 10:14:23.134 [Thread-1       ] [Context                  ]
> _eventdatamap = {s11.exit=null, s12.entry=null, null.change=null,
> s2.done=null}
> DEBUG 10:14:23.134 [Thread-1       ] [Context                  ]
> _ALL_NAMESPACES = {=http://www.w3.org/2005/07/scxml,
> cs=http://commons.apache.org/scxml}
> DEBUG 10:14:23.134 [Thread-1       ] [ExpressionFactory        ]
> Parsing expression: AAA eq 's3';
> DEBUG 10:14:23.134 [Thread-1       ] [Context                  ]
> _ALL_NAMESPACES = null
> DEBUG 10:14:23.135 [Thread-1       ] [Context                  ]
> _ALL_NAMESPACES = {=http://www.w3.org/2005/07/scxml,
> cs=http://commons.apache.org/scxml}
> DEBUG 10:14:23.135 [Thread-1       ] [ExpressionFactory        ]
> Parsing expression: AAA eq 's4';
> DEBUG 10:14:23.135 [Thread-1       ] [Context                  ]
> _ALL_NAMESPACES = null
> DEBUG 10:14:23.135 [Thread-1       ] [Context                  ]
> _ALL_NAMESPACES = {=http://www.w3.org/2005/07/scxml,
> cs=http://commons.apache.org/scxml}
> DEBUG 10:14:23.135 [Thread-1       ] [ExpressionFactory        ]
> Parsing expression: AAA;
> INFO  10:14:23.135 [Thread-1       ] [SCXMLSemantics           ] null:
> [data: null]
> DEBUG 10:14:23.135 [Thread-1       ] [Context                  ]
> _ALL_NAMESPACES = null
> DEBUG 10:14:23.135 [Thread-1       ] [Context                  ]
> _eventdata = null
> DEBUG 10:14:23.135 [Thread-1       ] [Context                  ]
> _eventdatamap = {s2.exit=null, s12.exit=null, s5.entry=null,
> .done=null}
> DEBUG 10:14:23.135 [Thread-1       ] [Context                  ]
> _eventdata = null
> DEBUG 10:14:23.135 [Thread-1       ] [Context                  ]
> _eventdatamap = {s1.entry=null}
> DEBUG 10:14:23.135 [Thread-1       ] [SCXMLExecutor            ]
> Current States: [s5]
> 
> here are the modified files:
> =============file a.scxml=====================================
> <?xml version="1.0"?>
> <scxml xmlns="http://www.w3.org/2005/07/scxml"
> 		xmlns:cs="http://commons.apache.org/scxml"
>        version="1.0"
>        profile="ecmascript"
>        initial="s1">
> 
>   <!--  trivial 5 second microwave oven example -->
>   <!--  see http://commons.apache.org/scxml/guide/datamodel.html for
> different way to access the datamodel -->
>   <datamodel>
>     <data id="cook_time" expr="10"/>
> 	 <data id="AAA" expr="''"/>
>   </datamodel>
> 
>   <state id="s1">
>     <!-- off state -->
>     <transition target="s2"/>
>   </state>
> 
>   <state id="s2" src="b.scxml#s111">
> 
>     <!-- on/pause state -->
> 	
>     <transition event="s2.done" cond="AAA eq 's3'" target="s3"/>
>     <transition event="s2.done" cond="AAA eq 's4'" target="s4"/>
>     <transition event="s2.done" target="s5"/>
> 	<onexit>
> 		<log expr="AAA"/>
> 	</onexit>
>   </state>
> 
>     <final id="s3"/>
>     <final id="s4"/>
>     <final id="s5"/>
> </scxml>
> =============end of file a.scxml==============================
> 
> =============file b.scxml=====================================
> <?xml version="1.0" encoding="us-ascii"?>
> <scxml version="1.0" xmlns="http://www.w3.org/2005/07/scxml"
> xmlns:cs="http://commons.apache.org/scxml" initial="s111">
> 	<state id="s111">
> 	<initial><transition target="s11"/></initial>
> 
>     <state id="s11">
> 		<transition target="s12">
> 				<!--<cs:var name="aaa" expr="'s3'" />-->
> 				<assign location="AAA" expr="'s3'"/>
> 		</transition>
>     </state>
> 
> 	<final id="s12">
> 	</final>
> 	</state>
> </scxml>
> =============end of file b.scxml==============================
> 
> thanks,
> fabrizio.
> 
> On Thu, May 6, 2010 at 09:52, Rahul Akolkar <rahul.akolkar@gmail.com> wrote:
> > On Thu, May 6, 2010 at 11:34 AM, Fabrizio Morbini <fmorbini@gmail.com> wrote:
> >> Hi, i'm experimenting with the src attribute to reuse fsm. I'm having
> >> some trouble with returning a value from an included fsm to the
> >> calling state.
> >>
> >> I'm using this description at
> >> http://shale.apache.org/shale-dialog-scxml/index.html, in particular
> >> the section about subdialogs from which it seems possible to return a
> >> value from an included scxml fsm.
> >> However i have been unable to do so. I've tried several variants but
> >> none with the expected outcome.
> > <snip/>
> >
> > The Commons SCXML v0.9 release does not use a flat / global datamodel
> > by default, therefore the value would need to be copied up to a
> > datamodel with a superior position in the states topology (such as
> > document root to be available across any other state). I will outline
> > this approach using your example below.
> >
> > Alternatively, provide the SCXMLExecutor with a custom Evaluator
> > implementation that returns the same context (the root context) on
> > every Evaluator#newContext() call to obtain a flat datamodel. If you
> > do this, there would be no changes required to the example below.
> >
> > Now, for the first approach with the default cascading datamodel, see below:
> >
> >
> >> Here is the current variant:
> >>
> >> =============file a.scxml=====================================
> >> <?xml version="1.0"?>
> >> <scxml xmlns="http://www.w3.org/2005/07/scxml"
> >>                xmlns:cs="http://commons.apache.org/scxml"
> >>       version="1.0"
> >>       profile="ecmascript"
> >>       initial="s1">
> >>
> >>  <!--  trivial 5 second microwave oven example -->
> >>  <!--  see http://commons.apache.org/scxml/guide/datamodel.html for
> >> different way to access the datamodel -->
> >>  <datamodel>
> >>    <data id="cook_time" expr="10"/>
> > <snap/>
> >
> > Define a global 'aaa' variable here, say like so (note different case
> > used here, i.e. chose a different name of choice):
> >
> >     <data id="AAA" />
> >
> >
> >>  </datamodel>
> >>
> >>  <state id="s1">
> >>    <!-- off state -->
> >>    <transition target="s2"/>
> >>  </state>
> >>
> >>  <state id="s2" src="b.scxml#s111">
> >>
> >>    <!-- on/pause state -->
> >>
> >>    <transition event="s2.done" cond="aaa eq 's3'" target="s3"/>
> >>    <transition event="s2.done" cond="aaa eq 's4'" target="s4"/>
> >>    <transition event="s2.done" target="s5"/>
> >>
> >>  </state>
> >>
> >>    <final id="s3"/>
> >>    <final id="s4"/>
> >>    <final id="s5"/>
> >> </scxml>
> >> =============end of file a.scxml==============================
> >>
> >> =============file b.scxml=====================================
> >> <?xml version="1.0" encoding="us-ascii"?>
> >> <scxml version="1.0" xmlns="http://www.w3.org/2005/07/scxml"
> >> xmlns:cs="http://commons.apache.org/scxml" initial="s111">
> >>        <state id="s111">
> >>        <initial><transition target="s11"/></initial>
> >>        <datamodel><data id="aaa"/></datamodel>
> >>
> >>    <state id="s11">
> >>                <transition target="s12">
> >>                                <!--<cs:var name="aaa" expr="'s3'" />-->
> >>                                <assign location="aaa" expr="'s3'"/>
> > <snip/>
> >
> > Change the above to point to the variable defined in the parent
> > document above like so:
> >
> >         <assign location="AAA" expr="'s3'"/>
> >
> > Obviously, this would imply that b.scxml could only be executed when
> > included in a.scxml since it references a datamodel variable in
> > a.scxml. If that is not desired, the second approach i.e. the flat
> > datamodel approach should be used.
> >
> >
> >>                </transition>
> >>    </state>
> >>
> >>        <final id="s12">
> >>        </final>
> >>        </state>
> >> </scxml>
> >> =============end of file b.scxml==============================
> >>
> >> i tried to use also <var> instead of a previously defined variable in
> >> the datamodel, without success.
> >>
> >> the simple way would be to use the donedata in a final state in the
> >> included fsm but it doesn't seem that donedata is supported, is this
> >> correct?
> >>
> > <snap/>
> >
> > Yes, not in v0.9, we will look to add it soon. You could open a JIRA
> > issue as a reminder.
> >
> >
> >> given that src is not going to be supported in the next standard, do
> >> you have some pointer to examples/doc of how to use xinclude to do
> >> what the src is supposed to do?
> >>
> > <snip/>
> >
> > Don't have a ready example, but the idea is to pull in as much of the
> > document as needs to be reused using XInclude. See XInclude
> > specification for more details. It certain cases, the XInclude
> > approach requires more work but is favored since its a standard way to
> > do includes.
> >
> > -Rahul
> >
> >
> >> thanks,
> >> fabrizio.
> >>
> >
> > ---------------------------------------------------------------------
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> > For additional commands, e-mail: user-help@commons.apache.org
> >
> >
> 
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