commons-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Rahul Akolkar <>
Subject Re: [SCXML] Development plan about SCXML Visual editor
Date Thu, 06 May 2010 15:07:16 GMT
2010/5/5 Xun Long Gui <>:
> Hi Rahul,
> I am back and get ready for submitting my demo code to a SVN server, but i
> do not know where can i share my code ? I saw something about GSoC sandbox
> SVN server in the mail list but does not get the detail yet. So, i am a
> little confused about how to start my sharing job, thank you.

Yes, we are discussing what the SVN location should be for the GSoC
work in this [1] thread. We will create separate SVN spaces for both
the projects this year in the Commons sandbox [2, 3] order to:

 * Make it easier for committers to provide and apply patches
 * Make it easier for GSoC participants to demonstrate mid-summer and
end of summer progress

Likely, the creating of these directories in SVN will happen over the
weekend when I get a chance.

For the purposes of populating the SVN space with your work (starter
code you have available now or soon), perhaps its best to follow the
approach below, if you agree:

 * Create a list of tasks associated with your main JIRA issue,
SCXML-116 [4] as described in this email [5]. In particular, see the
ATTIC-1 example mentioned in that email. I think such a task list may
also help in your GSoC progress reports later.
 * One of the first tasks, then, may be abouting posting your starter
code into SVN. For that task, attach a zip containing the source you
want added to SVN and I will check it in. Please use the coding style
that is used in Commons SCXML code. Its pretty much the "Sun
conventions" [6], but when in doubt, please check the SCXML sources
for consistency.
 * Further changes may then be supplied as patches [7] to the above.

Let us know if any of this needs more clarification, or if there are
other questions.



> Best Regards
> Long
> 在 2010年5月2日 下午2:05,Rahul Akolkar <>写道:
>> Hi Long,
>> You can simply send emails to the Commons dev mailing list (rather
>> than to me and CC'ing the list). I read mostly all emails on the list,
>> and especially those related to SCXML or GSoC.
>> 2010/4/29 Xun Long Gui <>:
>> > Hi Rahul,
>> > Althrough Google told us that students should start coding job at May 25,
>> > but i think, for me and this project, it is time to move now.
>> <snip/>
>> OK, that date is just a guideline really, its upto you.
>> > I think this
>> > tool is not a simple tool, two months long time is not enough actually. I
>> > started coding experience job weeks ago and got a demo about this
>> project,
>> > but it is just a demo, if we want to make it well developed and
>> practical,
>> > it is a simple thing. Now, here is my develop plan, we should finish it
>> step
>> > by step, there are mainly four steps in all.
>> >
>> > Step 1. Finish basic data model design, create a visual state
>> > add/edit/delete tool
>> > We can use GMF to generate many codes for this tool, but the  premise is
>> > that we must have a correct EMF data model about this tool. For example,
>> > only if we have a ASSIGN STATE in this data model,  then we can find a
>> > ASSIGN STATE component in toolbar of final editor. As we know, a SCXML
>> > document has only one START state, if we make wrong in the EMF data
>> model,
>> > may be in the final editor, we can add several START states for a SCXML
>> > document, obviously, it is wrong.
>> >
>> > So,EMF data model is very important for a GMF visual editor, and SCXML
>> > specification is not a simple specification, i should read it carefully
>> and
>> > even get a proper data model for this project. Fortunately, i have
>> cleaned
>> > all the technology difficulites in this period. I need just time to
>> finish
>> > this period. I think it will cost me 5-6 weeks.
>> >
>> <snap/>
>> Yes, getting the EMF model correct is ofcourse important. If you think
>> its a good idea, it may be better to make some editor function
>> available much sooner than 5 weeks (perhaps with a smaller feature
>> set) and then improve it or complete the coverage for the SCXML
>> specification. So, we may simply start with what you have in your
>> demo, get it in SVN now or within a few days (by submitting a patch in
>> JIRA) and have others try it out while you make improvements.
>> In general, I think its better to get in the habit of making
>> incremental changes and SVN commits. Not only does this allow other
>> developers here to follow what you are doing, but will also be useful
>> during your mid-summer and end of summer progress reports and
>> deliverables for GSoC.
>> > Step 2. SCXML document export and import function
>> > After we finish a SCXML document edit job in this tool, we should export
>> it
>> > to a XML format document, this is a data model to xml document job, not
>> very
>> > hard.
>> >
>> > Also, we should supplies SCXML document import function, users use this
>> tool
>> > to import existing SCXML document, then edit, and export it again. I
>> think
>> > this is also a regular job process.
>> >
>> <snip/>
>> If we can get a usable level of round-tripping between the SCXML
>> serialization and the editor (editor -> XML -> editor as well as XML
>> -> editor -> XML style scenarios), that'd be nice indeed.
>> > In this period, we should finish some Eclipse extension point
>> implemention
>> > job as well as data model to XML transfer job, it will cost me 2-3 weeks.
>> >
>> > Step 3. Degug function
>> > It is hard to finish a fantastic debug tool, especially in such a short
>> > time. But at least, i will finsih state logic check part for this tool.
>> For
>> > example, if there is a dead loop in the state transition diagram, this
>> tool
>> > will give user some tips and warnings.
>> >
>> > Step 4. Code generation function
>> > If we have time left, i want to finish JAVA code generation job for this
>> > tool. It will generate JAVA classes with the same function with editing
>> > SCXML document.
>> >
>> <snap/>
>> OK, would you like to start documenting (perhaps on the wiki) the
>> plans for Steps 3 and 4 in more detail over the next couple of weeks?
>> We can always revise the estimates later based on progress in Steps 1
>> and 2 and the time those take. Will also help to start brainstorming
>> suitable approaches towards implementing these.
>> > Rahul, as you pointed before, Step 1 and 2 are the core components for
>> this
>> > tool, so i will pay much attention to this two parts, if we can finish
>> these
>> > two parts well, many people will benefit from this tool. I want to
>> > contribute this tool to Apache Commons SCXML project as a beta publish
>> > version once i finish these two steps. Then,more user and developers can
>> > find it in Apache web site, may be they can also give us some good
>> advises
>> > to improve it.
>> >
>> > Step 3 and 4 is extend functions for this tool, it will make this tool
>> > better, but these two parts exist in my brain only, i have not done any
>> > experiments to get right ways to impelent them. I will try my best to
>> finish
>> > them well, may be in Google Summer Code time, i can not finish them, but
>> i
>> > will still work for them.
>> >
>> > This is my plan, your opinion ? Thank you !
>> <snip/>
>> See comments above. Thanks for getting started :-)
>> -Rahul
>> > --
>> > Best Regards
>> >
>> > Gui Xun Long (桂训龙)
>> >
> --
> Best Regards
> Gui Xun Long (桂训龙)

To unsubscribe, e-mail:
For additional commands, e-mail:

View raw message