Hi Shameera,
Using python is a radical approach for workflow I think. But I believe this
is a very beautiful and new approach.Here is a possible scenario for
implementation and running using a Python based library.
The Python library facilitates the creation of Applications and submitting
them to Airavata for execution. The underlying functionality is exactly
similar to what Java clients provides.The only difference is that, Python
library should have a more fluent API than Java for easy creation of
workflows. We can generate the Python clients that talk to Airavata server
using Thrift.
Here is an example off the top of my head to a Python script created by
user for a Workflow. This is a very crude example and we need to come up
with a much better API if we are going to go along this path. First we need
to write a Python script that can execute a workflow using Airavata.
import airavata
host = Host("localhost", ....)
app1 = Application(host, ....)
app2 = Application(host, ....)
# we will connect these applications as a workflow using some topology
builder or other constructs
wb = WorkFlowBuilder()
wb.setApp("name1", app1)
# you can do a simple output transformation here etc
# connects the input of app1 to app2 etc
wb.setApp("name2", app2).connectInput("name1")
wb.submit()
Now we can load this Python script from XBaya. When XBaya loads this script
the Python script can output an XML configuration of the topology, XBaya
can render. There are other ways like directly executing the Python script
from command line and connecting XBaya indirectly as well. Now you can run
the workflow from XBaya. Running the Workflow means just executing the
Python script.
XBaya gets the notifications through messaging and update the UI
accordingly.
The users need to write the Python script by hand. XBaya cannot create the
script. Because workflow language is an actual python program the benefits
are immense. For example user can do workflow steering in the workflow
itself by subscribing to messages from Airavata.
Thanks,
Supun..
On Fri, Oct 17, 2014 at 12:41 PM, Shameera Rathnayaka <
shameerai...@gmail.com> wrote:
> Hi Supun,
>
> I meant to say JS is a well-known client side scripting language i have
> messed scripting part. Even we use Python, ultimately we should convert
> this to java model in server side, somehow we need to serialized python
> representation to the language which java can parse and generate that
> model. In this case we need to parse python script in java isn't it? I am
> not exactly clear how you suggesting to use python here. More details on
> how end system works if we use Python would be great help to clearly
> understand your points.
>
> Thanks,
> Shameera.
>
> On Fri, Oct 17, 2014 at 1:00 AM, Chris Mattmann <chris.mattm...@gmail.com>
> wrote:
>
> > Have you guys considered using JCC [1] as a means
> > to expose the workflow API currently in Java as a
> > Python API?
> >
> > We are exploring its use in OODT, and we have already
> > created a Tika [2] JCC-based python API.
> >
> > Cheers,
> > Chris
> >
> > [1] http://lucene.apache.org/pylucene/jcc/
> > [2] http://github.com/chrismattmann/tika-python/
> >
> > ------------------------
> > Chris Mattmann
> > chris.mattm...@gmail.com
> >
> >
> >
> >
> > -----Original Message-----
> > From: Supun Kamburugamuva <supu...@gmail.com>
> > Reply-To: <d...@oodt.apache.org>
> > Date: Thursday, October 16, 2014 at 3:43 PM
> > To: dev <dev@airavata.apache.org>
> > Cc: "Alek Jones (Indiana)" <alek...@gmail.com>, Suresh Marru
> > <sma...@apache.org>, "architect...@airavata.apache.org"
> > <architect...@airavata.apache.org>, "d...@oodt.apache.org"
> > <d...@oodt.apache.org>
> > Subject: Re: Evaluate Suitable Scientific Workflow Language for Airavata.
> >
> > >Once we had an offline discussion about the Airavata Workflow language
> > >(with Milinda, Saliya and Shameera). In that discussion one thing came
> out
> > >was why we need to invent a different language when a simple library
> like
> > >Python will full fill of Airavata requirements.
> > >
> > >There are many benefits in using a Python library as the API for
> > >controlling Airavata workflows.
> > >
> > >1. It is a library, gives the ultimate control over the execution and it
> > >can be simpler than any domain specific language that we can come with
> > >like
> > >XML, JSON etc
> > >2. Most people use python and can learn it easily than any Domain
> specific
> > >language
> > >3. You can easily create a Python library for Airavata because all the
> > >APIs
> > >are thrift based.
> > >4. If you design the constructs correctly you can plug an XBaya.
> > >
> > >Any thoughts?
> > >
> > >Thanks,
> > >Supun..
> > >
> > >
> > >On Thu, Oct 16, 2014 at 6:30 PM, Supun Kamburugamuva <supu...@gmail.com
> >
> > >wrote:
> > >
> > >> Hi Shameera,
> > >>
> > >> Why you prefer JavaScript over a language like Python?
> > >>
> > >> Thanks,
> > >> Supun..
> > >>
> > >> On Thu, Oct 16, 2014 at 6:25 PM, Shameera Rathnayaka <
> > >> shameerai...@gmail.com> wrote:
> > >>
> > >>> ​Hi,
> > >>>
> > >>> First of all thanks everyone for giving valuable inputs. After doing
> > >>>some
> > >>> background search and talking to different people in the University
> > >>>who has
> > >>> used different workflow languages, I myself convinced that
> introducing
> > >>>an
> > >>> another workflow language is not what actually they need. By changing
> > >>> exiting workflow language to another will not solve problems. What
> they
> > >>> asking is a easy way to construct the workflows. Indirectly what they
> > >>> asking for a sort of API which they can use to generate the workflows
> > >>>and
> > >>> run it. Correct me if i am wrong here.
> > >>>
> > >>> As most of above replies depict, if we can get a simple API, as an
> > >>> example, for a web based application, JavaScript API would be a good
> > >>> solution, and probably JSON would be a good candidate for language,
> > >>>instead
> > >>> of XML.
> > >>>
> > >>> Airavata community already have started to implement web base GUI.
> > >>>Hence
> > >>> introducing a JSON base JavaScript API would be great help. WDYT?
> > >>>
> > >>> Thanks,
> > >>> Shameera.
> > >>>
> > >>>
> > >>> On Fri, Sep 19, 2014 at 5:01 PM, Aleksander Slominski (NY) <
> > >>> alek...@gmail.com> wrote:
> > >>>
> > >>>> Hi,
> > >>>>
> > >>>> it is not dataflow instead focused on orchestrating REST services
> but
> > >>>> you may find it useful datapoint - we created worfklow service that
> > >>>>uses
> > >>>> natively JavaScript and JSON to describe what happens during
> workflow
> > >>>> execution:
> > >>>>
> > https://www.ng.bluemix.net/docs/#services/workflow/index.html#coewf002
> > >>>>
> > >>>> HTH,
> > >>>>
> > >>>> Alek
> > >>>>
> > >>>> On Thu, Sep 18, 2014 at 1:54 PM, Suresh Marru <sma...@apache.org>
> > >>>>wrote:
> > >>>>
> > >>>>> Hi Chris,
> > >>>>>
> > >>>>> Great to hear OODT community will be interested in adopting a JSON
> > >>>>> based workflow language and potentially a web based composer as
> well.
> > >>>>> Airavata previously had BPEL support initially through a home grown
> > >>>>> implementation [1] by Alek Slominski and later through Apache ODE
> > >>>>>[2]. Also
> > >>>>> a white paper [3] by Alek on this topic is an interesting read.
> > >>>>>
> > >>>>> I am of the same opinion that we should adopt something more modern
> > >>>>>as
> > >>>>> the challenges from scientific workflows seems to be converging
> with
> > >>>>>the
> > >>>>> data flow patterns in business workflows.
> > >>>>>
> > >>>>> It will be great if we can all compile a list of potential
> candidates
> > >>>>> and hack them through.
> > >>>>>
> > >>>>> Suresh
> > >>>>> [1] -
> > >>>>>
> > >>>>>
> > http://link.springer.com/chapter/10.1007%2F978-1-84628-757-2_14#page-1
> > >>>>> [2] -
> > >>>>>
> > >>>>>
> > http://www.academia.edu/1485773/Experience_with_adapting_a_WS-BPEL_run
> > >>>>>time_for_eScience_workflows
> > >>>>> [3] -
> > >>>>>
> > >>>>>
> > http://www.computer.org/csdl/proceedings/services/2010/4129/00/4129a32
> > >>>>>6.pdf
> > >>>>>
> > >>>>>
> > >>>>> On Sep 18, 2014, at 1:15 PM, Mattmann, Chris A (3980) <
> > >>>>> chris.a.mattm...@jpl.nasa.gov> wrote:
> > >>>>>
> > >>>>> > Hi Guys,
> > >>>>> >
> > >>>>> > I've been interested in this too - we don't per have a specific
> > >>>>> > OODT workflow language, but we specific workflows using XML, and
> > >>>>> > other configuration (we are also thinking of moving to JSON for
> > >>>>> > this).
> > >>>>> >
> > >>>>> > In the past I've also looked at YAWL and BPEL - both seem complex
> > >>>>> > to me.
> > >>>>> >
> > >>>>> > I wonder at the end of the day if we should adopt something more
> > >>>>> > modern like PIG or some other data flow type of language (PIG
> > >>>>> > is really neat).
> > >>>>> >
> > >>>>> > Cheers,
> > >>>>> > Chris
> > >>>>> >
> > >>>>> >
> > >>>>> >
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> > >>>>> > Chris Mattmann, Ph.D.
> > >>>>> > Chief Architect
> > >>>>> > Instrument Software and Science Data Systems Section (398)
> > >>>>> > NASA Jet Propulsion Laboratory Pasadena, CA 91109 USA
> > >>>>> > Office: 168-519, Mailstop: 168-527
> > >>>>> > Email: chris.a.mattm...@nasa.gov
> > >>>>> > WWW: http://sunset.usc.edu/~mattmann/
> > >>>>> >
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> > >>>>> > Adjunct Associate Professor, Computer Science Department
> > >>>>> > University of Southern California, Los Angeles, CA 90089 USA
> > >>>>> >
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> > >>>>> >
> > >>>>> >
> > >>>>> >
> > >>>>> >
> > >>>>> >
> > >>>>> >
> > >>>>> > -----Original Message-----
> > >>>>> > From: Shameera Rathnayaka <shameerai...@gmail.com>
> > >>>>> > Reply-To: "architect...@airavata.apache.org"
> > >>>>> > <architect...@airavata.apache.org>
> > >>>>> > Date: Thursday, September 18, 2014 8:26 AM
> > >>>>> > To: "architect...@airavata.apache.org" <
> > >>>>> architect...@airavata.apache.org>,
> > >>>>> > dev <dev@airavata.apache.org>
> > >>>>> > Subject: Evaluate Suitable Scientific Workflow Language for
> > >>>>>Airavata.
> > >>>>> >
> > >>>>> >> Hi All,
> > >>>>> >>
> > >>>>> >> As we all know Airavata has its own workflow language call XWF.
> > >>>>>When
> > >>>>> XWF
> > >>>>> >> was introduced, main focus points are interoperability and
> > >>>>> convertibility.
> > >>>>> >> But with years of experience it is convinced that above
> > >>>>>requirements
> > >>>>> are
> > >>>>> >> not really useful when we come to real world use cases. And XWF
> is
> > >>>>> XML
> > >>>>> >> based bulky language where we attache WSDLs and Workflow image
> it
> > >>>>> self.
> > >>>>> >> But
> > >>>>> >> with the recent changes WSDL part is being removed from XWF.
> > >>>>> >>
> > >>>>> >> It is worth to evaluate handy Scientific workflow languages in
> > >>>>> industry
> > >>>>> >> and
> > >>>>> >> find out pros and cons, at the end of this evaluation we need to
> > >>>>> come up
> > >>>>> >> with idea how we should improve Airavata workflow language,
> either
> > >>>>> we can
> > >>>>> >> improve existing XWF language, totally change to a new language
> > >>>>> available
> > >>>>> >> in industry or write a new light weight language. Basic
> > >>>>>requirements
> > >>>>> that
> > >>>>> >> we expect from new improvement are, high usability, flexible,
> > >>>>>light
> > >>>>> weight
> > >>>>> >> and real time monitoring support. As you can see above
> > >>>>>requirements
> > >>>>> are
> > >>>>> >> not
> > >>>>> >> direct comes with workflow languages but we need workflow
> language
> > >>>>> which
> > >>>>> >> help to support above requirements.
> > >>>>> >>
> > >>>>> >> After reading few papers and googling, initially i have come up
> > >>>>>with
> > >>>>> >> following three existing languages,
> > >>>>> >> 1. YAWL <http://www.yawlfoundation.org/>
> > >>>>> >> 2. WS-BPEL
> > >>>>> >> ​3. SIDL
> > >>>>> >> <
> http://computation.llnl.gov/casc/components/index.html#page=home
> > >
> > >>>>> >>
> > >>>>> >> In my opinion SIDL is more familiar with scientific domain,
> > >>>>> Radical-SAGA
> > >>>>> >> also uses slightly modified version of SIDL. Other than above
> > >>>>>three
> > >>>>> >> languages we can come up with simple workflow language base on
> > >>>>> json(or
> > >>>>> >> yaml) which support all our requirements for some extends.
> > >>>>> >>
> > >>>>> >> It would be grate if I can get more input regarding the $Subject
> > >>>>> form the
> > >>>>> >> airavata community. You all are more than welcome to provide any
> > >>>>> type of
> > >>>>> >> suggestions.
> > >>>>> >>
> > >>>>> >> Thanks,
> > >>>>> >> Shameera.
> > >>>>> >>
> > >>>>> >> ​
> > >>>>> >>
> > >>>>> >> --
> > >>>>> >> Best Regards,
> > >>>>> >> Shameera Rathnayaka.
> > >>>>> >>
> > >>>>> >> email: shameera AT apache.org , shameerainfo AT gmail.com
> > >>>>> >> Blog : http://shameerarathnayaka.blogspot.com/
> > >>>>>
> > >>>>>
> > >>>>
> > >>>>
> > >>>> --
> > >>>> The best way to predict the future is to invent it - Alan Kay
> > >>>>
> > >>>
> > >>>
> > >>>
> > >>> --
> > >>> Best Regards,
> > >>> Shameera Rathnayaka.
> > >>>
> > >>> email: shameera AT apache.org , shameerainfo AT gmail.com
> > >>> Blog : http://shameerarathnayaka.blogspot.com/
> > >>>
> > >>
> > >>
> > >>
> > >> --
> > >> Supun Kamburugamuva
> > >> Member, Apache Software Foundation; http://www.apache.org
> > >> E-mail: supu...@gmail.com; Mobile: +1 812 369 6762
> > >> Blog: http://supunk.blogspot.com
> > >>
> > >>
> > >
> > >
> > >--
> > >Supun Kamburugamuva
> > >Member, Apache Software Foundation; http://www.apache.org
> > >E-mail: supu...@gmail.com; Mobile: +1 812 369 6762
> > >Blog: http://supunk.blogspot.com
> >
> >
> >
>
>
> --
> Best Regards,
> Shameera Rathnayaka.
>
> email: shameera AT apache.org , shameerainfo AT gmail.com
> Blog : http://shameerarathnayaka.blogspot.com/
>
--
Supun Kamburugamuva
Member, Apache Software Foundation; http://www.apache.org
E-mail: supu...@gmail.com; Mobile: +1 812 369 6762
Blog: http://supunk.blogspot.com
