+1, I agree
On Fri, Jun 6, 2014 at 8:18 AM, Srinath Perera <[email protected]> wrote: > +1 for template:xxx > > Mind you above templates are just a once step towards a DSL as you > mentioned. Although paper talk about some cases related to DSL, general DSL > is quite a lot of work AFAIK. > > --Srinath > > > On Wed, Jun 4, 2014 at 11:10 AM, Sriskandarajah Suhothayan <[email protected]> > wrote: > >> Good suggestion Srinath, >> Only concern is that these templates may get confused with the function >> expressions. >> We may need to have a better separation on that. >> >> One simple option is to use template.xxx(...) >> >> Another possibility is using another level of domain specific abstraction >> to the language & CEP >> E.g >> >> if stock("WSO2") price increasing then send email to("[email protected] >> ") >> if list("[email protected]") get more_then 20 mail per 1 hour then >> ... >> >> Then allow implementers to map the above to siddhi + CEP input/output >> adapters >> We may need to come up with a extensible architecture so that we can >> achieve this >> >> These domain specific customisations may involve some coding but since >> its a one time effort >> it will be still very useful for a non technical users to adopt CEP. >> >> Regards >> Suho >> >> >> >> >> On Tue, Jun 3, 2014 at 10:10 AM, Srinath Perera <[email protected]> wrote: >> >>> Hi Suho, All, >>> >>> We were chatting at DEBS about possibility of supporting "templates" in >>> Siddhi, so we can build more descriptive functions into Siddhi without >>> having to extend the language. e.g. have a increasing( ..) function instead >>> of having to write complex query. (e.g. just like ESB templates) >>> >>> I have been thinking about this and have some thoughts about how to do >>> this. Please comment. >>> >>> e.g 1. consider "Increasing" >>> >>> >>> from e1=Speed->e2=speed[v > e1.v] insert into ... >>> >>> template >>> ======= >>> define template Increasing($S1, $val1){ >>> e1=$S1->e2=$S2[v$val> e1.v]; >>> return e1,e2; >>> } >>> >>> then query will look like >>> >>> from increasing("Speed", "v") insert into .. >>> >>> e.g. 2 >>> >>> define template vShape($S1, $val1){ >>> $S1 as e1, $S1[v$val> e1.v]+ as e2,$S1[v$val< e2[last].v]+ as e3; >>> return e1,e2, e3; >>> } >>> >>> then final query looks like >>> >>> from vShape("Speed", "v") insert into .. >>> >>> Note this is just a template, not a function. We expand the query like a >>> macro. >>> >>> Execution is that we expand queries using macros before execution. I >>> think macro can have chain of streams to make its functions readable. >>> >>> We have to think about different scenarios, but in general I think this >>> should work. >>> >>> Thanks >>> Srinath >>> >>> -- >>> ============================ >>> Srinath Perera, Ph.D. >>> Director, Research, WSO2 Inc. >>> Visiting Faculty, University of Moratuwa >>> Member, Apache Software Foundation >>> Research Scientist, Lanka Software Foundation >>> Blog: http://srinathsview.blogspot.com/ >>> Photos: http://www.flickr.com/photos/hemapani/ >>> Phone: 0772360902 >>> >> >> >> >> -- >> >> *S. Suhothayan* >> Technical Lead & Team Lead of WSO2 Complex Event Processor >> *WSO2 Inc. *http://wso2.com >> * <http://wso2.com/>* >> lean . enterprise . middleware >> >> >> *cell: (+94) 779 756 757 <%28%2B94%29%20779%20756%20757> | blog: >> http://suhothayan.blogspot.com/ <http://suhothayan.blogspot.com/> twitter: >> http://twitter.com/suhothayan <http://twitter.com/suhothayan> | linked-in: >> http://lk.linkedin.com/in/suhothayan <http://lk.linkedin.com/in/suhothayan>* >> > > > > -- > ============================ > Srinath Perera, Ph.D. > Director, Research, WSO2 Inc. > Visiting Faculty, University of Moratuwa > Member, Apache Software Foundation > Research Scientist, Lanka Software Foundation > Blog: http://srinathsview.blogspot.com/ > Photos: http://www.flickr.com/photos/hemapani/ > Phone: 0772360902 > -- *S. Suhothayan* Technical Lead & Team Lead of WSO2 Complex Event Processor *WSO2 Inc. *http://wso2.com * <http://wso2.com/>* lean . enterprise . middleware *cell: (+94) 779 756 757 | blog: http://suhothayan.blogspot.com/ <http://suhothayan.blogspot.com/>twitter: http://twitter.com/suhothayan <http://twitter.com/suhothayan> | linked-in: http://lk.linkedin.com/in/suhothayan <http://lk.linkedin.com/in/suhothayan>*
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