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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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To learn about what's going on, see About the Archive Site.
Hello, Thanks for all of your answers. I think the best way for me is to write a subclass of thredds.servlet.DatasetSource. However, I didn't see any link to get TDS source code ? I'll also take a look at F-TDS and PyDap projects, which seems very intersting. I can give you some feedback regarding my progress, if you're intersted in. Stéphane On Thu, Jun 4, 2009 at 3:52 PM, Roland Schweitzer < Roland.Schweitzer@xxxxxxxx> wrote: > Ethan Davis wrote: > > Hi Stéphane, > > Stéphane wrote: > > > Stephane: > Sorry, but I don't have any knowledge about grib generation! > > Ethan: > My grib data is stored in a database, in a specific format. > The script extract the data from my database and is able to perform > specific action, like sub grib extraction. > > I think the good way is to trigger the script on demand from Thredds. > But I don't see any way to do call external program from Thredds ? > > > The TDS does not currently have a way to call a script or access a > database for data retrieval. Besides extracting some data by hand and > then configuring the TDS to serve that data, the only things that come > to mind involve writing some Java code. If that is something you are > interested in, take a look at the following two possibilities: > > 1) The thredds.servlet.DatasetSource interface which provides > implementations with information from the incoming HTTP request and > response objects that can then be used to locate/build and return a > netCDF dataset. The TDS Reference Document discusses the DatasetSource > interface at the following link: > http://www.unidata.ucar.edu/projects/THREDDS/tech/reference/DatasetSource.html > > 2) The ucar.nc2.iosp.IOServiceProvider interface can be implemented to > read new data formats and represent them through the netCDF-Java API as > a netCDF dataset. The netCDF-Java Tutorial has a section on the I/O > Service Provider interface: > http://www.unidata.ucar.edu/software/netcdf-java/tutorial/index.html > > Hope that is helpful. > > > > By using the DataSource and IOSP plugins to TDS we are able to run > external programs to create data files on-demand and serve them via TDS. If > you decide that you want to undertake the job of writing of some Java code > to implement a similar process you might want to take a look at our code. > Creating sub-classes of the Task and Tool classes to run your particular > scripts or external programs might save you some work. > > Some details can be found here: > http://ferret.pmel.noaa.gov/LAS/documentation/the-ferret-thredds-data-server-f-tds > . > > Slides from a talk about F-TDS are here: > http://go-essp.gfdl.noaa.gov/2008/files/Roland-Schweitzer-GO-ESSP_09_2008.ppt > . > > There's a better talk (more general and not as focused on server-side > functions) on the OPeNDAP developers wiki, but it seems to be down at the > moment. > > Roland > > Ethan > > > > On Tue, Jun 2, 2009 at 6:59 PM, Ethan Davis > <edavis@xxxxxxxxxxxxxxxx<mailto:edavis@xxxxxxxxxxxxxxxx> > <edavis@xxxxxxxxxxxxxxxx>> wrote: > > Hi Stéphane, > > Where is the GRIB data and what is the script doing to copy/move the > data into your directory? > > Ethan > > Stéphane wrote: > > Hello, > > > > I access a set of grib data from a script. > > I would like to offer these data through Thredds server. > > > > I success to manualy extract a grib with my script, put it in a > > directory and then access it through Thredds. It works fine ! > > But now, I would like that Thredds server automatically call my script > > to extract the data. > > > > Is there any way to do that ? > > > > Thanks a lot, > > Stéphane > > > > > >
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