Thanks, this looks like what I might want. My issue with the current
service-oriented approach to IOSP (although I completely understand
why it works this way from a plugin point of view) is that it might be
hard or expensive for an IOSP to detect a file of the correct format.
If you can force the use of a given IOSP you can get around this.
Cheers, Jon
On Thu, Feb 14, 2008 at 5:36 PM, John Caron <caron@xxxxxxxxxxxxxxxx> wrote:
> Im not sure what's the context, but this may be what you want:
>
> static public NetcdfFile open(String location, String className, int
> bufferSize, CancelTask
> cancelTask, String iospClassName);
>
> undocumented at the moment, but a look at the source should make it obvious.
>
>
>
> Jon Blower wrote:
> > Hi John,
> >
> > Is it possible to explicitly specify the IOServiceProvider that should
> > be used when opening a Netcdf file/dataset? In my case I will know
> > what IOSP to use in advance and coding the isValidFile() method could
> > be tricky in general.
> >
> > I guess I could use a single IOSP (whose isValidFile() always returns
> > true) and use the spiObject as a signal to work out the internal logic
> > (perhaps delegating to other IOSPs).
> >
> > Cheers, Jon
> >
> > On Sat, Jan 26, 2008 at 8:25 PM, John Caron <caron@xxxxxxxxxxxxxxxx> wrote:
> >>
> >> Jon Blower wrote:
> >> > Hi,
> >> >
> >> > I have a couple of questions about IOServiceProviders:
> >> >
> >> > 1) What happens if two IOServiceProviders return true for
> >> > isValidFile()? Which provider is used?
> >>
> >> the first one thats asked. user-loaded iosps are loaded in front of the
> system ones, so users can override.
> >>
> >>
> >>
> >> > 2) When does sync() get called?
> >>
> >> sync is an attempt to deal with files that change after being opened.
> most IOSPs cant handle this, but we are curently trying to make it work for
> netcdf-3 record dimension growth and grib files.
> >>
> >> the main case is from NetcdfFileCache, sync is called when a cached file
> is found. NcML aggregation also calls this.
> >>
> >> >
> >> > Thanks,
> >> > Jon
> >> >
> >>
> >
> >
> >
>
--
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Dr Jon Blower Tel: +44 118 378 5213 (direct line)
Technical Director Tel: +44 118 378 8741 (ESSC)
Reading e-Science Centre Fax: +44 118 378 6413
ESSC Email: jdb@xxxxxxxxxxxxxxxxxxxx
University of Reading
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