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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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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 > >> > > >> > > > > > > > -- -------------------------------------------------------------- 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 3 Earley Gate Reading RG6 6AL, UK --------------------------------------------------------------
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