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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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Hi Eric:If you need to send a valid netcdf file, your best bet is to write the file to disk, then copy it to the output stream. If that becomes a performance bottleneck, then you could start to think about optimizing it.
Our "streaming" format is not a standard netcdf format, and would require a specialized client.
John On 5/29/2014 8:12 AM, Ericson, Dean - 0443 - MITLL wrote:
John, Do you have any Java examples on how to stream an entire netcdf file? I've been looking on the internet and have come across some of your presentations where you say that streaming netcdf 4 'enhanced' file is not yet available (granted that was in 2012 I believe), but have seen hints that is not the case anymore. I've been looking for relevant samples, but so far have been unable to find anything concrete. We are looking to read in a netcdf file (25MB test file to start with), subset it according to a bounding box then put that newly constructed/subsetted file onto a JMS topic. I'm not sure if Variable.readToStream() would work as we're looking to send the entire file, not just a section of it. Am I reading the documentation incorrectly? Does that method only provide for streaming sections of a file? Would I have to 'loop over' the entire netcdf file, sending section by section? Any help is greatly appreciated. Thank you, Dean Ericson -------------------------- Dean Ericson MIT Lincoln Laboratory -----Original Message----- From: netcdf-java-bounces@xxxxxxxxxxxxxxxx [mailto:netcdf-java-bounces@xxxxxxxxxxxxxxxx] On Behalf Of John Caron Sent: Wednesday, May 28, 2014 5:43 PM To: netcdf-java@xxxxxxxxxxxxxxxx Subject: Re: [netcdf-java] Write to OutputStream Hi Dean: You can try Variable.readToStream(). Note this will be a binary serialization that may not be portable. Who is the consumer of the stream? Also its "experimental", and we would be glad of feedback. John On 5/28/2014 2:24 PM, Ericson, Dean - 0443 - MITLL wrote:Is anyone aware of a way that we can use the netcdf 4.3 library to write/copy/subset a netcdf file into an OutputStream? I see that the NetcdfFile object has a 'writeCDL' method, but it looks as though it has to exist on disk first. Can anyone confirm that? My use case requires that we can copy data from an input netcdf 4 file and copy/subset it onto a JMS topic. We have all other dependencies setup, it's just a matter of writing/copying the data into the OutputStream. Any help/guidance would be appreciated. Thank you, Dean Ericson Dean Ericson MIT Lincoln Laboratory _______________________________________________ netcdf-java mailing list netcdf-java@xxxxxxxxxxxxxxxx For list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/_______________________________________________ netcdf-java mailing list netcdf-java@xxxxxxxxxxxxxxxx For list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/
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