Re: [netcdf-java] Using NetCDF Java in Servlet

• To: "<gwang@xxxxxxx>" <gwang@xxxxxxx>
• Subject: Re: [netcdf-java] Using NetCDF Java in Servlet
• From: Jon Blower <j.d.blower@xxxxxxxxxxxxx>
• Date: Tue, 19 Apr 2011 07:22:17 +0000

Hi Guan,

Why do you need thread safety, are you intending to write to the NetCDF file or 
mutate the Variable objects in some way?  Or are you worried that two 
simultaneous reads from the same file in different threads might interfere with 
each other?  I'm pretty sure this latter kind of collision doesn't occur, so I 
assume that the code is thread-safe from this point of view.

Hope this helps,
Jon

On 18 Apr 2011, at 22:50, "Guan Wang" <gwang@xxxxxxx<mailto:gwang@xxxxxxx>> 
wrote:


Hi,



I am a newbie for NetCDF-Java library. I try to use this library directly in the

Servlet environment to access THREDDS nc aggregation datasets. Here are some

codes I put together:



----------------------------------------------------------------------------

-



Set<Enhance> DATASET_ENHANCEMENTS =EnumSet.of(Enhance.ScaleMissingDefer);



NetcdfDataset nc=NetcdfDataset.openDataset(



                        "MY_THREDDS_URL",

DATASET_ENHANCEMENTS,



                        -1,                                       null,



                        null



                        );



List<Variable> l=nc.getVariables();





Variable vv=null;



for(Variable v:l)



{



    if(v.getName().equals("time"))



    {



        vv=v;



        break;



    }



}



Array arr;



List<Range> ranges=new ArrayList<Range>();



try {



    r = new Range(8759,8759);



    ranges.add(r);



    arr=vv.read(ranges);



} catch (InvalidRangeException e) {



      e.printStackTrace();



}

nc.close();







My question is:



If all variables are defined locally, are these methods guaranteed to be 
thread-safe?



If my approach is not appropriate, is there a preferred suite of 
classes/methods that I should look into?



Thanks,



Guan

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