My project is a client/server model that uses RMI to communicate across
the network. The server returns a FlatField to the client generated
from a netcdf file using Plain().open:
public FlatField GetSOM(String stem) throws VisADException, IOException
{
Plain plain=new Plain();
String filename=GenerateNetcdf(stem);
FlatField netcdf_data=(FlatField) plain.open(filename+".nc");
Process shell=Runtime.getRuntime().exec("/bin/rm -f "+filename+".nc");
return(netcdf_data);
}
However, I wanted to get rid of the dependance on netcdf because it
requires I use ncgen to convert my CDL to a netcdf file which consequently
makes it less portable. The replacement code is below. Now, if I call the
server more than once it generates the exception:
visad.TypeException: ScalarType: name already used
at this line
RealType X=new RealType("X",null,null);
I need the name to be "X" because I use axis labels. I cannot figure out
how to get around this problem. How can I fix the following method so
one or more clients can call it repeatedly without generating this exception?
Why does this work just fine if I use the above netcdf code?
public FlatField GetSOM(String stem) throws VisADException, IOException
{
// construct a MathType ((X, Y) -> documents)
RealType X=new RealType("X",null,null);
RealType Y=new RealType("Y",null,null);
RealTupleType XY=new RealTupleType(new RealType[] {X,Y});
RealType Documents=new RealType("documents",null,null);
FunctionType field_type=new FunctionType(XY,Documents);
Process shell=Runtime.getRuntime().exec("equinox get-som "+stem);
BufferedReader in
new BufferedReader(new InputStreamReader(shell.getInputStream()));
StringTokenizer tokenstream=new StringTokenizer(in.readLine()," ");
int width=Integer.parseInt(tokenstream.nextToken());
int height=Integer.parseInt(tokenstream.nextToken());
Integer2DSet domain_set=new Integer2DSet(width,height);
FlatField field=new FlatField(field_type,domain_set);
float[][] data=new float[1][width*height];
for (int i=0; i < (width*height); i++)
{
tokenstream=new StringTokenizer(in.readLine()," ");
int x=Integer.parseInt(tokenstream.nextToken());
int y=Integer.parseInt(tokenstream.nextToken());
int z=Integer.parseInt(tokenstream.nextToken());
data[0][x+y*width]=z;
}
in.close();
field.setSamples(data);
return(field);
}
As soon as I resolve this problem, I will making this application available
on the Net so others can benefit from my efforts.
