type file;

// Simulate encapsulating an app's parameters as a struct

type params {
  int x;
  int y;
  float r;
  boolean b;
  string infilename;
  string outfilename;
};

// Simulate an app

myapp(params p, file infile, file outfile )
{  
    app {  
        db "pecho:" p.x p.y p.r p.b p.infilename p.outfilename  @infile @outfile ;
    }  
}  

// Loop over the parameter array, calling app in parallel

doall(params plist[])
{
  foreach pval,j in plist {

    // convert filename string to mapped file reference
    file infile <single_file_mapper;file=pval.infilename>;
    file outfile <single_file_mapper;file=pval.outfilename>;

    // Call the application
    myapp(pval,infile, outfile);
  }
}

// Main

params plist[];
plist = readdata("parameters");
doall(plist);