Class: CTioga2::Data::Backends::GnuplotBackend

Inherits:
Backend
  • Object
show all
Includes:
Log, Dobjects
Defined in:
lib/ctioga2/data/backends/backends/gnuplot.rb

Instance Method Summary collapse

Methods included from Log

debug, error, fatal, #format_exception, #identify, info, init_logger, logger, set_level, #spawn, warn

Methods inherited from Backend

#dataset, describe, #description, #expand_sets, #has_set?, #initialize, list_backends, #set_param_from_string, #sets_available

Methods included from BackendDescriptionExtend

#base_description, #create_factory, #describe, #description, #factory_class, #factory_description, #factory_description_hash, #factory_description_list, #has_factory?, #inherit_parameters, #param, #param_accessor, #param_reader, #param_writer, #register_class, #set_description

Constructor Details

This class inherits a constructor from CTioga2::Data::Backends::Backend

Instance Method Details

#query_dataset(set) ⇒ Object

This is called by the architecture to get the data. It splits the set name into filename@cols, reads the file if necessary and calls get_data



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# File 'lib/ctioga2/data/backends/backends/gnuplot.rb', line 57

def query_dataset(set)
  set =~ /^(.*?)(?:@(\d+))?(?::(.*))?$/
  filename = $1
  if $2
    number = $2.to_i - 1
  else
    number = 0
  end
  if $3
    overrides = "#{@variable_overrides};#{$3}"
  else
    overrides = @variable_overrides
  end
  plots = run_gnuplot(filename, overrides)
  return Dataset.new(set,plots[number])
end

#run_gnuplot(filename, overrides = @variables_overrides) ⇒ Object

Runs gnuplot on the file, and returns all datasets found inside it.



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# File 'lib/ctioga2/data/backends/backends/gnuplot.rb', line 76

def run_gnuplot(filename, overrides = @variables_overrides)
  date = File::mtime(filename)
  # Get it from the cache !
  debug "Running gnuplot on file #{filename}"
  f = File.open(filename)
  # We open a bidirectionnal connection to gnuplot:
  gnuplot = IO.popen("gnuplot", "r+")
  output = ""
  gnuplot.puts "set term table"
  for line in f
    next if line =~ /set\s+term/
    if overrides and line =~ /plot\s+/
      debug "Found a plot, inserting variable overrides: #{overrides}"
      line.gsub!(/plot\s+/, "#{overrides};plot ")
    end
    if @range and line =~ /plot\s+/
      debug "Found a plot, inserting range: #{@range}"
      line.gsub!(/plot\s+(\[[^\]]+\])?/, 
                 "plot [#{@range}]")
    end
    gnuplot.print line 
    gnuplot.flush
    output += slurp(gnuplot)
  end
  
  # Output a "\n" in the end.
  
  gnuplot.puts ""
  gnuplot.flush
  gnuplot.close_write
  # Then we get all that is remaining:
  output += gnuplot.read
  gnuplot.close
  
  # Now, interaction with gnuplot is finished, and we want to
  # parse that:
  outputs = output.split("\n\n")
  plots = []
  for data in outputs
    plots << Dvector.fancy_read(StringIO.new(data), [0,1])
  end
  # This block evaluates to plots:
  return plots
end

#slurp(f, size = 10240) ⇒ Object

Gets all data from the given file until it blocks, and returns it.



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# File 'lib/ctioga2/data/backends/backends/gnuplot.rb', line 122

def slurp(f, size = 10240)
  str = ""
  begin
    while IO::select([f],[],[],0)
      ret = f.readpartial(size)
      if ret.empty?
        return str
      end
      str << ret 
    end
  end
  return str
end