Module A Finish

1. Release Resources

After you are done with this experiment, release your resources using the reservation tool of choice.
Simply follow the tutorial on ​TeardownExperiment to tear down your experiment and release the resources you reserved.

2. Sample Applications

Now you can start designing and running your own experiments. Some examples are here:

​How to use OML4r

2.1 OpenFlow Statistics Measurement

ofcollect.rb

#!/usr/bin/env ruby
require 'rubygems'
require 'oml4r'
require 'file-tail'
APPNAME = "ofstats"
class MPThroughput < OML4R::MPBase
   name :ofthroughput
   param :pathtype, :type => :string
   param :numflows, :type => :int64
   param :numbytes, :type => :int64
   param :numpacket, :type => :int64
   param :throughput, :type => :int64
   param :units,        :type => :string
   param :instput, :type => :int64
   param :units2,       :type => :string
end
class OFStatsWrapper
  def initialize(args)
     @addr = nil
     @if_num = ' '
     @trema_port = ' '
     @trema_path = ' '
     @verbose = true
     @numeric = ' '
     OML4R::init(args, :appName => "#{APPNAME}_wrapper", :domain => 'foo', :collect => 'file:-') {  |argParser|
       argParser.banner = "Reports OpenFlow stat measurements via OML\n\n"
       argParser.on("-f" , "--file_path ADDRESS", "Path where output is saved"){ |address| @addr = address }
       argParser.on("-i","--interface IFNUM","Interface number"){ |if_num| @if_num ="#{if_num.to_i()}" }
       argParser.on("-q", "--no-quiet ","Don't show of stats output on console"){ @verbose = false }
       argParser.on("-n", "--[no]-numeric ", "No attempt twill be made to look up symbolic names for host addresses"){ @numeric ='-n' }
    }
     unless @addr !=nil
      raise "You did not specify path of file (-p option)"
    end
end
class MyFile < File
  include File::Tail
end
def start()
                log = MyFile.new("#{@addr}")
                log.interval = @if_num
                log.backward(10)
                puts "#{@if_num}"
                log.tail { |line| print line
                processOutput(line)
                }
end
def processOutput(output)
  column = output.split(" ")
      puts "Each line process"
      # Inject the measurements into OML
      MPThroughput.inject("#{column[0]}", column[1], column[2],
                                column[3], column[4], "#{column[5]}",
                                column[6], "#{column[7]}")
end
end
begin
  app = OFStatsWrapper.new(ARGV)
  app.start()
  rescue SystemExit
  rescue SignalException
     puts "OFWrapper stopped."
  rescue Exception => ex
  puts "Error - When executing the wrapper application!"
  puts "Error - Type: #{ex.class}"
  puts "Error - Message: #{ex}\n\n"
  # Uncomment the next line to get more info on errors
  # puts "Trace - #{ex.backtrace.join("\n\t")}"
end
OML4R::close()
# Local Variables:
# mode:ruby
# End:
# vim: ft=ruby:sw=2

OEDL script

defProperty('source1', "nowcastbox-sdxdemo", "ID of a resource")
defProperty('intervalcol',"1", "Interval to Tail")

defProperty('pathfile', "/tmp/flowstats.out", "Path to file")



defApplication('ofstats') do |app|
  app.description = 'Simple Definition for the of-collect application'
  # Define the path to the binary executable for this application
  app.binary_path = '/usr/local/bin/ofcollect.rb'
  app.defProperty('target', 'Address to output file', '-f', {:type => :string})
  app.defProperty("interval","Interval",'-i', {:type => :string})
  app.defMeasurement('wrapper_ofthroughput') do |m|
    m.defMetric(':pathtype', :string)
    m.defMetric('throughput',:int64)
    m.defMetric('instput',:int64)
  end
end
defGroup('Source1', property.source1) do |node|
  node.addApplication("ofstats") do |app|
    app.setProperty('target', property.pathfile)
    app.setProperty('interval', property.intervalcol)
    app.measure('wrapper_ofthroughput', :samples => 1)
  end
end


onEvent(:ALL_UP_AND_INSTALLED) do |event|
  info "Starting the collect"
  after 2 do
    group('Source1').startApplications
  end
  after 800 do
    info "Stopping the collect"
    allGroups.stopApplications
    Experiment.done
  end
end

defGraph 'Throughput' do |g|
  g.ms('wrapper_ofthroughput').select(:oml_ts_client, :throughput, :pathtype) 
  g.caption "Throughput of Flows"
  g.type 'line_chart3'
  g.mapping :x_axis => :oml_ts_client, :y_axis => :throughput, :group_by => :pathtype
  g.xaxis :legend => 'oml_ts'
  g.yaxis :legend => 'Throughput', :ticks => {:format => 's'}
end
defGraph 'InstantaneousThroughput' do |g|
  g.ms('wrapper_ofthroughput').select(:oml_ts_client, :instput, :pathtype) 
  g.caption "Throughput of Flows"
  g.type 'line_chart3'
  g.mapping :x_axis => :oml_ts_client, :y_axis => :instput, :group_by => :pathtype
  g.xaxis :legend => 'oml_ts'
  g.yaxis :legend => 'Instantaneous Throughput', :ticks => {:format => 's'}
end

Module A Introduction