Rakefile

task :default do |t|
  require './ruby/rest_service'
  RestService.run!
end

task :client, :cmd do |t, args|
  classpath = '.'
  Dir.glob('lib/*.jar').each {|file| classpath += ":#{file}" }
  puts `scala -cp #{classpath} RestClient.scala #{args[:cmd]}`
end

rest_service.rb

#a simple REST service that replicates the one used in Scala in Action 2nd ed., Ch. 2

require 'sinatra/base'

class Object
  def dump_info
    #need to filter out Rack variables
    self.inject('') {|str, elem| elem[0] !~ /^rack\./ ? "#{str}|#{elem[0]}->#{elem[1]}" : str }
  end
end

class RestService < Sinatra::Base
  def get_request_info params, request
    ["parameters: #{params.dump_info}", "headers: #{request.env.dump_info}"]
  end

  get '/' do
    ret = ['GET method called']
    (ret + get_request_info(params, request)).join "\n"
  end

  post '/' do
    ret = ['POST method called']
    (ret + get_request_info(params, request)).join "\n"
  end

  delete '/' do
    "DELETE method called\n"
  end
end