Simple service driven architecture

service-odt.rb

module Service
	class ODT < Service::Base
		def hello(str)
			super
			puts 'ODT is here ...'
		end
	end
end

Service.register :odt do
	Service::ODT.new('ODT')
end

service-pdf.rb

module Service
	class PDF < Service::Base				
		def hello(str)
			super
			puts 'PDF is here ...'
		end
	end
end

Service.register :pdf do
	Service::PDF.new('PDF')
end

service-sucks.rb

module Service
	class Sucks < Service::Base				
		def hello(str)
			super
			puts 'Sucks is here ...'
		end
	end
end

Service.register :sucks do
	Service::Sucks.new('SUCKS')
end

service.rb

module Service	
	class << self
		def services
			@services ||= {}
		end
		
		def services_for(*names)
			services.each do |name, service|
				yield(service) if names.include? name
			end
		end
		
		def upload(options)
			filename = options[:filename] or return
			ext = File.extname(filename)[1..-1] or return
			
			services_for :sucks, ext.to_sym do |service|
				service.hello('uploading')
			end
		end
				
		def register(name)
			services[name] = yield
		end
	end
	
	class Base
		attr_reader :name
		attr_accessor :xyz
			
		def initialize(name)
			@name = name
			@xyz = nil
		end
		
		def hello(str)
			puts "#{@name} said #{str} ..."
		end
	end
end

require 'service-pdf'
require 'service-odt'
require 'service-sucks'

test.rb

require 'service'

Service.services_for :pdf, :odt do |service|
	service.hello('boo foo')
end

Service.upload :filename => 'myfile.pdf'
Service.upload :filename => 'myfile.odt'