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Rails Engines as an SOA Middle Ground

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Before We Begin

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I DON’T ALWAYS SAY ALWAYS BUT WHEN I DO I ALMOST NEVER MEAN IT

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Have You Been Here?

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5 minutes?

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15 minutes?

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30 minutes?

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Longer!?

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WE FEAR CHANGE

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Object-Orientation

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=

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$ bundle update my_engine

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gem  'my_engine',        :path  =>  '/path/to/my/engine'

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Gems

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"This might make a nice open source project."

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"If I don't release it to rubygems.org, how do I use it in my projects?"

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Add it to your GEM_PATH manually

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$ export GEM_PATH=/path/to/gem;$GEM_PATH

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Use a private git repo in your Gemfile

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gem  'my_engine',        :git  =>  '/path/to/my/git/repo'

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Use a local gem server

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$ gem server

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$ gem sources --add http://localhost:8808

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source ‘http://localhost:8808’ # Gemfile

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Use a 3rd party service

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Railties

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A Type of Gem

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class  MyRailtie  <  Rails::Railtie    #  Does  Stuff end

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require  ‘my_railtie’  if  const_defined?(Rails)

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Add Middleware

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Create/Update Configuration Settings

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Add Generators

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Run Code at Rails Console Load Time

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Add Rake Tasks

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Create Rails Initializers

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after_initialize app_middleware before_configuration before_eager_load before_initialize generators to_prepare

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$ rake spec

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module  RSpec module  Rails class    Railtie  <  ::Rails::Railtie    config.generators.integration_tool  :rspec    config.generators.test_framework      :rspec    rake_tasks  do        load  "rspec/rails/tasks/rspec.rake"    end end end end

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Engines

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irb> Rails::Engine.ancestors # => [        [0]  Rails::Engine  <  Rails::Railtie,        [1]  Rails::Railtie  <  Object,        [2]  Rails::Initializable,        [3]  Object  <  BasicObject,        [4]  Kernel,        [5]  BasicObject ]

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irb> MyRailsApp::Application.ancestors # => [        [0]  MyApp::Application  <  Rails::Application,        [1]  Rails::Application  <  Rails::Engine,        [2]  Rails::Engine  <  Rails::Railtie,        [3]  Rails::Railtie  <  Object,        [4]  Rails::Initializable,        [5]  Object  <  BasicObject,        [6]  Kernel,        [7]  BasicObject ]

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Images CSS Javascript Models Controllers Observers Mailers Migrations

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Rails.application.routes.draw  do    mount  MyEngine::Engine  =>  "/my_engine" end

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http://yourapp/admin

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Now What?

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Gem Extraction

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You're formatting them You're converting them to latitude/longitude You're validating them You're verifying them against an external API

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class  Event    include  ActiveModel::Model    define_attribute_methods    :venue_name,            :venue_street,                                                        :venue_city,            :venue_state,                                                        :venue_zip_code,    :venue_country    validates                                  :venue_name,                                                        :presence  =>  true    validates                                  :venue_city,                                                        :presence  =>  {                                                            :if  =>  :venue_partially_set?  }    #  Lots  more  lines  of  validations...    def  address_in_one_line_format;                #  Code  here;  end    def  address_in_multiline_text_format;    #  Code  here;  end    def  address_in_html_format;                        #  Code  here;  end end

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class  User    include  ActiveModel::Model    define_attribute_methods    :business_address_name,            :business_address_street,                                                        :business_address_city,            :business_address_state,                                                        :business_address_zip_code,    :business_address_country    validates                                  :business_address_name,                                                        :presence  =>  true    validates                                  :business_address_city,                                                        :presence  =>  {                                                            :if  =>  :business_address_partially_set?  }    #  Lots  more  lines  of  validations...    def  address_in_one_line_format;                #  Code  here;  end    def  address_in_multiline_text_format;    #  Code  here;  end    def  address_in_html_format;                        #  Code  here;  end end

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class  Event    include  ActiveModel::Model    define_attribute_methods    :venue_name,            :venue_street,                                                        :venue_city,            :venue_state,                                                        :venue_zip_code,    :venue_country    validates                                  :venue_name,                                                        :presence  =>  true    validates                                  :venue_city,                                                        :presence  =>  {                                                            :if  =>  :venue_partially_set?  }    #  Lots  more  lines  of  validations...    def  address_in_one_line_format;                #  Code  here;  end    def  address_in_multiline_text_format;    #  Code  here;  end    def  address_in_html_format;                        #  Code  here;  end end

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class  Event    include  Pinpoint::Composable    pinpoint  :venue end

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event  =  Event.new(some_sweet_attributes_including_an_address) event.venue.to_s(:one_line) #  =>  'Kwik-­‐E-­‐Mart,  123  Apu  Lane,  Springfield,  NW  12345,  United  States' event.venue.to_s(:multi_line) #  =>  'Kwik-­‐E-­‐Mart #          123  Apu  Lane #          Springfield,  NW  12345 #          United  States' event.venue.to_s(:html) #  =>  '
#               #                  Kwik-­‐E-­‐Mart #               #               #                  123  Apu  Lane #               #               #                  Springfield #                  NW #                  12345 #               #               #                  United  States #               #          
'

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event.venue.to_s(:one_line,  :country  =>  :uk)

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event.venue.to_s(:json)

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Engine Extraction

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What services does my application provide to its users?

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What would I pay someone else to do?

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What services are others creating businesses around?

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When placing an order for tickets, we provide them with a shopping cart that they can use to store their purchase choices and then give them a way to pay for them. Assuming that everything was successful, we send out an email for the receipt and the tickets to the user.

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When placing an order for tickets, we provide them with a shopping cart that they can use to store their purchase choices and then give them a way to pay for them. Assuming that everything was successful, we send out an email for the receipt and the tickets to the user.

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When placing an order for tickets, we provide them with a shopping cart that they can use to store their purchase choices and then give them a way to pay for them. Assuming that everything was successful, we send out an email for the receipt and the tickets to the user.

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When placing an order for tickets, we provide them with a shopping cart that they can use to store their purchase choices and then give them a way to pay for them. Assuming that everything was successful, we send out an email for the receipt and the tickets to the user.

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When placing an order for tickets, we provide them with a shopping cart that they can use to store their purchase choices and then give them a way to pay for them. Assuming that everything was successful, we send out an email for the receipt and the tickets to the user.

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When placing an order for tickets, we provide them with a shopping cart that they can use to store their purchase choices and then give them a way to pay for them. Assuming that everything was successful, we send out an email for the receipt and the tickets to the user.

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$ rails plugin new ticketing --mountable

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create README.rdoc create Rakefile create ticketing.gemspec create MIT-LICENSE create .gitignore create Gemfile create app create app/controllers/ticketing/application_controller.rb create app/helpers/ticketing/application_helper.rb create app/views/layouts/ticketing/application.html.erb create app/assets/images/ticketing create app/assets/images/ticketing/.gitkeep create config/routes.rb create lib/ticketing.rb create lib/tasks/ticketing_tasks.rake create lib/ticketing/version.rb create lib/ticketing/engine.rb create app/assets/stylesheets/ticketing/application.css create app/assets/javascripts/ticketing/application.js create script create script/rails create test/test_helper.rb create test/ticketing_test.rb append Rakefile create test/integration/navigation_test.rb vendor_app test/dummy

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create README.rdoc create Rakefile create ticketing.gemspec create MIT-LICENSE create .gitignore create Gemfile create app create app/controllers/ticketing/application_controller.rb create app/helpers/ticketing/application_helper.rb create app/views/layouts/ticketing/application.html.erb create app/assets/images/ticketing create app/assets/images/ticketing/.gitkeep create config/routes.rb create lib/ticketing.rb create lib/tasks/ticketing_tasks.rake create lib/ticketing/version.rb create lib/ticketing/engine.rb create app/assets/stylesheets/ticketing/application.css create app/assets/javascripts/ticketing/application.js create script create script/rails create test/test_helper.rb create test/ticketing_test.rb append Rakefile create test/integration/navigation_test.rb vendor_app test/dummy

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create README.rdoc create Rakefile create ticketing.gemspec create MIT-LICENSE create .gitignore create Gemfile create app create app/controllers/ticketing/application_controller.rb create app/helpers/ticketing/application_helper.rb create app/views/layouts/ticketing/application.html.erb create app/assets/images/ticketing create app/assets/images/ticketing/.gitkeep create config/routes.rb create lib/ticketing.rb create lib/tasks/ticketing_tasks.rake create lib/ticketing/version.rb create lib/ticketing/engine.rb create app/assets/stylesheets/ticketing/application.css create app/assets/javascripts/ticketing/application.js create script create script/rails create test/test_helper.rb create test/ticketing_test.rb append Rakefile create test/integration/navigation_test.rb vendor_app test/dummy

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create README.rdoc create Rakefile create ticketing.gemspec create MIT-LICENSE create .gitignore create Gemfile create app create app/controllers/ticketing/application_controller.rb create app/helpers/ticketing/application_helper.rb create app/views/layouts/ticketing/application.html.erb create app/assets/images/ticketing create app/assets/images/ticketing/.gitkeep create config/routes.rb create lib/ticketing.rb create lib/tasks/ticketing_tasks.rake create lib/ticketing/version.rb create lib/ticketing/engine.rb create app/assets/stylesheets/ticketing/application.css create app/assets/javascripts/ticketing/application.js create script create script/rails create test/test_helper.rb create test/ticketing_test.rb append Rakefile create test/integration/navigation_test.rb vendor_app test/dummy

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$ git push origin master

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gem  'ticketing',        :git  =>  'git://path/to/my/git/repo.git'

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Lorem Ipsum Dolor Event Amet Consectetur Adipiscing Elit Vestibulum Lobortis DiscountCode Quis Est Gravida Posuere Aliquam Sit Amet Justo Leo In Facilisis Mi TicketType Diam Rutrum Vel Malesuada Ticket Dignissim

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Lorem Ipsum Dolor Event Amet Consectetur Adipiscing Elit Vestibulum Lobortis DiscountCode Quis Est Gravida Posuere Aliquam Sit Amet Justo Leo In Facilisis Mi TicketType Diam Rutrum Vel Malesuada Ticket Dignissim

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Lorem Ipsum Dolor Event Amet Consectetur Adipiscing Elit Vestibulum Lobortis DiscountCode Quis Est Gravida Posuere Aliquam Sit Amet Justo Leo In Facilisis Mi TicketType Diam Rutrum Vel Malesuada Ticket Dignissim

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Lorem Ipsum Dolor Event Amet Consectetur Adipiscing Elit Vestibulum Lobortis DiscountCode Quis Est Gravida Posuere Aliquam Sit Amet Justo Leo In Facilisis Mi TicketType Diam Rutrum Vel Malesuada Ticket Dignissim

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Lorem Ipsum Dolor Event Amet Consectetur Adipiscing Elit Vestibulum Lobortis DiscountCode Quis Est Gravida Posuere Aliquam Sit Amet Justo Leo In Facilisis Mi TicketType Diam Rutrum Vel Malesuada Ticket Dignissim

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main/app/models/event.rb main/app/models/discount_code.rb main/app/models/ticket_type.rb main/app/models/ticket.rb ticketing/app/models/event.rb ticketing/app/models/discount_code.rb ticketing/app/models/ticket_type.rb ticketing/app/models/ticket.rb

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main/spec/models/event_spec.rb main/spec/models/discount_code_spec.rb main/spec/models/ticket_type_spec.rb main/spec/models/ticket_spec.rb ticketing/spec/models/event_spec.rb ticketing/spec/models/discount_code_spec.rb ticketing/spec/models/ticket_type_spec.rb ticketing/spec/models/ticket_spec.rb

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Muddied Boundaries

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User

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Ticketing Main Invoicing User

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it  ‘can  determine  its  account  balance’  do    #  Spec  here end

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Ticketing Main Invoicing User

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Ticketing Main Invoicing User Invoice

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email encrypted_password password_salt reset_password_token remember_token remember_created_at sign_in_count current_sign_in_at last_sign_in_at current_sign_in_ip last_sign_in_ip confirmation_token confirmed_at confirmation_sent_at created_at updated_at billing_first_name billing_last_name authentication_token public_email address_street_and_premises address_city address_state_or_province address_postal_code phone_number billing_address_street_and_premises billing_address_city billing_address_state_or_province billing_address_postal_code billing_phone_number name logo description address_name billing_address_name

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Ticketing Main Invoicing User Invoice

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Ticketing Main Invoicing Invoice Account EventOrganizer User

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Ticketing Main Invoicing Invoice Event Organizer Account User

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Invoicing Ticketing Main Invoice Event Organizer Account User

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email encrypted_password password_salt reset_password_token remember_token remember_created_at sign_in_count current_sign_in_at last_sign_in_at current_sign_in_ip last_sign_in_ip confirmation_token confirmed_at confirmation_sent_at created_at updated_at billing_first_name billing_last_name authentication_token public_email address_street_and_premises address_city address_state_or_province address_postal_code phone_number billing_address_street_and_premises billing_address_city billing_address_state_or_province billing_address_postal_code billing_phone_number name logo description address_name billing_address_name

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Creating the Interface

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class  TicketsController  <  ApplicationController    #  Removed  code    def  create        event              =  Event.find(params[:event_id])        ticket_type  =  TicketType.find(params[:ticket_type_id])        params[:quantity].to_i.times  do            #  Create  the  Ticket            #  Apply  Discount  Codes            #  Send  Emails        end        redirect_to  some_other_path    end    #  Removed  code end

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class  TicketsController  <  ApplicationController    #  Removed  code    def  create        event              =  Event.find(params[:event_id])        ticket_type  =  TicketType.find(params[:ticket_type_id])        params[:quantity].to_i.times  do            #  Create  the  Ticket            #  Apply  Discount  Codes            #  Send  Emails        end        redirect_to  some_other_path    end    #  Removed  code end

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class  TicketsController  <  ApplicationController    #  Removed  code    def  create        event              =  Event.find(params[:event_id])        ticket_type  =  TicketType.find(params[:ticket_type_id])        params[:quantity].to_i.times  do            #  Create  the  Ticket            #  Apply  Discount  Codes            #  Send  Emails        end        redirect_to  some_other_path    end    #  Removed  code end

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class  TicketsController  <  ApplicationController    #  Removed  code    def  create        event              =  Event.find(params[:event_id])        ticket_type  =  TicketType.find(params[:ticket_type_id])        params[:quantity].to_i.times  do            #  Create  the  Ticket            #  Apply  Discount  Codes            #  Send  Emails        end        redirect_to  some_other_path    end    #  Removed  code end

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class  TicketsController  <  ApplicationController    #  Removed  code    def  create        event              =  Event.find(params[:event_id])        ticket_type  =  TicketType.find(params[:ticket_type_id])        params[:quantity].to_i.times  do            #  Create  the  Ticket            #  Apply  Discount  Codes            #  Send  Emails        end        redirect_to  some_other_path    end    #  Removed  code end

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class  TicketsController  <  ApplicationController    #  Removed  code    def  create        event              =  Event.find(params[:event_id])        ticket_type  =  TicketType.find(params[:ticket_type_id])        params[:quantity].to_i.times  do            #  Create  the  Ticket            #  Apply  Discount  Codes            #  Send  Emails        end        redirect_to  some_other_path    end    #  Removed  code end

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class  TicketsController  <  ApplicationController    #  Removed  code    def  create        BoxOffice.register_tickets(  type:                              params[:ticket_type_id]                                                                quantity:                      params[:quantity],                                                                send_notifications:  true)        redirect_to  some_other_path    end    #  Removed  code end

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class  TicketsController  <  ApplicationController    #  Removed  code    def  create        BoxOffice.register_tickets(  type:                              params[:ticket_type_id]                                                                quantity:                      params[:quantity],                                                                send_notifications:  true)        redirect_to  some_other_path    end    #  Removed  code end

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class  TicketsController  <  ApplicationController    #  Removed  code    def  create        BoxOffice.register_tickets(  type:                              params[:ticket_type_id]                                                                quantity:                      params[:quantity],                                                                send_notifications:  true)        redirect_to  some_other_path    end    #  Removed  code end

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Progress Check

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Engines Gems Total Test Time: ~ 2.5 minutes Average Per-Gem Test Time: ~ 4 seconds

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semver.org

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Step 3: Profit

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Main Ticketing Invoicing User Ticketing Ticketing Load Balancer

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Conclusion

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Image Credits https://secure.flickr.com/photos/lwr/168150955/in/photostream/ http://alleverestnepal.files.wordpress.com/2011/07/everest-summit-view.jpg http://www.engineeringwellness.com/wp-content/uploads/2013/02/bigstock-Child-Listening-19669727.jpg http://www.parentspartner.com/wp-content/uploads/2011/05/angry-girl.jpg http://www.buriedwithchildren.com/wp-content/uploads/2010/02/DSCN3428.jpg http://fc08.deviantart.net/fs70/f/2012/038/2/d/1980__s___cartoon_a_gasim___by_timswit-d4p0eta.jpg http://www.pachd.com/free-images/household-images/20-dollar-bill-01.jpg http://cdn.madamenoire.com/wp-content/uploads/2011/10/Creepy-Guy.jpg http://images.wikia.com/lionking/images/c/c2/Simba_amazed.jpeg http://www.o5demo.com/userfiles/Aerial%20view4.jpg http://www.propstore.com/img/products/182/Waynes%20World_Garth%20Glasses.jpg https://kodequirks.files.wordpress.com/2010/05/fail.png?w=640 http://www.hotforsecurity.com/wp-content/uploads/2013/01/ruby-on-rails-steams-critical-security-patch.jpg http://iphonewallpapers-hd.com/walls/travel_for_kids_mac_train_wallpapers_rail_trip-other.jpg https://images-na.ssl-images-amazon.com/images/G/01/dvd/lionsgate/Thomas2_lg.jpg http://www.vacationrentalmarketingblog.com/wp-content/uploads/2012/06/12969446611855980761do-not-symbol.jpg http://www.mostphotos.com/preview/389643/3d-ruby-gem-isolated.jpg http://thumbs.imagekind.com/member/3730ab28-65ec-4744-a89a-a36f0f6282bb/uploadedartwork/650X650/9c4774b8-b41a-4896-bef7-0c65ec7c9825.jpg http://www2.2space.net/images/upl_news/111017/386382/full/%26%23039%3Bsesame-street%26%23039%3B-back-online-after-porn-hacking.jpg https://www.library.qut.edu.au/blog/wp-content/uploads/2011/10/UN_flags_access_copy1.jpg http://www.hobbeslives.com/wp-content/uploads/2013/02/jigsaw-puzzle-2.jpg https://emilyrudisill.files.wordpress.com/2011/06/dsc04539.jpg https://lh3.ggpht.com/_WJjc0N1hIH4/S9ohkRZnDBI/AAAAAAAAK6M/0L-nWy8qsTs/s1600/old+ticket+stub.JPG http://theinsuranceblogger.co.uk/wp-content/uploads/2011/03/black-box.jpg http://raedevelopment.com/wp-content/uploads/2012/09/team-hands1.jpg https://krivstudiosblog.files.wordpress.com/2008/08/stephanie_michelle05.jpg http://zachandjody.com/blog/wp-content/uploads/2010/08/Kid-Stuffing-Face.jpg http://img1.etsystatic.com/005/1/6446101/il_fullxfull.383264621_3lm4.jpg http://www.whatsupyasieve.com/wp-content/uploads/2012/09/sad-panda.jpg http://remixacupuncture.com/wp-content/uploads/2013/05/ren-and-stimpy-1-745973.jpg https://lh3.ggpht.com/-uor9A9sz6xU/UZD4hwwnoEI/AAAAAAAAAnI/sXgYd4u946o/s1600/evildead2bdcap2_original.jpg https://lh3.ggpht.com/-L6z1kIIhPkc/T8wFQ_BdIDI/AAAAAAAABxU/42mDrQkAeqo/s1600/1%2Ba%2Ba%2Ba%2Btl%2Batirando.jpg http://michaelpiggott.files.wordpress.com/2012/12/thunder-buddies.jpg

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Thanks! Jeff Felchner @jfelchner