process.rb

module SomeDomain
  class SomeProcess < Service
    
    dependency :find_user, Users::Queries::FindByEmail
    dependency :save_user, Users::Commands::Save
    
    def call(email, some_argument)     
      user = find_user.(email)
      
      if user.some_thing?(some_argument)
        user.some_thing(some_argument)
      end
      
      save_user.call(user)
    end

    def self.call(email)
      new.(email)
    end

  end
end




module Users
  module Commands
    class Save

      def call(user)
        user.save
      end

    end
  end
  
  module Queries
    class FindByEmail

      dependency :user_dao, User, static: true

      def call(email)
        user_dao.find_by(email: email)
      end
    end
  end
end