gistfile1.rb

module AbstractMatcher

  def summary
    raise NotImplementedError, "implement a matcher with the following semantics...."
  end
end

class YouTubeMatcher
  include AbstractMatcher

  def summary
    puts "youtube matcher"
  end
end

class VimeoMatcher
  include AbstractMatcher

  def summary
    puts "vimeo matcher"
  end
end

class Visit
  
  def initialize(url, matcher)
    @matcher = matcher
  end

  def summary
    @matcher.summary
  end
end

class MatcherFactory

  def get_matcher(url)
    # choosing matcher logic
  end

end