Active Resource with ConditionalGet using wrest and dalli gems.

active_resource_connection.rb

require 'wrest'
require 'dalli'

module Wrest::Caching
  class Memcached

    def initialize(server_urls=nil, options={})
      @memcached = Dalli::Client.new(server_urls, options)
    end

    def [](key)
      @memcached.get(key)
    end

    def []=(key, value)
      @memcached.set(key, value)
    end

    # should be compatible with Hash - return value of the deleted element.
    def delete(key)
      value = self[key]

      @memcached.delete key
      return value
    end
  end
end


Wrest::Caching.default_store = Wrest::Caching::Memcached.new

module ActiveResource
  class Connection

    # Executes a GET request.
    # Used to get (find) resources.
    # def get(path, headers = {})
    #   with_auth { request(:get, path, build_request_headers(headers, :get, self.site.merge(path))) }
    # end

    def get(path, headers = {})
      result = ActiveSupport::Notifications.instrument("request.active_resource") do |payload|
        payload[:method]      = 'get'
        payload[:request_uri] = "#{site.scheme}://#{site.host}:#{site.port}#{path}"
        payload[:result]      =  with_auth { payload[:request_uri].to_uri.using_memcached.get({}, build_request_headers(headers, :get, self.site.merge(path))) }
      end
      handle_response(result)
    rescue Timeout::Error => e
      raise TimeoutError.new(e.message)
    rescue OpenSSL::SSL::SSLError => e
      raise SSLError.new(e.message)
    end
  end
end