Hack ActiveResource::Base to support per instance site option

gistfile1.rb

class Runner
  @@nodes = {}

  def self.node(site)
    @@nodes[site] || = self.new_ar(site).new if !@@nodes.has_key?(site)
  end

  def self.new_ar(site)
    Class.new(ActiveResource::Base) do
      self.site = site
      self.element_name = 'runner'

      # your methods here
    end
  end
end

Usage:

remote = Runner.node('http://localhost')
remote.get(...)