publisher.rb

class Publisher < ActiveRecord::Base
  def with_braintree
    self.class.braintree_mutex.synchronize do
      setup_braintree
      yield
    end
  end

  def setup_braintree
    Braintree::Configuration.environment  = CONFIG.braintree_environment
    Braintree::Configuration.merchant_id  = merchant_id
    Braintree::Configuration.public_key   = public_key
    Braintree::Configuration.private_key  = private_key
  end

  private

  def self.braintree_mutex
    @braintree_mutex ||= Mutex.new
  end
end