    # File lib/fog/xenserver/compute.rb, line 74
            def initialize(options={})
              @host        = options[:xenserver_url]
              @username    = options[:xenserver_username]
              @password    = options[:xenserver_password]
              @defaults    = options[:xenserver_defaults] || {}
              @connection  = Fog::XenServer::Connection.new(@host)
              @connection.authenticate(@username, @password)
            end