def attr_configurable_buffer nm
      attr_configurable_class(nm,
        :default => OnStomp::Failover::Buffers::Written) do |b|
        b || OnStomp::Failover::Buffers::Written
      end
    end
def attr_configurable_buffer nm
      attr_configurable_class(nm,
        :default => OnStomp::Failover::Buffers::Written) do |b|
        b || OnStomp::Failover::Buffers::Written
      end
    end
Creates a readable and writeable attribute with the given name that
 defaults to the {OnStomp::Failover::Buffers::Written}. Corresponds
 the the class to use for frame buffering and de-buffering.
 @param [Symbol] nm name of attribute