You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: handler.rb
    path of file: ./repos/pakyow/frameworks/ui/lib/pakyow/ui
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require "pakyow/connection"

require "pakyow/data/proxy"
require "pakyow/data/sources/ephemeral"

require "pakyow/realtime/channel"

require_relative "recordable"

module Pakyow
  module UI
    # @api private
    class Handler
      def initialize(app)
        @app = app
      end

      def c
    
      def call(args, subscription: nil, result: nil)
        renderer = Marshal.restore(args[:metadata])[:renderer]
        renderer.presentables[:__ui_transform] = true

        # If an ephemeral caused the update, replace the value for any matching presentables.
        #
        if result.is_a?(Data::Sources::Ephemeral)
          renderer.presentables.each do |key, value|
            if value.is_a?(Data::Proxy) && value.source.is_a?(Data::Sources::Ephemeral) && value.source.type == result.type && value.source.qualifications == result.qualifications
              value.instance_variable_set(:@source, result)
            end
          end