instance method call

# File actionpack/lib/action_dispatch/middleware/session/abstract_store.rb, line 147
      def call(env)
        prepare!(env)
        response = @app.call(env)

        session_data = env[ENV_SESSION_KEY]
        options = env[ENV_SESSION_OPTIONS_KEY]

        if !session_data.is_a?(AbstractStore::SessionHash) || session_data.loaded? || options[:expire_after]
          session_data.send(:load!) if session_data.is_a?(AbstractStore::SessionHash) && !session_data.loaded?

          sid = options[:id] || generate_sid
          session_data = session_data.to_hash

          value = set_session(env, sid, session_data)
          return response unless value

          cookie = { :value => value }
          unless options[:expire_after].nil?
            cookie[:expires] = Time.now + options.delete(:expire_after)
          end

          request = ActionDispatch::Request.new(env)
          set_cookie(request, cookie.merge!(options))
        end

        response
      end