# File lib/aws/simple_workflow/decision_task_collection.rb, line 162
      def poll_for_single_task task_list, options = {}, &block

        client_opts = {}
        client_opts[:domain] = domain.name
        client_opts[:identity] = identity_opt(options)
        client_opts[:task_list] = { :name => task_list }
        client_opts[:maximum_page_size] = options[:event_batch_size] || 1000
        client_opts[:reverse_order] = options.key?(:reverse_event_order) ?
          options[:reverse_event_order] : false

        response = client.poll_for_decision_task(client_opts)

        if response.data['taskToken']
          decision_task = DecisionTask.new(domain, client_opts, response.data)
          if block_given?
            yield(decision_task)
            decision_task.complete! unless decision_task.responded?
            nil
          else
            decision_task
          end
        else
          nil
        end

      end