# encoding: utf-8

module OneApm
  module Agent
    class Harvester

      attr_accessor :starting_pid

      def initialize(events, after_forker = OneApm::Manager)
        @starting_pid = nil
        @after_forker = after_forker

        if events
          events.subscribe(:start_transaction, &method(:on_transaction))
        end
      end

      def on_transaction(*_)
        return unless restart_in_children_enabled? && needs_restart? && harvest_thread_enabled?

        restart_harvest_thread
      end

      def mark_started(pid = Process.pid)
        @starting_pid = pid
      end

      def needs_restart?(pid = Process.pid)
        @starting_pid != pid
      end

      def restart_in_children_enabled?
        OneApm::Manager.config[:restart_thread_in_children]
      end

      def harvest_thread_enabled?
        !OneApm::Manager.config[:disable_harvest_thread]
      end

      def restart_harvest_thread
        @after_forker.after_fork(:force_reconnect => true)
      end
    end
  end
end