calculate_next_fire_time (NewRelic::Agent::EventLoop::Timer)

# File lib/new_relic/agent/event_loop.rb, line 34
        def calculate_next_fire_time
          now = Time.now
          return now if @interval == 0
          fire_time = @last_fired_at || now
          while fire_time <= now
            fire_time += @interval
          end
          fire_time
        end