How to continuously change the forwarding flow table of the switch at intervals？

[dmucby]

My goals are as follows. I intend to change the forwarding flow table of the switch in a period of time to achieve the effect of changing the forwarding path of the data flow. At present, I want to complete the above work by means of event listener, but this effect is not good and the delay is relatively high. I want to ask for a method to achieve the above effect. Of course, the above work is on the P4 switch. Thank you!