how to refresh the map automatically

I am using OL3 and geoserver and postgis as database. My database is connected to geoserver and OL3 conected to geoserver and reads the points in database as vector layer and shows on the map. my data are changed each 5 second (position of points). I want refresh the map automatically each 5 second to show the movement of the points. is there any way to do this?