af:poll component .

if there is a requirement like , you need to show some values dynamicaaly for every span of interval ,
in that case , this af:poll component works superbly.

in this af:poll component , we need to mention the values like
poll Listener : < a method biniding> (if you want to execute an action for every poll time).
interval time : < value  in milli seconds >

so denpending on the interval time , the method binding will execute and update the values in UI / Backing Bean / AM . e.t.c where ever you want depending on your requirement.

some times partial triggers on this poll component won't work  , and mainly outputText component won't work , on that time , surround that components with any panel group and programatically execute the parital trigger on that .

sample code : 

AdfFacesContext adfContext = AdfFacesContext.getCurrentInstance();


adfContext.addPartialTarget(this.panelGroup); // not only panel group what ever the component you want to update in UI.