Refreshing GAM with Adsense backup

[csdude55]

I use a somewhat complicated system to first show ads from Google Ad Manager, and then if there's nothing there then it loads Adsense. If there's still nothing there, I show a direct sold ad.

It looks like this:

googletag.cmd.push(function() {
 // do all of the stuff to show GAM ads
});

var interval = setInterval(() => {
 if (document.readyState === 'complete') {
  clearInterval(interval);

  // do all the stuff to show Adsense, or direct sale
 }
}, 500);

Now I'm thinking about refreshing those GAM ads to see if I can increase revenue any. But the issue there is that I'm not sure if the ad unit is filled with GAM, Adsense, or the direct sale! So what I really need to do is clear the ad unit no matter what's there, then start it over.

Is it acceptable to wrap the whole thing in a setInterval? Nesting a setInterval inside of another setInterval looks hacky as all get out, but it doesn't throw an error.

var x = 0;

setInterval(() => {
 if (x)
  // this clears the GAM slot, but how would I clear it if it's filled with Adsense?
  googletag.cmd.push(function() {
   googletag.pubads().clear();
  });

 x = 1;

 googletag.cmd.push(function() {
  // do all of the stuff to show GAM ads
 });

 var interval = setInterval(() => {
  if (document.readyState === 'complete') {
   clearInterval(interval);

   // do all the stuff to show Adsense, or direct sale
  }
 }, 500);
}, 45000);