Asynchronous cache failover example

DRY

// asynchronous version
asynchronousCache.get("id:3244", function(err, myThing) {
  if (myThing == null) {
    asynchronousDB.query("SELECT * from something WHERE id = 3244", function(err, myThing) {
      // We now have a thing from DB, do something with result
      doSomething(myThing);
    });

  } else {
    // We have a thing from cache, do something with result
    doSomething(myThing);
  }

});


function doSomething(myThing) {
   // gee that wasn't so hard, was it
}