Firebase Circular Buffer

about.md

A circule buffer for firebase. Elements are dequeued and enqueue, and a callback function is run on their dataSnapshot.

buffer.js

var fbRef = new Firebase('https://yourapp.firebaseio.com');
var bufferRef = fbRef.child('path/to/buffer');

function getNext(callback){
	// get single-element list, [x]
	bufferRef.startAt().limit(1).once('value',function(listSnap){
		// get element, x
		listSnap.forEach(function(elementSnap){
			// remove x
			elementSnap.ref().remove(function(error){
				// if no error, place back
				if (!error){
					// push x to end
					bufferRef.push(elementSnap.val());
					// exec callback functions
					callback(elementSnap);
				}
			});
		});
	});
}