my nonblocking, threadsafe file writer/appender for nodejs. works great with clustered servers, and child processes that write to shared or static file-stores

scribbles.js

//scribbles.js

var fs = require('fs'),
    pth = require('path'),
	cueMngr = {};

function Scribbles(fileNm) {
	this.handle = fileNm;
	this.canWrite = false;
	this.actionsRoster = [];
};

var scribbles = Scribbles.prototype;

scribbles.action = function (err, dta, actionCue) {
	if (err) {
		throw err;
	}
	return actionCue();
}

scribbles.assign = function (func) {
	this.action = func;
	return this;
}

scribbles.scribble = function (dta, func) {
	if (this.canWrite) {
		this.actionCue = dta;
		if (func) {
			this.actionsRoster.push(func);
		}
	} 
	else {
		this.canWrite = true;
		var slf = this,
			taskProxy = {};
		fs.appendFile(this.handle, dta, function (err) {
			function actionCue() {
				slf.canWrite = false;
				if (slf.actionCue) {
					var dta = slf.actionCue;
					slf.scribble(dta);
					slf.actionCue = null;
				}
			}
			slf.action(err, dta, actionCue);
			while (taskProxy = slf.actionsRoster.shift()) {
				return taskProxy(err);
			}
			if (func) {
				return func(err);
			}
		});
	}
	return this;
};

module.exports = function (fil) {
	var nm = pth.resolve(fil);
	return (cueMngr[nm] = cueMngr[nm] || new Scribbles(fil));
}