persistent-harmony

A node.js wrapper class to create persistent javascript objects, relying on harmony proxies.

Rationale / use case

I developed this module because:

• I was generating big hashmaps / associative arrays in node.js, indexing data computed from my MongoDB database
• I wanted to store the resulting javascript objects to my database so that I could load them back to memory, instead of re-computing the indices at every restart of my node.js app.
• I didn't want to update and query these indices using asynchronous mongodb calls, but use native javascript structures instead (sychronous and fast).

Installation

npm install persistent-harmony

Usage

var ph = require("persistent-harmony");
new ph.MongoPH({/* default mongodb args */}, function(mongoPH){
	var mymap = mongoPH.wrap("mymap", {/* empty object instance */}, function(){
		console.log("mymap is now synchronized to its mongodb collection");
		mymap.first = "coucou"; // => stored as {_id:"first", v:"coucou"} in mongodb
		console.log("myapp", mymap);
	});
});

Don't forget to add the --harmony-proxies when starting node!

node --harmony-proxies tests.js