herd.js

var map = require("collections/map");
function protectAgainstThunderingHerd(method) {
    var memo = new Map();
    return function protected() {
        var self = this;
        var args = Array.prototype.slice.call(arguments);
        if (!memo.has(args)) {
            memo.set(Q.try(function () {
                return method.apply(this, args);
            }).finally(function () {
                memo.delete(args);
            }));
        }
        return memo.get(args);
    };
};