cache.js
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cache.js
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	/* This module defines several types of cache classes to use in other
	* modules.
	* The interface, that all types use, is kept synchronous driven by current
	* usage patterns, but will need to be revisited in case usage patterns
	* suggest we need asynchronous caches.
	*/

	/**
	* In memory cache implementation
	*
	* @class MemoryCache
	* @private
	*/
	function MemoryCache() {
	this._cache = {};
	}

	/**
	* Retrieve a cached value from a key
	*
	* @memberof MemoryCache
	* @instance
	* @param {string} key
	* @return {any}
	*/
	MemoryCache.prototype.get = function ( key ) {
	return this._cache[ key ];
	};

	/**
	* Cache a value by key
	*
	* @memberof MemoryCache
	* @instance
	* @param {string} key
	* @param {any} value
	*/
	MemoryCache.prototype.set = function ( key, value ) {
	this._cache[ key ] = value;
	};

	/**
	* Null object cache implementation
	*
	* @class NoCache
	*/
	function NoCache() { }

	/**
	* NoOp
	*
	* @memberof NoCache
	* @instance
	*/
	NoCache.prototype.get = function () { };

	/**
	* NoOp
	*
	* @memberof NoCache
	* @instance
	*/
	NoCache.prototype.set = function () { };

	module.exports = {
	MemoryCache,
	NoCache
	};