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memory.js 

/*
 * memory.js: Simple memory storage engine for nconf configuration(s)
 *
 * (C) 2011, Charlie Robbins
 *
 */

var nconf = require('nconf');

function Memory (options)

@options {Object} Options for this instance

Constructor function for the Memory nconf store which maintains a nested json structure based on key delimiters :.

e.g. my:nested:key ==> { my: { nested: { key: } } } 

var Memory = exports.Memory = function (options) {
  options     = options || {};
  this.store  = {};
  this.mtimes = {};
};

function get (key)

@key {string} Key to retrieve for this instance.

Retrieves the value for the specified key (if any).

 
Memory.prototype.get = function (key) {
  var target = this.store, 
      path   = nconf.path(key);

Scope into the object to get the appropriate nested context

 
  while (path.length > 0) {
    key = path.shift();
    if (!target[key]) {
      return;
    }
    
    target = target[key];
    if (path.length === 0) {
      return target;
    }
  }
};

function set (key, value)

@key {string} Key to set in this instance

@value {literal|Object} Value for the specified key

Sets the value for the specified key in this instance.

 
Memory.prototype.set = function (key, value) {
  var target = this.store, 
      path   = nconf.path(key);

Update the mtime (modified time) of the key

 
  this.mtimes[key] = Date.now();

Scope into the object to get the appropriate nested context

 
  while (path.length > 1) {
    key = path.shift();
    if (!target[key]) {
      target[key] = {};
    }
    
    target = target[key];
  }

Set the specified value in the nested JSON structure

 
  key = path.shift();
  target[key] = value;
  return true;
};

function clear (key)

@key {string} Key to remove from this instance

Removes the value for the specified key from this instance.

 
Memory.prototype.clear = function (key) {
  var target = this.store, 
      path   = nconf.path(key);

Remove the key from the set of mtimes (modified times)

 
  delete this.mtimes[key];

Scope into the object to get the appropriate nested context

 
  while (path.length > 1) {
    key = path.shift();
    if (!target[key]) {
      return;
    }
    
    target = target[key];
  }

Delete the key from the nested JSON structure

 
  key = path.shift();
  delete target[key];
  return true;
};

function reset (callback)

Clears all keys associated with this instance.

 
Memory.prototype.reset = function () {
  this.mtimes = {};
  this.store  = {};
  return true;
}