Quick and easy expiring cache

quick_cache.js

var cacheData = {},
    ttl = 60000; // default TTL is 60 seconds


// Set the TTL
exports.setTTL = function(val) { ttl = val; };


// Set cache value
exports.set = function(key, value) {
  cacheData[key] = {
    val: value,
    expires: new Date().getTime() + ttl
  };
};


// Get value of cache key.
// Pass 'hit' and 'miss' callbacks in handlers object
exports.get = function(key, handlers) {
  var data = cacheData[key];

  if (data) {
    if (data.expires < new Date().getTime()) {
      // Expired data
      delete cacheData[key];
      if (handlers.miss) { handlers.miss(key); };
    } else {
      if (handlers.hit) { handlers.hit(data.val); };
      return data.val;
    }
  } else {
    if (handlers.miss) { handlers.miss(key); };
  };
}



//////////////////////////////////////////////////////
// Example
// var quickCache = require('quick_cache');
//
// quickCache.get('cache_key', {
//   hit: function (val) {
//     doSomething(val);
//   },
//   miss: function(key) {
//     dbLookup('blah blah blah', function(val) {
//       quickCache.set(key, val);
//       doSomething(val);
//     });
//   };
// })