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function MemoryCache() {
this.cache = {};
this.size = 0;
}
/**
*
* @param {string} key Key to store cache as
* @param {any} value Value to store
* @param {number} time Time to store for
* @param {function(any, string)} timeoutCallback Callback to call in
* case of timeout
* @returns {Object}
*/
MemoryCache.prototype.add = function (key, value, time, timeoutCallback) {
let old = this.cache[key];
let instance = this;
let entry = {
value: value,
expire: time + Date.now(),
timeout: setTimeout(function () {
instance.delete(key);
return timeoutCallback && typeof timeoutCallback === "function" && timeoutCallback(value, key);
}, time)
};
this.cache[key] = entry;
this.size = Object.keys(this.cache).length;
return entry;
};
/**
* Delete a cache entry
* @param {string} key Key to delete
* @returns {null}
*/
MemoryCache.prototype.delete = function (key) {
let entry = this.cache[key];
if (entry) {
clearTimeout(entry.timeout);
}
delete this.cache[key];
this.size = Object.keys(this.cache).length;
return null;
};
/**
* Get value of key
* @param {string} key
* @returns {Object}
*/
MemoryCache.prototype.get = function (key) {
let entry = this.cache[key];
return entry;
};
/**
* Get value of cache entry
* @param {string} key
* @returns {any}
*/
MemoryCache.prototype.getValue = function (key) {
let entry = this.get(key);
return entry && entry.value;
};
/**
* Clear cache
* @returns {boolean}
*/
MemoryCache.prototype.clear = function () {
Object.keys(this.cache).forEach(function (key) {
this.delete(key);
}, this);
return true;
};
module.exports = MemoryCache;
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