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function MemoryCache() {
this.cache = {}
this.size = 0
}
MemoryCache.prototype.add = function (key, value, time, timeoutCallback) {
var old = this.cache[key]
var instance = this
var 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
}
MemoryCache.prototype.delete = function (key) {
var entry = this.cache[key]
if (entry) {
clearTimeout(entry.timeout)
}
delete this.cache[key]
this.size = Object.keys(this.cache).length
return null
}
MemoryCache.prototype.get = function (key) {
var entry = this.cache[key]
return entry
}
MemoryCache.prototype.getValue = function (key) {
var entry = this.get(key)
return entry && entry.value
}
MemoryCache.prototype.clear = function () {
Object.keys(this.cache).forEach(function (key) {
this.delete(key)
}, this)
return true
}
module.exports = MemoryCache