#816, #817, #818

util/memory-cache.js

@@ -0,0 +1,59 @@
+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