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gaia/shared/js/everythingme/cache.js

@@ -0,0 +1,44 @@
+'use strict';
+/* global Promise*/
+/* global asyncStorage*/
+
+(function(eme) {
+  var PREFIX = 'eme-cache';
+  var slice = Function.call.bind(Array.prototype.slice);
+
+
+  function Cache() { }
+
+  Cache.prototype = {
+    generateKey: function cache_generateKey() {
+      return slice(arguments).map(JSON.stringify).join('|');
+    },
+
+    add: function cache_add(key, value) {
+      return new Promise(function ready(resolve, reject) {
+        asyncStorage.setItem(PREFIX + key, value);
+      });
+    },
+    get: function cache_get(key) {
+      return new Promise(function ready(resolve, reject) {
+        asyncStorage.getItem(PREFIX + key, function onValue(value) {
+          if (value === null) {
+            reject(null);
+          } else {
+            resolve(value);
+          }
+        });
+      });
+    },
+
+    addRequest: function cache_addRequest(service, method, options, response) {
+      this.add(this.generateKey(service, method, options), response);
+    },
+    getRequest: function cache_getRequest(service, method, options) {
+      return this.get(this.generateKey(service, method, options));
+    }
+  };
+
+  eme.Cache = new Cache();
+
+})(window.eme);