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gaia/apps/costcontrol/js/desktop-only/async_storage.js

@@ -0,0 +1,65 @@
+(function(exports) {
+  'use strict';
+
+  const store = new Map();
+
+  function isParentAsyncStorageAvailable() {
+    return !!(window.parent &&
+      window.parent !== window &&
+      window.parent.asyncStorage);
+  }
+
+  function callCallback(value, callback) {
+    if (typeof callback === 'function') {
+      setTimeout(callback.bind(null, value));
+    }
+  }
+
+  Object.defineProperty(exports, 'asyncStorage', {
+    value: {
+      getItem: function asm_getItem(key, callback) {
+        if (isParentAsyncStorageAvailable()) {
+          window.parent.asyncStorage.getItem(key, callback);
+          return;
+        }
+
+        callCallback(store.get(key) || null, callback);
+      },
+      setItem: function asm_setItem(key, value, callback) {
+        if (isParentAsyncStorageAvailable()) {
+          window.parent.asyncStorage.setItem(key, value, callback);
+          return;
+        }
+
+        callCallback(store.set(key, value), callback);
+      },
+      removeItem: function asm_removeItem(key, callback) {
+        if (isParentAsyncStorageAvailable()) {
+          window.parent.asyncStorage.removeItem(key, callback);
+          return;
+        }
+
+        callCallback(store.delete(key), callback);
+      },
+      clear: function asm_clear(callback) {
+        if (isParentAsyncStorageAvailable()) {
+          window.parent.asyncStorage.clear(callback);
+          return;
+        }
+
+        callCallback(store.clear(), callback);
+      },
+      length: function(callback) {
+        if (isParentAsyncStorageAvailable()) {
+          window.parent.asyncStorage.length(callback);
+          return;
+        }
+
+        callCallback(store.size, callback);
+      },
+      key: function() {
+        throw new Error('Not Implemented');
+      }
+    }
+  });
+})(window);