Adding Caching Adapter, allows caching of _Role and _User queries (fixes #168) (#1664)

* Adding Caching Adapter, allows caching of _Role and _User queries.

src/RestWrite.js

@@ -2,7 +2,6 @@
 // that writes to the database.
 // This could be either a "create" or an "update".
 
-import cache from './cache';
 var SchemaController = require('./Controllers/SchemaController');
 var deepcopy = require('deepcopy');
 
@@ -310,6 +309,7 @@ RestWrite.prototype.handleAuthData = function(authData) {
   });
 }
 
+
 // The non-third-party parts of User transformation
 RestWrite.prototype.transformUser = function() {
   if (this.className !== '_User') {
@@ -320,7 +320,8 @@ RestWrite.prototype.transformUser = function() {
 
   // If we're updating a _User object, clear the user cache for the session
   if (this.query && this.auth.user && this.auth.user.getSessionToken()) {
-    cache.users.remove(this.auth.user.getSessionToken());
+    let cacheAdapter = this.config.cacheController;
+    cacheAdapter.user.del(this.auth.user.getSessionToken());
   }
 
   return promise.then(() => {
@@ -441,24 +442,6 @@ RestWrite.prototype.handleFollowup = function() {
   }
 };
 
-// Handles the _Role class specialness.
-// Does nothing if this isn't a role object.
-RestWrite.prototype.handleRole = function() {
-  if (this.response || this.className !== '_Role') {
-    return;
-  }
-
-  if (!this.auth.user && !this.auth.isMaster) {
-    throw new Parse.Error(Parse.Error.INVALID_SESSION_TOKEN,
-                          'Session token required.');
-  }
-
-  if (!this.data.name) {
-    throw new Parse.Error(Parse.Error.INVALID_ROLE_NAME,
-                          'Invalid role name.');
-  }
-};
-
 // Handles the _Session class specialness.
 // Does nothing if this isn't an installation object.
 RestWrite.prototype.handleSession = function() {
@@ -716,6 +699,10 @@ RestWrite.prototype.runDatabaseOperation = function() {
     return;
   }
 
+  if (this.className === '_Role') {
+    this.config.cacheController.role.clear();
+  }
+
   if (this.className === '_User' &&
       this.query &&
       !this.auth.couldUpdateUserId(this.query.objectId)) {