Enable HTTP Caching on resources.

This patch enables request caching for specifically addressed
resources. In order to avoid cache expiry, POST/PUT/DELETE requests
trigger a immediate cache update. Furthermore, angular-cache was
added to handle our maxAge expiration, with an expiration time
of one minute. This short time is intended to provide a reasonable
lifespan for each resource - one that both prevents
frequent reloads, but also doesn' tallow the resource to age too
much.

Change-Id: Ibbcb48c20fa99eb287c6543e042268ac8e842e17

bower.json

@@ -11,7 +11,8 @@
     "angular-bootstrap": "0.11.2",
     "angular-local-storage": "0.0.7",
     "angular-elastic": "2.4.0",
-    "angular-moment": "0.8.2"
+    "angular-moment": "0.8.2",
+    "angular-cache": "3.2.2"
   },
   "devDependencies": {
     "angular-mocks": "1.2.25",

src/app/services/http/http_cache_handler.js

@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License. You may obtain
+ * a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+/**
+ * An HTTP request interceptor that pays attention to POST/PUT/DELETE operations
+ * on specific resources, and replaces the local cached data with the resulting
+ * value.
+ */
+angular.module('sb.services').factory('httpCacheHandler',
+    function ($q, $cacheFactory) {
+        'use strict';
+
+        var $httpDefaultCache = $cacheFactory.get('$http');
+
+        return {
+            /**
+             * Handle a success response.
+             */
+            response: function (response) {
+                var method = response.config.method;
+                var url = response.config.url;
+                var obj = response.data;
+
+                // Ignore GET methods.
+                switch (method) {
+                    case 'POST':
+                        if (obj.hasOwnProperty('id')) {
+                            $httpDefaultCache.put(url + '/' + obj.id, obj);
+                        }
+                        break;
+                    case 'PUT':
+                        $httpDefaultCache.put(url, obj);
+                        break;
+                    case 'DELETE':
+                        $httpDefaultCache.remove(url);
+                        break;
+                    default:
+                        break;
+                }
+
+                return response;
+            }
+        };
+    })
+    // Attach the HTTP interceptor.
+    .config(function ($httpProvider) {
+        'use strict';
+        $httpProvider.interceptors.push('httpCacheHandler');
+    });

src/app/services/service/resource_factory.js

@@ -50,7 +50,7 @@ angular.module('sb.services')
                 },
                 'get': {
                     method: 'GET',
-                    cache: false
+                    cache: true
                 },
                 'update': {
                     method: 'PUT'
@@ -62,6 +62,7 @@ angular.module('sb.services')
                     method: 'GET',
                     isArray: true,
                     responseType: 'json',
+                    cache: false,
                     params: {
                         limit: getLimit
                     }
@@ -71,6 +72,7 @@ angular.module('sb.services')
                     url: searchUrl,
                     isArray: true,
                     responseType: 'json',
+                    cache: false,
                     params: {
                         limit: getLimit
                     }

src/app/storyboard/module.js

@@ -26,7 +26,8 @@ angular.module('storyboard',
     [ 'sb.services', 'sb.templates', 'sb.dashboard', 'sb.pages', 'sb.projects',
         'sb.auth', 'sb.story', 'sb.profile', 'sb.notification', 'sb.search',
         'sb.admin', 'sb.subscription', 'sb.project_group', 'ui.router',
-        'ui.bootstrap', 'monospaced.elastic', 'angularMoment'])
+        'ui.bootstrap', 'monospaced.elastic', 'angularMoment',
+        'angular-data.DSCacheFactory'])
     .constant('angularMomentConfig', {
         preprocess: 'utc',
         timezone: 'UTC'
@@ -57,4 +58,16 @@ angular.module('storyboard',
             function () {
                 $state.go('index');
             });
+    })
+    .run(function ($http, DSCacheFactory) {
+        'use strict';
+
+        DSCacheFactory.createCache('defaultCache', {
+            // Items added to this cache expire after 1 minute.
+            maxAge: 60000,
+            // Items will be deleted from this cache only on check.
+            deleteOnExpire: 'passive'
+        });
+
+        $http.defaults.cache = DSCacheFactory.get('defaultCache');
     });

src/index.html

@@ -35,6 +35,7 @@
     <script src="angular-resource/angular-resource.js"></script>
     <script src="angular-local-storage/angular-local-storage.js"></script>
     <script src="angular-sanitize/angular-sanitize.js"></script>
+    <script src="angular-cache/dist/angular-cache.js"></script>
     <script src="moment/moment.js"></script>
     <script src="angular-moment/angular-moment.js"></script>
     <!-- endbuild -->