Resovled merge conflicts

platform/commonUI/edit/src/services/TransactionService.js

@@ -0,0 +1,108 @@
+/*****************************************************************************
+ * Open MCT Web, Copyright (c) 2014-2015, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT Web is 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.
+ *
+ * Open MCT Web includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+/*global define*/
+define(
+    [],
+    function() {
+        /**
+         * Implements an application-wide transaction state. Once a
+         * transaction is started, calls to PersistenceCapability.persist()
+         * will be deferred until a subsequent call to
+         * TransactionService.commit() is made.
+         *
+         * @param $q
+         * @constructor
+         */
+        function TransactionService($q, dirtyModelCache) {
+            this.$q = $q;
+            this.transaction = false;
+            this.cache = dirtyModelCache;
+        }
+
+        TransactionService.prototype.startTransaction = function () {
+            if (this.transaction) {
+                throw "Transaction in progress";
+            }
+            this.transaction = true;
+        };
+
+        TransactionService.prototype.isActive = function () {
+            return this.transaction;
+        };
+
+        /**
+         * All persist calls deferred since the beginning of the transaction
+         * will be committed. Any failures will be reported via a promise
+         * rejection.
+         * @returns {*}
+         */
+        TransactionService.prototype.commit = function () {
+            var self = this;
+                cache = this.cache.get();
+
+            function keyToObject(key) {
+                return cache[key];
+            }
+
+            function objectToPromise(object) {
+                return object.getCapability('persistence').persist();
+            }
+
+            return this.$q.all(
+                Object.keys(this.cache)
+                    .map(keyToObject)
+                    .map(objectToPromise))
+                .then(function () {
+                    self.transaction = false;
+                });
+        };
+
+        /**
+         * Cancel the current transaction, replacing any dirty objects from
+         * persistence. Not a true rollback, as it cannot be used to undo any
+         * persist calls that were successful in the event one of a batch of
+         * persists failing.
+         *
+         * @returns {*}
+         */
+        TransactionService.prototype.cancel = function () {
+            var self = this,
+                cache = this.cache.get();
+
+            function keyToObject(key) {
+                return cache[key];
+            }
+
+            function objectToPromise(object) {
+                return object.getCapability('persistence').refresh();
+            }
+
+            return this.$q.all(Object.keys(cache)
+                .map(keyToObject)
+                .map(objectToPromise))
+                .then(function () {
+                    self.transaction = false;
+                });
+        };
+
+        return TransactionService;
+});