Fix backup service to have multiple backup instances (#396)

* Allow multiple backups per backup service instance

* Add test to run multiple backups

* Update backup cancelTask method signature

* Fix to have multiple backup instances and add more tests

* Address PR comments

* Remove double new lines

* Add Azure check for backup operations

src/Microsoft.SqlTools.ServiceLayer/DisasterRecovery/BackupOperation.cs

@@ -19,7 +19,7 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
     /// <summary>
     /// This class implements backup operations
     /// </summary>
-    public class BackupUtilities : IBackupUtilities
+    public class BackupOperation : IBackupOperation
     {
         private CDataContainer dataContainer;
         private ServerConnection serverConnection;
@@ -94,7 +94,7 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
         /// <summary>
         /// Ctor
         /// </summary>
-        public BackupUtilities()
+        public BackupOperation()
         {               
         }
 
@@ -152,11 +152,12 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
         public void PerformBackup()
         {
             this.backup = new Backup();
+            this.backup.Database = this.backupInfo.DatabaseName;
+            this.backup.Action = this.backupActionType;
+            this.backup.Incremental = this.isBackupIncremental;
             this.SetBackupProps();
-            backup.Database = this.backupInfo.DatabaseName;
+
-            backup.Action = this.backupActionType;
+            if (this.backup.Action == BackupActionType.Files)
-            backup.Incremental = this.isBackupIncremental;
-            if (backup.Action == BackupActionType.Files)
             {
                 IDictionaryEnumerator filegroupEnumerator = this.backupInfo.SelectedFileGroup.GetEnumerator();
                 filegroupEnumerator.Reset();
@@ -169,14 +170,14 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
                     if (currentKey.IndexOf(",", StringComparison.Ordinal) < 0)
                     {
                         // is a file group
-                        backup.DatabaseFileGroups.Add(currentValue);
+                        this.backup.DatabaseFileGroups.Add(currentValue);
                     }
                     else
                     {
                         // is a file
                         int idx = currentValue.IndexOf(".", StringComparison.Ordinal);
                         currentValue = currentValue.Substring(idx + 1, currentValue.Length - idx - 1);
-                        backup.DatabaseFiles.Add(currentValue);
+                        this.backup.DatabaseFiles.Add(currentValue);
                     }
                 }
             }
@@ -187,7 +188,7 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
                 isBackupToUrl = true;
             }
 
-            backup.BackupSetName = this.backupInfo.BackupsetName;
+            this.backup.BackupSetName = this.backupInfo.BackupsetName;
 
             if (false == isBackupToUrl)
             {
@@ -205,19 +206,19 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
                             if ((this.backupDeviceType == BackupDeviceType.Disk && backupDeviceType == constDeviceTypeFile)
                                 || (this.backupDeviceType == BackupDeviceType.Tape && backupDeviceType == constDeviceTypeTape))
                             {
-                                backup.Devices.AddDevice(destName, DeviceType.LogicalDevice);
+                                this.backup.Devices.AddDevice(destName, DeviceType.LogicalDevice);
                             }
                             break;
                         case (int)DeviceType.File:
                             if (this.backupDeviceType == BackupDeviceType.Disk)
                             {
-                                backup.Devices.AddDevice(destName, DeviceType.File);
+                                this.backup.Devices.AddDevice(destName, DeviceType.File);
                             }
                             break;
                         case (int)DeviceType.Tape:
                             if (this.backupDeviceType == BackupDeviceType.Tape)
                             {
-                                backup.Devices.AddDevice(destName, DeviceType.Tape);
+                                this.backup.Devices.AddDevice(destName, DeviceType.Tape);
                             }
                             break;
                     }
@@ -225,15 +226,15 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
             }
 
             //TODO: This should be changed to get user inputs
-            backup.FormatMedia = false;
+            this.backup.FormatMedia = false;
-            backup.Initialize = false;
+            this.backup.Initialize = false;
-            backup.SkipTapeHeader = true;
+            this.backup.SkipTapeHeader = true;
-            backup.Checksum = false;
+            this.backup.Checksum = false;
-            backup.ContinueAfterError = false;
+            this.backup.ContinueAfterError = false;
-            backup.LogTruncation = BackupTruncateLogType.Truncate;
+            this.backup.LogTruncation = BackupTruncateLogType.Truncate;
 
             // Execute backup
-            backup.SqlBackup(this.dataContainer.Server);
+            this.backup.SqlBackup(this.dataContainer.Server);
         }
 
         /// <summary>
@@ -278,20 +279,11 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
         /// </summary>
         private bool BackupToUrlSupported()
         {
-            return BackupRestoreBase.IsBackupUrlDeviceSupported(this.dataContainer.Server.PingSqlServerVersion(this.dataContainer.ServerName)); //@@ originally, DataContainer.Server.ServerVersion
+            return BackupRestoreBase.IsBackupUrlDeviceSupported(this.dataContainer.Server.PingSqlServerVersion(this.dataContainer.ServerName));
         }
 
         #endregion
 
-        private string GetDefaultBackupSetName()
-        {
-            string backupName = this.backupInfo.DatabaseName + "-" 
-                + this.backupType.ToString() + " " 
-                + this.backupComponent.ToString() + " " 
-                + BackupConstants.Backup;
-            return backupName;            
-        }
-
         private void SetBackupProps()
         {
             try
@@ -327,7 +319,6 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
                         break;
                     default:
                         break;
-                        //throw new Exception("Unexpected error");
                 }
             }
             catch

src/Microsoft.SqlTools.ServiceLayer/DisasterRecovery/CommonUtilities.cs

@@ -107,8 +107,8 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
         /// <param name="sqlConnection"></param>
         public CommonUtilities(CDataContainer dataContainer, ServerConnection sqlConnection)
         {           
-            this.dataContainer   = dataContainer;
+            this.dataContainer = dataContainer;
-            this.sqlConnection  = sqlConnection;
+            this.sqlConnection = sqlConnection;
             this.excludedDatabases = new ArrayList();
             this.excludedDatabases.Add("master");
             this.excludedDatabases.Add("tempdb");
@@ -202,7 +202,6 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
             }
         }
 
-
         public bool ServerHasLogicalDevices()
         {
             try
@@ -253,7 +252,6 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
             return new string(result);
         }
         
-        
         public RecoveryModel GetRecoveryModel(string databaseName)
         {
             Enumerator en = null;
@@ -275,7 +273,6 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
             return recoveryModel;
         }
 
-
         public string GetRecoveryModelAsString(RecoveryModel recoveryModel)
         {
             string recoveryModelString = string.Empty;
@@ -296,7 +293,6 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
             return recoveryModelString;
         }
 
-
         public string GetDefaultBackupFolder()
         {
             string backupFolder = "";
@@ -571,7 +567,6 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
             return result;
         }
                 
-                
         public bool IsDatabaseOnServer(string databaseName)
         {
             Enumerator en = new Enumerator();
@@ -699,7 +694,6 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
             }
         }
         
-        
         public void GetBackupSetTypeAndComponent(string strType, ref string backupType, ref string backupComponent)
         {           
             string type = strType.ToUpperInvariant();
@@ -816,7 +810,6 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
             return result;
         }
         
-        
         public DataSet GetBackupSetFiles(int backupsetId)
         {
             Enumerator en = new Enumerator();
@@ -853,7 +846,6 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
             return backupset;
         }
         
-        
         public ArrayList GetBackupSetPhysicalSources(int backupsetId)
         {            
             SqlExecutionModes executionMode = this.sqlConnection.SqlExecutionModes;
@@ -902,7 +894,6 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
             return sources;
         }
         
-        
         public RestoreActionType GetRestoreTaskFromBackupSetType(BackupsetType type)
         {
             RestoreActionType result = RestoreActionType.Database;
@@ -952,7 +943,7 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
             }
         }
         
-        public List<RestoreItemSource> GetLatestBackupLocations(string DatabaseName)
+        public List<RestoreItemSource> GetLatestBackupLocations(string databaseName)
         {
             List<RestoreItemSource> latestLocations = new List<RestoreItemSource>();
             Enumerator en = null;
@@ -961,7 +952,7 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
             Request req = new Request();
             en = new Enumerator();
 
-            req.Urn = "Server/BackupSet[@DatabaseName='" + Urn.EscapeString(DatabaseName) + "']";
+            req.Urn = "Server/BackupSet[@DatabaseName='" + Urn.EscapeString(databaseName) + "']";
             req.OrderByList = new OrderBy[1];
             req.OrderByList[0] = new OrderBy();
             req.OrderByList[0].Field = "BackupFinishDate";
@@ -1015,7 +1006,7 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
             return latestLocations;            
         }                       
         
-        public string GetDefaultDatabaseForLogin(string LoginName)
+        public string GetDefaultDatabaseForLogin(string loginName)
         {   
             string defaultDatabase  = string.Empty;
             Enumerator en = new Enumerator();
@@ -1023,7 +1014,7 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
             ds.Locale = System.Globalization.CultureInfo.InvariantCulture;
             Request req = new Request();                                        
             
-            req.Urn = "Server/Login[@Name='"+Urn.EscapeString(LoginName)+"']";
+            req.Urn = "Server/Login[@Name='"+Urn.EscapeString(loginName)+"']";
             req.Fields = new string[1];
             req.Fields[0] = "DefaultDatabase";
             ds = en.Process(this.sqlConnection, req);

src/Microsoft.SqlTools.ServiceLayer/DisasterRecovery/DisasterRecoveryService.cs

@@ -23,23 +23,12 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
     {
         private static readonly Lazy<DisasterRecoveryService> instance = new Lazy<DisasterRecoveryService>(() => new DisasterRecoveryService());
         private static ConnectionService connectionService = null;
-        private IBackupUtilities backupUtilities;
-        private ManualResetEvent backupCompletedEvent = new ManualResetEvent(initialState: false);
 
         /// <summary>
         /// Default, parameterless constructor.
         /// </summary>
         internal DisasterRecoveryService()
         {
-            this.backupUtilities = new BackupUtilities();
-        }
-
-        /// <summary>
-        /// For testing purpose only
-        /// </summary>
-        internal DisasterRecoveryService(IBackupUtilities backupUtilities)
-        {
-            this.backupUtilities = backupUtilities;
         }
 
         /// <summary>
@@ -100,15 +89,11 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
             {
                 DatabaseTaskHelper helper = AdminService.CreateDatabaseTaskHelper(connInfo, databaseExists: true);
                 SqlConnection sqlConn = GetSqlConnection(connInfo);
-                if (sqlConn != null)
+                if ((sqlConn != null) && !connInfo.IsSqlDW && !connInfo.IsAzure)
                 {
-                    DisasterRecoveryService.Instance.InitializeBackup(helper.DataContainer, sqlConn);
+                    BackupConfigInfo backupConfigInfo = DisasterRecoveryService.Instance.GetBackupConfigInfo(helper.DataContainer, sqlConn, sqlConn.Database);
-                    if (!connInfo.IsSqlDW)
+                    backupConfigInfo.DatabaseInfo = AdminService.GetDatabaseInfo(connInfo);
-                    {
+                    response.BackupConfigInfo = backupConfigInfo;
-                        BackupConfigInfo backupConfigInfo = DisasterRecoveryService.Instance.GetBackupConfigInfo(sqlConn.Database);
-                        backupConfigInfo.DatabaseInfo = AdminService.GetDatabaseInfo(connInfo);
-                        response.BackupConfigInfo = backupConfigInfo;
-                    }
                 }
             }
 
@@ -131,11 +116,9 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
             {
                 DatabaseTaskHelper helper = AdminService.CreateDatabaseTaskHelper(connInfo, databaseExists: true);
                 SqlConnection sqlConn = GetSqlConnection(connInfo);
-                if (sqlConn != null)
+                if ((sqlConn != null) && !connInfo.IsSqlDW && !connInfo.IsAzure)
                 {
-                    // initialize backup
+                    BackupOperation backupOperation = DisasterRecoveryService.Instance.SetBackupInput(helper.DataContainer, sqlConn, backupParams.BackupInfo);
-                    DisasterRecoveryService.Instance.InitializeBackup(helper.DataContainer, sqlConn);
-                    DisasterRecoveryService.Instance.SetBackupInput(backupParams.BackupInfo);
 
                     // create task metadata
                     TaskMetadata metadata = new TaskMetadata();
@@ -143,9 +126,10 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
                     metadata.DatabaseName = connInfo.ConnectionDetails.DatabaseName;
                     metadata.Name = SR.Backup_TaskName;
                     metadata.IsCancelable = true;
+                    metadata.Data = backupOperation;
                     
                     // create backup task and perform
-                    SqlTask sqlTask = SqlTaskManager.Instance.CreateTask(metadata, Instance.BackupTask);
+                    SqlTask sqlTask = SqlTaskManager.Instance.CreateTask(metadata, Instance.BackupTaskAsync);
                     sqlTask.Run();
                 }
             }
@@ -179,24 +163,27 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
             return null;
         }
 
-        internal void InitializeBackup(CDataContainer dataContainer, SqlConnection sqlConnection)
+        internal BackupConfigInfo GetBackupConfigInfo(CDataContainer dataContainer, SqlConnection sqlConnection, string databaseName)
         {
-            this.backupUtilities.Initialize(dataContainer, sqlConnection);
+            BackupOperation backupOperation = new BackupOperation();
+            backupOperation.Initialize(dataContainer, sqlConnection);
+            return backupOperation.GetBackupConfigInfo(databaseName);
         }
 
-        internal void SetBackupInput(BackupInfo input)
+        internal BackupOperation SetBackupInput(CDataContainer dataContainer, SqlConnection sqlConnection, BackupInfo input)
         {
-            this.backupUtilities.SetBackupInput(input);
+            BackupOperation backupOperation = new BackupOperation();
+            backupOperation.Initialize(dataContainer, sqlConnection);
+            backupOperation.SetBackupInput(input);
+            return backupOperation;
         }
 
-        internal void PerformBackup()
+        /// <summary>
+        /// For testing purpose only
+        /// </summary>
+        internal void PerformBackup(BackupOperation backupOperation)
         {
-            this.backupUtilities.PerformBackup();
+            backupOperation.PerformBackup();
-        }
-
-        internal BackupConfigInfo GetBackupConfigInfo(string databaseName)
-        {
-            return this.backupUtilities.GetBackupConfigInfo(databaseName);
         }
         
         /// <summary>
@@ -204,23 +191,44 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
         /// </summary>
         /// <param name="sqlTask"></param>
         /// <returns></returns>
-        internal async Task<TaskResult> BackupTask(SqlTask sqlTask)
+        internal async Task<TaskResult> BackupTaskAsync(SqlTask sqlTask)
         {
             sqlTask.AddMessage(SR.Task_InProgress, SqlTaskStatus.InProgress, true);
-            Task<TaskResult> performTask = this.PerformTask();
+            IBackupOperation backupOperation = sqlTask.TaskMetadata.Data as IBackupOperation;
-            Task<TaskResult> cancelTask = this.CancelTask(sqlTask);
+            TaskResult taskResult = null;
-            Task<TaskResult> completedTask = await Task.WhenAny(performTask, cancelTask);
+
-            if (completedTask == performTask)
+            if (backupOperation != null)
             {
-                this.backupCompletedEvent.Set();
+                AutoResetEvent backupCompletedEvent = new AutoResetEvent(initialState: false);
+                Task<TaskResult> performTask = PerformTaskAsync(backupOperation);
+                Task<TaskResult> cancelTask = CancelTaskAsync(backupOperation, sqlTask.TokenSource.Token, backupCompletedEvent);
+                Task<TaskResult> completedTask = await Task.WhenAny(performTask, cancelTask);
+
+                // Release the cancelTask
+                if (completedTask == performTask)
+                {
+                    backupCompletedEvent.Set();
+                }
+
+                sqlTask.AddMessage(completedTask.Result.TaskStatus == SqlTaskStatus.Failed ? completedTask.Result.ErrorMessage : SR.Task_Completed,
+                                   completedTask.Result.TaskStatus);
+                taskResult = completedTask.Result;
+            }
+            else
+            {
+                taskResult = new TaskResult();
+                taskResult.TaskStatus = SqlTaskStatus.Failed;
             }
 
-            sqlTask.AddMessage(completedTask.Result.TaskStatus == SqlTaskStatus.Failed ? completedTask.Result.ErrorMessage : SR.Task_Completed,
+            return taskResult;
-                               completedTask.Result.TaskStatus);
-            return completedTask.Result;
         }
 
-        private async Task<TaskResult> PerformTask()
+        /// <summary>
+        /// Async task to execute backup
+        /// </summary>
+        /// <param name="backupOperation"></param>
+        /// <returns></returns>
+        private async Task<TaskResult> PerformTaskAsync(IBackupOperation backupOperation)
         {
             // Create a task to perform backup
             return await Task.Factory.StartNew(() =>
@@ -228,7 +236,7 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
                 TaskResult result = new TaskResult();
                 try
                 {
-                    this.backupUtilities.PerformBackup();
+                    backupOperation.PerformBackup();
                     result.TaskStatus = SqlTaskStatus.Succeeded;
                 }
                 catch (Exception ex)
@@ -244,14 +252,19 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
             });
         }
 
-        private async Task<TaskResult> CancelTask(SqlTask sqlTask)
+        /// <summary>
+        /// Async task to cancel backup
+        /// </summary>
+        /// <param name="backupOperation"></param>
+        /// <param name="token"></param>
+        /// <param name="backupCompletedEvent"></param>
+        /// <returns></returns>
+        private async Task<TaskResult> CancelTaskAsync(IBackupOperation backupOperation, CancellationToken token, AutoResetEvent backupCompletedEvent)
         {
             // Create a task for backup cancellation request
             return await Task.Factory.StartNew(() =>
             {
                 TaskResult result = new TaskResult();
-
-                CancellationToken token = sqlTask.TokenSource.Token;
                 WaitHandle[] waitHandles = new WaitHandle[2]
                 {
                     backupCompletedEvent,
@@ -259,19 +272,17 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
                 };
 
                 WaitHandle.WaitAny(waitHandles);
-                if (token.IsCancellationRequested)
+                try
                 {
-                    try
+                    backupOperation.CancelBackup();
-                    {
+                    result.TaskStatus = SqlTaskStatus.Canceled;
-                        this.backupUtilities.CancelBackup();
-                        result.TaskStatus = SqlTaskStatus.Canceled;
-                    }
-                    catch (Exception ex)
-                    {
-                        result.TaskStatus = SqlTaskStatus.Failed;
-                        result.ErrorMessage = ex.Message;
-                    }
                 }
+                catch (Exception ex)
+                {
+                    result.TaskStatus = SqlTaskStatus.Failed;
+                    result.ErrorMessage = ex.Message;
+                }
+                
                 return result;
             });
         }

src/Microsoft.SqlTools.ServiceLayer/DisasterRecovery/IBackupOperation.cs

@@ -2,6 +2,7 @@
 // Copyright (c) Microsoft. All rights reserved.
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
+using Microsoft.SqlServer.Management.Smo;
 using Microsoft.SqlTools.ServiceLayer.Admin;
 using Microsoft.SqlTools.ServiceLayer.DisasterRecovery.Contracts;
 using System.Data.SqlClient;
@@ -11,7 +12,7 @@ namespace Microsoft.SqlTools.ServiceLayer.DisasterRecovery
     /// <summary>
     /// Interface for backup operations
     /// </summary>
-    public interface IBackupUtilities
+    public interface IBackupOperation
     {
         /// <summary>
         /// Initialize 

src/Microsoft.SqlTools.ServiceLayer/TaskServices/TaskMetadata.cs

@@ -37,5 +37,10 @@ namespace Microsoft.SqlTools.ServiceLayer.TaskServices
         /// Database name this task is created for
         /// </summary>
         public string DatabaseName { get; set; }
+
+        /// <summary>
+        /// Data required to perform the task
+        /// </summary>
+        public object Data { get; set; }
     }
 }

test/Microsoft.SqlTools.ServiceLayer.IntegrationTests/DisasterRecovery/BackupTests.cs

@@ -57,10 +57,9 @@ namespace Microsoft.SqlTools.ServiceLayer.IntegrationTests.DisasterRecovery
             // Initialize backup service
             DatabaseTaskHelper helper = AdminService.CreateDatabaseTaskHelper(liveConnection.ConnectionInfo, databaseExists: true);
             SqlConnection sqlConn = DisasterRecoveryService.GetSqlConnection(liveConnection.ConnectionInfo);
-            DisasterRecoveryService.Instance.InitializeBackup(helper.DataContainer, sqlConn);
             
             // Get default backup path
-            BackupConfigInfo backupConfigInfo = DisasterRecoveryService.Instance.GetBackupConfigInfo(sqlConn.Database);
+            BackupConfigInfo backupConfigInfo = DisasterRecoveryService.Instance.GetBackupConfigInfo(helper.DataContainer, sqlConn, sqlConn.Database);
             string backupPath = backupConfigInfo.DefaultBackupFolder + "\\" + databaseName + ".bak";
             
             var backupInfo = new BackupInfo();
@@ -81,8 +80,8 @@ namespace Microsoft.SqlTools.ServiceLayer.IntegrationTests.DisasterRecovery
             };
 
             // Backup the database
-            DisasterRecoveryService.Instance.SetBackupInput(backupParams.BackupInfo);
+            BackupOperation backupOperation = DisasterRecoveryService.Instance.SetBackupInput(helper.DataContainer, sqlConn, backupParams.BackupInfo);
-            DisasterRecoveryService.Instance.PerformBackup();
+            DisasterRecoveryService.Instance.PerformBackup(backupOperation);
             
             // Remove the backup file
             if (File.Exists(backupPath))

test/Microsoft.SqlTools.ServiceLayer.UnitTests/DisasterRecovery/BackupOperationStub.cs

@@ -3,6 +3,7 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
+using Microsoft.SqlServer.Management.Smo;
 using Microsoft.SqlTools.ServiceLayer.Admin;
 using Microsoft.SqlTools.ServiceLayer.DisasterRecovery;
 using Microsoft.SqlTools.ServiceLayer.DisasterRecovery.Contracts;
@@ -12,9 +13,9 @@ using System.Threading;
 namespace Microsoft.SqlTools.ServiceLayer.UnitTests.DisasterRecovery
 {
     /// <summary>
-    /// Stub class that implements IBackupUtilities
+    /// Stub class that implements IBackupOperation
     /// </summary>
-    public class BackupUtilitiesStub : IBackupUtilities
+    public class BackupOperationStub : IBackupOperation
     {
         /// <summary>
         /// Initialize 

test/Microsoft.SqlTools.ServiceLayer.UnitTests/DisasterRecovery/BackupTests.cs

@@ -21,14 +21,20 @@ namespace Microsoft.SqlTools.ServiceLayer.UnitTests.DisasterRecovery
             IsCancelable = true
         };
 
+        /// <summary>
+        /// Create and run a backup task
+        /// </summary>
+        /// <returns></returns>
         [Fact]
-        public async Task VerifyCreateAndRunningBackupTask()
+        public async Task VerifyRunningBackupTask()
         {
             using (SqlTaskManager manager = new SqlTaskManager())
             {
-                var mockUtility = new Mock<IBackupUtilities>();
+                DisasterRecoveryService service = new DisasterRecoveryService();
-                DisasterRecoveryService service = new DisasterRecoveryService(mockUtility.Object);
+                var mockBackupOperation = new Mock<IBackupOperation>();
-                SqlTask sqlTask = manager.CreateTask(this.taskMetaData, service.BackupTask);
+                this.taskMetaData.Data = mockBackupOperation.Object;
+                
+                SqlTask sqlTask = manager.CreateTask(this.taskMetaData, service.BackupTaskAsync);
                 Assert.NotNull(sqlTask);
                 Task taskToVerify = sqlTask.RunAsync().ContinueWith(Task =>
                 {
@@ -39,14 +45,51 @@ namespace Microsoft.SqlTools.ServiceLayer.UnitTests.DisasterRecovery
             }
         }
         
+        /// <summary>
+        /// Create and run multiple backup tasks
+        /// </summary>
+        /// <returns></returns>
         [Fact]
-        public async Task CancelBackupTask()
+        public async Task VerifyRunningMultipleBackupTasks()
         {
             using (SqlTaskManager manager = new SqlTaskManager())
             {   
-                IBackupUtilities backupUtility = new BackupUtilitiesStub();                
+                DisasterRecoveryService service = new DisasterRecoveryService();
-                DisasterRecoveryService service = new DisasterRecoveryService(backupUtility);
+                var mockUtility = new Mock<IBackupOperation>();
-                SqlTask sqlTask = manager.CreateTask(this.taskMetaData, service.BackupTask);
+                this.taskMetaData.Data = mockUtility.Object;
+
+                SqlTask sqlTask = manager.CreateTask(this.taskMetaData, service.BackupTaskAsync);
+                SqlTask sqlTask2 = manager.CreateTask(this.taskMetaData, service.BackupTaskAsync);
+                Assert.NotNull(sqlTask);
+                Assert.NotNull(sqlTask2);
+
+                Task taskToVerify = sqlTask.RunAsync().ContinueWith(Task =>
+                {
+                    Assert.Equal(SqlTaskStatus.Succeeded, sqlTask.TaskStatus);
+                });
+
+                Task taskToVerify2 = sqlTask2.RunAsync().ContinueWith(Task =>
+                {
+                    Assert.Equal(SqlTaskStatus.Succeeded, sqlTask2.TaskStatus);
+                });
+
+                await Task.WhenAll(taskToVerify, taskToVerify2);
+            }
+        }
+
+        /// <summary>
+        /// Cancel a backup task
+        /// </summary>
+        /// <returns></returns>
+        [Fact]
+        public async Task VerifyCancelBackupTask()
+        {
+            using (SqlTaskManager manager = new SqlTaskManager())
+            {
+                IBackupOperation backupOperation = new BackupOperationStub();                
+                DisasterRecoveryService service = new DisasterRecoveryService();
+                this.taskMetaData.Data = backupOperation;
+                SqlTask sqlTask = manager.CreateTask(this.taskMetaData, service.BackupTaskAsync);
                 Assert.NotNull(sqlTask);
                 Task taskToVerify = sqlTask.RunAsync().ContinueWith(Task =>
                 {
@@ -59,5 +102,77 @@ namespace Microsoft.SqlTools.ServiceLayer.UnitTests.DisasterRecovery
                 await taskToVerify;
             }
         }
+
+        /// <summary>
+        /// Cancel multiple backup tasks
+        /// </summary>
+        /// <returns></returns>
+        [Fact]
+        public async Task VerifyCancelMultipleBackupTasks()
+        {
+            using (SqlTaskManager manager = new SqlTaskManager())
+            {
+                IBackupOperation backupOperation = new BackupOperationStub();
+                DisasterRecoveryService service = new DisasterRecoveryService();
+                this.taskMetaData.Data = backupOperation;
+                SqlTask sqlTask = manager.CreateTask(this.taskMetaData, service.BackupTaskAsync);
+                SqlTask sqlTask2 = manager.CreateTask(this.taskMetaData, service.BackupTaskAsync);
+                Assert.NotNull(sqlTask);
+                Assert.NotNull(sqlTask2);
+
+                Task taskToVerify = sqlTask.RunAsync().ContinueWith(Task =>
+                {
+                    Assert.Equal(SqlTaskStatus.Canceled, sqlTask.TaskStatus);
+                    Assert.Equal(sqlTask.IsCancelRequested, true);
+                    manager.Reset();
+                });
+
+                Task taskToVerify2 = sqlTask2.RunAsync().ContinueWith(Task =>
+                {
+                    Assert.Equal(SqlTaskStatus.Canceled, sqlTask2.TaskStatus);
+                    Assert.Equal(sqlTask2.IsCancelRequested, true);
+                    manager.Reset();
+                });
+
+                manager.CancelTask(sqlTask.TaskId);
+                manager.CancelTask(sqlTask2.TaskId);
+
+                await Task.WhenAll(taskToVerify, taskToVerify2);
+            }
+        }
+
+        /// <summary>
+        /// Create two backup tasks and cancel one task
+        /// </summary>
+        /// <returns></returns>
+        [Fact]
+        public async Task VerifyCombinationRunAndCancelBackupTasks()
+        {
+            using (SqlTaskManager manager = new SqlTaskManager())
+            {
+                IBackupOperation backupOperation = new BackupOperationStub();
+                DisasterRecoveryService service = new DisasterRecoveryService();
+                this.taskMetaData.Data = backupOperation;
+                SqlTask sqlTask = manager.CreateTask(this.taskMetaData, service.BackupTaskAsync);
+                SqlTask sqlTask2 = manager.CreateTask(this.taskMetaData, service.BackupTaskAsync);
+                Assert.NotNull(sqlTask);
+                Assert.NotNull(sqlTask2);
+
+                Task taskToVerify = sqlTask.RunAsync().ContinueWith(Task =>
+                {
+                    Assert.Equal(SqlTaskStatus.Canceled, sqlTask.TaskStatus);
+                    Assert.Equal(sqlTask.IsCancelRequested, true);
+                    manager.Reset();
+                });
+
+                Task taskToVerify2 = sqlTask2.RunAsync().ContinueWith(Task =>
+                {
+                    Assert.Equal(SqlTaskStatus.Succeeded, sqlTask2.TaskStatus);
+                });
+
+                manager.CancelTask(sqlTask.TaskId);
+                await Task.WhenAll(taskToVerify, taskToVerify2);
+            }
+        }
     }
 }