Feature/connect cancel (#74)

* Implemented connection cancellation

* Made connect requests return immediately and created a separate connection complete notification

* Fix spelling

* Fix sorting

* Add separate lock for cancellation source map

src/Microsoft.SqlTools.ServiceLayer/Connection/Contracts/CancelConnectParams.cs

@@ -0,0 +1,19 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+namespace Microsoft.SqlTools.ServiceLayer.Connection.Contracts
+{
+    /// <summary>
+    /// Parameters for the Cancel Connect Request.
+    /// </summary>
+    public class CancelConnectParams
+    {
+        /// <summary>
+        /// A URI identifying the owner of the connection. This will most commonly be a file in the workspace
+        /// or a virtual file representing an object in a database.         
+        /// </summary>
+        public string OwnerUri { get; set;  }
+    }
+}

src/Microsoft.SqlTools.ServiceLayer/Connection/Contracts/CancelConnectRequest.cs

@@ -0,0 +1,19 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using Microsoft.SqlTools.ServiceLayer.Hosting.Protocol.Contracts;
+
+namespace Microsoft.SqlTools.ServiceLayer.Connection.Contracts
+{
+    /// <summary>
+    /// Cancel connect request mapping entry 
+    /// </summary>
+    public class CancelConnectRequest
+    {
+        public static readonly
+            RequestType<CancelConnectParams, bool> Type =
+            RequestType<CancelConnectParams, bool>.Create("connection/cancelconnect");
+    }
+}

src/Microsoft.SqlTools.ServiceLayer/Connection/Contracts/ConnectionCompleteNotification.cs

@@ -3,13 +3,21 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
+using Microsoft.SqlTools.ServiceLayer.Hosting.Protocol.Contracts;
+
 namespace Microsoft.SqlTools.ServiceLayer.Connection.Contracts
 {
     /// <summary>
-    /// Message format for the connection result response
+    /// Parameters to be sent back with a connection complete event
     /// </summary>
-    public class ConnectResponse
+    public class ConnectionCompleteParams
     {
+        /// <summary>
+        /// A URI identifying the owner of the connection. This will most commonly be a file in the workspace
+        /// or a virtual file representing an object in a database.         
+        /// </summary>
+        public string OwnerUri { get; set;  }
+
         /// <summary>
         /// A GUID representing a unique connection ID
         /// </summary>
@@ -40,4 +48,14 @@ namespace Microsoft.SqlTools.ServiceLayer.Connection.Contracts
         /// </summary>
         public ConnectionSummary ConnectionSummary { get; set; }
     }
+
+    /// <summary>
+    /// ConnectionComplete notification mapping entry 
+    /// </summary>
+    public class ConnectionCompleteNotification
+    {
+        public static readonly 
+            EventType<ConnectionCompleteParams> Type =
+            EventType<ConnectionCompleteParams>.Create("connection/complete");
+    }
 }

src/Microsoft.SqlTools.ServiceLayer/Connection/Contracts/ConnectionRequest.cs

@@ -13,7 +13,7 @@ namespace Microsoft.SqlTools.ServiceLayer.Connection.Contracts
     public class ConnectionRequest
     {
         public static readonly
-            RequestType<ConnectParams, ConnectResponse> Type =
-            RequestType<ConnectParams, ConnectResponse>.Create("connection/connect");
+            RequestType<ConnectParams, bool> Type =
+            RequestType<ConnectParams, bool>.Create("connection/connect");
     }
 }