Initial commit of SqlTools Service API

ServiceHost/Client/LanguageClientBase.cs

@@ -0,0 +1,44 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using Microsoft.PowerShell.EditorServices.Protocol.LanguageServer;
+using Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol;
+using Microsoft.PowerShell.EditorServices.Protocol.MessageProtocol.Channel;
+using System.Threading.Tasks;
+
+namespace Microsoft.PowerShell.EditorServices.Protocol.Client
+{
+    /// <summary>
+    /// Provides a base implementation for language server clients.
+    /// </summary>
+    public abstract class LanguageClientBase : ProtocolEndpoint
+    {
+        /// <summary>
+        /// Initializes an instance of the language client using the
+        /// specified channel for communication.
+        /// </summary>
+        /// <param name="clientChannel">The channel to use for communication with the server.</param>
+        public LanguageClientBase(ChannelBase clientChannel)
+            : base(clientChannel, MessageProtocolType.LanguageServer)
+        {
+        }
+
+        protected override Task OnStart()
+        {
+            // Initialize the implementation class
+            return this.Initialize();
+        }
+
+        protected override async Task OnStop()
+        {
+            // First, notify the language server that we're stopping
+            var response = await this.SendRequest(ShutdownRequest.Type, new object());
+            await this.SendEvent(ExitNotification.Type, new object());
+        }
+
+        protected abstract Task Initialize();
+    }
+}
+