Add IntelliSense binding queue (#73)

* Initial code for binding queue

* Fix-up some of the timeout wait code

* Add some initial test code

* Add missing test file

* Update the binding queue tests

* Add more test coverage and refactor a bit.  Disable reliabile connection until we can fix it..it's holding an open data reader connection.

* A few more test updates

* Initial integrate queue with language service.

* Hook up the connected binding queue into al binding calls.

* Cleanup comments and remove dead code

* More missing comments

* Fix build break.  Reenable ReliabileConnection.

* Revert all changes to SqlConnectionFactory

* Resolve merge conflicts

* Cleanup some more of the timeouts and sync code

* Address code review feedback

* Address more code review feedback

src/Microsoft.SqlTools.ServiceLayer/LanguageServices/ConnectedBindingContext.cs

@@ -0,0 +1,208 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using System;
+using System.Threading;
+using Microsoft.SqlServer.Management.Common;
+using Microsoft.SqlServer.Management.SmoMetadataProvider;
+using Microsoft.SqlServer.Management.SqlParser.Binder;
+using Microsoft.SqlServer.Management.SqlParser.Common;
+using Microsoft.SqlServer.Management.SqlParser.MetadataProvider;
+using Microsoft.SqlServer.Management.SqlParser.Parser;
+
+namespace Microsoft.SqlTools.ServiceLayer.LanguageServices
+{
+    /// <summary>
+    /// Class for the binding context for connected sessions
+    /// </summary>
+    public class ConnectedBindingContext : IBindingContext
+    {
+        private ParseOptions parseOptions;
+
+        private ServerConnection serverConnection;
+
+        /// <summary>
+        /// Connected binding context constructor
+        /// </summary>
+        public ConnectedBindingContext()
+        {
+            this.BindingLocked = new ManualResetEvent(initialState: true);            
+            this.BindingTimeout = ConnectedBindingQueue.DefaultBindingTimeout;
+            this.MetadataDisplayInfoProvider = new MetadataDisplayInfoProvider();
+        }
+
+        /// <summary>
+        /// Gets or sets a flag indicating if the binder is connected
+        /// </summary>
+        public bool IsConnected { get; set; }
+
+        /// <summary>
+        /// Gets or sets the binding server connection
+        /// </summary>
+        public ServerConnection ServerConnection 
+        { 
+            get
+            {
+                return this.serverConnection;
+            }
+            set
+            {
+                this.serverConnection = value;
+
+                // reset the parse options so the get recreated for the current connection
+                this.parseOptions = null;
+            } 
+        }
+
+        /// <summary>
+        /// Gets or sets the metadata display info provider
+        /// </summary>
+        public MetadataDisplayInfoProvider MetadataDisplayInfoProvider { get; set; }
+
+        /// <summary>
+        /// Gets or sets the SMO metadata provider
+        /// </summary>
+        public SmoMetadataProvider SmoMetadataProvider { get; set; }
+
+        /// <summary>
+        /// Gets or sets the binder
+        /// </summary>
+        public IBinder Binder { get; set; }
+
+        /// <summary>
+        /// Gets or sets an event to signal if a binding operation is in progress
+        /// </summary>
+        public ManualResetEvent BindingLocked { get; set; } 
+
+        /// <summary>
+        /// Gets or sets the binding operation timeout in milliseconds
+        /// </summary>
+        public int BindingTimeout { get; set; } 
+
+        /// <summary>
+        /// Gets the Language Service ServerVersion
+        /// </summary>
+        public ServerVersion ServerVersion 
+        { 
+            get 
+            { 
+                return this.ServerConnection != null
+                    ? this.ServerConnection.ServerVersion
+                    : null; 
+            }
+        }
+
+        /// <summary>
+        /// Gets the current DataEngineType
+        /// </summary>
+        public DatabaseEngineType DatabaseEngineType 
+        { 
+            get 
+            { 
+                return this.ServerConnection != null
+                    ? this.ServerConnection.DatabaseEngineType
+                    : DatabaseEngineType.Standalone; 
+            }
+        }
+
+        /// <summary>
+        /// Gets the current connections TransactSqlVersion
+        /// </summary>
+        public TransactSqlVersion TransactSqlVersion
+        {
+            get
+            {
+                return this.IsConnected 
+                    ? GetTransactSqlVersion(this.ServerVersion)
+                    : TransactSqlVersion.Current;
+            }
+        }
+          
+        /// <summary>
+        /// Gets the current DatabaseCompatibilityLevel
+        /// </summary>
+        public DatabaseCompatibilityLevel DatabaseCompatibilityLevel
+        {
+            get
+            {
+                return this.IsConnected
+                    ? GetDatabaseCompatibilityLevel(this.ServerVersion)
+                    : DatabaseCompatibilityLevel.Current;
+            }
+        }
+
+        /// <summary>
+        /// Gets the current ParseOptions
+        /// </summary>
+        public ParseOptions ParseOptions
+        {
+            get
+            {
+                if (this.parseOptions == null)
+                {
+                    this.parseOptions = new ParseOptions(
+                        batchSeparator: LanguageService.DefaultBatchSeperator,
+                        isQuotedIdentifierSet: true, 
+                        compatibilityLevel: DatabaseCompatibilityLevel,
+                        transactSqlVersion: TransactSqlVersion);
+                }
+                return this.parseOptions;
+            }
+        }
+
+
+        /// <summary>
+        /// Gets the database compatibility level from a server version
+        /// </summary>
+        /// <param name="serverVersion"></param>
+        private static DatabaseCompatibilityLevel GetDatabaseCompatibilityLevel(ServerVersion serverVersion)
+        {
+            int versionMajor = Math.Max(serverVersion.Major, 8);
+
+            switch (versionMajor)
+            {
+                case 8:
+                    return DatabaseCompatibilityLevel.Version80;
+                case 9:
+                    return DatabaseCompatibilityLevel.Version90;
+                case 10:
+                    return DatabaseCompatibilityLevel.Version100;
+                case 11:
+                    return DatabaseCompatibilityLevel.Version110;
+                case 12:
+                    return DatabaseCompatibilityLevel.Version120;
+                case 13:
+                    return DatabaseCompatibilityLevel.Version130;
+                default:
+                    return DatabaseCompatibilityLevel.Current;
+            }
+        }
+
+        /// <summary>
+        /// Gets the transaction sql version from a server version
+        /// </summary>
+        /// <param name="serverVersion"></param>
+        private static TransactSqlVersion GetTransactSqlVersion(ServerVersion serverVersion)
+        {
+            int versionMajor = Math.Max(serverVersion.Major, 9);
+
+            switch (versionMajor)
+            {
+                case 9:
+                case 10:
+                    // In case of 10.0 we still use Version 10.5 as it is the closest available.
+                    return TransactSqlVersion.Version105;
+                case 11:
+                    return TransactSqlVersion.Version110;
+                case 12:
+                    return TransactSqlVersion.Version120;
+                case 13:
+                    return TransactSqlVersion.Version130;
+                default:
+                    return TransactSqlVersion.Current;
+            }
+        }
+    }
+}