From 32f6cbc3041c598c5c90bd86148041c6c8c2dbcc Mon Sep 17 00:00:00 2001
From: Mitchell Sternke <mitchellsternke@gmail.com>
Date: Tue, 15 Nov 2016 18:12:16 -0800
Subject: [PATCH] Language service no longer binds on duplicate connections
 (#148)

---
 .../LanguageServices/BindingQueue.cs                  | 11 +++++++++++
 .../LanguageServices/ConnectedBindingQueue.cs         |  5 +++++
 2 files changed, 16 insertions(+)

diff --git a/src/Microsoft.SqlTools.ServiceLayer/LanguageServices/BindingQueue.cs b/src/Microsoft.SqlTools.ServiceLayer/LanguageServices/BindingQueue.cs
index 6058ec42..07623afb 100644
--- a/src/Microsoft.SqlTools.ServiceLayer/LanguageServices/BindingQueue.cs
+++ b/src/Microsoft.SqlTools.ServiceLayer/LanguageServices/BindingQueue.cs
@@ -112,6 +112,17 @@ namespace Microsoft.SqlTools.ServiceLayer.LanguageServices
             }      
         }
 
+        /// <summary>
+        /// Checks if a binding context already exists for the provided context key
+        /// </summary>
+        protected bool BindingContextExists(string key)
+        {
+            lock (this.bindingContextLock)
+            {
+                return this.BindingContextMap.ContainsKey(key);
+            }
+        }
+
         private bool HasPendingQueueItems
         {
             get
diff --git a/src/Microsoft.SqlTools.ServiceLayer/LanguageServices/ConnectedBindingQueue.cs b/src/Microsoft.SqlTools.ServiceLayer/LanguageServices/ConnectedBindingQueue.cs
index 965d94d2..bd767a7a 100644
--- a/src/Microsoft.SqlTools.ServiceLayer/LanguageServices/ConnectedBindingQueue.cs
+++ b/src/Microsoft.SqlTools.ServiceLayer/LanguageServices/ConnectedBindingQueue.cs
@@ -61,6 +61,11 @@ namespace Microsoft.SqlTools.ServiceLayer.LanguageServices
 
             // lookup the current binding context
             string connectionKey = GetConnectionContextKey(connInfo);
+            if (BindingContextExists(connectionKey))
+            {
+                // no need to populate the context again since the context already exists
+                return connectionKey;
+            }
             IBindingContext bindingContext = this.GetOrCreateBindingContext(connectionKey);
 
             if (bindingContext.BindingLock.WaitOne())