Adding an information if group was created while adding a client (#23)

Author: tpeczek

Lib.AspNetCore.ServerSentEvents/IServerSentEventsService.cs

@@ -56,7 +56,8 @@ public interface IServerSentEventsService
         /// </summary>
         /// <param name="groupName">The group name.</param>
         /// <param name="client">The client to add to a group.</param>
-        Task AddToGroupAsync(string groupName, IServerSentEventsClient client);
+        /// <returns>The task object representing the result of asynchronous operation</returns>
+        Task<ServerSentEventsAddToGroupResult> AddToGroupAsync(string groupName, IServerSentEventsClient client);
 
         /// <summary>
         /// Changes the interval after which clients will attempt to reestablish failed connections.

Lib.AspNetCore.ServerSentEvents/ServerSentEventsAddToGroupResult.cs

@@ -0,0 +1,17 @@
+namespace Lib.AspNetCore.ServerSentEvents
+{
+    /// <summary>
+    /// The add to group results.
+    /// </summary>
+    public enum ServerSentEventsAddToGroupResult
+    {
+        /// <summary>
+        /// The client has been added to an existing group.
+        /// </summary>
+        AddedToExistingGroup = 1,
+        /// <summary>
+        /// The client has been added to a new group.
+        /// </summary>
+        AddedToNewGroup = 2
+    }
+}

Lib.AspNetCore.ServerSentEvents/ServerSentEventsService.cs

@@ -114,15 +114,22 @@ public IReadOnlyCollection<IServerSentEventsClient> GetClients(string groupName)
         /// Adds a client to the specified group.
         /// </summary>
         /// <param name="groupName">The group name.</param>
-        /// <param name="client">The client to add to a group.</param>
-        public async Task AddToGroupAsync(string groupName, IServerSentEventsClient client)
+        /// /// <param name="client">The client to add to a group.</param>
+        /// <returns>The task object representing the result of asynchronous operation</returns>
+        public async Task<ServerSentEventsAddToGroupResult> AddToGroupAsync(string groupName, IServerSentEventsClient client)
         {
+            ServerSentEventsAddToGroupResult result = ServerSentEventsAddToGroupResult.AddedToExistingGroup;
+
             if (!_groups.ContainsKey(groupName))
             {
                 await CreateGroupAsync(groupName);
+
+                result = ServerSentEventsAddToGroupResult.AddedToNewGroup;
             }
 
             _groups[groupName].TryAdd(client.Id, client);
+
+            return result;
         }
 
         /// <summary>