Added pption to force reliable ordering of TCP messages.

.gitignore

@@ -191,3 +191,6 @@ GeneratedArtifacts/
 _Pvt_Extensions/
 ModelManifest.xml
 *.ide
+
+# Visual Studio directories
+.vs/

Hazel/Hazel.csproj

@@ -65,6 +65,7 @@
     <Compile Include="ObjectPool.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="SendOption.cs" />
+    <Compile Include="Tcp\TcpOptions.cs" />
     <Compile Include="Udp\SendOptionInternal.cs" />
     <Compile Include="Tcp\StateObject.cs" />
     <Compile Include="ConnectionStatistics.cs" />

Hazel/Tcp/TcpConnection.cs

@@ -190,6 +190,12 @@ void BodyReadCallback(byte[] bytes)
             //Begin receiving from the start
             try
             {
+                 //Fire DataReceived event before reading next message.
+                if(TcpOptions.ForceReliableOrdering == true)
+                {
+                    InvokeDataReceived(bytes, SendOption.FragmentedReliable);
+                }
+
                 StartWaitingForHeader(BodyReadCallback);
             }
             catch (Exception e)
@@ -199,8 +205,11 @@ void BodyReadCallback(byte[] bytes)
 
             Statistics.LogFragmentedReceive(bytes.Length, bytes.Length + 4);
 
-            //Fire DataReceived event
-            InvokeDataReceived(bytes, SendOption.FragmentedReliable);
+            //Fire DataReceived event after reading next message for better throughput.
+            if(TcpOptions.ForceReliableOrdering == false)
+            {
+                InvokeDataReceived(bytes, SendOption.FragmentedReliable);
+            }
         }
 
         /// <summary>

Hazel/Tcp/TcpOptions.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Hazel.Tcp
+{
+    public static class TcpOptions
+    {
+        /// <summary>
+        /// Force data received even to fire before reading the next message. 
+        /// Setting to false may offer a slight performance advantage at the risk of compromising message ordering. 
+        /// </summary>
+        public static bool ForceReliableOrdering { get; set; } = false;
+    }
+}