Began implementing explicit log flushing.

src/GameServiceWarden.Host/Logging/FileLogReceiver.cs

@@ -6,9 +6,14 @@ namespace GameServiceWarden.Host.Logging
     {
         public LogLevel Level => LogLevel.INFO;
 
+        public void Flush()
+        {
+            throw new NotImplementedException();
+        }
+
         public void LogMessage(string message, DateTime time, LogLevel level)
         {
-            
+            throw new NotImplementedException();
         }
     }
 }

src/GameServiceWarden.Host/Logging/ILogRecievable.cs

@@ -17,5 +17,10 @@ namespace GameServiceWarden.Host.Logging
         /// <param name="time">The time at which this message was requested to be logged.</param>
         /// <param name="level">The severity of this message.</param>
         void LogMessage(string message, DateTime time, LogLevel level);
+
+        /// <summary>
+        /// Called when this receiver should explicitly flush received messages.
+        /// </summary>
+        void Flush();
     }
 }

src/GameServiceWarden.Host/Logging/Logger.cs

@@ -4,7 +4,7 @@ using System.Collections.Generic;
 namespace GameServiceWarden.Host.Logging
 {
     public class Logger {
-        private HashSet<ILogReceiver> listeners = new HashSet<ILogReceiver>();
+        private readonly HashSet<ILogReceiver> listeners = new HashSet<ILogReceiver>();
 
         /// <summary>
         /// Logs the message to listeners that are listening to the set severity of the message or greater.
@@ -39,8 +39,12 @@ namespace GameServiceWarden.Host.Logging
         /// <summary>
         /// Called when all listeners should perform any flushing they need.
         /// </summary>
-        public static void FlushListeners() {
-
+        public void FlushListeners()
+        {
+            foreach (ILogReceiver listener in listeners)
+            {
+                listener.Flush();
+            }
         }
     }
 }