server/AyaNova/util/TaskUtil.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -8,7 +9,9 @@ namespace AyaNova.Util
     {
         ///<summary>
         ///Usage:
-        ///await WithTimeoutAfterStart(ct => SomeOperationAsync(ct), TimeSpan.FromMilliseconds(n));
+        ///await WithTimeoutAfterStart(ctoken => SomeOperationAsync(ctoken), TimeSpan.FromMilliseconds(n));
+        ///in callee call this regularly    ctoken.ThrowIfCancellationRequested();
+        ///and pass the ctoken into any time consuming system methods called in turn
         ///</summary>
         public static async Task WithTimeoutAfterStart(Func<CancellationToken, Task> operation, TimeSpan timeout)
         {
@@ -19,6 +22,25 @@ namespace AyaNova.Util
             await task;
         }
 
+
+        ///<summary>
+        ///fire and forget a task but bubble up any exceptions with optional ignore some
+        ///</summary>
+        public static async void Forget(this Task task, params Type[] acceptableExceptions)
+        {
+            //https://stackoverflow.com/a/22864616/8939
+            try
+            {
+                await task.ConfigureAwait(false);
+            }
+            catch (Exception ex)
+            {
+                // TODO: consider whether derived types are also acceptable.
+                if (!acceptableExceptions.Contains(ex.GetType()))
+                    throw;
+            }
+        }
+
     }//eoc
 
 }//eons