server/util/TaskUtil.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Sockeye.Util
+{
+    internal static class TaskUtil
+    {
+        ///<summary>
+        ///Usage:
+        ///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)
+        {
+            //https://stackoverflow.com/a/23478628/8939
+            var source = new CancellationTokenSource();
+            var task = operation(source.Token);
+            source.CancelAfter(timeout);
+            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)
+            {                
+                if (!acceptableExceptions.Contains(ex.GetType()))
+                    throw;
+            }
+        }
+
+    }//eoc
+
+}//eons