add from giga-device, new branch added

StgSharp.Common/Timing/TimeSourceProvider.cs

@@ -0,0 +1,69 @@
+//-----------------------------------------------------------------------
+// -----------------------------------------------------------------------
+// file="TimeSourceProvider.cs"
+// Project: StgSharp
+// AuthorGroup: Nitload Space
+// Copyright (c) Nitload Space. All rights reserved.
+//     
+// Permission is hereby granted, free of charge, to any person 
+// obtaining a copy of this software and associated documentation 
+// files (the “Software”), to deal in the Software without restriction, 
+// including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, 
+// and to permit persons to whom the Software is furnished to do so, 
+// subject to the following conditions:
+//     
+// The above copyright notice and 
+// this permission notice shall be included in all copies 
+// or substantial portions of the Software.
+//     
+// THE SOFTWARE IS PROVIDED “AS IS”, 
+// WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
+// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
+// ARISING FROM, OUT OF OR IN CONNECTION WITH 
+// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//     
+// -----------------------------------------------------------------------
+// -----------------------------------------------------------------------
+using StgSharp;
+
+using System;
+using System.Linq;
+using System.Threading;
+
+namespace StgSharp.Timing
+{
+    public abstract class TimeSourceProviderBase
+    {
+
+        private readonly object _subscriberLock = new();
+
+        protected object SubscribeLock => _subscriberLock;
+
+        public void AddSubscriber(TimeSpanProvider subscriber)
+        {
+            lock (_subscriberLock) {
+                AddSubscriberUnsynced(subscriber);
+            }
+        }
+
+        public void RemoveSubscriber(TimeSpanProvider subscriber)
+        {
+            lock (_subscriberLock) {
+                RemoveSubscriberUnsynced(subscriber);
+            }
+        }
+
+        public abstract void StartProvidingTime();
+
+        public abstract void StopProvidingTime();
+
+        protected abstract void AddSubscriberUnsynced(TimeSpanProvider subscriber);
+
+        protected abstract void RemoveSubscriberUnsynced(TimeSpanProvider subscriber);
+
+    }
+}