Add timer for priceFetcher

src/Managing.Application/Grains/PriceFetcher15MinGrain.cs

@@ -24,6 +24,7 @@ public class PriceFetcher15MinGrain : Grain, IPriceFetcher15MinGrain, IRemindabl
     private readonly IGrainFactory _grainFactory;
 
     private const string FetchPricesReminderName = "Fetch15minPricesReminder";
+    private IDisposable _timer;
 
     // Predefined lists of trading parameters to fetch
     private static readonly TradingExchanges[] SupportedExchanges =
@@ -51,15 +52,24 @@ public class PriceFetcher15MinGrain : Grain, IPriceFetcher15MinGrain, IRemindabl
     {
         _logger.LogInformation("{0} activated", nameof(PriceFetcher15MinGrain));
 
-        // Register a reminder to fetch prices every 5 minutes
+        // Register a reminder to enable timer if not existing
         await this.RegisterOrUpdateReminder(
             FetchPricesReminderName,
-            TimeSpan.FromMinutes(5),
+            TimeSpan.FromSeconds(5),
             TimeSpan.FromMinutes(5));
 
         await base.OnActivateAsync(cancellationToken);
     }
 
+    public override async Task OnDeactivateAsync(DeactivationReason reason, CancellationToken cancellationToken)
+    {
+        _logger.LogInformation("{0} deactivating. Reason: {Reason}",
+            nameof(PriceFetcher15MinGrain), reason.Description);
+
+        StopAndDisposeTimer();
+        await base.OnDeactivateAsync(reason, cancellationToken);
+    }
+
     public async Task<bool> FetchAndPublishPricesAsync()
     {
         try
@@ -167,23 +177,46 @@ public class PriceFetcher15MinGrain : Grain, IPriceFetcher15MinGrain, IRemindabl
         }
     }
 
-    private static int GetTimeframeMinutes(Timeframe timeframe) => timeframe switch
+    /// <summary>
+    /// Starts the Orleans timer for periodic price fetching
+    /// </summary>
+    private void RegisterAndStartTimer()
     {
-        Timeframe.OneMinute => 1,
-        Timeframe.FiveMinutes => 5,
-        Timeframe.FifteenMinutes => 15,
-        Timeframe.ThirtyMinutes => 30,
-        Timeframe.OneHour => 60,
-        Timeframe.FourHour => 240,
-        Timeframe.OneDay => 1440,
-        _ => 1
-    };
+        if (_timer != null) return;
 
-    public async Task ReceiveReminder(string reminderName, TickStatus status)
+        _timer = this.RegisterGrainTimer(
+            async _ => await FetchAndPublishPricesAsync(),
+            new GrainTimerCreationOptions
+            {
+                Period = TimeSpan.FromMinutes(15),
+                DueTime = TimeSpan.FromSeconds(1),
+                KeepAlive = true
+            });
+
+        _logger.LogInformation("{0} timer registered and started", nameof(PriceFetcher15MinGrain));
+    }
+
+    private void StopAndDisposeTimer()
+    {
+        if (_timer != null)
+        {
+            _timer?.Dispose();
+            _timer = null;
+            _logger.LogInformation("{0} timer stopped and disposed", nameof(PriceFetcher15MinGrain));
+        }
+    }
+
+    public Task ReceiveReminder(string reminderName, TickStatus status)
     {
         if (reminderName == FetchPricesReminderName)
         {
-            await FetchAndPublishPricesAsync();
+            // Only enable timer if not existing anymore
+            if (_timer == null)
+            {
+                RegisterAndStartTimer();
+            }
         }
+        
+        return Task.CompletedTask;
     }
 }