Fast stop on application stop.

framework/src/Volo.Abp.EventBus.Boxes/Volo/Abp/EventBus/Boxes/InboxProcessor.cs

@@ -28,6 +28,8 @@ namespace Volo.Abp.EventBus.Boxes
 
         protected string DistributedLockName => "Inbox_" + InboxConfig.Name;
         public ILogger<InboxProcessor> Logger { get; set; }
+        protected CancellationTokenSource StoppingTokenSource { get; }
+        protected CancellationToken StoppingToken { get; }
 
         public InboxProcessor(
             IServiceProvider serviceProvider,
@@ -46,6 +48,8 @@ namespace Volo.Abp.EventBus.Boxes
             Timer.Period = 2000; //TODO: Config?
             Timer.Elapsed += TimerOnElapsed;
             Logger = NullLogger<InboxProcessor>.Instance;
+            StoppingTokenSource = new CancellationTokenSource();
+            StoppingToken = StoppingTokenSource.Token;
         }
 
         private async Task TimerOnElapsed(AbpAsyncTimer arg)
@@ -63,13 +67,20 @@ namespace Volo.Abp.EventBus.Boxes
 
         public Task StopAsync(CancellationToken cancellationToken = default)
         {
+            StoppingTokenSource.Cancel();
             Timer.Stop(cancellationToken);
+            StoppingTokenSource.Dispose();
             return Task.CompletedTask;
         }
 
         protected virtual async Task RunAsync()
         {
-            await using (var handle = await DistributedLockProvider.TryAcquireLockAsync(DistributedLockName))
+            if (StoppingToken.IsCancellationRequested)
+            {
+                return;
+            }
+            
+            await using (var handle = await DistributedLockProvider.TryAcquireLockAsync(DistributedLockName, cancellationToken: StoppingToken))
             {
                 if (handle != null)
                 {
@@ -79,7 +90,7 @@ namespace Volo.Abp.EventBus.Boxes
 
                     while (true)
                     {
-                        var waitingEvents = await Inbox.GetWaitingEventsAsync(1000); //TODO: Config?
+                        var waitingEvents = await Inbox.GetWaitingEventsAsync(1000); //TODO: Config? Pass StoppingToken!
                         if (waitingEvents.Count <= 0)
                         {
                             break;
@@ -107,7 +118,7 @@ namespace Volo.Abp.EventBus.Boxes
                 else
                 {
                     Logger.LogDebug("Could not obtain the distributed lock: " + DistributedLockName);
-                    await Task.Delay(7000); //TODO: Can we pass a cancellation token to cancel on shutdown? (Config?)
+                    await TaskDelayHelper.DelayAsync(15000, StoppingToken); //TODO: Config?
                 }
             }
         }

framework/src/Volo.Abp.EventBus.Boxes/Volo/Abp/EventBus/Boxes/OutboxSender.cs

@@ -21,6 +21,9 @@ namespace Volo.Abp.EventBus.Boxes
         protected OutboxConfig OutboxConfig { get; private set; }
         protected string DistributedLockName => "Outbox_" + OutboxConfig.Name;
         public ILogger<OutboxSender> Logger { get; set; }
+        
+        protected CancellationTokenSource StoppingTokenSource { get; }
+        protected CancellationToken StoppingToken { get; }
 
         public OutboxSender(
             IServiceProvider serviceProvider,
@@ -35,6 +38,8 @@ namespace Volo.Abp.EventBus.Boxes
             Timer.Period = 2000; //TODO: Config?
             Timer.Elapsed += TimerOnElapsed;
             Logger = NullLogger<OutboxSender>.Instance;
+            StoppingTokenSource = new CancellationTokenSource();
+            StoppingToken = StoppingTokenSource.Token;
         }
 
         public virtual Task StartAsync(OutboxConfig outboxConfig, CancellationToken cancellationToken = default)
@@ -47,7 +52,9 @@ namespace Volo.Abp.EventBus.Boxes
 
         public virtual Task StopAsync(CancellationToken cancellationToken = default)
         {
+            StoppingTokenSource.Cancel();
             Timer.Stop(cancellationToken);
+            StoppingTokenSource.Dispose();
             return Task.CompletedTask;
         }
 
@@ -62,8 +69,6 @@ namespace Volo.Abp.EventBus.Boxes
             {
                 if (handle != null)
                 {
-                    Logger.LogDebug("Obtained the distributed lock: " + DistributedLockName);
-
                     while (true)
                     {
                         var waitingEvents = await Outbox.GetWaitingEventsAsync(1000); //TODO: Config?
@@ -89,7 +94,7 @@ namespace Volo.Abp.EventBus.Boxes
                 else
                 {
                     Logger.LogDebug("Could not obtain the distributed lock: " + DistributedLockName);
-                    await Task.Delay(7000); //TODO: Can we pass a cancellation token to cancel on shutdown? (Config?)
+                    await TaskDelayHelper.DelayAsync(15000, StoppingToken); //TODO: Config?
                 }
             }
         }

framework/src/Volo.Abp.EventBus.Boxes/Volo/Abp/EventBus/Boxes/TaskHelper.cs

@@ -0,0 +1,20 @@
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Volo.Abp.EventBus.Boxes
+{
+    internal static class TaskDelayHelper
+    {
+        public static async Task DelayAsync(int milliseconds, CancellationToken cancellationToken = default)
+        {
+            try
+            {
+                await Task.Delay(milliseconds, cancellationToken);
+            }
+            catch (TaskCanceledException)
+            {
+                return;
+            }
+        }
+    }
+}

test/DistEvents/DistDemoApp.Shared/DistDemoAppSharedModule.cs

@@ -14,7 +14,7 @@ namespace DistDemoApp
         typeof(AbpAutofacModule),
         typeof(AbpDddDomainModule),
         typeof(AbpEventBusBoxesModule)
-        )]
+        )] 
     public class DistDemoAppSharedModule : AbpModule
     {
         public override void ConfigureServices(ServiceConfigurationContext context)