Approach for better implementation for RunUntilEmptyAsync

src/Foundatio/Jobs/IJob.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using Foundatio.Utility;
@@ -30,21 +31,32 @@ public static async Task<JobResult> TryRunAsync(this IJob job, CancellationToken
         }
     }
 
-    public static async Task RunContinuousAsync(this IJob job, TimeSpan? interval = null, int iterationLimit = -1, CancellationToken cancellationToken = default, Func<Task<bool>> continuationCallback = null)
+    /// <summary>
+    /// Runs the job continuously until the cancellation token is set or the iteration limit is reached.
+    /// </summary>
+    /// <returns>Returns the iteration count for normal jobs. For queue based jobs this will be the amount of items processed successfully.</returns>
+    public static async Task<int> RunContinuousAsync(this IJob job, TimeSpan? interval = null, int iterationLimit = -1, CancellationToken cancellationToken = default, Func<Task<bool>> continuationCallback = null)
     {
         int iterations = 0;
         string jobName = job.GetType().Name;
         var logger = job.GetLogger();
+        bool isInformationLogLevelEnabled = logger.IsEnabled(LogLevel.Information);
+
+        int queueItemsProcessed = 0;
+        bool isQueueJob = job.GetType().GetInterfaces().Any(x => x.IsGenericType && x.GetGenericTypeDefinition() == typeof(IQueueJob<>));
 
         using var _ = logger.BeginScope(new Dictionary<string, object> { { "job", jobName } });
-        if (logger.IsEnabled(LogLevel.Information))
+        if (isInformationLogLevelEnabled)
             logger.LogInformation("Starting continuous job type {JobName} on machine {MachineName}...", jobName, Environment.MachineName);
 
         while (!cancellationToken.IsCancellationRequested)
         {
             var result = await job.TryRunAsync(cancellationToken).AnyContext();
             logger.LogJobResult(result, jobName);
+
             iterations++;
+            if (isQueueJob && result.IsSuccess)
+                queueItemsProcessed++;
 
             if (cancellationToken.IsCancellationRequested || (iterationLimit > -1 && iterationLimit <= iterations))
                 break;
@@ -72,18 +84,31 @@ public static async Task RunContinuousAsync(this IJob job, TimeSpan? interval =
                 if (!await continuationCallback().AnyContext())
                     break;
             }
-            catch (Exception ex)
+            catch (Exception ex) when (logger.IsEnabled(LogLevel.Error))
             {
-                if (logger.IsEnabled(LogLevel.Error))
-                    logger.LogError(ex, "Error in continuation callback: {Message}", ex.Message);
+                logger.LogError(ex, "Error in continuation callback: {Message}", ex.Message);
             }
         }
 
-        logger.LogInformation("Finished continuous job type {JobName}: {IterationLimit} {Iterations}", jobName, Environment.MachineName, iterationLimit, iterations);
         if (cancellationToken.IsCancellationRequested && logger.IsEnabled(LogLevel.Trace))
             logger.LogTrace("Job cancellation requested");
 
-        if (logger.IsEnabled(LogLevel.Information))
-            logger.LogInformation("Stopping continuous job type {JobName} on machine {MachineName}...", jobName, Environment.MachineName);
+        if (isInformationLogLevelEnabled)
+        {
+            if (iterationLimit > 0)
+            {
+                logger.LogInformation(
+                    "Stopping continuous job type {JobName} on machine {MachineName}: Job ran {Iterations} times (Limit={IterationLimit})",
+                    jobName, Environment.MachineName, iterationLimit, iterations);
+            }
+            else
+            {
+                logger.LogInformation(
+                    "Stopping continuous job type {JobName} on machine {MachineName}: Job ran {Iterations} times",
+                    jobName, Environment.MachineName, iterations);
+            }
+        }
+
+        return isQueueJob ? queueItemsProcessed : iterations;
     }
 }

src/Foundatio/Jobs/IQueueJob.cs

@@ -19,22 +19,31 @@ public interface IQueueJob<T> : IJob where T : class
 
 public static class QueueJobExtensions
 {
-    public static async Task RunUntilEmptyAsync<T>(this IQueueJob<T> job, TimeSpan acquireTimeout,
+    /// <summary>
+    /// Will run until the wait timeout expires, if expired the job will be cancelled.
+    /// </summary>
+    /// <returns>The amount of queue items processed.</returns>
+    public static async Task<int> RunUntilEmptyAsync<T>(this IQueueJob<T> job, TimeSpan waitTimeout,
         CancellationToken cancellationToken = default) where T : class
     {
-        if (acquireTimeout <= TimeSpan.Zero)
-            throw new ArgumentException("Acquire timeout must be greater than zero", nameof(acquireTimeout));
+        if (waitTimeout <= TimeSpan.Zero)
+            throw new ArgumentException("Acquire timeout must be greater than zero", nameof(waitTimeout));
 
         using var linkedCancellationTokenSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
-        linkedCancellationTokenSource.CancelAfter(acquireTimeout);
+        linkedCancellationTokenSource.CancelAfter(waitTimeout);
 
         // NOTE: This has to be awaited otherwise the linkedCancellationTokenSource cancel timer will not fire.
-        await job.RunUntilEmptyAsync(linkedCancellationTokenSource.Token);
+        return await job.RunUntilEmptyAsync(linkedCancellationTokenSource.Token).AnyContext();
     }
 
-    public static Task RunUntilEmptyAsync<T>(this IQueueJob<T> job, CancellationToken cancellationToken = default) where T : class
+    /// <summary>
+    /// Will wait up to thirty seconds if queue is empty, otherwise will run until the queue is empty or cancelled.
+    /// </summary>
+    /// <returns>The amount of queue items processed.</returns>
+    public static Task<int> RunUntilEmptyAsync<T>(this IQueueJob<T> job, CancellationToken cancellationToken = default) where T : class
     {
         var logger = job.GetLogger();
+
         return job.RunContinuousAsync(cancellationToken: cancellationToken, continuationCallback: async () =>
         {
             // Allow abandoned items to be added in a background task.

src/Foundatio/Jobs/JobWithLockBase.cs

@@ -23,10 +23,9 @@ public JobWithLockBase(ILoggerFactory loggerFactory = null)
     public virtual async Task<JobResult> RunAsync(CancellationToken cancellationToken = default)
     {
         var lockValue = await GetLockAsync(cancellationToken).AnyContext();
-        if (lockValue == null)
+        if (lockValue is null)
         {
-            _logger.LogTrace("Unable to acquire job lock");
-            return JobResult.Success;
+            return JobResult.CancelledWithMessage("Unable to acquire job lock");
         }
 
         try

src/Foundatio/Jobs/QueueJobBase.cs

@@ -41,6 +41,10 @@ public virtual async Task<JobResult> RunAsync(CancellationToken cancellationToke
         {
             queueEntry = await _queue.Value.DequeueAsync(linkedCancellationTokenSource.Token).AnyContext();
         }
+        catch (OperationCanceledException)
+        {
+            return JobResult.Cancelled;
+        }
         catch (Exception ex)
         {
             return JobResult.FromException(ex, $"Error trying to dequeue message: {ex.Message}");
@@ -51,8 +55,11 @@ public virtual async Task<JobResult> RunAsync(CancellationToken cancellationToke
 
     public async Task<JobResult> ProcessAsync(IQueueEntry<T> queueEntry, CancellationToken cancellationToken)
     {
+        if (cancellationToken.IsCancellationRequested && queueEntry == null)
+            return JobResult.Cancelled;
+
         if (queueEntry == null)
-            return JobResult.Success;
+            return JobResult.CancelledWithMessage("No queue entry to process.");
 
         using var activity = StartProcessQueueEntryActivity(queueEntry);
         using var _ = _logger.BeginScope(s => s
@@ -73,11 +80,10 @@ public async Task<JobResult> ProcessAsync(IQueueEntry<T> queueEntry, Cancellatio
         }
 
         var lockValue = await GetQueueEntryLockAsync(queueEntry, cancellationToken).AnyContext();
-        if (lockValue == null)
+        if (lockValue is null)
         {
             await queueEntry.AbandonAsync().AnyContext();
-            _logger.LogTrace("Unable to acquire queue entry lock");
-            return JobResult.Success;
+            return JobResult.CancelledWithMessage($"Unable to acquire queue entry lock. Abandoning {_queueEntryName} queue entry: {queueEntry.Id}");
         }
 
         bool isTraceLogLevelEnabled = _logger.IsEnabled(LogLevel.Trace);
@@ -130,9 +136,8 @@ public async Task<JobResult> ProcessAsync(IQueueEntry<T> queueEntry, Cancellatio
     protected virtual Activity StartProcessQueueEntryActivity(IQueueEntry<T> entry)
     {
         var activity = FoundatioDiagnostics.ActivitySource.StartActivity("ProcessQueueEntry", ActivityKind.Server, entry.CorrelationId);
-
-        if (activity == null)
-            return activity;
+        if (activity is null)
+            return null;
 
         if (entry.Properties != null && entry.Properties.TryGetValue("TraceState", out var traceState))
             activity.TraceStateString = traceState.ToString();

src/Foundatio/Jobs/WorkItemJob/WorkItemJob.cs

@@ -43,6 +43,10 @@ public virtual async Task<JobResult> RunAsync(CancellationToken cancellationToke
         {
             queueEntry = await _queue.DequeueAsync(linkedCancellationTokenSource.Token).AnyContext();
         }
+        catch (OperationCanceledException)
+        {
+            return JobResult.Cancelled;
+        }
         catch (Exception ex)
         {
             return JobResult.FromException(ex, $"Error trying to dequeue work item: {ex.Message}");
@@ -53,8 +57,11 @@ public virtual async Task<JobResult> RunAsync(CancellationToken cancellationToke
 
     public async Task<JobResult> ProcessAsync(IQueueEntry<WorkItemData> queueEntry, CancellationToken cancellationToken)
     {
+        if (cancellationToken.IsCancellationRequested && queueEntry == null)
+            return JobResult.Cancelled;
+
         if (queueEntry == null)
-            return JobResult.Success;
+            return JobResult.CancelledWithMessage("No queue entry to process.");
 
         if (cancellationToken.IsCancellationRequested)
         {
@@ -98,13 +105,13 @@ public async Task<JobResult> ProcessAsync(IQueueEntry<WorkItemData> queueEntry,
             await ReportProgressAsync(handler, queueEntry).AnyContext();
 
         var lockValue = await handler.GetWorkItemLockAsync(workItemData, cancellationToken).AnyContext();
-        if (lockValue == null)
+        if (lockValue is null)
         {
             if (handler.Log.IsEnabled(LogLevel.Information))
-                handler.Log.LogInformation("Abandoning {TypeName} work item: {Id}: Unable to acquire work item lock.", queueEntry.Value.Type, queueEntry.Id);
+                handler.Log.LogInformation("Abandoning {TypeName} work item: {Id}: Unable to acquire work item lock", queueEntry.Value.Type, queueEntry.Id);
 
             await queueEntry.AbandonAsync().AnyContext();
-            return JobResult.Success;
+            return JobResult.CancelledWithMessage($"Unable to acquire work item lock. Abandoning {queueEntry.Value.Type} queue entry: {queueEntry.Id}");
         }
 
         var progressCallback = new Func<int, string, Task>(async (progress, message) =>
@@ -179,9 +186,8 @@ await Task.WhenAll(
     protected virtual Activity StartProcessWorkItemActivity(IQueueEntry<WorkItemData> entry, Type workItemDataType)
     {
         var activity = FoundatioDiagnostics.ActivitySource.StartActivity("ProcessQueueEntry", ActivityKind.Server, entry.CorrelationId);
-
-        if (activity == null)
-            return activity;
+        if (activity is null)
+            return null;
 
         if (entry.Properties != null && entry.Properties.TryGetValue("TraceState", out var traceState))
             activity.TraceStateString = traceState.ToString();

src/Foundatio/Lock/CacheLockProvider.cs

@@ -68,9 +68,8 @@ private Task OnLockReleasedAsync(CacheLockReleased msg, CancellationToken cancel
     protected virtual Activity StartLockActivity(string resource)
     {
         var activity = FoundatioDiagnostics.ActivitySource.StartActivity("AcquireLock");
-
-        if (activity == null)
-            return activity;
+        if (activity is null)
+            return null;
 
         activity.AddTag("resource", resource);
         activity.DisplayName = $"Lock: {resource}";

src/Foundatio/Messaging/MessageBusBase.cs

@@ -296,9 +296,8 @@ protected async Task SendMessageToSubscribersAsync(IMessage message)
     protected virtual Activity StartHandleMessageActivity(IMessage message)
     {
         var activity = FoundatioDiagnostics.ActivitySource.StartActivity("HandleMessage", ActivityKind.Server, message.CorrelationId);
-
-        if (activity == null)
-            return activity;
+        if (activity is null)
+            return null;
 
         if (message.Properties != null && message.Properties.TryGetValue("TraceState", out var traceState))
             activity.TraceStateString = traceState.ToString();

tests/Foundatio.Tests/Jobs/WorkItemJobTests.cs

@@ -179,7 +179,7 @@ await messageBus.SubscribeAsync<WorkItemStatus>(status =>
             countdown.Signal();
         });
 
-        await job.RunUntilEmptyAsync();
+        Assert.Equal(1, await job.RunUntilEmptyAsync());
         await countdown.WaitAsync(TimeSpan.FromSeconds(2));
         Assert.Equal(0, countdown.CurrentCount);
     }
@@ -217,7 +217,7 @@ await messageBus.SubscribeAsync<WorkItemStatus>(status =>
             countdown.Signal();
         });
 
-        await job.RunUntilEmptyAsync();
+        Assert.Equal(1, await job.RunUntilEmptyAsync());
         await countdown.WaitAsync(TimeSpan.FromSeconds(2));
         Assert.Equal(0, countdown.CurrentCount);
     }
@@ -242,7 +242,7 @@ await queue.EnqueueAsync(new MyWorkItem
             SomeData = "Test"
         }, true);
 
-        await job.RunUntilEmptyAsync();
+        Assert.Equal(2, await job.RunUntilEmptyAsync());
         var stats = await queue.GetQueueStatsAsync();
         Assert.Equal(2, stats.Enqueued);
         Assert.Equal(2, stats.Dequeued);
@@ -260,17 +260,45 @@ public async Task CanRunWorkItemJobUntilEmptyWithNoEnqueuedItems()
         handlerRegistry.Register<MyWorkItem>(new MyWorkItemHandler(Log));
 
         var sw = Stopwatch.StartNew();
-        await job.RunUntilEmptyAsync(TimeSpan.FromMilliseconds(100));
+        Assert.Equal(0, await job.RunUntilEmptyAsync(TimeSpan.FromMilliseconds(100)));
         sw.Stop();
 
-        Assert.True(sw.Elapsed < TimeSpan.FromMilliseconds(500));
+        Assert.True(sw.Elapsed < TimeSpan.FromMilliseconds(250));
 
         var stats = await queue.GetQueueStatsAsync();
         Assert.Equal(0, stats.Enqueued);
         Assert.Equal(0, stats.Dequeued);
         Assert.Equal(0, stats.Completed);
     }
 
+    [Fact]
+    public async Task CanRunWorkItemJobUntilEmptyHandlesCancellation()
+    {
+        using var queue = new InMemoryQueue<WorkItemData>(o => o.LoggerFactory(Log));
+        using var messageBus = new InMemoryMessageBus(o => o.LoggerFactory(Log));
+        var handlerRegistry = new WorkItemHandlers();
+        var job = new WorkItemJob(queue, messageBus, handlerRegistry, Log);
+
+        handlerRegistry.Register<MyWorkItem>(new MyWorkItemHandler(Log));
+
+        await queue.EnqueueAsync(new MyWorkItem
+        {
+            SomeData = "Test"
+        }, true);
+
+        await queue.EnqueueAsync(new MyWorkItem
+        {
+            SomeData = "Test"
+        }, true);
+
+        Assert.Equal(1, await job.RunUntilEmptyAsync(TimeSpan.FromMilliseconds(50)));
+
+        var stats = await queue.GetQueueStatsAsync();
+        Assert.Equal(2, stats.Enqueued);
+        Assert.Equal(1, stats.Dequeued);
+        Assert.Equal(1, stats.Completed);
+    }
+
     [Fact]
     public async Task CanRunBadWorkItem()
     {
@@ -299,7 +327,7 @@ await messageBus.SubscribeAsync<WorkItemStatus>(status =>
             countdown.Signal();
         });
 
-        await job.RunUntilEmptyAsync();
+        Assert.Equal(0, await job.RunUntilEmptyAsync());
         await countdown.WaitAsync(TimeSpan.FromSeconds(2));
         Assert.Equal(0, countdown.CurrentCount);
     }