Expose dynamic worker scheduler capabilities

framework/src/Volo.Abp.BackgroundWorkers.Hangfire/Volo/Abp/BackgroundWorkers/Hangfire/HangfireDynamicBackgroundWorkerManager.cs

@@ -18,6 +18,8 @@ public class HangfireDynamicBackgroundWorkerManager : IDynamicBackgroundWorkerMa
     protected IServiceProvider ServiceProvider { get; }
     protected IDynamicBackgroundWorkerHandlerRegistry HandlerRegistry { get; }
     public ILogger<HangfireDynamicBackgroundWorkerManager> Logger { get; set; }
+    public virtual DynamicBackgroundWorkerManagerCapabilities Capabilities { get; } =
+        new DynamicBackgroundWorkerManagerCapabilities();
 
     public HangfireDynamicBackgroundWorkerManager(
         IServiceProvider serviceProvider,

framework/src/Volo.Abp.BackgroundWorkers.Quartz/Volo/Abp/BackgroundWorkers/Quartz/QuartzDynamicBackgroundWorkerManager.cs

@@ -17,6 +17,8 @@ public class QuartzDynamicBackgroundWorkerManager : IDynamicBackgroundWorkerMana
     protected IScheduler Scheduler { get; }
     protected IDynamicBackgroundWorkerHandlerRegistry HandlerRegistry { get; }
     public ILogger<QuartzDynamicBackgroundWorkerManager> Logger { get; set; }
+    public virtual DynamicBackgroundWorkerManagerCapabilities Capabilities { get; } =
+        new DynamicBackgroundWorkerManagerCapabilities();
 
     public QuartzDynamicBackgroundWorkerManager(
         IScheduler scheduler,

framework/src/Volo.Abp.BackgroundWorkers.TickerQ/Volo/Abp/BackgroundWorkers/TickerQ/TickerQDynamicBackgroundWorkerManager.cs

@@ -7,6 +7,13 @@ namespace Volo.Abp.BackgroundWorkers.TickerQ;
 [Dependency(ReplaceServices = true)]
 public class TickerQDynamicBackgroundWorkerManager : IDynamicBackgroundWorkerManager, ISingletonDependency
 {
+    public virtual DynamicBackgroundWorkerManagerCapabilities Capabilities { get; } =
+        new DynamicBackgroundWorkerManagerCapabilities
+        {
+            SupportsDynamicRegistration = false,
+            SupportsCronExpression = false
+        };
+
     public virtual Task AddAsync(
         string workerName,
         DynamicBackgroundWorkerSchedule schedule,

framework/src/Volo.Abp.BackgroundWorkers/Volo/Abp/BackgroundWorkers/DefaultDynamicBackgroundWorkerManager.cs

@@ -14,6 +14,12 @@ public class DefaultDynamicBackgroundWorkerManager : IDynamicBackgroundWorkerMan
 {
     protected IServiceProvider ServiceProvider { get; }
     public ILogger<DefaultDynamicBackgroundWorkerManager> Logger { get; set; }
+    public virtual DynamicBackgroundWorkerManagerCapabilities Capabilities { get; } =
+        new DynamicBackgroundWorkerManagerCapabilities
+        {
+            SupportsDynamicRegistration = true,
+            SupportsCronExpression = false
+        };
 
     private readonly ConcurrentDictionary<string, InMemoryDynamicBackgroundWorker> _dynamicWorkers;
     private readonly SemaphoreSlim _semaphore;
@@ -39,11 +45,11 @@ public class DefaultDynamicBackgroundWorkerManager : IDynamicBackgroundWorkerMan
 
         schedule.Validate();
 
-        if (schedule.Period == null)
+        if (!schedule.CronExpression.IsNullOrWhiteSpace())
         {
             throw new AbpException(
-                $"The default in-memory background worker manager does not support CronExpression without Period for dynamic worker '{workerName}'. " +
+                $"The default in-memory background worker manager does not support CronExpression for dynamic worker '{workerName}'. " +
-                "Please set Period, or use a scheduler-backed provider (Hangfire, Quartz, TickerQ).");
+                "Please set Period, or use a scheduler-backed provider (Hangfire or Quartz).");
         }
 
         await _semaphore.WaitAsync(cancellationToken);
@@ -102,11 +108,11 @@ public class DefaultDynamicBackgroundWorkerManager : IDynamicBackgroundWorkerMan
 
         schedule.Validate();
 
-        if (schedule.Period == null)
+        if (!schedule.CronExpression.IsNullOrWhiteSpace())
         {
             throw new AbpException(
-                $"The default in-memory background worker manager does not support CronExpression without Period for dynamic worker '{workerName}'. " +
+                $"The default in-memory background worker manager does not support CronExpression for dynamic worker '{workerName}'. " +
-                "Please set Period, or use a scheduler-backed provider (Hangfire, Quartz, TickerQ).");
+                "Please set Period, or use a scheduler-backed provider (Hangfire or Quartz).");
         }
 
         await _semaphore.WaitAsync(cancellationToken);

framework/src/Volo.Abp.BackgroundWorkers/Volo/Abp/BackgroundWorkers/DynamicBackgroundWorkerManagerCapabilities.cs

@@ -0,0 +1,8 @@
+namespace Volo.Abp.BackgroundWorkers;
+
+public class DynamicBackgroundWorkerManagerCapabilities
+{
+    public bool SupportsDynamicRegistration { get; set; } = true;
+
+    public bool SupportsCronExpression { get; set; } = true;
+}

framework/src/Volo.Abp.BackgroundWorkers/Volo/Abp/BackgroundWorkers/IDynamicBackgroundWorkerManager.cs

@@ -9,6 +9,11 @@ namespace Volo.Abp.BackgroundWorkers;
 /// </summary>
 public interface IDynamicBackgroundWorkerManager
 {
+    /// <summary>
+    /// Describes the scheduling and runtime-registration capabilities of the active dynamic worker provider.
+    /// </summary>
+    DynamicBackgroundWorkerManagerCapabilities Capabilities { get; }
+
     /// <summary>
     /// Adds a dynamic worker by name, schedule and handler.
     /// If a worker with the same name already exists, it will be replaced.

framework/test/Volo.Abp.BackgroundJobs.Tests/Volo/Abp/BackgroundWorkers/DynamicBackgroundWorkerManager_Tests.cs

@@ -5,6 +5,7 @@ using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using Shouldly;
+using Volo.Abp;
 using Volo.Abp.BackgroundJobs;
 using Volo.Abp.BackgroundWorkers;
 using Xunit;
@@ -20,6 +21,13 @@ public class DynamicBackgroundWorkerManager_Tests : BackgroundJobsTestBase
         _dynamicWorkerManager = GetRequiredService<IDynamicBackgroundWorkerManager>();
     }
 
+    [Fact]
+    public void Should_Report_Provider_Capabilities()
+    {
+        _dynamicWorkerManager.Capabilities.SupportsDynamicRegistration.ShouldBeTrue();
+        _dynamicWorkerManager.Capabilities.SupportsCronExpression.ShouldBeFalse();
+    }
+
     [Fact]
     public async Task Should_Register_Dynamic_Worker()
     {
@@ -235,6 +243,25 @@ public class DynamicBackgroundWorkerManager_Tests : BackgroundJobsTestBase
         });
     }
 
+    [Fact]
+    public async Task Should_Throw_When_CronExpression_Is_Set()
+    {
+        var workerName = "dynamic-worker-" + Guid.NewGuid();
+
+        await Assert.ThrowsAsync<AbpException>(async () =>
+        {
+            await _dynamicWorkerManager.AddAsync(
+                workerName,
+                new DynamicBackgroundWorkerSchedule
+                {
+                    Period = 1000,
+                    CronExpression = "0 */5 * * * *"
+                },
+                (_, _) => Task.CompletedTask
+            );
+        });
+    }
+
     [Fact]
     public async Task Should_Continue_Running_After_Handler_Throws_Exception()
     {