Fix dynamic background job code review issues

framework/src/Volo.Abp.BackgroundJobs.Abstractions/Volo/Abp/BackgroundJobs/DefaultDynamicBackgroundJobManager.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Concurrent;
 using System.Linq;
+using System.Linq.Expressions;
 using System.Reflection;
 using System.Threading.Tasks;
 using Microsoft.Extensions.Options;
@@ -11,7 +12,7 @@ namespace Volo.Abp.BackgroundJobs;
 
 public class DefaultDynamicBackgroundJobManager : IDynamicBackgroundJobManager, ITransientDependency
 {
-    private static readonly ConcurrentDictionary<Type, MethodInfo> EnqueueMethodCache = new();
+    private static readonly ConcurrentDictionary<Type, Func<IBackgroundJobManager, object, BackgroundJobPriority, TimeSpan?, Task<string>>> EnqueueDelegateCache = new();
 
     protected IBackgroundJobManager BackgroundJobManager { get; }
     protected IDynamicBackgroundJobHandlerRegistry HandlerRegistry { get; }
@@ -83,9 +84,8 @@ public class DefaultDynamicBackgroundJobManager : IDynamicBackgroundJobManager,
         var json = JsonSerializer.Serialize(args);
         var typedArgs = JsonSerializer.Deserialize(argsType, json);
 
-        var enqueueMethod = GetOrCreateEnqueueMethod(argsType);
-        var task = (Task<string>)enqueueMethod.Invoke(BackgroundJobManager, [typedArgs, priority, delay])!;
-        return await task;
+        var enqueueDelegate = GetOrCreateEnqueueDelegate(argsType);
+        return await enqueueDelegate(BackgroundJobManager, typedArgs, priority, delay);
     }
 
     protected virtual Task<string> EnqueueDynamicHandlerJobAsync(
@@ -99,15 +99,39 @@ public class DefaultDynamicBackgroundJobManager : IDynamicBackgroundJobManager,
         return BackgroundJobManager.EnqueueAsync(dynamicArgs, priority, delay);
     }
 
-    private static MethodInfo GetOrCreateEnqueueMethod(Type argsType)
+    private static Func<IBackgroundJobManager, object, BackgroundJobPriority, TimeSpan?, Task<string>> GetOrCreateEnqueueDelegate(Type argsType)
     {
-        return EnqueueMethodCache.GetOrAdd(argsType, static type =>
+        return EnqueueDelegateCache.GetOrAdd(argsType, static type =>
         {
             var method = typeof(IBackgroundJobManager)
                 .GetMethods(BindingFlags.Public | BindingFlags.Instance)
-                .Single(m => m.Name == nameof(IBackgroundJobManager.EnqueueAsync) && m.IsGenericMethodDefinition);
-
-            return method.MakeGenericMethod(type);
+                .FirstOrDefault(m => m.Name == nameof(IBackgroundJobManager.EnqueueAsync)
+                                     && m.IsGenericMethodDefinition
+                                     && m.GetParameters().Length == 3);
+
+            if (method == null)
+            {
+                throw new AbpException(
+                    $"Could not find the generic EnqueueAsync method on {nameof(IBackgroundJobManager)}.");
+            }
+
+            var genericMethod = method.MakeGenericMethod(type);
+
+            // Build: (manager, args, priority, delay) => manager.EnqueueAsync<TArgs>((TArgs)args, priority, delay)
+            var managerParam = Expression.Parameter(typeof(IBackgroundJobManager), "manager");
+            var argsParam = Expression.Parameter(typeof(object), "args");
+            var priorityParam = Expression.Parameter(typeof(BackgroundJobPriority), "priority");
+            var delayParam = Expression.Parameter(typeof(TimeSpan?), "delay");
+
+            var call = Expression.Call(
+                managerParam,
+                genericMethod,
+                Expression.Convert(argsParam, type),
+                priorityParam,
+                delayParam);
+
+            return Expression.Lambda<Func<IBackgroundJobManager, object, BackgroundJobPriority, TimeSpan?, Task<string>>>(
+                call, managerParam, argsParam, priorityParam, delayParam).Compile();
         });
     }
 }

framework/src/Volo.Abp.BackgroundJobs.Abstractions/Volo/Abp/BackgroundJobs/DynamicBackgroundJobArgs.cs

@@ -12,6 +12,6 @@ public class DynamicBackgroundJobArgs
     public DynamicBackgroundJobArgs(string jobName, string jsonData)
     {
         JobName = Check.NotNullOrWhiteSpace(jobName, nameof(jobName));
-        JsonData = Check.NotNull(jsonData, nameof(jsonData));
+        JsonData = Check.NotNullOrWhiteSpace(jsonData, nameof(jsonData));
     }
 }

framework/test/Volo.Abp.BackgroundJobs.Tests/Volo/Abp/BackgroundJobs/BackgroundJobManager_Tests.cs

@@ -81,7 +81,7 @@ public class BackgroundJobManager_Tests : BackgroundJobsTestBase
     [Fact]
     public async Task Should_Execute_Dynamic_Handler_Job()
     {
-        _tracker.ExecutedJsonData.ShouldBeEmpty();
+        _tracker.ExecutedJsonData.IsEmpty.ShouldBeTrue();
 
         await _backgroundJobExecuter.ExecuteAsync(
             new JobExecutionContext(
@@ -100,13 +100,20 @@ public class BackgroundJobManager_Tests : BackgroundJobsTestBase
         var typedJobName = BackgroundJobNameAttribute.GetName<MyJobArgs>();
         _dynamicBackgroundJobManager.RegisterHandler(typedJobName, (_, _) => Task.CompletedTask);
 
-        var jobIdAsString = await _dynamicBackgroundJobManager.EnqueueAsync(typedJobName, new { Value = "42" });
-        jobIdAsString.ShouldNotBe(default);
-
-        var jobInfo = await _backgroundJobStore.FindAsync(Guid.Parse(jobIdAsString));
-        jobInfo.ShouldNotBeNull();
-        jobInfo.JobName.ShouldBe(typedJobName);
-        jobInfo.JobName.ShouldNotBe(DynamicBackgroundJobArgs.JobNameConstant);
+        try
+        {
+            var jobIdAsString = await _dynamicBackgroundJobManager.EnqueueAsync(typedJobName, new { Value = "42" });
+            jobIdAsString.ShouldNotBe(default);
+
+            var jobInfo = await _backgroundJobStore.FindAsync(Guid.Parse(jobIdAsString));
+            jobInfo.ShouldNotBeNull();
+            jobInfo.JobName.ShouldBe(typedJobName);
+            jobInfo.JobName.ShouldNotBe(DynamicBackgroundJobArgs.JobNameConstant);
+        }
+        finally
+        {
+            _dynamicBackgroundJobManager.UnregisterHandler(typedJobName);
+        }
     }
 
     [Fact]

framework/test/Volo.Abp.BackgroundJobs.Tests/Volo/Abp/BackgroundJobs/DynamicJobExecutionTracker.cs

@@ -1,8 +1,8 @@
-using System.Collections.Generic;
+using System.Collections.Concurrent;
 
 namespace Volo.Abp.BackgroundJobs;
 
 public class DynamicJobExecutionTracker
 {
-    public List<string> ExecutedJsonData { get; } = new();
+    public ConcurrentBag<string> ExecutedJsonData { get; } = new();
 }