Anonymous Rebus events support; demo bootstrap

RebusDistributedEventBus: properly handle AnonymousEventData by extracting its EventName when processing, wrap deserialized anonymous payloads into AnonymousEventData, and subscribe to AnonymousEventData when the first anonymous handler is registered (note: a TODO about multi-threading remains).

DistDemoApp.MongoDbRebus Program: replace the previous Host/Serilog-driven async Main with an ABP application bootstrap using AbpApplicationFactory. The new Main initializes the ABP app, runs DemoService.CreateTodoItemAsync via AsyncHelper.RunSync, and then shuts down; prior Serilog/host startup code has been commented out and ABP logging/Serilog services are wired up.

framework/src/Volo.Abp.EventBus.Rebus/Volo/Abp/EventBus/Rebus/RebusDistributedEventBus.cs

@@ -75,7 +75,15 @@ public class RebusDistributedEventBus : DistributedEventBusBase, ISingletonDepen
     public async Task ProcessEventAsync(Type eventType, object eventData)
     {
         var messageId = MessageContext.Current.TransportMessage.GetMessageId();
-        var eventName = EventNameAttribute.GetNameOrDefault(eventType);
+        string eventName;
+        if (eventType == typeof(AnonymousEventData) && eventData is AnonymousEventData anonymousEventData)
+        {
+            eventName = anonymousEventData.EventName;
+        }
+        else
+        {
+            eventName = EventNameAttribute.GetNameOrDefault(eventType);
+        }
         var correlationId = MessageContext.Current.Headers.GetOrDefault(EventBusConsts.CorrelationIdHeaderName);
 
         if (await AddToInboxAsync(messageId, eventName, eventType, eventData, correlationId))
@@ -119,6 +127,11 @@ public class RebusDistributedEventBus : DistributedEventBusBase, ISingletonDepen
         }
 
         handlerFactories.Add(handler);
+        
+        if (AnonymousHandlerFactories.Count == 1) //TODO: Multi-threading!
+        {
+            Rebus.Subscribe(typeof(AnonymousEventData));
+        }
 
         return new AnonymousEventHandlerFactoryUnregistrar(this, eventName, handler);
     }
@@ -224,7 +237,7 @@ public class RebusDistributedEventBus : DistributedEventBusBase, ISingletonDepen
         }
         else if (AnonymousHandlerFactories.ContainsKey(outgoingEvent.EventName))
         {
-            eventData = Serializer.Deserialize(outgoingEvent.EventData, typeof(object));
+            eventData = new AnonymousEventData(outgoingEvent.EventName, Serializer.Deserialize(outgoingEvent.EventData, typeof(object)));
             eventType = typeof(AnonymousEventData);
         }
         else

test/DistEvents/DistDemoApp.MongoDbRebus/Program.cs

@@ -4,39 +4,67 @@ using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 using Serilog;
 using Serilog.Events;
+using Volo.Abp;
+using Volo.Abp.Threading;
 
 namespace DistDemoApp
 {
     public class Program
     {
-        public static async Task<int> Main(string[] args)
+        public static void Main(string[] args)
         {
-            Log.Logger = new LoggerConfiguration()
-#if DEBUG
-                .MinimumLevel.Debug()
-#else
-                .MinimumLevel.Information()
-#endif
-                .MinimumLevel.Override("Microsoft", LogEventLevel.Warning)
-                .Enrich.FromLogContext()
-                .WriteTo.Async(c => c.File("Logs/logs.txt"))
-                .WriteTo.Async(c => c.Console())
-                .CreateLogger();
+//             Log.Logger = new LoggerConfiguration()
+// #if DEBUG
+//                 .MinimumLevel.Debug()
+// #else
+//                 .MinimumLevel.Information()
+// #endif
+//                 .MinimumLevel.Override("Microsoft", LogEventLevel.Warning)
+//                 .Enrich.FromLogContext()
+//                 .WriteTo.Async(c => c.File("Logs/logs.txt"))
+//                 .WriteTo.Async(c => c.Console())
+//                 .CreateLogger();
+//
+//             try
+//             {
+//                 Log.Information("Starting console host.");
+//                 await CreateHostBuilder(args).RunConsoleAsync();
+//                 return 0;
+//             }
+//             catch (Exception ex)
+//             {
+//                 Log.Fatal(ex, "Host terminated unexpectedly!");
+//                 return 1;
+//             }
+//             finally
+//             {
+//                 Log.CloseAndFlush();
+//             }
 
-            try
+            using (var application = AbpApplicationFactory.Create<DistDemoAppMongoDbRebusModule>(options =>
+                   {
+                       options.UseAutofac();
+                       options.Services.AddSerilog((serviceProvider, c) =>
+                       {
+                           // c.Enrich.FromLogContext()
+                           //     .WriteTo.Async(c => c.File("Logs/logs.txt"))
+                           //     .WriteTo.Async(c => c.Console())
+                           //      .WriteTo.AbpStudio(serviceProvider);
+                       });
+                       options.Services.AddLogging(c => c.AddSerilog());
+                   }))
             {
-                Log.Information("Starting console host.");
-                await CreateHostBuilder(args).RunConsoleAsync();
-                return 0;
-            }
-            catch (Exception ex)
-            {
-                Log.Fatal(ex, "Host terminated unexpectedly!");
-                return 1;
-            }
-            finally
-            {
-                Log.CloseAndFlush();
+                Log.Information("Starting Volo.AbpIo.DbMigrator.");
+                
+                application.Initialize();
+
+                AsyncHelper.RunSync(
+                    () => application
+                        .ServiceProvider
+                        .GetRequiredService<DemoService>().CreateTodoItemAsync()
+                );
+
+                application.Shutdown(); 
             }
 
         }