.

src/BuildingBlocks/Core/Event/EventType.cs

@@ -4,5 +4,5 @@ namespace BuildingBlocks.Core.Event;
 public enum EventType
 {
     IntegrationEvent = 1,
-    DomainEvent = 2,
+    DomainEvent = 2
 }

src/BuildingBlocks/Core/Event/IDomainEvent.cs

@@ -2,5 +2,4 @@ namespace BuildingBlocks.Core.Event;
 
 public interface IDomainEvent : IEvent
 {
-
 }

src/BuildingBlocks/Core/EventDispatcher.cs

@@ -30,17 +30,12 @@ public sealed class EventDispatcher : IEventDispatcher
         _httpContextAccessor = httpContextAccessor;
     }
 
-    public async Task SendAsync(IDomainEvent domainEvent,
-        CancellationToken cancellationToken = default) => await SendAsync(new[] {domainEvent}, cancellationToken);
 
-    public async Task SendAsync(IReadOnlyList<IDomainEvent> domainEvents, CancellationToken cancellationToken = default)
+    public async Task SendAsync<T>(IReadOnlyList<T> events, CancellationToken cancellationToken = default)
+        where T : IEvent
+    {
+        async Task PublishIntegrationEvent(IReadOnlyList<IIntegrationEvent> integrationEvents)
         {
-        if (domainEvents is null) return;
-
-        var integrationEvents = await MapDomainEventToIntegrationEventAsync(domainEvents).ConfigureAwait(false);
-
-        if (integrationEvents.Count == 0) return;
-
             foreach (var integrationEvent in integrationEvents)
             {
                 await _persistMessageProcessor.PublishMessageAsync(new MessageEnvelope(integrationEvent, SetHeaders()),
@@ -48,19 +43,31 @@ public sealed class EventDispatcher : IEventDispatcher
             }
         }
 
-
+        if (events.Count > 0)
-    public async Task SendAsync(IIntegrationEvent integrationEvent,
-        CancellationToken cancellationToken = default) => await SendAsync(new[] {integrationEvent}, cancellationToken);
-
-    public async Task SendAsync(IReadOnlyList<IIntegrationEvent> integrationEvents,
-        CancellationToken cancellationToken = default)
         {
-        if (integrationEvents is null) return;
+            switch (events)
+            {
+                case IReadOnlyList<IDomainEvent> domainEvents:
+                {
+                    var integrationEvents = await MapDomainEventToIntegrationEventAsync(domainEvents)
+                        .ConfigureAwait(false);
 
-        await _persistMessageProcessor.PublishMessageAsync(new MessageEnvelope(integrationEvents, SetHeaders()),
+                    await PublishIntegrationEvent(integrationEvents);
-            cancellationToken);
+                    break;
                 }
 
+                case IReadOnlyList<IIntegrationEvent> integrationEvents:
+                    await PublishIntegrationEvent(integrationEvents);
+                    break;
+            }
+        }
+    }
+
+    public async Task SendAsync<T>(T @event, CancellationToken cancellationToken = default)
+        where T : IEvent =>
+        await SendAsync(new[] {@event}, cancellationToken);
+
+
     private Task<IReadOnlyList<IIntegrationEvent>> MapDomainEventToIntegrationEventAsync(
         IReadOnlyList<IDomainEvent> events)
     {

src/BuildingBlocks/Core/IEventDispatcher.cs

@@ -4,9 +4,8 @@ namespace BuildingBlocks.Core;
 
 public interface IEventDispatcher
 {
-    public Task SendAsync(IReadOnlyList<IDomainEvent> domainEvents, CancellationToken cancellationToken = default);
+    public Task SendAsync<T>(IReadOnlyList<T> events, CancellationToken cancellationToken = default)
-    public Task SendAsync(IDomainEvent domainEvent, CancellationToken cancellationToken = default);
+        where T : IEvent;
-
+    public Task SendAsync<T>(T @event, CancellationToken cancellationToken = default)
-    public Task SendAsync(IIntegrationEvent integrationEvent, CancellationToken cancellationToken = default);
+        where T : IEvent;
-    public Task SendAsync(IReadOnlyList<IIntegrationEvent> integrationEvents, CancellationToken cancellationToken = default);
 }

src/BuildingBlocks/EFCore/EfTxBehavior.cs

@@ -1,6 +1,7 @@
 using System.Data;
 using System.Text.Json;
 using BuildingBlocks.Core;
+using BuildingBlocks.Core.Event;
 using MediatR;
 using Microsoft.Extensions.Logging;
 

src/Services/Flight/src/Flight/Flights/Features/CreateFlight/Reads/CreateFlightMongoCommandHandler.cs

@@ -1,11 +1,15 @@
-using System.Threading;
+using System.Linq;
+using System.Threading;
 using System.Threading.Tasks;
 using Ardalis.GuardClauses;
 using BuildingBlocks.Core.CQRS;
 using Flight.Data;
+using Flight.Flights.Exceptions;
 using Flight.Flights.Models.Reads;
 using MapsterMapper;
 using MediatR;
+using MongoDB.Driver;
+using MongoDB.Driver.Linq;
 
 namespace Flight.Flights.Features.CreateFlight.Reads;
 
@@ -28,6 +32,12 @@ public class CreateFlightMongoCommandHandler : ICommandHandler<CreateFlightMongo
 
         var flightReadModel = _mapper.Map<FlightReadModel>(command);
 
+        var flight = await _flightReadDbContext.Flight.AsQueryable()
+            .FirstOrDefaultAsync(x => x.Id == command.Id, cancellationToken);
+
+        if (flight is not null)
+            throw new FlightAlreadyExistException();
+
         await _flightReadDbContext.Flight.InsertOneAsync(flightReadModel, cancellationToken: cancellationToken);
 
         return Unit.Value;