Refactor Locations Api eventbus using CAP

src/Services/Location/Locations.API/Infrastructure/Services/LocationsService.cs

@@ -1,6 +1,7 @@
-namespace Microsoft.eShopOnContainers.Services.Locations.API.Infrastructure.Services
+using DotNetCore.CAP;
+
+namespace Microsoft.eShopOnContainers.Services.Locations.API.Infrastructure.Services
 {
-    using Microsoft.eShopOnContainers.BuildingBlocks.EventBus.Abstractions;
     using Microsoft.eShopOnContainers.Services.Locations.API.Infrastructure.Exceptions;
     using Microsoft.eShopOnContainers.Services.Locations.API.Infrastructure.Repositories;
     using Microsoft.eShopOnContainers.Services.Locations.API.IntegrationEvents.Events;
@@ -14,12 +15,12 @@
     public class LocationsService : ILocationsService
     {
         private readonly ILocationsRepository _locationsRepository;
-        private readonly IEventBus _eventBus;
+        private readonly ICapPublisher _eventBus;
         private readonly ILogger<LocationsService> _logger;
 
         public LocationsService(
             ILocationsRepository locationsRepository,
-            IEventBus eventBus,
+            ICapPublisher eventBus,
             ILogger<LocationsService> logger)
         {
             _locationsRepository = locationsRepository ?? throw new ArgumentNullException(nameof(locationsRepository));
@@ -73,9 +74,9 @@
             var newUserLocations = MapUserLocationDetails(newLocations);
             var @event = new UserLocationUpdatedIntegrationEvent(userId, newUserLocations);
 
-            _logger.LogInformation("----- Publishing integration event: {IntegrationEventId} from {AppName} - ({@IntegrationEvent})", @event.Id, Program.AppName, @event);
+            _logger.LogInformation("----- Publishing integration event: {AppName} - ({@IntegrationEvent})", Program.AppName, @event);
 
-            _eventBus.Publish(@event);
+            _eventBus.Publish(nameof(UserLocationUpdatedIntegrationEvent), @event);
         }
 
         private List<UserLocationDetails> MapUserLocationDetails(List<Locations> newLocations)

src/Services/Location/Locations.API/IntegrationEvents/Events/UserLocationUpdatedIntegrationEvent.cs

@@ -1,12 +1,12 @@
 namespace Microsoft.eShopOnContainers.Services.Locations.API.IntegrationEvents.Events
 {
     using Locations.API.Model;
-    using Microsoft.eShopOnContainers.BuildingBlocks.EventBus.Events;
     using System.Collections.Generic;
 
-    public class UserLocationUpdatedIntegrationEvent : IntegrationEvent
+    public class UserLocationUpdatedIntegrationEvent
     {
         public string UserId { get; set; }
+
         public List<UserLocationDetails> LocationList { get; set; }
 
         public UserLocationUpdatedIntegrationEvent(string userId, List<UserLocationDetails> locationList)

src/Services/Location/Locations.API/Locations.API.csproj

@@ -11,6 +11,10 @@
     <PackageReference Include="AspNetCore.HealthChecks.Rabbitmq" Version="2.2.0" />
     <PackageReference Include="AspNetCore.HealthChecks.UI.Client" Version="2.2.2" />
     <PackageReference Include="Autofac.Extensions.DependencyInjection" Version="4.2.1" />
+    <PackageReference Include="DotNetCore.CAP" Version="2.5.0-preview-69210974" />
+    <PackageReference Include="DotNetCore.CAP.AzureServiceBus" Version="2.5.0-preview-69210974" />
+    <PackageReference Include="DotNetCore.CAP.RabbitMQ" Version="2.5.0-preview-69210974" />
+    <PackageReference Include="DotNetCore.CAP.MongoDB" Version="2.5.0-preview-69210974" />
     <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.2.1" />
     <PackageReference Include="Microsoft.ApplicationInsights.DependencyCollector" Version="2.6.1" />
     <PackageReference Include="Microsoft.ApplicationInsights.Kubernetes" Version="1.0.2" />
@@ -20,22 +24,16 @@
     <PackageReference Include="Microsoft.AspNetCore.HealthChecks" Version="1.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.AzureKeyVault" Version="2.2.0" />
     <PackageReference Include="Microsoft.Extensions.Logging.AzureAppServices" Version="2.2.0" />
-    <PackageReference Include="mongocsharpdriver" Version="2.5.0" />
-    <PackageReference Include="MongoDB.Bson" Version="2.5.0" />
-    <PackageReference Include="MongoDB.Driver" Version="2.5.0" />
-    <PackageReference Include="MongoDB.Driver.Core" Version="2.5.0" />
+    <PackageReference Include="mongocsharpdriver" Version="2.7.2" />
+    <PackageReference Include="MongoDB.Bson" Version="2.7.2" />
+    <PackageReference Include="MongoDB.Driver" Version="2.7.2" />
+    <PackageReference Include="MongoDB.Driver.Core" Version="2.7.2" />
     <PackageReference Include="Serilog.AspNetCore" Version="2.1.1" />
     <PackageReference Include="Serilog.Enrichers.Environment" Version="2.1.2" />
     <PackageReference Include="Serilog.Settings.Configuration" Version="3.0.1" />
     <PackageReference Include="Serilog.Sinks.Console" Version="3.1.1" />
     <PackageReference Include="Serilog.Sinks.Seq" Version="4.0.0" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="3.0.0" />
-  </ItemGroup>
-
-  <ItemGroup>
-    <ProjectReference Include="..\..\..\BuildingBlocks\EventBus\EventBusRabbitMQ\EventBusRabbitMQ.csproj" />
-    <ProjectReference Include="..\..\..\BuildingBlocks\EventBus\EventBusServiceBus\EventBusServiceBus.csproj" />
-    <ProjectReference Include="..\..\..\BuildingBlocks\EventBus\EventBus\EventBus.csproj" />
-  </ItemGroup>
+  </ItemGroup> 
 
 </Project>

src/Services/Location/Locations.API/Startup.cs

@@ -9,11 +9,6 @@ using Microsoft.AspNetCore.Diagnostics.HealthChecks;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
-using Microsoft.Azure.ServiceBus;
-using Microsoft.eShopOnContainers.BuildingBlocks.EventBus;
-using Microsoft.eShopOnContainers.BuildingBlocks.EventBus.Abstractions;
-using Microsoft.eShopOnContainers.BuildingBlocks.EventBusRabbitMQ;
-using Microsoft.eShopOnContainers.BuildingBlocks.EventBusServiceBus;
 using Microsoft.eShopOnContainers.Services.Locations.API.Infrastructure;
 using Microsoft.eShopOnContainers.Services.Locations.API.Infrastructure.Filters;
 using Microsoft.eShopOnContainers.Services.Locations.API.Infrastructure.Middlewares;
@@ -57,50 +52,45 @@ namespace Microsoft.eShopOnContainers.Services.Locations.API
 
             services.Configure<LocationSettings>(Configuration);
 
-            if (Configuration.GetValue<bool>("AzureServiceBusEnabled"))
+            services.AddCap(options =>
             {
-                services.AddSingleton<IServiceBusPersisterConnection>(sp =>
+                // using MongoDB as the event storage
+                options.UseMongoDB(configure =>
                 {
-                    var logger = sp.GetRequiredService<ILogger<DefaultServiceBusPersisterConnection>>();
-
-                    var serviceBusConnectionString = Configuration["EventBusConnection"];
-                    var serviceBusConnection = new ServiceBusConnectionStringBuilder(serviceBusConnectionString);
-
-                    return new DefaultServiceBusPersisterConnection(serviceBusConnection, logger);
+                    configure.DatabaseConnection = Configuration["ConnectionString"];
+                    configure.DatabaseName= Configuration["Database"];
                 });
-            }
-            else
-            {
-                services.AddSingleton<IRabbitMQPersistentConnection>(sp =>
-                {
-                    var logger = sp.GetRequiredService<ILogger<DefaultRabbitMQPersistentConnection>>();
-
-                    var factory = new ConnectionFactory()
-                    {
-                        HostName = Configuration["EventBusConnection"]
-                    };
-
-                    if (!string.IsNullOrEmpty(Configuration["EventBusUserName"]))
-                    {
-                        factory.UserName = Configuration["EventBusUserName"];
-                    }
 
-                    if (!string.IsNullOrEmpty(Configuration["EventBusPassword"]))
-                    {
-                        factory.Password = Configuration["EventBusPassword"];
-                    }
-
-                    var retryCount = 5;
-                    if (!string.IsNullOrEmpty(Configuration["EventBusRetryCount"]))
+                if (Configuration.GetValue<bool>("AzureServiceBusEnabled"))
+                {
+                    options.UseAzureServiceBus(Configuration["EventBusConnection"]);
+                }
+                else
+                {
+                    options.UseRabbitMQ(conf =>
                     {
-                        retryCount = int.Parse(Configuration["EventBusRetryCount"]);
-                    }
-
-                    return new DefaultRabbitMQPersistentConnection(factory, logger, retryCount);
-                });
-            }            
+                        conf.HostName = Configuration["EventBusConnection"];
+                        if (!string.IsNullOrEmpty(Configuration["EventBusUserName"]))
+                        {
+                            conf.UserName = Configuration["EventBusUserName"];
+                        }
+                        if (!string.IsNullOrEmpty(Configuration["EventBusPassword"]))
+                        {
+                            conf.Password = Configuration["EventBusPassword"];
+                        }
+                    });
+                }
+
+                if (!string.IsNullOrEmpty(Configuration["EventBusRetryCount"]))
+                {
+                    options.FailedRetryCount = int.Parse(Configuration["EventBusRetryCount"]);
+                }
 
-            RegisterEventBus(services);
+                if (!string.IsNullOrEmpty(Configuration["SubscriptionClientName"]))
+                {
+                    options.DefaultGroup = Configuration["SubscriptionClientName"];
+                }
+            });
 
             // Add framework services.
             services.AddSwaggerGen(options =>
@@ -238,45 +228,6 @@ namespace Microsoft.eShopOnContainers.Services.Locations.API
 
             app.UseAuthentication();
         }
-
-        private void RegisterEventBus(IServiceCollection services)
-        {
-            var subscriptionClientName = Configuration["SubscriptionClientName"];
-
-            if (Configuration.GetValue<bool>("AzureServiceBusEnabled"))
-            {
-                services.AddSingleton<IEventBus, EventBusServiceBus>(sp =>
-                {
-                    var serviceBusPersisterConnection = sp.GetRequiredService<IServiceBusPersisterConnection>();
-                    var iLifetimeScope = sp.GetRequiredService<ILifetimeScope>();
-                    var logger = sp.GetRequiredService<ILogger<EventBusServiceBus>>();
-                    var eventBusSubcriptionsManager = sp.GetRequiredService<IEventBusSubscriptionsManager>();
-
-                    return new EventBusServiceBus(serviceBusPersisterConnection, logger,
-                        eventBusSubcriptionsManager, subscriptionClientName, iLifetimeScope);
-                });
-            }
-            else
-            {
-                services.AddSingleton<IEventBus, EventBusRabbitMQ>(sp =>
-                {
-                    var rabbitMQPersistentConnection = sp.GetRequiredService<IRabbitMQPersistentConnection>();
-                    var iLifetimeScope = sp.GetRequiredService<ILifetimeScope>();
-                    var logger = sp.GetRequiredService<ILogger<EventBusRabbitMQ>>();
-                    var eventBusSubcriptionsManager = sp.GetRequiredService<IEventBusSubscriptionsManager>();
-
-                    var retryCount = 5;
-                    if (!string.IsNullOrEmpty(Configuration["EventBusRetryCount"]))
-                    {
-                        retryCount = int.Parse(Configuration["EventBusRetryCount"]);
-                    }
-
-                    return new EventBusRabbitMQ(rabbitMQPersistentConnection, logger, iLifetimeScope, eventBusSubcriptionsManager, subscriptionClientName, retryCount);
-                });
-            }
-
-            services.AddSingleton<IEventBusSubscriptionsManager, InMemoryEventBusSubscriptionsManager>();
-        }
     }
 
     public static class CustomExtensionMethods