eShopOnContainers/src/BuildingBlocks/EventBus/EventBusDependencyInjection/Extensions/EventBusRabbitMqServiceCollectionExtensions.cs

namespace Microsoft.Extensions.DependencyInjection
{
    using Autofac;
    using Microsoft.eShopOnContainers.BuildingBlocks.EventBus;
    using Microsoft.eShopOnContainers.BuildingBlocks.EventBus.Abstractions;
    using Microsoft.eShopOnContainers.BuildingBlocks.EventBusRabbitMQ;
    using Microsoft.Extensions.Configuration;
    using Microsoft.Extensions.DependencyInjection;
    using Microsoft.Extensions.Logging;
    using RabbitMQ.Client;
    using System.Linq;
    using System.Reflection;

    public static class EventBusRabbitMqServiceCollectionExtensions
    {
        public static IServiceCollection AddEventBusRabbitMq(this IServiceCollection services, IConfiguration configuration)
        {
            services.AddRabbitMQ(configuration);

            var subscriptionClientName = configuration["SubscriptionClientName"];

            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>();

            return services;
        }

        private static IServiceCollection AddRabbitMQ(this IServiceCollection services, IConfiguration Configuration)
        {
            services.AddSingleton<IRabbitMQPersistentConnection>(sp =>
            {
                var logger = sp.GetRequiredService<ILogger<DefaultRabbitMQPersistentConnection>>();


                var factory = new ConnectionFactory()
                {
                    HostName = Configuration["EventBusConnection"],
                    DispatchConsumersAsync = true
                };

                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"]))
                {
                    retryCount = int.Parse(Configuration["EventBusRetryCount"]);
                }

                return new DefaultRabbitMQPersistentConnection(factory, logger, retryCount);
            });

            return services;
        }




    }
}