我对 DI 和 Autofac 很陌生。我有一个单例类ProducerService，如下所示。这在 BackgroundService 的构造函数中用作依赖项。ProducerService 有一个构造函数注入依赖项，IKafkaProducerAggregate下面也列出了。
如何创建单个实例IKafkaProducerAggregate<TKey, Tvalue>以注入 ProducerService<TKey, TValue>？这包含一个IProducer来自外部 Kafka 融合 dotnet 库的实例，通过工厂方法IProducer<TKey, TValue> producer = new ProducerBuilder<TKey, TValue>(Config.Producer).Build();。我可以在 Autofac 中使用某种工厂方法来创建聚合实例并IProducer使用 Kafka 融合工厂方法进行初始化吗？
到目前为止，我有一个注册生产者服务的 Autofac 模块，并且正在努力理解如何使用类似于工厂方法的东西？？？这将在创建 ProducerService 时创建一个 IKafkaProducerAggregate ：
Assembly serializers = typeof(ConsumerService).GetTypeInfo().Assembly;
builder.RegisterGeneric(typeof(ProducerService<,>))
.As(typeof(IKafkaProducer<,>))
.SingleInstance();
接口：IKafkaProducerAggregate
public interface IKafkaProducerAggregate<TKey, TValue>
{
IProducer<TKey, TValue> Producer { get; }
Action<DeliveryReport<TKey, TValue>> DeliveryReportAction { get; }
}
类：生产者服务
namespace WebApp.Kafka
{
public class ProducerService<Key, Value> : IProducerService<Key, Value>, IDisposable
{
private bool Disposed { get; set; }
private IKafkaProducerAggregate<Key, Value> ProducerAggregate { get; }
private ILogger Logger { get; set; }
ProducerService(
IKafkaProducerAggregate<Key, Value> aggregate,
ILogger<ProducerService<Key, Value>> logger)
{
Logger = logger ?? throw new ArgumentNullException(nameof(logger));
ProducerAggregate = aggregate ?? throw new ArgumentNullException(nameof(aggregate));
Disposed = false;
Logger.LogInformation("ProducerService constructor called");
}
public void Produce(string topic, Key key, Value value)
{
ProducerAggregate.Producer.Produce(topic, new Message<Key, Value> { Key = key, Value = value }, ProducerAggregate.DeliveryReportAction);
Logger.LogInformation("Produce topic : {}, key : {}, value : {}", topic, key.ToString(), value.ToString());
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (!Disposed)
{
if (disposing)
{
Logger.LogInformation("Disposing Kafka producer...");
ProducerAggregate.Producer.Dispose();
}
Disposed = true;
}
}
~ProducerService()
{
Dispose(false);
}
}
}