[英]Dependency Injection With Autofac C# - Is It Possible To Specify A Factory Method When Registering A Generic Type
我对 DI 和 Autofac 很陌生。 我有一个单例类ProducerService
,如下所列。 这在 BackgroundService 的构造函数中用作依赖项。 ProducerService 有一个构造函数注入的依赖, IKafkaProducerAggregate
,也在下面列出。
如何创建IKafkaProducerAggregate<TKey, Tvalue>
的单个实例,该实例被创建以注入 ProducerService<TKey, TValue>? 这包含来自外部 Kafka IProducer
dotnet 库的IProducer
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使用 Kafka IProducer
工厂方法初始化IProducer
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??? 在创建 ProducerService 时将创建一个 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:ProducerService
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);
}
}
}
您不需要任何工厂来在构造函数中创建依赖项的新实例,您只需使用 InstancePerDependency 生命周期范围,而不是 SingleInstance。
https://autofaccn.readthedocs.io/en/latest/lifetime/instance-scope.html
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