Question

我在log4net周围有一个瘦的包装器，我正在尝试使用调用类的类型来使用log4net.LogManager从Castle.Windsor获取记录器。

public class Foo: IFoo
{
    private readonly ICommonLog _logger;

    public Foo(ICommonLog logger)
    {
        _logger = logger;
    }

    public void FooBar()
    {
        _logger.Info("Enter FooBar Method");
    }
}

public class CommonLog : ICommonLog
{
    private readonly log4net.ILog _logger;

    public CommonLog(Type loggerType)
    {
        _logger = log4net.LogManager.GetLogger(loggerType); 
    }

    public void Info(string message)
    {         
        _logger.Info(message.Cleanse());
    }

    // ...
}

我已在Castle.Windsor（2.5.1）中尝试过此注册，我可以为Foo获取正确的记录器。我是否错误地使用了此方案的动态参数？有更优雅的解决方案吗？

container.Register(Component.For<ICommonLog>().ImplementedBy(typeof(CommonLog)).
   LifeStyle.Transient);
container.Register(Component.For<IFoo>().ImplementedBy(typeof(Foo)).
   LifeStyle.Transient.DynamicParameters(
       (k, d) =>
       {
          var component = k.Resolve<ICommonLog>(new {loggerType = typeof (Foo)});
          d["logger"] = component;
          return r =>
          {
              if (component != null)
              {
                  r.ReleaseComponent(component);
              }
          };
       })
  );

编辑：我已使用ISubDependencyResolver更新了解决方案：

public class LoggerResolver : ISubDependencyResolver
{
    private readonly IKernel kernel;

    public LoggerResolver(IKernel kernel)
    {
        this.kernel = kernel;
    }

    public bool CanResolve(CreationContext context,
                           ISubDependencyResolver contextHandlerResolver,
                           ComponentModel model,
                           DependencyModel dependency)
    {
        return dependency.TargetType == typeof (ICommonLog);
    }

    public object Resolve(CreationContext context,
                          ISubDependencyResolver contextHandlerResolver,
                          ComponentModel model,
                          DependencyModel dependency)
    {
        if (CanResolve(context, contextHandlerResolver, model, dependency))
        {
            return kernel.Resolve<ICommonLog>(new {loggerType = model.Implementation});
        }
        return null;
    }
}

注册：

container.Register(Component.For<ICommonLog>().ImplementedBy(typeof(CommonLog))
    .LifeStyle.Transient);
container.Register(Component.For<IFoo().ImplementedBy(typeof(Foo))
    .LifeStyle.Transient);
container.Kernel.Resolver.AddSubResolver(new LoggerResolver(container.Kernel));

Answer 1

您无需注册CommonLog。您的子依赖解析器可以为您提供新的解析器。

container.Register(Component.For<IFoo>().ImplementedBy<Foo>().LifeStyle.Transient);
container.Kernel.Resolver.AddSubResolver(new LoggerResolver(container.Kernel));

public class LoggerResolver : ISubDependencyResolver
{
    ...

    public object Resolve(CreationContext context, ISubDependencyResolver contextHandlerResolver, ComponentModel model, DependencyModel dependency)
    {
        //No need to can resolve, Windsor will do this for you

        return new CommonLog(model.Implementation);
    }
}

编辑记录器提供程序的示例

container.Register(Component.For<ILoggerProvider>().ImplementedBy<Log4NetLoggerProvider >().LifeStyle.Transient);

public interface ICommonLoggerProvider
{
    ICommonLog GetLogger( Type type );
}

public class Log4NetLoggerProvider : ICommonLoggerProvider
{
    public ICommonLog GetLogger(Type type)
    {
        return new Log4NetLogger(type);
    }
}

public class LoggerResolver : ISubDependencyResolver
{
    ...
    public object Resolve( CreationContext context, ISubDependencyResolver contextHandlerResolver, Castle.Core.ComponentModel model, DependencyModel dependency )
    {
        return kernel.Resolve<ICommonLoggerProvider>().GetLogger( model.Implementation );
    }
}

使用Castle Windsor通过调用者类型依赖Log4Net Logger和检索记录器

1 个答案: