4

我目前正在使用城堡温莎，以及它在我的应用程序中的日志记录工具。

但是，在我的日志记录中，我想包含一些上下文信息，这些信息不在记录的消息中，而是存储在CallContext.

我试图通过拦截ILogger使用以下内容的调用来做到这一点：

internal class Program
{
    private static void Main(string[] args)
    {
        var container = new WindsorContainer();
        container.AddFacility<LoggingFacility>(f => f.UseNLog());
        container.Kernel.Resolver.AddSubResolver(new LoggerResolver(container.Kernel));

        var logger = container.Resolve<ILogger>();
    }
}

public class LoggerResolver: ISubDependencyResolver
{
    private readonly IKernel _kernel;
    private static ProxyGenerator _proxyGenerator;

    static LoggerResolver()
    {
        _proxyGenerator = new ProxyGenerator();
    }

    public LoggerResolver(IKernel kernel)
    {
        _kernel = kernel;
    }

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

    public object Resolve(CreationContext context, ISubDependencyResolver contextHandlerResolver, ComponentModel model, DependencyModel dependency)
    {
        return _proxyGenerator.CreateInterfaceProxyWithTarget(_kernel.Resolve<ILogger>(), new LoggingInterceptor());
    }
}

public class LoggingInterceptor: IInterceptor
{
    public void Intercept(IInvocation invocation)
    {
        //Some modification to message here
        invocation.Proceed();
    }
}

但是变量logger是类型NLog.Loggger而不是我期望的动态代理。

4

1 回答 1

2

使用 ILSpy 进行的一些挖掘似乎表明您将无法拦截对ILogger实例化的调用。ILogger实例是由NLogFactory（我查看的所有日志工厂、log4net、控制台等）直接创建的

// Castle.Services.Logging.NLogIntegration.NLogFactory
public override ILogger Create(string name)
{
    Logger logger = LogManager.GetLogger(name);
    return new NLogLogger(logger, this);
}

如果这确实有必要，您应该能够继承您感兴趣的工厂（基本上，NLogFactory和ExtendedNLogFactory）以覆盖ILogger创建。然后创建 ILogger 的基于实例的代理并插入您的自定义拦截器。最后通知LoggingFacility您要使用自定义工厂。

我开始对你的问题持悲观态度，但我发现解决方案实施起来非常简单，所以你不应该有太多问题来实现你想要的。代码？当然 ：）

public class MyFactory : NLogFactory
{
    public override ILogger Create(string name)
    {
        var il = base.Create(name);
        var pg =  new ProxyGenerator();
        return pg.CreateInterfaceProxyWithTarget<ILogger>(il, new LoggingInterceptor());
    }
}

public class LoggingInterceptor : IInterceptor
{
    public void Intercept(IInvocation invocation)
    {
        //Some modification to message here
        invocation.Proceed();
    }
}

internal class Program
{
    private static void Main(string[] args)
    {
        var container = new WindsorContainer();
        container.AddFacility<LoggingFacility>(f => f.UseNLog().LogUsing<MyFactory>());

        var logger = container.Resolve<ILogger>();
        logger.Debug("data"); // we intercept this call, success
        Console.ReadLine();
    }
}
于 2014-09-12T09:50:37.100 回答