Asynchronous Logger using C# TPL

AsyncLogger.cs

using System;
using System.Collections.Concurrent;
using System.Threading.Tasks;

public interface ILogger
{
    void Log(string message);
}

class AsyncLogger : ILogger, IDisposable
{
    private readonly ILogger _actual;
    private readonly BlockingCollection<string> _queue;
    private readonly Task _loggingTask;

    public AsyncLogger(ILogger actual)
    {
        if (actual == null)
        {
            throw new ArgumentNullException("actual");
        }

        _actual = actual;
        _queue = new BlockingCollection<string>(new ConcurrentQueue<string>());
        _loggingTask = Task.Factory.StartNew(ConsumeQueueItem);
    }

    public void Log(string message)
    {
        _queue.Add(message);
    }

    private void ConsumeQueueItem()
    {
        foreach (string message in _queue.GetConsumingEnumerable())
        {
            _actual.Log(message);
        }
    }

    public void Dispose()
    {
        _queue.CompleteAdding();
        _loggingTask.Wait();
    }
}