StatsD ServiceStack request timing Feature

gistfile1.cs

public class StatsDFeature : IPlugin
{
  private readonly Statsd _client;
  private readonly string _statNamePrefix;

  public StatsDFeature(IStatsd client, string statNamePrefix)
  {
   if (client == null)
    throw new ArgumentNullException("client", "client instance must be specified");

   if (statNamePrefix == null)
    throw new ArgumentNullException("statNamePrefix", "client instance must be specified");

   _client = (Statsd)client;
   _statNamePrefix = statNamePrefix;
  }

  public void Register(IAppHost appHost)
  {
   appHost.RequestFilters.Add(OnBeginRequest);
   appHost.ResponseFilters.Add(OnEndRequest);
  }


  private void OnBeginRequest(IHttpRequest request, IHttpResponse response, object model)
  {
   request.Items.Add("OnBeginRequest", DateTime.Now.Ticks);
  }

  private void OnEndRequest(IHttpRequest request, IHttpResponse response, object model)
  {
   var ticksNow = DateTime.Now.Ticks;
   string ticksBefore = request.Items["OnBeginRequest"].ToString();
   var ticks = ticksNow - long.Parse(ticksBefore);
   var span = new TimeSpan(ticks);

   _client.Send<Statsd.Timing>(_statNamePrefix + model.GetType().Name, span.Milliseconds);
  }
}