Aquí hay una muestra de un Log implementado con el patrón Producer/Consumer (con .Net 4) usando un BlockingCollection. La interfaz es:
namespace Log
{
public interface ILogger
{
void WriteLine(string msg);
void WriteError(string errorMsg);
void WriteError(string errorObject, string errorAction, string errorMsg);
void WriteWarning(string errorObject, string errorAction, string errorMsg);
}
}
y el código de clase completo está aquí:
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Log
{
// Reentrant Logger written with Producer/Consumer pattern.
// It creates a thread that receives write commands through a Queue (a BlockingCollection).
// The user of this log has just to call Logger.WriteLine() and the log is transparently written asynchronously.
public class Logger : ILogger
{
BlockingCollection<Param> bc = new BlockingCollection<Param>();
// Constructor create the thread that wait for work on .GetConsumingEnumerable()
public Logger()
{
Task.Factory.StartNew(() =>
{
foreach (Param p in bc.GetConsumingEnumerable())
{
switch (p.Ltype)
{
case Log.Param.LogType.Info:
const string LINE_MSG = "[{0}] {1}";
Console.WriteLine(String.Format(LINE_MSG, LogTimeStamp(), p.Msg));
break;
case Log.Param.LogType.Warning:
const string WARNING_MSG = "[{3}] * Warning {0} (Action {1} on {2})";
Console.WriteLine(String.Format(WARNING_MSG, p.Msg, p.Action, p.Obj, LogTimeStamp()));
break;
case Log.Param.LogType.Error:
const string ERROR_MSG = "[{3}] *** Error {0} (Action {1} on {2})";
Console.WriteLine(String.Format(ERROR_MSG, p.Msg, p.Action, p.Obj, LogTimeStamp()));
break;
case Log.Param.LogType.SimpleError:
const string ERROR_MSG_SIMPLE = "[{0}] *** Error {1}";
Console.WriteLine(String.Format(ERROR_MSG_SIMPLE, LogTimeStamp(), p.Msg));
break;
default:
Console.WriteLine(String.Format(LINE_MSG, LogTimeStamp(), p.Msg));
break;
}
}
});
}
~Logger()
{
// Free the writing thread
bc.CompleteAdding();
}
// Just call this method to log something (it will return quickly because it just queue the work with bc.Add(p))
public void WriteLine(string msg)
{
Param p = new Param(Log.Param.LogType.Info, msg);
bc.Add(p);
}
public void WriteError(string errorMsg)
{
Param p = new Param(Log.Param.LogType.SimpleError, errorMsg);
bc.Add(p);
}
public void WriteError(string errorObject, string errorAction, string errorMsg)
{
Param p = new Param(Log.Param.LogType.Error, errorMsg, errorAction, errorObject);
bc.Add(p);
}
public void WriteWarning(string errorObject, string errorAction, string errorMsg)
{
Param p = new Param(Log.Param.LogType.Warning, errorMsg, errorAction, errorObject);
bc.Add(p);
}
string LogTimeStamp()
{
DateTime now = DateTime.Now;
return now.ToShortTimeString();
}
}
}
En esta muestra, la clase Param interno utilizado para pasar información a la rosca de escritura a través de la BlockingCollection es:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Log
{
internal class Param
{
internal enum LogType { Info, Warning, Error, SimpleError };
internal LogType Ltype { get; set; } // Type of log
internal string Msg { get; set; } // Message
internal string Action { get; set; } // Action when error or warning occurs (optional)
internal string Obj { get; set; } // Object that was processed whend error or warning occurs (optional)
internal Param()
{
Ltype = LogType.Info;
Msg = "";
}
internal Param(LogType logType, string logMsg)
{
Ltype = logType;
Msg = logMsg;
}
internal Param(LogType logType, string logMsg, string logAction, string logObj)
{
Ltype = logType;
Msg = logMsg;
Action = logAction;
Obj = logObj;
}
}
}
En lugar de escribir su propia implementación de registro, asegúrese de haber echado un vistazo a [log4net] (http://logging.apache.org/log4net/index.html) et al. Si esta es una aplicación solo para Windows y el rendimiento en paralelo es una preocupación, también considere [NTrace] (http://ntrace.codeplex.com/). – hemp