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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace Tango.Logging
{
/// <summary>
/// Represents a helper class for logging information and errors.
/// </summary>
public static class LogManager
{
private static List<ILogger> _loggers;
private static ConcurrentQueue<LogItemBase> _logs;
private static Thread _loggingThread;
private static bool _isStarted;
/// <summary>
/// Gets or sets a value indicating whether to propagate logs instantly (Warning - not thread safe).
/// </summary>
public static bool OverrideQueue { get; set; }
/// <summary>
/// Initializes the <see cref="LogManager"/> class.
/// </summary>
static LogManager()
{
_loggers = new List<ILogger>();
_logs = new ConcurrentQueue<LogItemBase>();
Categories = new List<LogCategory>();
Categories.Add(LogCategory.Critical);
Categories.Add(LogCategory.Debug);
Categories.Add(LogCategory.Error);
Categories.Add(LogCategory.General);
Categories.Add(LogCategory.Warning);
}
/// <summary>
/// Gets or sets the logging categories filter.
/// </summary>
public static List<LogCategory> Categories { get; private set; }
/// <summary>
/// Registers a logger.
/// </summary>
/// <param name="logger">The logger.</param>
public static void RegisterLogger(ILogger logger)
{
if (logger != null && !_loggers.Contains(logger))
{
_loggers.Add(logger);
}
}
/// <summary>
/// Unregisters a logger.
/// </summary>
/// <param name="logger">The logger.</param>
public static void UnregisterLogger(ILogger logger)
{
if (logger != null && _loggers.Contains(logger))
{
_loggers.Remove(logger);
}
}
/// <summary>
/// Add new exception log item.
/// </summary>
/// <param name="e">Exception.</param>
/// <param name="description">Error description.</param>
public static Exception Log(Exception e, String description = null, [CallerMemberName] string caller = null, [CallerFilePath] string file = null, [CallerLineNumber] int lineNumber = 0)
{
return Log(e, LogCategory.Error, description, caller, file, lineNumber);
}
/// <summary>
/// Add new exception log item.
/// </summary>
/// <param name="e">Exception.</param>
/// <param name="description">Error description.</param>
public static Exception Log(Exception e, LogCategory category, String description = null, [CallerMemberName] string caller = null, [CallerFilePath] string file = null, [CallerLineNumber] int lineNumber = 0)
{
if (!Categories.Contains(category)) return e;
ExceptionLogItem log = new ExceptionLogItem();
log.CallerMethodName = caller;
log.CallerFile = file;
log.CallerLineNumber = lineNumber;
log.TimeStamp = DateTime.Now;
log.Exception = e;
log.Category = category;
log.Description = description != null ? description : e.ToString();
if (!OverrideQueue)
{
AppendLog(log);
}
else
{
AppendLogInstantly(log);
}
return e;
}
/// <summary>
/// Add new message log item.
/// </summary>
/// <param name="message">Message.</param>
public static String Log(String message, [CallerMemberName] string caller = null, [CallerFilePath] string file = null, [CallerLineNumber] int lineNumber = 0)
{
return Log(message, LogCategory.General, caller, file, lineNumber);
}
/// <summary>
/// Add new message log item.
/// </summary>
/// <param name="message">Message.</param>
public static String Log(String message, LogCategory category, [CallerMemberName] string caller = null, [CallerFilePath] string file = null, [CallerLineNumber] int lineNumber = 0)
{
if (!Categories.Contains(category)) return message;
MessageLogItem log = new MessageLogItem();
log.CallerMethodName = caller;
log.CallerFile = file;
log.CallerLineNumber = lineNumber;
log.TimeStamp = DateTime.Now;
log.Category = category;
log.Message = message;
if (!OverrideQueue)
{
AppendLog(log);
}
else
{
AppendLogInstantly(log);
}
return message;
}
/// <summary>
/// Appends the log.
/// </summary>
/// <param name="log">The log.</param>
private static void AppendLog(LogItemBase log)
{
if (log != null)
{
_loggers.Where(x => x.Enabled && x.Immediate).ToList().ForEach(x => x.OnLog(log));
}
_logs.Enqueue(log);
StartLoggingThread();
}
/// <summary>
/// Starts the logging thread.
/// </summary>
private static void StartLoggingThread()
{
if (!_isStarted)
{
_isStarted = true;
_loggingThread = new Thread(LoggingThreadMethod);
_loggingThread.IsBackground = true;
_loggingThread.Start();
}
}
/// <summary>
/// Loggings thread method.
/// </summary>
//[DebuggerStepThrough]
//[DebuggerHidden]
private static void LoggingThreadMethod()
{
while (_isStarted)
{
while (_logs.Count > 0)
{
LogItemBase log;
if (_logs.TryDequeue(out log))
{
if (log != null)
{
_loggers.Where(x => x.Enabled && !x.Immediate).ToList().ForEach(x => x.OnLog(log));
}
}
}
Thread.Sleep(10);
}
}
/// <summary>
/// Appends the log instantly.
/// </summary>
/// <param name="log">The log.</param>
[DebuggerStepThrough]
[DebuggerHidden]
private static void AppendLogInstantly(LogItemBase log)
{
bool wroteLog = false;
while (!wroteLog)
{
try
{
_loggers.Where(x => x.Enabled).ToList().ForEach(x => x.OnLog(log));
wroteLog = true;
}
catch
{
Thread.Sleep(5);
}
}
}
}
}
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