101 lines
3.5 KiB
C#
101 lines
3.5 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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namespace MetroGauges
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{
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public sealed class LogManager
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{
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private static string logPath = string.Empty;
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private static object locker = new object();
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//读写锁，当资源处于写入模式时，其他线程写入需要等待本次写入结束之后才能继续写入
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private static ReaderWriterLockSlim LogWriteLock = new ReaderWriterLockSlim();
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/// <summary>
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/// 保存日志的文件夹
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/// </summary>
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public static string LogPath
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{
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get
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{
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if (logPath == string.Empty)
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{
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logPath = AppDomain.CurrentDomain.BaseDirectory + @"logs\";
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}
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return logPath;
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}
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set { logPath = value; }
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}
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private static string logFielPrefix = string.Empty;
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/// <summary>
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/// 日志文件前缀
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/// </summary>
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public static string LogFielPrefix
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{
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get { return logFielPrefix; }
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set { logFielPrefix = value; }
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}
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/// <summary>
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/// 写日志
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/// </summary>
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public static void WriteLog(string logFile, string msg)
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{
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try
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{
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//设置读写锁为写入模式独占资源，其他写入请求需要等待本次写入结束之后才能继续写入
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//注意：长时间持有读线程锁或写线程锁会使其他线程发生饥饿 (starve)。 为了得到最好的性能，需要考虑重新构造应用程序以将写访问的持续时间减少到最小。
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// 从性能方面考虑，请求进入写入模式应该紧跟文件操作之前，在此处进入写入模式仅是为了降低代码复杂度
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// 因进入与退出写入模式应在同一个try finally语句块内，所以在请求进入写入模式之前不能触发异常，否则释放次数大于请求次数将会触发异常
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LogWriteLock.EnterWriteLock();
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if (!Directory.Exists(LogPath))
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{
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Directory.CreateDirectory(LogPath);
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}
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string path = LogPath + LogFielPrefix + logFile + "_" + DateTime.Now.ToString("yyyyMMdd") + ".Log";
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System.IO.StreamWriter sw = System.IO.File.AppendText(path);
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sw.WriteLine(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss: ") + msg);
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sw.Close();
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}
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catch
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{
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}
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finally {
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//退出写入模式，释放资源占用
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//注意：一次请求对应一次释放
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// 若释放次数大于请求次数将会触发异常[写入锁定未经保持即被释放]
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// 若请求处理完成后未释放将会触发异常[此模式不下允许以递归方式获取写入锁定]
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LogWriteLock.ExitWriteLock();
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}
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}
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/// <summary>
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/// 写日志
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/// </summary>
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public static void WriteLog(LogFile logFile, string msg)
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{
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WriteLog(logFile.ToString(), msg);
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}
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}
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/// <summary>
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/// 日志类型
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/// </summary>
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public enum LogFile
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{
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Trace,
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Warning,
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Error,
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SQL
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}
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}
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