using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using WIDESEAWCS_Core.Helper; namespace WIDESEAWCS_Core.LogHelper { public class LogLock { static ReaderWriterLockSlim LogWriteLock = new ReaderWriterLockSlim(); static int WritedCount = 0; static int FailedCount = 0; static string _contentRoot = string.Empty; public LogLock(string contentPath) { _contentRoot = contentPath; } public static void OutLogAOP(string prefix, string[] dataParas, bool IsHeader = true) { OutSql2LogToFile(prefix, dataParas, IsHeader); } public static void OutSql2LogToFile(string prefix, string[] dataParas, bool IsHeader = true, bool isWrt = false) { try { //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 //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。 // 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 // 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 LogWriteLock.EnterWriteLock(); var folderPath = Path.Combine(_contentRoot, "Log"); if (!Directory.Exists(folderPath)) { Directory.CreateDirectory(folderPath); } //string logFilePath = Path.Combine(path, $@"{filename}.log"); var logFilePath = FileHelper.GetAvailableFileWithPrefixOrderSize(folderPath, prefix); var now = DateTime.Now; string logContent = String.Join("\r\n", dataParas); if (IsHeader) { logContent = ( "--------------------------------\r\n" + DateTime.Now + "|\r\n" + String.Join("\r\n", dataParas) + "\r\n" ); } else { logContent = ( dataParas[1] + ",\r\n" ); } //if (logContent.IsNotEmptyOrNull() && logContent.Length > 500) //{ // logContent = logContent.Substring(0, 500) + "\r\n"; //} if (isWrt) { System.IO.File.WriteAllText(logFilePath, logContent); } else { System.IO.File.AppendAllText(logFilePath, logContent); } WritedCount++; } catch (Exception e) { //Console.Write(e.Message); FailedCount++; } finally { //退出写入模式,释放资源占用 //注意:一次请求对应一次释放 // 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] // 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] LogWriteLock.ExitWriteLock(); } } } }