记录和同步

Question

我刚刚编写了自己的日志框架(非常轻量级,不需要大型日志框架).它由一个接口ILogger和许多实现该接口的类组成.我有一个问题是TGUILogger,它将TStrings作为日志记录目标,并将日志记录与主线程同步,以便列表框的Items成员可以用作目标.

type
  ILogger = Interface (IInterface)
    procedure Log (const LogString : String; LogLevel : TLogLevel);
    procedure SetLoggingLevel (LogLevel : TLogLevel);
  end;

type    
  TGUILogger = class (TInterfacedObject, ILogger)
  public
    constructor Create (Target : TStrings);
    procedure Log (const LogString : String; LogLevel : TLogLevel);
    procedure SetLoggingLevel (LogLevel : TLogLevel);
  private
    procedure PerformLogging;
  end;

procedure TGUILogger.Log (const LogString : String; LogLevel : TLogLevel);
begin
  TMonitor.Enter (Self);
  try
    FLogString := GetDateTimeString + ' ' + LogString;
    TThread.Synchronize (TThread.CurrentThread, PerformLogging);
  finally
    TMonitor.Exit (Self);
  end;
end;

procedure TGUILogger.PerformLogging;
begin
  FTarget.Add (FLogString);
end;

日志记录有效,但应用程序未正确关闭.它似乎挂在Classes单元中.堆栈跟踪:

System.Halt0,System.FinalizeUnits,Classes.Finalization,Classes.FreeExternalThreads,System.TObject.Free,Classes.TThread.Destroy,Classes.TThread.RemoveQueuedEvents

我在这做错了什么？

编辑:我刚刚在Delphi帮助TThread.StaticSynchronize中找到以下提示

Warning: Do not call StaticSynchronize from within the main thread. This can cause 
an infinite loop.     

这可能是我的问题,因为一些日志记录请求来自主线程.我怎么解决这个问题？

Answer 1

如果将CurrentThreadID与MainThreadID进行比较,则可以选择是否同步.

就个人而言,我选择让GUI向日志系统询问最新信息,而不是让线程暂停.否则,您的日志记录会干扰线程的快速操作,从而无法实现此操作.