public bool Flush()

in src/log4net/Repository/LoggerRepositorySkeleton.cs [478:529]
41 lines of code
10 McCabe index (conditional complexity)

  public bool Flush(int millisecondsTimeout)
  {
    if (millisecondsTimeout < -1)
    {
      throw new ArgumentOutOfRangeException(nameof(millisecondsTimeout),
        "Timeout must be -1 (Timeout.Infinite) or non-negative");
    }

    // Assume success until one of the appenders fails
    bool result = true;

    // Use DateTime.UtcNow rather than a System.Diagnostics.Stopwatch for compatibility with .NET 1.x
    DateTime startTimeUtc = DateTime.UtcNow;

    // Do buffering appenders first.  These may be forwarding to other appenders
    foreach (IAppender appender in GetAppenders())
    {
      if (appender is not IFlushable flushable)
      {
        continue;
      }

      if (appender is BufferingAppenderSkeleton)
      {
        int timeout = GetWaitTime(startTimeUtc, millisecondsTimeout);
        if (!flushable.Flush(timeout))
        {
          result = false;
        }
      }
    }

    // Do non-buffering appenders.
    foreach (IAppender appender in GetAppenders())
    {
      if (appender is not IFlushable flushable)
      {
        continue;
      }

      if (appender is not BufferingAppenderSkeleton)
      {
        int timeout = GetWaitTime(startTimeUtc, millisecondsTimeout);
        if (!flushable.Flush(timeout))
        {
          result = false;
        }
      }
    }

    return result;
  }