/// <summary>
/// Determines whether the <see cref="ReceiverBase"/> instance can handle the given file name as log file.
/// </summary>
/// <returns><c>True</c> if the file can be handled, otherwise <c>false</c>.</returns>
public override bool CanHandleLogFile()
{
if (string.IsNullOrEmpty(mFileToObserve) || !File.Exists(mFileToObserve))
{
return(false);
}
using (StreamReader tmpReader = new StreamReader(mFileToObserve))
{
string firstLine = tmpReader.ReadLine();
return(LogMessageNLogSimple.TryParse(firstLine, 0, out _));
}
}
/// <summary>
/// Reads possible new log file entries form the file that is observed.
/// </summary>
private void ReadNewLogMessagesFromFile()
{
if (mFileReader == null || Equals(mFileReader.BaseStream.Length, mLastFileOffset))
{
return;
}
if (mLastFileOffset > mFileReader.BaseStream.Length)
{
// the current log file was re-created. Observe from beginning on.
mLastFileOffset = 0;
}
mFileReader.BaseStream.Seek(mLastFileOffset, SeekOrigin.Begin);
string line;
LogMessageNLogSimple newLogMsg = null;
FixedSizedQueue <LogMessage> messages = new FixedSizedQueue <LogMessage>(
Properties.Settings.Default.MaxLogMessages);
while ((line = mFileReader.ReadLine()) != null)
{
try
{
if (LogMessageNLogSimple.TryParse(line, mLogNumber, out LogMessageNLogSimple message))
{
newLogMsg = message;
messages.Enqueue(newLogMsg);
++mLogNumber;
}
else
{
newLogMsg?.AppendMessage(line);
}
}
catch (Exception ex)
{
Logger.Warn(ex.Message);
continue;
}
}
mLastFileOffset = mFileReader.BaseStream.Position;
mLogHandler?.HandleMessage(messages.ToArray());
}
