public override Stream AcquireLock()
{
if (_stream == null)
{
try
{
using (CurrentAppender.SecurityContext.Impersonate(this))
{
var directoryFullName = Path.GetDirectoryName(_filename);
if (directoryFullName != null && !Directory.Exists(directoryFullName))
{
Directory.CreateDirectory(directoryFullName);
}
if (_concurrentStream == null)
{
_concurrentStream = ConcurrentStream.GetInstance(_filename, _append, FileAccess.Write, FileShare.Read);
}
_stream = _concurrentStream;
_append = true;
}
}
catch (Exception e1)
{
CurrentAppender.ErrorHandler.Error("Unable to acquire lock on file " + _filename + ". " + e1.Message);
}
}
return _stream;
}
public static ConcurrentStream GetInstance(string path,
bool append,
FileAccess access,
FileShare share)
{
if (_instance != null) return _instance;
_instance = new ConcurrentStream(path, append, access, share);
return _instance;
}