/// <summary>
/// Cleanup OS handles for <see cref="_fileStreamReader"/> and <see cref="FileObserver"/>.
/// </summary>
protected override void PostStop()
{
_observer.Dispose();
_observer = null;
_fileStreamReader.Close();
_fileStreamReader.Dispose();
base.PostStop();
}
/// <summary>
/// Initialization logic for actor that will tail changes to a file.
/// </summary>
protected override void PreStart()
{
// start watching file for changes
_observer = new FileObserver(Self, Path.GetFullPath(_filePath));
_observer.Start();
// open the file stream with shared read/write permissions (so file can be written to while open)
_fileStream = new FileStream(Path.GetFullPath(_filePath), FileMode.Open, FileAccess.Read,
FileShare.ReadWrite);
_fileStreamReader = new StreamReader(_fileStream, Encoding.UTF8);
// read the initial contents of the file and send it to console as first message
var text = _fileStreamReader.ReadToEnd();
Self.Tell(new InitialRead(_filePath, text));
}