public IAsyncResult BeginPoll(string device, string operation, AsyncCallback callback, object state)
{
var pollCompletionSource = new PollCompletionSource(device, operation, callback, state);
NotificationListener.Create().Register(device, operation, pollCompletionSource);
return(pollCompletionSource.Task);
}
public void Dispose()
{
try
{
_disposing.EnterWriteLock();
if (!_disposed)
{
try
{
_cancellationSource.Cancel();
_worker.Wait();
}
catch
{
}
finally
{
_cancellationSource.Dispose();
_worker = null;
_cancellationSource = null;
_devices = null;
_disposed = true;
_listener = null;
}
}
}
finally
{
_disposing.ExitWriteLock();
}
}
public static NotificationListener Create()
{
if (_listener == null)
{
lock (_sync)
{
if (_listener == null)
{
_listener = new NotificationListener();
}
}
}
return(_listener);
}
public void UnregisterAll()
{
NotificationListener.Create().Dispose();
}
