private async Task RefreshStateAsync(string id, CancellationToken cancellationToken)
{
try
{
// Only allow one concurrent call to the access control system (VMS will likely request status for all doors on startup)
await _resolveStateSemaphore.WaitAsync(cancellationToken);
try
{
// Check if status was already updated
var state = GetState(id);
if (state == null)
{
try
{
var doorStatus = await _client.GetDoorStatusAsync(id);
cancellationToken.ThrowIfCancellationRequested();
if (doorStatus != null)
{
state = TypeConverter.ToACState(doorStatus);
UpdateState(state);
FireStatesChanged(new[] { state });
}
}
catch (DemoApplicationClientException ex)
{
// Should probably retry on failure
ACUtil.Log(true, "DemoACPlugin.StateManager", "Error refreshing state for door " + id + ": " + ex.Message);
}
}
}
finally
{
_resolveStateSemaphore.Release();
}
}
catch (OperationCanceledException)
{ }
}