/// <summary>
/// Initializes this object's state and sets up BetaInnovations SDK objects
/// to monitor the BetaInnoviations device instance that this object
/// is responsible for.
/// During preparation, the _preparing flag is raised. Subsequent concurrent calls to
/// Prepare() will simply wait until the _preparing flag is lowered.
/// </summary>
protected override void Prepare()
{
var elapsed = 0;
const int timeout = 500;
while (_preparing && elapsed <= timeout)
{
Thread.Sleep(20);
elapsed += 20;
}
if (!_preparing)
{
try
{
_manager = BIDeviceManager.GetInstance();
try
{
_preparing = true;
//check if device is attached
var connected = _manager.IsDeviceAttached(Device.Key.ToString(), false);
if (!connected)
{
_preparing = false;
_prepared = false;
return;
}
}
catch (BIException e)
{
_log.Error(e.Message, e);
_preparing = false;
_prepared = false;
return;
}
_prepared = true;
}
catch (BIException ex)
{
_log.Error(ex.Message, ex);
_prepared = false;
throw;
}
finally
{
_preparing = false;
}
}
}
/// <summary>
/// Discovers the physical controls that appear on this device,
/// as reported by the BetaInnovations SDK, and stores them as an array
/// of PhysicalControlInfo objects at the instance level.
/// NOT guaranteed to be successful -- if the calls to
/// the BetaInnovations SDK fail or if the device
/// is not currently registered, then the controls list will remain
/// unpopulated.
/// </summary>
protected override void LoadControls()
{
if (_controlsLoaded)
{
return;
}
var manager = BIDeviceManager.GetInstance();
if (!manager.IsDeviceAttached(_key.ToString(), false))
{
return;
}
_controls = manager.GetControlsOnDevice(this, false);
_controlsLoaded = true;
}
/// <summary>
/// Private implementation of Dispose()
/// </summary>
/// <param name="disposing">
/// flag to indicate if we should actually perform disposal. Distinguishes the private method
/// signature from the public signature.
/// </param>
private void Dispose(bool disposing)
{
if (!_isDisposed)
{
if (disposing)
{
_instance = null;
}
}
// Code to dispose the un-managed resources of the class
if (_devicesOpen)
{
CloseDevices(false);
}
_isDisposed = true;
}
public static BIDeviceManager GetInstance()
{
return(_instance ?? (_instance = new BIDeviceManager()));
}