private readonly object deviceListLockObject = new object(); // Lock object to synchronise access to the Alpaca device list collection, which is not a thread safe collection
#region New and IDisposable Support
/// <summary>
/// Initialiser that takes a trace logger
/// </summary>
/// <param name="tl">Trace logger instance to use for activity logging</param>
internal AlpacaDiscovery(ITraceLoggerUtility tl)
{
try
{
// Save the supplied trace logger object
TL = tl;
// Initialise variables
tryDnsNameResolution = false; // Initialise so that there is no host name resolution by default
DiscoveryComplete = true; // Initialise so that discoveries can be run
// Initialise utility objects
discoveryCompleteTimer = new System.Threading.Timer(OnDiscoveryCompleteTimer);
if (finder != null)
{
finder.Dispose();
finder = null;
}
finder = new Finder(BroadcastResponseEventHandler, TL); // Get a new broadcast response finder
LogMessage("AlpacaDiscoveryInitialise", $"Complete - Running on thread {Thread.CurrentThread.ManagedThreadId}");
}
catch (Exception ex)
{
LogMessage("AlpacaDiscoveryInitialise", $"Exception{ex.ToString()}");
}
}
/// <summary>
/// Creates a Alpaca Finder object that sends out a search request for Alpaca devices
/// The results will be sent to the callback and stored in the cache
/// Calling search and concatenating the results reduces the chance that a UDP packet is lost
/// This may require firewall access
/// </summary>
/// <param name="callback">A callback function to receive the endpoint result</param>
internal Finder(Action <IPEndPoint, AlpacaDiscoveryResponse> callback, ITraceLoggerUtility traceLogger)
{
TL = traceLogger; // Save the trace logger object
LogMessage("Finder", "Starting Initialisation...");
callbackFunctionDelegate = callback;
udpClient = new UdpClient();
udpClient.EnableBroadcast = true;
udpClient.MulticastLoopback = false;
//0 tells OS to give us a free ethereal port
udpClient.Client.Bind(new IPEndPoint(IPAddress.Any, 0));
udpClient.BeginReceive(FinderDiscoveryCallback, udpClient);
LogMessage("Finder", "Initialised");
}
