/// <summary>
/// This is a helper mehtod that connects the Scribbler on the specified
/// COM port. It waits for the connection to complete, and re-throws any
/// exceptions generated by the Scribbler service.
/// </summary>
/// <param name="comPort"></param>
private static void connectWaitForScribbler(string comPort)
{
ManualResetEvent evt = new ManualResetEvent(false);
waitForService(new ServiceInfoType(scribbler.Contract.Identifier),
delegate(ServiceInfoType info) { brickService = info; evt.Set(); });
evt.WaitOne(Params.DefaultRecieveTimeout, false);
if (brickService == null)
{
throw new MyroInitException("Could not find Scribbler service");
}
var scribPort = DssEnvironment.ServiceForwarder <scribbler.ScribblerOperations>(new Uri(brickService.Service));
DispatcherQueue queue = new DispatcherQueue("init", new Dispatcher());
try
{
if (comPort != null)
{
int comNumber;
if (comPort.ToLower().StartsWith("com"))
{
comNumber = Int32.Parse(comPort.Substring(3));
}
else
{
throw new MyroInitException("COM port string must be of the format com2, com5, etc.");
}
RSUtils.ReceiveSync(queue, scribPort.Replace(new scribbler.ScribblerState()
{
ComPort = comNumber
}), Params.DefaultRecieveTimeout);
}
DssEnvironment.LogInfo("calling reconnect...");
RSUtils.ReceiveSync(queue, scribPort.Reconnect(), Params.DefaultRecieveTimeout);
DssEnvironment.LogInfo("reconnect returned");
}
catch (Exception)
{
throw;
}
finally
{
queue.Dispose();
}
}
/// <summary>
/// Helper method that waits for a service to start and runs a handler when it does.
/// This subscribes to and queries the DSS directory.
/// </summary>
/// <param name="serviceInfo"></param>
/// <param name="handler"></param>
private static void waitForService(ServiceInfoType serviceInfo, Handler <ServiceInfoType> handler)
{
var dirPort = DssEnvironment.ServiceForwarder <directory.DirectoryPort>(new Uri("dssp.tcp://localhost/directory"));
var notPort = new directory.DirectoryPort();
// Keep this flag to only run the handler once
bool ranHandler = false;
Object lockObj = new Object();
// Subscribe first, then query, to make sure we don't miss the service registering itself
DssEnvironment.LogInfo("Subscribing to directory");
Arbiter.Activate(DssEnvironment.TaskQueue, Arbiter.Choice(
dirPort.Subscribe(
new directory.SubscribeRequest()
{
QueryRecordList = new List <ServiceInfoType>()
{
serviceInfo
},
NotificationCount = 1
},
notPort,
typeof(directory.Insert)),
delegate(SubscribeResponseType r)
{
DssEnvironment.LogInfo("Subscribed to directory!");
// Run handler if the service starts and we get the subscription notification
DssEnvironment.LogInfo("Activating subscription receive");
Arbiter.Activate(DssEnvironment.TaskQueue, Arbiter.Receive <directory.Insert>(false, notPort,
delegate(directory.Insert ins)
{
DssEnvironment.LogInfo("Got subscription notification!");
lock (lockObj)
{
if (ranHandler == false)
{
new Thread(new ThreadStart(delegate() { handler.Invoke(ins.Body.Record); })).Start();
ranHandler = true;
}
}
}));
},
delegate(Fault f)
{
lock (lockObj)
{
if (ranHandler == false)
{
new Thread(new ThreadStart(delegate() { handler.Invoke(null); })).Start();
ranHandler = true;
}
}
DssEnvironment.LogError("Fault received while subscribing to directory: " + Strings.FromFault(f));
}));
// Query directory, run handler if the service is already started
DssEnvironment.LogInfo("Querying directory");
Arbiter.Activate(DssEnvironment.TaskQueue, Arbiter.Choice(
dirPort.Query(new directory.QueryRequest()
{
QueryRecord = serviceInfo
}),
delegate(directory.QueryResponse r)
{
DssEnvironment.LogInfo("Queried directory!");
lock (lockObj)
{
if (ranHandler == false && r.RecordList.Length > 0)
{
new Thread(new ThreadStart(delegate() { handler.Invoke(r.RecordList[0]); })).Start();
ranHandler = true;
}
}
},
delegate(Fault f)
{
//lock (lockObj)
//{
// if (ranHandler == false)
// {
// new Thread(new ThreadStart(delegate() { handler.Invoke(null); })).Start();
// ranHandler = true;
// }
//}
DssEnvironment.LogError("Fault received while querying directory: " + Strings.FromFault(f));
}));
}
