/// <summary>
/// Subscribes the calling client to the item matching the provided FQN.
/// </summary>
/// <remarks>
/// Registers an event handler to the Changed event for the item, adds the client to the SignalR group for the item's
/// FQN, Subscribes the client to the item within the HubManager and calls the subscribeSuccess() method on the calling client.
/// </remarks>
/// <param name="arg">The Fully Qualified name of the Item to which to subscribe.</param>
public void Subscribe(object arg)
{
string castFQN = (string)arg;
// Item foundItem = manager.ProviderRegistry.FindItem(castFQN);
Item foundItem = manager.GetManager <IModelManager>().FindItem(castFQN);
if (foundItem != default(Item))
{
if (hubManager.GetClientSubscriptions(Context.ConnectionId).Contains(foundItem.FQN))
{
logger.Info(GetLogPrefix() + "is already subscribed to '" + foundItem.FQN + "'.");
}
else
{
foundItem.Changed += hubManager.OnChange;
Groups.Add(Context.ConnectionId, foundItem.FQN);
hubManager.Subscribe(foundItem.FQN, Context.ConnectionId);
Clients.Caller.subscribeSuccess(castFQN);
logger.Info(GetLogPrefix() + "subscribed to '" + foundItem.FQN + "'.");
logger.Info("SignalR Item '" + foundItem.FQN + "' now has " + hubManager.GetSubscriptions(foundItem.FQN).Count + " subscriber(s).");
// force a read event to populate the initial value client side
InvokeRead(foundItem);
}
}
else
{
Clients.Caller.subscribeError(castFQN);
logger.Info("Unable to subscribe to '" + castFQN + "'; the Item can't be found.");
}
}
/// <summary>
/// Subscribes the calling client to the logger.
/// </summary>
/// <remarks>
/// Registers an event handler to the Changed event for the item, adds the client to the SignalR group for the item's
/// FQN, Subscribes the client to the item within the HubManager and calls the subscribeSuccess() method on the calling client.
/// </remarks>
/// <param name="arg">The Fully Qualified name of the Item to which to subscribe.</param>
public void Subscribe(object arg)
{
Groups.Add(Context.ConnectionId, "Logger");
hubManager.Subscribe("Logger", Context.ConnectionId);
Clients.Caller.subscribeSuccess("Logger");
logger.Info(GetLogPrefix() + "subscribed to the Logger.");
logger.Info("SignalR Logger now has " + hubManager.GetSubscriptions("Logger").Count + " subscriber(s).");
}