/// <summary>
/// Subscribes to a topic which may or may not be missing.
/// </summary>
/// <param name="topicPath">The path of the topic to subscribe to.</param>
public async void Subscribe(string topicPath)
{
var missingTopicHandler = new MissingTopicHandler();
// Add the 'missing topic handler' to the topic control object
topicControl.AddMissingTopicHandler(topicPath, missingTopicHandler);
// Wait for the successful registration of the handler
var registeredHandler = await missingTopicHandler.OnActiveCalled;
var topics = clientSession.GetTopicsFeature();
var topicCompletion = new TaskCompletionSource <bool>();
// Attempt to subscribe to the topic
topics.Subscribe(topicPath, new TopicsCompletionCallback(topicCompletion));
await topicCompletion.Task;
// Wait and see if a missing topic notification is generated
var request = await missingTopicHandler.OnMissingTopicCalled;
// Cancel the client request on the server
request.Cancel();
// Close the registered handler
registeredHandler.Close();
// All events in Diffusion are asynchronous, so we must wait for the close to happen
await missingTopicHandler.OnCloseCalled;
}
/// <summary>
/// Subscribes to a topic which may or may not be missing.
/// </summary>
/// <param name="topicPath">The path of the topic to subscribe to.</param>
public async void Subscribe( string topicPath ) {
var missingTopicHandler = new MissingTopicHandler();
// Add the 'missing topic handler' to the topic control object
topicControl.AddMissingTopicHandler( topicPath, missingTopicHandler );
// Wait for the successful registration of the handler
var registeredHandler = await missingTopicHandler.OnActiveCalled;
var topics = clientSession.GetTopicsFeature();
var topicCompletion = new TaskCompletionSource<bool>();
// Attempt to subscribe to the topic
topics.Subscribe( topicPath, new TopicsCompletionCallback( topicCompletion ) );
await topicCompletion.Task;
// Wait and see if a missing topic notification is generated
var request = await missingTopicHandler.OnMissingTopicCalled;
// Cancel the client request on the server
request.Cancel();
// Close the registered handler
registeredHandler.Close();
// All events in Diffusion are asynchronous, so we must wait for the close to happen
await missingTopicHandler.OnCloseCalled;
}