/// <inheritdoc/>
public Task Subscribe <T>(BusEvent <T> eventMessage) where T : class
{
if (eventMessage == null)
{
throw new ArgumentNullException(nameof(eventMessage));
}
var @event = (eventMessage is PlatformEvent <T>) ?
eventMessage as PlatformEvent <T> :
throw new ArgumentException($"{nameof(eventMessage)} must be type of {nameof(PlatformEvent<T>)}");
if (!typeof(IMessageListener).IsAssignableFrom(typeof(T)))
{
throw new InvalidOperationException("Type parameter must be an IMessageListener");
}
var eventName = eventMessage.Name;
if (string.IsNullOrWhiteSpace(eventName))
{
throw new ArgumentException($"EventName of {nameof(eventMessage)} cannot be empty");
}
var key = new SubscriptionInfo(eventName, @event.ReplayId, typeof(T));
if (_subscriptions.ContainsKey(key))
{
// only allow a single subscription per (event + type)
throw new ArgumentException(
$"EventName of {nameof(eventMessage)} is already subscribed to {typeof(T).Name}.");
}
// check connection
if (!_streamingClient.IsConnected)
{
_streamingClient.Handshake();
}
// build channel segment
var topicName = GetEventOrTopicName(eventName);
var handler = GetListerner <T>();
_subscriptions.AddOrUpdate(key, handler, (existingKey, existingHandler) => existingHandler);
_streamingClient.SubscribeTopic(topicName, handler as IMessageListener, @event.ReplayId);
_logger.LogDebug($"{topicName} is subscribed with ReplayId: {@event.ReplayId}");
return(Task.CompletedTask);
}
/// <summary>
/// Initializes a new instance of the <see cref="EventBus"/> class.
/// </summary>
/// <param name="streamingClient">The instance of <see cref="IStreamingClient"/> with connection to salesforce.</param>
/// <param name="logger">The instance of <see cref="ILogger{SalesforceEventBus}"/>.</param>
/// <param name="forceClient">The instance of <see cref="ForceClientProxy"/> to provide a publish functionality to the bus.</param>
/// <param name="messageListeners"></param>
/// <param name="options"></param>
public EventBus(
IStreamingClient streamingClient,
ILogger <EventBus> logger,
IResilientForceClient forceClient,
IEnumerable <IMessageListener> messageListeners,
IOptions <SalesforceConfiguration> options)
{
_streamingClient = streamingClient ?? throw new ArgumentNullException(nameof(streamingClient));
_logger = logger ?? throw new ArgumentNullException(nameof(logger));
_forceClient = forceClient ?? throw new ArgumentNullException(nameof(forceClient));
_options = options.Value ?? throw new ArgumentNullException(nameof(options));
_messageListerners = messageListeners;
_streamingClient.Reconnect += StreamingClient_Reconnect;
_streamingClient.Handshake();
}