/// <summary>
/// Entry-point to register a reactive subscription
/// </summary>
/// <remarks>
/// You should specify only one handler: either sync or async.
/// </remarks>
/// <param name="subject">The subject to subscribe to.</param>
/// <param name="queue">The queue group name. Specify null or empty if not used.</param>
/// <param name="syncHandler">The sync callback to handle the messages.</param>
/// <param name="asyncHandler">The async callback to handle the messages.</param>
/// <returns>An instance of <see cref="ReactiveSubscription"/>.</returns>
internal IReactiveSubscription SubscribeReactive(
string subject,
string queue,
Action <MsgOut, CancellationToken> syncHandler,
Func <MsgOut, CancellationToken, Task> asyncHandler
)
{
if (string.IsNullOrWhiteSpace(subject))
{
throw new NATSBadSubscriptionException();
}
lock (this._sublocker)
{
//creates a new instance of subscription proxy
this._ssid++;
var sub = new ReactiveSubscription(
this,
this._ssid,
subject,
queue,
syncHandler,
asyncHandler
);
//then register it
this._subRegister.Add(this._ssid, sub);
//finally, enqueues the request of subscription to be
//sent to the NATS broker.
this._connmgr.EnqueueSubscriptionOperation(sub.ProtoMessageSub);
return(sub);
}
}
/// <summary>
/// Signals the local dispatcher about new messages related
/// to the specified subscription
/// </summary>
/// <param name="sub"></param>
internal void ReactiveSubscriptionSignal(ReactiveSubscription sub)
{
if (sub.AnyPending == false)
{
lock (this._reactProcessorLocker)
{
this._reactPendingQueue.AddLast(sub);
sub.AnyPending = true;
}
this._reactSemaphore.Release(1);
}
}
