public Subscription(string identity, IEnumerable<string> eventKeys, Func<MessageResult, Task<bool>> callback, int maxMessages, IPerformanceCounterWriter counters)
{
Identity = identity;
_callback = callback;
_maxMessages = maxMessages;
EventKeys = eventKeys;
MaxMessages = maxMessages;
_subsTotalCounter = counters.GetCounter(PerformanceCounters.MessageBusSubscribersTotal);
_subsCurrentCounter = counters.GetCounter(PerformanceCounters.MessageBusSubscribersCurrent);
_subsPerSecCounter = counters.GetCounter(PerformanceCounters.MessageBusSubscribersPerSec);
_subsTotalCounter.SafeIncrement();
_subsCurrentCounter.SafeIncrement();
_subsPerSecCounter.SafeIncrement();
}