protected void handleInterestEvent(InterestRegistrationEvent event) {
    InternalRegion region = (InternalRegion) event.getRegion();
    region.handleInterestEvent(event);
  }
Returns this {@code CacheClientNotifier}'s message time-to-live.

@return this {@code CacheClientNotifier}'s message time-to-live
geode-core/src/main/java/org/apache/geode/internal/cache/tier/sockets/CacheClientNotifier.java