code: public Map<BsonValue, ChangeEvent<BsonDocument>> getEventsForNamespace(
        final MongoNamespace namespace
    ) {
      this.instanceLock.readLock().lock();
      final NamespaceChangeStreamListener streamer;
      try {
        streamer = nsStreamers.get(namespace);
      } finally {
        this.instanceLock.readLock().unlock();
      }
      if (streamer == null) {
        return new HashMap<>();
      }
      return streamer.getEvents();
    }
docs: Returns the latest change events for a given namespace.
  
  @param namespace the namespace to get events for.
  @return the latest change events for a given namespace.