docs: @Override
  	public int size() {
  		Long longSize = 0L;
  		try {
  			longSize = new Long(redisManager.dbSize(keySerializer.serialize(this.keyPrefix + "*")));
  		} catch (SerializationException e) {
  			logger.error("get keys error", e);
  		}
  		return longSize.intValue();
  	}