docs: @Override
      public long getProcessedCount() {
          return PoolUtils.doWorkInPoolNicely(this.jedisPool, new PoolWork<Jedis, Long>() {
              /**
               * {@inheritDoc}
               */
              @Override
              public Long doWork(final Jedis jedis) throws Exception {
                  final String processedStr = jedis.get(key(STAT, PROCESSED));
                  return (processedStr == null) ? 0L : Long.parseLong(processedStr);
              }
          });
      }