code: public List<String> getTriggerGroupNames(T jedis){
          final Set<String> groupsSet = jedis.smembers(redisSchema.triggerGroupsSet());
          List<String> groups = new ArrayList<>(groupsSet.size());
          for (String group : groupsSet) {
              groups.add(redisSchema.triggerGroup(group));
          }
          return groups;
      }
docs: Get the names of all of the <code>{@link org.quartz.Trigger}</code> groups.
  @param jedis a thread-safe Redis connection
  @return the names of all trigger groups or an empty list if no trigger groups exist