function set(key, value, cb) {
  if (!syncConfig.useCache || !redisClient) {
    return cb && cb();
  }
  return redisClient.set(key, value, cb);
}
function set(key, value, cb) {
  if (!syncConfig.useCache || !redisClient) {
    return cb && cb();
  }
  return redisClient.set(key, value, cb);
}
function set ( key , value , cb ) { if ( ! syncConfig . useCache || ! redisClient ) { return cb && cb ( ) ; } return redisClient . set ( key , value , cb ) ; }
Save data to the cache
@param {String} key
@param {String} value
@param {Function} cb
Save data to the cache