wikimedia / mediawiki

		return $result;

	}

	public function set( $key, $value, $exptime = 0, $flags = 0 ) {

		$ok = $this->setMulti( [ $key => $value ], $exptime );

		if ( ( $flags & self::WRITE_SYNC ) == self::WRITE_SYNC ) {

			$ok = $this->waitForReplication() && $ok;

		}

		return $ok;

	}

	protected function cas( $casToken, $key, $value, $exptime = 0 ) {

		list( $serverIndex, $tableName ) = $this->getTableByKey( $key );

		return $newValue;

	}

	public function merge( $key, callable $callback, $exptime = 0, $attempts = 10, $flags = 0 ) {

		$ok = $this->mergeViaCas( $key, $callback, $exptime, $attempts );

		if ( ( $flags & self::WRITE_SYNC ) == self::WRITE_SYNC ) {

			$ok = $this->waitForReplication() && $ok;

		}

		return $ok;

	}

	public function changeTTL( $key, $expiry = 0 ) {

		list( $serverIndex, $tableName ) = $this->getTableByKey( $key );