library/Rediska.php
public function getConnectionByKeyName($name)
    {
        if ($this->_specifiedConnection->getConnection()) {
            $connection = $this->_specifiedConnection->getConnection();
        } elseif (count($this->_connections) == 1) {
            $connections = array_values($this->_connections);
            $connection = $connections[0];
        } else {
            $alias = $this->_keyDistributor->getConnectionByKeyName($name);
            $connection = $this->_connections[$alias];
        }

        return $connection;
    }
public function getConnectionByKeyName($name)
    {
        if ($this->_specifiedConnection->getConnection()) {
            $connection = $this->_specifiedConnection->getConnection();
        } elseif (count($this->_connections) == 1) {
            $connections = array_values($this->_connections);
            $connection = $connections[0];
        } else {
            $alias = $this->_keyDistributor->getConnectionByKeyName($name);
            $connection = $this->_connections[$alias];
        }

        return $connection;
    }
Get Rediska connection instance by key name

@throws Rediska_Connection_Exception
@param string $name Key name
@return Rediska_Connection