public static Database getInstance()
{
    if( instance == null )
    {
        return instanceNotFoundDoubleCheckSynced();
    }
    return instance;
}


synchronized private static Database instanceNotFoundDoubleCheckSynced()
{
    if( instance == null )
    {
        Connection connection = establishConnection();
        if( connection != null )
        {
            instance = new Database( connection );
        }

    }