function __construct(array $config)
    {
        parent::__construct($config, 'route');
        $this->signer = new BceV1Signer();
        $this->httpClient = new BceHttpClient();
    }

public function getRouteTable( $vpcId = null, $routeTableId = null, $options = array()) {
    list($config) = $this->parseOptions($options, 'config');
    $params = array();
    if (empty($routeTableId)  && empty($vpcId )) {
        throw new \InvalidArgumentException(
            'request $routeTableId and $vpcId should not be empty at the same time.'
        );
    }
    if (!empty($routeTableId)) {
        $params['routeTableId'] = $routeTableId;
    }
    if (!empty($vpcId)) {
        $params['vpcId'] = $vpcId;
    }
    return $this->sendRequest(
        HttpMethod::GET,
        array(
            'config' => $config,
            'params' => $params,
        ),
        '/route'
    );
}

public function createRouteRule($routeTableId,  $sourceAddress, $destinationAddress,
    $nexthopType, $description, $nexthopId = null, $clientToken = null, $options = array()) {
    list($config) = $this->parseOptions($options, 'config');
    $params = array();
    $body = array();
    // 校验是否设置 clientToken 
    if (empty($clientToken)) {
        $params['clientToken'] = $this->generateClientToken();
    }
    else {
        $params['clientToken'] = $clientToken;
    }
    // 校验 routeTableId 是否为空
    if (empty($routeTableId)) {
        throw new \InvalidArgumentException(
            'request $routeTableId  should not be empty .'
        );
    }
    // 校验 sourceAddress 是否为空
    if (empty($sourceAddress)) {
        throw new \InvalidArgumentException(
            'request $sourceAddress  should not be empty .'
        );
    }
    // 校验 destinationAddress 是否为空
    if (empty($destinationAddress)) {
        throw new \InvalidArgumentException(
            'request $destinationAddress  should not be empty .'
        );
    }
    // 校验 nexthopType 是否为空
    if (empty($nexthopType)) {
        throw new \InvalidArgumentException(
            'request $nexthopType  should not be empty .'
        );
    }
    // 校验 description 是否为空
    if (empty($description)) {
        throw new \InvalidArgumentException(
            'request $descrption  should not be empty .'
        );
    }
    $body['routeTableId'] = $routeTableId;
    $body['sourceAddress'] = $sourceAddress;
    $body['destinationAddress'] = $destinationAddress;
    $body['nexthopId'] = $nexthopId;
    $body['nexthopType'] = $nexthopType;
    $body['description'] = $description;
    return $this->sendRequest(
        HttpMethod::POST,
        array(
            'config' => $config,
            'params' => $params,
            'body' => json_encode($body),
        ),
        '/route/rule'
    );
}

public function deleteRouteRule($routeRuleId, $clientToken = null, $options = array()) {
    $params = array();
    list($config) = $this->parseOptions($options, 'config');
    // 校验 routeRuleId 是否为空
    if(empty($routeRuleId) ) {
        throw new \InvalidArgumentException(
            'request $routeRuleId should not be empty.'
        );
    }        
    if (empty($clientToken)) {
        $params['clientToken'] = $this->generateClientToken();
    } else {
        $params['clientToken'] = $clientToken;
    }
    return $this->sendRequest(
        HttpMethod::DELETE,
        array(
            'config' => $config,
            'params' => $params,
        ),
        '/route/rule/' .$routeRuleId
    );
}