i have custom module. i can't call controller in view of my module. this url call

http://localhost/magento2-2.0.0-rc/index.php/namespace/modulename/product/view/custom/

Code file Custom.php in Namespace/Modulename/Controller

namespace Namespace\Modulename\Controller;
class Custom extends \Magento\Framework\App\Action\Action
{
    /**
     * Index action
     *
     * @return $this
     */
    public function execute()
    {
        $resultRedirect = $this->resultRedirectFactory->create();
        return $resultRedirect->setPath('/');
    }
}

This file Custom.php in Namespace/Modulename/Controller/Product/View

<?php
/**
 *
 * Copyright © 2015 Magento. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Namespace\Modulename\Controller\Product\View;


class Custom extends \Namespace\Modulename\Controller\Custom
{
    
     protected $resultForwardFactory;
   
    protected $resultPageFactory ;
     protected $_coreRegistry;
    /**
     * @param \Magento\Backend\App\Action\Context $context
     * @param \Magento\Framework\View\Result\PageFactory $resultPageFactory
     */
    public function __construct(
        \Magento\Framework\App\Action\Context $context, 
        \Magento\Framework\View\Result\PageFactory $resultPageFactory,
        \Magento\Framework\Controller\Result\ForwardFactory $resultForwardFactory,      
        \Magento\Framework\Registry $registry
            
    ) {
        $this->resultForwardFactory = $resultForwardFactory;
        $this->resultPageFactory  = $resultPageFactory;
        $this->_coreRegistry = $registry;
        parent::__construct($context);
    }   
  
    public function execute()
    {   
        $data = $this->getRequest()->getPostValue();
        print_r($data); die('xx');
    }
}

Edit routes.xml in etc/frontend

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/etc/routes.xsd">
    <router id="standard">
        <route id="modulename" frontName="modulename">
            <module name="Namespace_Modulename" />
        </route>
    </router>
</config>