Untitled

Magento pass current product ID to module
Mage::registry('current_product');

protected function _getIdentifier()
{
    return $this->_getCookieValue(Enterprise_PageCache_Model_Cookie::COOKIE_CUSTOMER, '');
}

protected function _getCacheId()
{
    return 'HOMEPAGE_PRODUCTS' . md5($this->_placeholder->getAttribute('cache_id') . ',' . $this->_placeholder->getAttribute('product_id')) . '_' . $this->_getIdentifier();
}

public function getCacheKeyInfo()
{
    $info = parent::getCacheKeyInfo();
    if (Mage::registry('current_product'))
    {
        $info['product_id'] = Mage::registry('current_product')->getId();
    }
    return $info;
}

protected function _renderBlock()
{
    $blockClass = $this->_placeholder->getAttribute('block');
    $template = $this->_placeholder->getAttribute('template');

    $block = new $blockClass;
    $block->setTemplate($template)
        ->setProductId($this->_placeholder->getAttribute('product_id'));
    return $block->toHtml();
}

protected function _initAction(){

    if(! Mage::registry('current_product')){
        Mage::register('current_product', Mage::getModel('catalog/product'));
    }

    $id = $this->getRequest()->getParam('id');
    if (!is_null($id)) {
        $model = Mage::registry('current_product')->load($id);

        if (! $model->getId()) {
            $this->_getSession()->addError(Mage::helper('catalog')->__('This product item no longer exists'));
            $this->_redirect('*/*/');
            return;
        }
    }

    return $this;
}

public function indexAction()
{
  $this->_initAction();
  // your code below
}