Category Block Cache

gistfile1.php

<?php
class Ifuel_Cache_Block_Catalog_Category_View extends Mage_Catalog_Block_Category_View
{
    protected function _construct()
    {
        $this->addData(array(
            // Long term block
            'cache_lifetime'    => 999999999,
            'cache_tags'        => array(Mage_Catalog_Model_Product::CACHE_TAG, Mage_Catalog_Model_Category::CACHE_TAG),
        ));
    }

    public function getCacheKey()
    {
        return
            'CATEGORY_CACHE' .
            md5(Mage::app()->getStore()->getWebsiteId() .
                '_' .
                Mage::helper('customer')->isLoggedIn() .
                '_' .
                Mage::helper('core/url')->getCurrentUrl());

    }
}