Question

Good day,

I have run into some problem in the Zend_Cache_Frontend_Page. I want to use Zend_Cache_Frontend_Page to caching some of pages. But it does not work.

protected function _initBookPageCaching()
{
    Zend_Controller_Front::getInstance()->setParam('disableOutputBuffering',true);      
    // cache book pages
    $frontendOptionsPages = array(
       'lifetime' => 2592000,
       'debug_header' => true, // for debugging
       'regexps' => array(
           // cache the whole IndexController
           '^/$' => array('cache' => true),
           '^/download-free-ebook/.*' => array('cache' => true)
       )
    );

    $backendOptionsPages = array(
        'cache_dir' =>  APPLICATION_PATH.'/../cache'
    );

    $cacheBookPages = Zend_Cache::factory(
                         'Page',
                         'File',
                         $frontendOptionsPages,
                         $backendOptionsPages);

    $cacheBookPages->start();
}

i set above method into Bootstrap.php file.

Please help me solve this problem.

Thanks for advance.

Answer 1

I never actually use Zend_Controller_Front::getInstance() in my bootstrap, rather I use:

$this->bootstrap('frontController');

followed by:

$front = $this->getResource('frontController');

with which you could try:

$front->setParam('disableOutputBuffering', true);

Also, I’m not sure what the acceptable regex’s are for controllers and what not. Maybe try changing '^/download-free-ebook/.*' to '^/download-free-ebook/'. And see if just the index action for that controller at least caches.

EDIT:
I found the issue. $cache->start(); is returning false so I did some debugging. You’re not passing a cache id (e.g. $cacheBookPages->start('some_cache_id');) so Zend_Cache_Frontend_Page attempts to make one for you on line 261. like so:

// from Zend/Cache/Frontend/Page.php
public function start($id = false, $doNotDie = false)
{
    // ....
    if (!$id) {
        $id = $this->_makeId();
        if (!$id) {
            return false;
        }
    }
    // ....
}

So after following the rabbit trail, I realized that it was trying to build a cache id based off the following arrays: $_GET, $_POST, $_SESSION, $_COOKIE and $_FILES. Since none of those are set it is unable to create a cache id! And since it can’t create a cache id, it can’t create the cache file.

Solution:

$uri      = explode('/', $_SERVER['REQUEST_URI']);
$cacheKey = array();
foreach ($uri as $key) {
    if (empty($key)) {
        continue 1;
    }
    $cacheKey[] = $key;
}

$cacheBookPages->start('page_cache_' . implode('_', $cacheKey));