Zend Cache + Zend Feed Rss, not happy together

santouras · #1 (**permalink**) 07-05-2007, 06:58 AM

I sent this to the mailing list but no harm asking here as well

I'm basically caching a feed so its not requested on every page hit. Here's my
code

PHP Code:


			
//load the cache

Zend_Loader::loadClass('Zend_Cache');

//load up Zend_Feed

Zend_Loader::loadClass('Zend_Feed_Rss');

    

$cache_f = array(

'lifetime' => 60*5,

'automatic_serialization' => true

);

 

$cache_b = array(

'cache_dir' => '../cache/'

);

 

$cache = Zend_Cache::factory('Core', 'File', $cache_f, $cache_b);

 

if (!$lastFM = $cache->load('lastfm')) {

    $lastFM = new 

Zend_Feed_Rss('http://ws.audioscrobbler.com/1.0/user/santouras/recenttracks.rss');

    

    $cache->save($lastFM, 'lastfm');

}

On first load I get this error when I save the cache

Code:

Warning: Invalid argument supplied for foreach() 
in /opt/lampp/htdocs/santouras/library/Zend/Feed/Element.php on line 322

On subsequent loads the object looks like it has all its data in there
correctly, just that this warning is being thrown. Any ideas?

Maugrim The Reaper · #2 (**permalink**) 07-05-2007, 07:53 AM

Can you check if the warning occurs when Zend_Cache is removed from the equation?

It might, possibly, just be an invalid RSS document. Happens sometimes. But certaintly let the mailing list know (don't see your post there yet?) so someone working on Zend_Feed can take a better look.

santouras · #3 (**permalink**) 07-05-2007, 07:56 AM

Script works beautifully without the cache in there. I haven't actually tried it with another feed which I'll do later on today

steev · #4 (**permalink**) 02-05-2008, 05:20 PM

Anyone know if this was ever resolved?

im trying to do pretty much the same thing, but with an object, not the rss feed. I thought i could just pass objects into the cache object...obviously not!

Overmind · #5 (**permalink**) 02-08-2008, 11:09 AM

I'm also interested in the resolution to this problem. I'm in the same situation of santouras.

kness · #6 (**permalink**) 05-22-2008, 06:26 PM

The problem is that the Zend_Feed_Rss object is being put to sleep, but not woken after serializing by the Zend Cache.

Add this line after calling $cache->save(...):

$lastFM->__wakeup();

This is definitely a bug. Now, whether it's with the Zend_Feed_Rss, or with Zend_Cache, I don't know.

Davidoff · #7 (**permalink**) 05-28-2008, 10:30 AM

I had a similar problem with caching because the XML references in the Feed's objects were not valid. Wakeup probably would have fixed this but I couldn't figure it out at the time.

As I was loading content from several feeds, merging, and sorting by date my solution was to put data from the entries into a two dimensional array and cache that array. So the array just contained arrays of strings, rather than the elements themselves.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode