I'm starting to try to wrap my head around using Doctrine listeners in
the context of a symfony application, and I'm encountering some
confusion that I was hoping someone out there might be able to help me
clear up.
The rough outline of what I'm trying to accomplish is this: the site
in question has a frontend and an admin console. The frontend is
read-only, and I am caching some data using APC. I want to modify the
admin console so that any time a change is made, the APC cache is
cleared.
The code for clearing the cache is working fine... what I'm struggling
with is the most efficient place to put it so that it automatically
happens for all database changes made via the admin console. I was
hoping that I could accomplish this with a listener so that the cache
clearing code was in one central place.
So, here's what I'm doing:
1. In the configuration for the admin console, I have this:
public function initialize() {
$manager = Doctrine_Manager::getInstance();
$manager->setAttribute('use_dql_callbacks', true);
$manager->addRecordListener(new ClearCacheListener());
}
2. ClearCacheListener looks like this:
class ClearCacheListener extends Doctrine_Record_Listener
{
public function postSave(Doctrine_Event $event)
{
$this->clearCache($event);
}
// followed by identical implementations of preDqlDelete,
postDelete, preDqlUpdate, postUpdate, postInsert, as well as the
clearCache method
}
The admin console is using the sf 1.2 admin generator so it makes use
of the form framework, etc. I can see that the listener has been
registered and is kind of working, because the preDqlDelete hook gets
executed whenever I directly delete something using DQL. However, the
other hooks don't seem to fire. Am I misunderstanding what it means
to attach a listener to the manager? I thought that the listener
would fire for matching events on any model.
Thanks for any clarification on this issue. I'm looking forward to
mastering listeners as I can see that they will be incredibly handy.
David Brewer
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