cacheManager - custom structure and clearCache

- 153 Posts
oori Reply #1, 16 years, 2 months ago
I have various different views of the same data (a user, in this example). currently, I use this, but i’m in the beginning of the code revision related with cache - so it can change.
```
		// CUSTOM CACHE READ
		$cacheDir = 'custom/very/custom/';
		$cachedResult = $this->modx->cacheManager->get($cacheDir.$userId);
		if (!empty($cachedResult)) return $cachedResult;

		$result = array();
.
.
all the code
.
.

		// CUSTOM CACHE WRITE
		$this->modx->cacheManager->writeTree($cacheDir);
		$this->modx->cacheManager->set($cacheDir.$userId,$result);
		return $result;
```
1. clearCache - clearing multiple files related with an id (user, for example)
a. could is recurse folders to remove all (id) ’3.cache.php’ ?
(otherwise, store in single folder)
b. could it remove from single folder by wildcard? ’3_*.cache.php’

otherwise - i’d do a class to manage these custom folders list, and a function to recurse through them. what is the recommended approach to this?

2. (future-proof) which method would be "memcached-ready"?

thanks in advance
- 153 Posts
oori Reply #2, 16 years, 2 months ago

(Question #1)
Looking at modCacheManager class (line 445), i see the answer to question (1) is - ’no, well kind of..’. It can clear a folder (and decedents) and specific file(s).
This is not an issue - as anyway I’ll use my own clearCache function. deleteTree function has delete_exclude_patterns, so regex can help : ’/^((?!’.$cacheKey.’).)*$/’

The only thing that would be ’nice to have’ is that the site-wide clear-cache (via manager) would read also a setting to clearCache - custom cache paths (without modding \core\model\modx\processors\system\clearcache.php :18)
I understand this could be resolved via a Plugin on OnCacheUpdate event, but I prefer not to (as /manager-clear_cache is really a misc function in my setup and -

"Any plugins registered to your events would be loaded into the context cache of every context in the system" - OpenGeek
http://modxcms.com/forums/index.php/topic,43595.msg260255.html#msg260255

more generic - would be nice if a (custom) class construct could register it’s cache-path for this purpose. Adding caching to any add-on, for example getResources’s rendered views (by tpl) would be a quite simple - as most modx setups use the manager interface - clearing the entire cache on each action (by default).

(Question #2)
’yes’ - I see: xpdomemcache.class.php, well done - mr. generic
Also, I see the way it’s implemented in modCacheManager->clearCache : first [’objects’] delete from whatever cache handler, then [’path’] optionally removes from file-system.
Then - digging in xpdocachemanager.class.php, I just wanna say: jason, great stuff!

thanks.