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<?php |
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/** |
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* @package midcom.services |
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* @author The Midgard Project, http://www.midgard-project.org |
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* @copyright The Midgard Project, http://www.midgard-project.org |
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* @license http://www.gnu.org/licenses/lgpl.html GNU Lesser General Public License |
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*/ |
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use Symfony\Component\Cache\Adapter\AdapterInterface; |
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/** |
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* The Memory caching system is geared to hold needed information available quickly. |
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* There are a number of limitations you have to deal with, when working with the |
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* Memory Cache. |
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* |
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* Number One, you cannot put arbitrary keys into the cache. Since the memcached |
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* php extension does not support key listings, you are bound to use MidCOM object |
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* GUIDs as cache keys, whatever you do. To allow for different subsystems of the |
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* Framework to share the cache, I have introduce "Data groups", which are suffixes |
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* for the actual cache information. Thus, all keys in the cache follow a |
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* "{$datagroup}-{$guid}" naming scheme. These groups need to be registered in the |
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* MidCOM configuration key <i>cache_module_memcache_data_groups</i>. |
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* |
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* Number Two, it is entirely possible (as it is the default), that the memcache |
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* is actually not available, as no memcache daemon has been found. This is |
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* controlled by the <i>cache_module_memcache_backend</i> configuration option, |
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* which tries to auto-detect a sensible default. If it is set to the name of a caching module |
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* it will actually start caching. Otherwise it will silently ignore |
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* put requests, and reports all keys as not existent. |
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* |
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* Number Three, as at least memcache's contains() check isn't working on some machines, key |
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* values of false are forbidden, as they are used to check a keys existence |
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* during the get cycle. You should also avoid null and 0 members, if possible, |
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* they could naturally be error prone if you start forgetting about the typed |
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* comparisons. |
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* |
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* <b>Special functionality</b> |
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* |
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* - Interface to the PARENT caching group, has a few simple shortcuts to the |
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* access the available information. |
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* |
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* @package midcom.services |
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*/ |
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class midcom_services_cache_module_memcache extends midcom_services_cache_module |
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{ |
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/** |
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* List of known data groups. See the class introduction for details. |
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* |
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* @var array |
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*/ |
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private $_data_groups = []; |
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public function __construct(midcom_config $config, AdapterInterface $backend) |
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{ |
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parent::__construct($backend); |
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$this->_data_groups = $config->get_array('cache_module_memcache_data_groups'); |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function invalidate(string $guid, $object = null) |
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{ |
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foreach ($this->_data_groups as $group) { |
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if ($group == 'ACL') { |
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$this->backend->deleteItem("{$group}-SELF-{$guid}"); |
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$this->backend->deleteItem("{$group}-CONTENT-{$guid}"); |
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} else { |
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$this->backend->deleteItem("{$group}-{$guid}"); |
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} |
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} |
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} |
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/** |
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* Looks up a value in the cache and returns it. Not existent |
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* keys are caught in this call as well |
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* |
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* @return mixed The cached value on success, false on failure. |
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*/ |
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public function get(string $data_group, string $key) |
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{ |
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$item = $this->backend->getItem("{$data_group}-{$key}"); |
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if ($item->isHit()) { |
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return $item->get(); |
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} |
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return false; |
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} |
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/** |
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* Sets a given key in the cache. If the data group is unknown, a Warning-Level error |
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* is logged and putting is denied. |
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*/ |
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public function put(string $data_group, string $key, $data, int $timeout = null) |
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{ |
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if (!in_array($data_group, $this->_data_groups)) { |
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debug_add("Tried to add data to the unknown data group {$data_group}, cannot do that.", MIDCOM_LOG_WARN); |
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debug_print_r('Known data groups:', $this->_data_groups); |
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debug_print_function_stack('We were called from here:'); |
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return; |
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} |
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$item = $this->backend |
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->getItem("{$data_group}-{$key}") |
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->set($data) |
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->expiresAfter($timeout); |
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$this->backend->save($item); |
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} |
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/** |
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* This is a little helper that tries to look up a GUID in the memory |
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* cache's PARENT data group. If it is not found, false is returned. |
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* If the object has no parent, the array value is null |
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* |
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* @return array|false The classname => GUID pair or false when nothing is in cache |
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*/ |
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public function lookup_parent_data(string $guid) |
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{ |
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return $this->get('PARENT', $guid); |
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} |
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/** |
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* This is a little helper that saves a parent GUID and class in the memory |
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* cache's PARENT data group. |
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*/ |
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public function update_parent_data(string $object_guid, array $parent_data) |
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{ |
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$this->put('PARENT', $object_guid, $parent_data); |
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} |
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} |
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flack /
openpsa
