class.ilApc.php

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<?php

require_once('./Services/GlobalCache/classes/class.ilGlobalCacheService.php');
require_once('./Services/Environment/classes/class.ilRuntime.php');

class ilApc extends ilGlobalCacheService
{
    const MIN_MEMORY = 16;
    const CACHE_ID = 'user';


    public function exists($key)
    {
        if (function_exists('apcu_exists')) {
            return apcu_exists($this->returnKey($key));
        } else {
            return apcu_fetch($this->returnKey($key));
        }
    }


    public function set($key, $serialized_value, $ttl = 0)
    {
        return apcu_store($this->returnKey($key), $serialized_value, $ttl);
    }


    public function get($key)
    {
        return apcu_fetch($this->returnKey($key));
    }


    public function delete($key)
    {
        return apcu_delete($this->returnKey($key));
    }


    public function flush($complete = false)
    {
        // incomplete flushing is not supported by APCu, an own implementation caused issues like https://mantis.ilias.de/view.php?id=28201
        return function_exists('apcu_clear_cache') && apcu_clear_cache();
    }


    public function serialize($value)
    {
        return ($value);
    }


    public function unserialize($serialized_value)
    {
        return ($serialized_value);
    }


    public function getInfo()
    {
        $return = array();

        $cache_info = apc_cache_info();

        unset($cache_info['cache_list']);
        unset($cache_info['slot_distribution']);

        $return['__cache_info'] = array(
            'apc.enabled' => ini_get('apc.enabled'),
            'apc.shm_size' => ini_get('apc.shm_size'),
            'apc.shm_segments' => ini_get('apc.shm_segments'),
            'apc.gc_ttl' => ini_get('apc.gc_ttl'),
            'apc.user_ttl' => ini_get('apc.ttl'),
            'info' => $cache_info,
        );

        $cache_info = apc_cache_info();
        foreach ($cache_info['cache_list'] as $dat) {
            $key = $dat['key'];

            if (preg_match('/' . $this->getServiceId() . '_' . $this->getComponent() . '/', $key)) {
                $return[$key] = apc_fetch($key);
            }
        }

        return $return;
    }


    protected function getActive()
    {
        return function_exists('apcu_store');
    }


    protected function getInstallable()
    {
        return function_exists('apcu_store');
    }


    protected function getMemoryLimit()
    {
        if (ilRuntime::getInstance()->isHHVM()) {
            return $this->getMinMemory() . 'M';
        }

        return ini_get('apc.shm_size');
    }


    protected function getMinMemory()
    {
        return self::MIN_MEMORY;
    }


    public function isValid($key)
    {
        return true;
    }
}