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Current File : /home/utripoli/public_html/alqalam/lib/pkp/classes/cache/CacheManager.php
<?php

/**
 * @file classes/cache/CacheManager.php
 *
 * Copyright (c) 2014-2021 Simon Fraser University
 * Copyright (c) 2000-2021 John Willinsky
 * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
 *
 * @ingroup cache
 *
 * @see GenericCache
 *
 * @brief Provides cache management functions.
 *
 */

namespace PKP\cache;

use PKP\config\Config;
use PKP\core\Core;
use PKP\core\Registry;

define('CACHE_TYPE_FILE', 1);
define('CACHE_TYPE_OBJECT', 2);

class CacheManager
{
    /**
     * Get the static instance of the cache manager.
     *
     * @return CacheManager
     */
    public static function getManager()
    {
        $manager = & Registry::get('cacheManager', true, null);
        if ($manager === null) {
            $manager = new CacheManager();
        }
        return $manager;
    }

    /**
     * Get a file cache.
     *
     * @param string $context
     * @param string $cacheId
     * @param callable $fallback
     *
     * @return FileCache
     */
    public function getFileCache($context, $cacheId, $fallback)
    {
        return new FileCache(
            $context,
            $cacheId,
            $fallback,
            $this->getFileCachePath()
        );
    }

    public function getObjectCache($context, $cacheId, $fallback)
    {
        return $this->getCache($context, $cacheId, $fallback, CACHE_TYPE_OBJECT);
    }

    public function getCacheImplementation($type)
    {
        switch ($type) {
            case CACHE_TYPE_FILE: return 'file';
            case CACHE_TYPE_OBJECT: return Config::getVar('cache', 'object_cache');
            default: return null;
        }
    }

    /**
     * Get a cache.
     *
     * @param string $context
     * @param string $cacheId
     * @param ?callable $fallback
     * @param string $type Type of cache: CACHE_TYPE_...
     *
     * @return GenericCache
     */
    public function getCache($context, $cacheId, $fallback, $type = CACHE_TYPE_FILE)
    {
        switch ($this->getCacheImplementation($type)) {
            case 'xcache':
                $cache = new \PKP\cache\XCacheCache(
                    $context,
                    $cacheId,
                    $fallback
                );
                break;
            case 'apc':
                $cache = new \PKP\cache\APCCache(
                    $context,
                    $cacheId,
                    $fallback
                );
                break;
            case 'memcache':
                $cache = new \PKP\cache\MemcacheCache(
                    $context,
                    $cacheId,
                    $fallback,
                    Config::getVar('cache', 'memcache_hostname'),
                    Config::getVar('cache', 'memcache_port')
                );
                break;
            case '': // Provide a default if not specified
            case 'file':
                $cache = $this->getFileCache($context, $cacheId, $fallback);
                break;
            case 'none':
                $cache = new \PKP\cache\GenericCache(
                    $context,
                    $cacheId,
                    $fallback
                );
                break;
            default:
                exit("Unknown cache type \"{$type}\"!\n");
        }
        return $cache;
    }

    /**
     * Get the path in which file caches will be stored.
     *
     * @return string The full path to the file cache directory
     */
    public static function getFileCachePath()
    {
        return Core::getBaseDir() . '/cache';
    }

    /**
     * Flush an entire context, if specified, or
     * the whole cache.
     *
     * @param string $context The context to flush, if only one is to be flushed
     * @param string $type The type of cache to flush
     */
    public function flush($context = null, $type = CACHE_TYPE_FILE)
    {
        $cacheImplementation = $this->getCacheImplementation($type);
        switch ($cacheImplementation) {
            case 'xcache':
            case 'apc':
            case 'memcache':
                $junkCache = $this->getCache($context, null, null);
                $junkCache->flush();
                break;
            case 'file':
                $filePath = $this->getFileCachePath();
                $files = glob("{$filePath}/fc-" . (isset($context) ? $context . '-' : '') . '*.php');
                foreach ($files as $file) {
                    @unlink($file);
                }
                break;
            case '':
            case 'none':
                // Nothing necessary.
                break;
            default:
                exit("Unknown cache type \"{$type}\"!\n");
        }
    }
}

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