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117 lines
3.7 KiB
117 lines
3.7 KiB
<?php
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP
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*
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* This content is released under the MIT License (MIT)
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*
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* Copyright (c) 2014-2019 British Columbia Institute of Technology
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* Copyright (c) 2019 CodeIgniter Foundation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @package CodeIgniter
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* @author CodeIgniter Dev Team
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* @copyright 2019 CodeIgniter Foundation
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* @license https://opensource.org/licenses/MIT MIT License
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* @link https://codeigniter.com
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* @since Version 4.0.0
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* @filesource
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*/
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namespace CodeIgniter\Cache;
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use CodeIgniter\Cache\Exceptions\CacheException;
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use CodeIgniter\Exceptions\CriticalError;
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/**
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* Class Cache
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*
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* A factory for loading the desired
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*
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* @package CodeIgniter\Cache
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*/
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class CacheFactory
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{
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/**
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* Attempts to create the desired cache handler, based upon the
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*
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* @param $config
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* @param string $handler
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* @param string $backup
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*
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* @return \CodeIgniter\Cache\CacheInterface
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*/
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public static function getHandler($config, string $handler = null, string $backup = null)
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{
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if (! isset($config->validHandlers) || ! is_array($config->validHandlers))
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{
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throw CacheException::forInvalidHandlers();
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}
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if (! isset($config->handler) || ! isset($config->backupHandler))
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{
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throw CacheException::forNoBackup();
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}
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$handler = ! empty($handler) ? $handler : $config->handler;
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$backup = ! empty($backup) ? $backup : $config->backupHandler;
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if (! array_key_exists($handler, $config->validHandlers) || ! array_key_exists($backup, $config->validHandlers))
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{
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throw CacheException::forHandlerNotFound();
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}
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// Get an instance of our handler.
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$adapter = new $config->validHandlers[$handler]($config);
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if (! $adapter->isSupported())
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{
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$adapter = new $config->validHandlers[$backup]($config);
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if (! $adapter->isSupported())
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{
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// Log stuff here, don't throw exception. No need to raise a fuss.
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// Fall back to the dummy adapter.
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$adapter = new $config->validHandlers['dummy']();
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}
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}
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// If $adapter->initialization throws a CriticalError exception, we will attempt to
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// use the $backup handler, if that also fails, we resort to the dummy handler.
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try
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{
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$adapter->initialize();
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}
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catch (CriticalError $e)
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{
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// log the fact that an exception occurred as well what handler we are resorting to
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log_message('critical', $e->getMessage() . ' Resorting to using ' . $backup . ' handler.');
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// get the next best cache handler (or dummy if the $backup also fails)
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$adapter = self::getHandler($config, $backup, 'dummy');
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}
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return $adapter;
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}
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//--------------------------------------------------------------------
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}
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