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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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namespace core_cache;
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/**
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* Versionable cache data source.
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*
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* This interface extends the main cache data source interface to add an extra required method if
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* the data source is to be used for a versioned cache.
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*
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* @package core_cache
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* @copyright Sam Hemelryk
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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interface versionable_data_source_interface extends data_source_interface {
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/**
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* Loads the data for the key provided ready formatted for caching.
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*
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* If there is no data for that key, or if the data for the required key has an older version
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* than the specified $requiredversion, then this returns null.
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*
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* If there is data then $actualversion should be set to the actual version number retrieved
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* (may be the same as $requiredversion or newer).
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*
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* @param string|int $key The key to load.
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* @param int $requiredversion Minimum required version
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* @param mixed $actualversion Should be set to the actual version number retrieved
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* @return mixed What ever data should be returned, or false if it can't be loaded.
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*/
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public function load_for_cache_versioned($key, int $requiredversion, &$actualversion);
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}
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// Alias this class to the old name.
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// This file will be autoloaded by the legacyclasses autoload system.
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// In future all uses of this class will be corrected and the legacy references will be removed.
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class_alias(versionable_data_source_interface::class, \cache_data_source_versionable::class);
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