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time_last_message_between_users.php
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time_last_message_between_users.php
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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Cache data source for the time of the last message between users.
*
* @package core_message
* @category cache
* @copyright 2016 Ryan Wyllie <ryan@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace core_message;
defined('MOODLE_INTERNAL') || die();
/**
* Cache data source for the time of the last message in a conversation.
*
* @package core_message
* @category cache
* @copyright 2016 Ryan Wyllie <ryan@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class time_last_message_between_users implements \cache_data_source {
/** @var time_last_message_between_users the singleton instance of this class. */
protected static $instance = null;
/**
* Returns an instance of the data source class that the cache can use for loading data using the other methods
* specified by the cache_data_source interface.
*
* @param \cache_definition $definition
* @return object
*/
public static function get_instance_for_cache(\cache_definition $definition) {
if (is_null(self::$instance)) {
self::$instance = new time_last_message_between_users();
}
return self::$instance;
}
/**
* Loads the data for the key provided ready formatted for caching.
*
* @param string|int $key The key to load.
* @return mixed What ever data should be returned, or false if it can't be loaded.
*/
public function load_for_cache($key) {
$message = api::get_most_recent_conversation_message($key);
if ($message) {
return $message->timecreated;
} else {
return null;
}
}
/**
* Loads several keys for the cache.
*
* @param array $keys An array of keys each of which will be string|int.
* @return array An array of matching data items.
*/
public function load_many_for_cache(array $keys) {
$results = [];
foreach ($keys as $key) {
$results[] = $this->load_for_cache($key);
}
return $results;
}
}