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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\lock;
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use coding_exception;
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/**
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* Lock factory for use during installation.
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*
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* @package core
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* @category lock
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* @copyright Andrew Nicols <andrew@nicols.co.uk>
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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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class installation_lock_factory implements lock_factory {
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/**
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* Create this lock factory.
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*
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* @param string $type - The type, e.g. cron, cache, session
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*/
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public function __construct($type) {
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}
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/**
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* Return information about the blocking behaviour of the lock type on this platform.
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*
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* @return boolean - False if attempting to get a lock will block indefinitely.
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*/
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public function supports_timeout() {
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return true;
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}
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/**
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* This lock type will be automatically released when a process ends.
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*
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* @return boolean - True
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*/
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public function supports_auto_release() {
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return true;
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}
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/**
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* This lock factory is only available during the initial installation.
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* To use it at any other time would be potentially dangerous.
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*
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* @return boolean
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*/
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public function is_available() {
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return during_initial_install();
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}
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/**
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* Get some info that might be useful for debugging.
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* @return boolean - string
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*/
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protected function get_debug_info() {
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return 'host:' . php_uname('n') . ', pid:' . getmypid() . ', time:' . time();
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}
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/**
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* Get a lock within the specified timeout or return false.
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*
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* @param string $resource - The identifier for the lock. Should use frankenstyle prefix.
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* @param int $timeout - The number of seconds to wait for a lock before giving up.
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* @param int $maxlifetime - Unused by this lock type.
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* @return boolean - true if a lock was obtained.
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*/
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public function get_lock($resource, $timeout, $maxlifetime = 86400) {
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return new lock($resource, $this);
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}
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/**
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* Release a lock that was previously obtained with @lock.
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*
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* @param lock $lock - A lock obtained from this factory.
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* @return boolean - true if the lock is no longer held (including if it was never held).
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*/
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public function release_lock(lock $lock) {
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return true;
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}
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}
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