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Code Editor : LockHandler.php
<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\Filesystem; use Symfony\Component\Filesystem\Exception\IOException; use Symfony\Component\Lock\Store\FlockStore; use Symfony\Component\Lock\Store\SemaphoreStore; @trigger_error(sprintf('The %s class is deprecated since Symfony 3.4 and will be removed in 4.0. Use %s or %s instead.', LockHandler::class, SemaphoreStore::class, FlockStore::class), \E_USER_DEPRECATED); /** * LockHandler class provides a simple abstraction to lock anything by means of * a file lock. * * A locked file is created based on the lock name when calling lock(). Other * lock handlers will not be able to lock the same name until it is released * (explicitly by calling release() or implicitly when the instance holding the * lock is destroyed). * * @author Grégoire Pineau <lyrixx@lyrixx.info> * @author Romain Neutron <imprec@gmail.com> * @author Nicolas Grekas <p@tchwork.com> * * @deprecated since version 3.4, to be removed in 4.0. Use Symfony\Component\Lock\Store\SemaphoreStore or Symfony\Component\Lock\Store\FlockStore instead. */ class LockHandler { private $file; private $handle; /** * @param string $name The lock name * @param string|null $lockPath The directory to store the lock. Default values will use temporary directory * * @throws IOException If the lock directory could not be created or is not writable */ public function __construct($name, $lockPath = null) { $lockPath = $lockPath ?: sys_get_temp_dir(); if (!is_dir($lockPath)) { $fs = new Filesystem(); $fs->mkdir($lockPath); } if (!is_writable($lockPath)) { throw new IOException(sprintf('The directory "%s" is not writable.', $lockPath), 0, null, $lockPath); } $this->file = sprintf('%s/sf.%s.%s.lock', $lockPath, preg_replace('/[^a-z0-9\._-]+/i', '-', $name), hash('sha256', $name)); } /** * Lock the resource. * * @param bool $blocking Wait until the lock is released * * @return bool Returns true if the lock was acquired, false otherwise * * @throws IOException If the lock file could not be created or opened */ public function lock($blocking = false) { if ($this->handle) { return true; } $error = null; // Silence error reporting set_error_handler(function ($errno, $msg) use (&$error) { $error = $msg; }); if (!$this->handle = fopen($this->file, 'r+') ?: fopen($this->file, 'r')) { if ($this->handle = fopen($this->file, 'x')) { chmod($this->file, 0666); } elseif (!$this->handle = fopen($this->file, 'r+') ?: fopen($this->file, 'r')) { usleep(100); // Give some time for chmod() to complete $this->handle = fopen($this->file, 'r+') ?: fopen($this->file, 'r'); } } restore_error_handler(); if (!$this->handle) { throw new IOException($error, 0, null, $this->file); } // On Windows, even if PHP doc says the contrary, LOCK_NB works, see // https://bugs.php.net/54129 if (!flock($this->handle, \LOCK_EX | ($blocking ? 0 : \LOCK_NB))) { fclose($this->handle); $this->handle = null; return false; } return true; } /** * Release the resource. */ public function release() { if ($this->handle) { flock($this->handle, \LOCK_UN | \LOCK_NB); fclose($this->handle); $this->handle = null; } } }
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