# FileLocker.class.php

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    00001 <?php
    00002 /***************************************************************************
    00003  *   Copyright (C) 2006-2008 by Konstantin V. Arkhipov                     *
    00004  *                                                                         *
    00005  *   This program is free software; you can redistribute it and/or modify  *
    00006  *   it under the terms of the GNU Lesser General Public License as        *
    00007  *   published by the Free Software Foundation; either version 3 of the    *
    00008  *   License, or (at your option) any later version.                       *
    00009  *                                                                         *
    00010  ***************************************************************************/
    00011
    00017     final class FileLocker extends BaseLocker
    00018     {
    00019         private $directory = null;
    00020
    00021         public function __construct($directory = 'file-locking/')
    00022         {
    00023             $this->directory = ONPHP_TEMP_PATH.$directory;
    00024
    00025             if (!is_writable($this->directory)) {
    00026                 if (!mkdir($this->directory, 0700, true)) {
    00027                     throw new WrongArgumentException(
    00028                         "can not write to '{$directory}'"
    00029                     );
    00030                 }
    00031             }
    00032         }
    00033
    00034         public function get($key)
    00035         {
    00036             $this->pool[$key] = fopen($this->directory.$key, 'w+');
    00037
    00038             return flock($this->pool[$key], LOCK_EX);
    00039         }
    00040
    00041         public function free($key)
    00042         {
    00043             return flock($this->pool[$key], LOCK_UN);
    00044         }
    00045
    00046         public function drop($key)
    00047         {
    00048             try {
    00049                 fclose($this->pool[$key]);
    00050                 return unlink($this->directory.$key);
    00051             } catch (BaseException $e) {
    00052                 unset($this->pool[$key]); // already race-removed
    00053                 return false;
    00054             }
    00055         }
    00056     }
    00057 ?>