<?php
/**
* class Phata\Widgetfy\Utils\Cache\FileCache
*
* Licence:
*
* This file is part of Widgetfy.
*
* Widgetfy is free software: you can redistribute
* it and/or modify it under the terms of the GNU
* Lesser General Public License as published by the
* Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* Widgetfy 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 Lesser
* General Public Licensefor more details.
*
* You should have received a copy of the GNU Lesser
* General Public License along with Widgetfy. If
* not, see <http://www.gnu.org/licenses/lgpl.html>.
*
* Description:
*
* This file defines Phata\Widgetfy\Utils\Cache\FileCache
* which is the default implementation of
* Phata\Widgetfy\Utils\Cache\Common
*
* @package Widgetfy
* @author Koala Yeung <koalay@gmail.com>
* @copyright 2014 Koala Yeung
* @licence http://www.gnu.org/licenses/lgpl.html
* @link http://github.com/Phata/Widgetfy
*/
namespace Phata\Widgetfy\Utils\Cache;
class FileCache implements Common {
public $base_dir = '';
public function __construct($base_dir=FALSE) {
if (($base_dir == FALSE)) {
$base_dir = sys_get_temp_dir() . DIRECTORY_SEPARATOR . 'widgetfy';
}
if (!is_dir($base_dir)) {
// create the directory recursively
if (!mkdir($base_dir, 0777, TRUE)) {
throw new Exception('Failed to locate or create base directory for FileCache');
}
}
$this->base_dir = $base_dir;
}
public function filename($group, $key) {
return str_replace(array('/', '\\'), '_', $group.'_'.md5($key));
}
public function fullpath($filename) {
return $this->base_dir.DIRECTORY_SEPARATOR.$filename;
}
public function exists($group, $key) {
$cache_filename = $this->filename($group, $key);
return file_exists($this->fullpath($cache_filename));
}
public function get($group, $key) {
if ($this->exists($group, $key)) {
$cache_filename = $this->filename($group, $key);
return unserialize(file_get_contents($this->fullpath($cache_filename)));
}
return NULL;
}
public function set($group, $key, $value) {
$result = FALSE;
$cache_filename = $this->filename($group, $key);
$fh = fopen($this->fullpath($cache_filename), 'w+');
if ($fh !== FALSE) $result = fwrite($fh, serialize($value));
fclose($fh);
chmod($this->fullpath($cache_filename), 0600);
return $result;
}
}
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