266 Zeilen
7,5 KiB
PHP
266 Zeilen
7,5 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Cache
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* @subpackage Zend_Cache_Backend
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* @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id$
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*/
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/**
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* @package Zend_Cache
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* @subpackage Zend_Cache_Backend
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* @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Cache_Backend
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{
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/**
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* Frontend or Core directives
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*
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* =====> (int) lifetime :
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* - Cache lifetime (in seconds)
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* - If null, the cache is valid forever
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*
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* =====> (int) logging :
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* - if set to true, a logging is activated throw Zend_Log
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*
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* @var array directives
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*/
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protected $_directives = array(
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'lifetime' => 3600,
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'logging' => false,
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'logger' => null
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);
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/**
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* Available options
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*
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* @var array available options
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*/
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protected $_options = array();
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/**
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* Constructor
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*
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* @param array $options Associative array of options
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* @throws Zend_Cache_Exception
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* @return void
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*/
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public function __construct(array $options = array())
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{
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while (list($name, $value) = each($options)) {
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$this->setOption($name, $value);
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}
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}
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/**
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* Set the frontend directives
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*
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* @param array $directives Assoc of directives
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* @throws Zend_Cache_Exception
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* @return void
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*/
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public function setDirectives($directives)
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{
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if (!is_array($directives)) Zend_Cache::throwException('Directives parameter must be an array');
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while (list($name, $value) = each($directives)) {
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if (!is_string($name)) {
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Zend_Cache::throwException("Incorrect option name : $name");
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}
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$name = strtolower($name);
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if (array_key_exists($name, $this->_directives)) {
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$this->_directives[$name] = $value;
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}
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}
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$this->_loggerSanity();
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}
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/**
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* Set an option
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*
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* @param string $name
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* @param mixed $value
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* @throws Zend_Cache_Exception
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* @return void
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*/
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public function setOption($name, $value)
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{
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if (!is_string($name)) {
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Zend_Cache::throwException("Incorrect option name : $name");
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}
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$name = strtolower($name);
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if (array_key_exists($name, $this->_options)) {
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$this->_options[$name] = $value;
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}
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}
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/**
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* Get the life time
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*
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* if $specificLifetime is not false, the given specific life time is used
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* else, the global lifetime is used
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*
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* @param int $specificLifetime
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* @return int Cache life time
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*/
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public function getLifetime($specificLifetime)
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{
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if ($specificLifetime === false) {
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return $this->_directives['lifetime'];
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}
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return $specificLifetime;
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}
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/**
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* Return true if the automatic cleaning is available for the backend
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*
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* DEPRECATED : use getCapabilities() instead
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*
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* @deprecated
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* @return boolean
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*/
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public function isAutomaticCleaningAvailable()
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{
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return true;
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}
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/**
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* Determine system TMP directory and detect if we have read access
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*
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* inspired from Zend_File_Transfer_Adapter_Abstract
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*
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* @return string
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* @throws Zend_Cache_Exception if unable to determine directory
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*/
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public function getTmpDir()
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{
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$tmpdir = array();
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foreach (array($_ENV, $_SERVER) as $tab) {
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foreach (array('TMPDIR', 'TEMP', 'TMP', 'windir', 'SystemRoot') as $key) {
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if (isset($tab[$key])) {
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if (($key == 'windir') or ($key == 'SystemRoot')) {
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$dir = realpath($tab[$key] . '\\temp');
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} else {
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$dir = realpath($tab[$key]);
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}
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if ($this->_isGoodTmpDir($dir)) {
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return $dir;
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}
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}
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}
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}
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$upload = ini_get('upload_tmp_dir');
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if ($upload) {
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$dir = realpath($upload);
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if ($this->_isGoodTmpDir($dir)) {
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return $dir;
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}
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}
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if (function_exists('sys_get_temp_dir')) {
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$dir = sys_get_temp_dir();
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if ($this->_isGoodTmpDir($dir)) {
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return $dir;
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}
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}
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// Attemp to detect by creating a temporary file
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$tempFile = tempnam(md5(uniqid(rand(), TRUE)), '');
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if ($tempFile) {
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$dir = realpath(dirname($tempFile));
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unlink($tempFile);
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if ($this->_isGoodTmpDir($dir)) {
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return $dir;
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}
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}
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if ($this->_isGoodTmpDir('/tmp')) {
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return '/tmp';
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}
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if ($this->_isGoodTmpDir('\\temp')) {
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return '\\temp';
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}
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Zend_Cache::throwException('Could not determine temp directory, please specify a cache_dir manually');
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}
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/**
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* Verify if the given temporary directory is readable and writable
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*
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* @param string $dir temporary directory
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* @return boolean true if the directory is ok
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*/
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protected function _isGoodTmpDir($dir)
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{
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if (is_readable($dir)) {
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if (is_writable($dir)) {
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return true;
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}
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}
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return false;
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}
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/**
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* Make sure if we enable logging that the Zend_Log class
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* is available.
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* Create a default log object if none is set.
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*
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* @throws Zend_Cache_Exception
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* @return void
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*/
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protected function _loggerSanity()
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{
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if (!isset($this->_directives['logging']) || !$this->_directives['logging']) {
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return;
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}
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if (isset($this->_directives['logger'])) {
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if ($this->_directives['logger'] instanceof Zend_Log) {
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return;
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}
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Zend_Cache::throwException('Logger object is not an instance of Zend_Log class.');
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}
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// Create a default logger to the standard output stream
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require_once 'Zend/Log.php';
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require_once 'Zend/Log/Writer/Stream.php';
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$logger = new Zend_Log(new Zend_Log_Writer_Stream('php://output'));
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$this->_directives['logger'] = $logger;
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}
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/**
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* Log a message at the WARN (4) priority.
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*
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* @param string $message
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* @throws Zend_Cache_Exception
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* @return void
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*/
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protected function _log($message, $priority = 4)
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{
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if (!$this->_directives['logging']) {
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return;
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}
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if (!isset($this->_directives['logger'])) {
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Zend_Cache::throwException('Logging is enabled but logger is not set.');
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}
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$logger = $this->_directives['logger'];
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if (!$logger instanceof Zend_Log) {
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Zend_Cache::throwException('Logger object is not an instance of Zend_Log class.');
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}
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$logger->log($message, $priority);
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}
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}
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