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import v1.0.0-RC4 | 2009-05-20

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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Cache
* @subpackage Zend_Cache_Backend
* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
/**
* @package Zend_Cache
* @subpackage Zend_Cache_Backend
* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Cache_Backend
{
/**
* Frontend or Core directives
*
* =====> (int) lifetime :
* - Cache lifetime (in seconds)
* - If null, the cache is valid forever
*
* =====> (int) logging :
* - if set to true, a logging is activated throw Zend_Log
*
* @var array directives
*/
protected $_directives = array(
'lifetime' => 3600,
'logging' => false,
'logger' => null
);
/**
* Available options
*
* @var array available options
*/
protected $_options = array();
/**
* Constructor
*
* @param array $options Associative array of options
* @throws Zend_Cache_Exception
* @return void
*/
public function __construct(array $options = array())
{
while (list($name, $value) = each($options)) {
$this->setOption($name, $value);
}
}
/**
* Set the frontend directives
*
* @param array $directives Assoc of directives
* @throws Zend_Cache_Exception
* @return void
*/
public function setDirectives($directives)
{
if (!is_array($directives)) Zend_Cache::throwException('Directives parameter must be an array');
while (list($name, $value) = each($directives)) {
if (!is_string($name)) {
Zend_Cache::throwException("Incorrect option name : $name");
}
$name = strtolower($name);
if (array_key_exists($name, $this->_directives)) {
$this->_directives[$name] = $value;
}
}
$this->_loggerSanity();
}
/**
* Set an option
*
* @param string $name
* @param mixed $value
* @throws Zend_Cache_Exception
* @return void
*/
public function setOption($name, $value)
{
if (!is_string($name)) {
Zend_Cache::throwException("Incorrect option name : $name");
}
$name = strtolower($name);
if (!array_key_exists($name, $this->_options)) {
Zend_Cache::throwException("Incorrect option name : $name");
}
$this->_options[$name] = $value;
}
/**
* Get the life time
*
* if $specificLifetime is not false, the given specific life time is used
* else, the global lifetime is used
*
* @param int $specificLifetime
* @return int Cache life time
*/
public function getLifetime($specificLifetime)
{
if ($specificLifetime === false) {
return $this->_directives['lifetime'];
}
return $specificLifetime;
}
/**
* Return true if the automatic cleaning is available for the backend
*
* DEPRECATED : use getCapabilities() instead
*
* @deprecated
* @return boolean
*/
public function isAutomaticCleaningAvailable()
{
return true;
}
/**
* Return a system-wide tmp directory
*
* @return string System-wide tmp directory
*/
static function getTmpDir()
{
if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
// windows...
foreach (array($_ENV, $_SERVER) as $tab) {
foreach (array('TEMP', 'TMP', 'windir', 'SystemRoot') as $key) {
if (isset($tab[$key])) {
$result = $tab[$key];
if (($key == 'windir') or ($key == 'SystemRoot')) {
$result = $result . '\\temp';
}
return $result;
}
}
}
return '\\temp';
} else {
// unix...
if (isset($_ENV['TMPDIR'])) return $_ENV['TMPDIR'];
if (isset($_SERVER['TMPDIR'])) return $_SERVER['TMPDIR'];
return '/tmp';
}
}
/**
* Make sure if we enable logging that the Zend_Log class
* is available.
* Create a default log object if none is set.
*
* @throws Zend_Cache_Exception
* @return void
*/
protected function _loggerSanity()
{
if (!isset($this->_directives['logging']) || !$this->_directives['logging']) {
return;
}
try {
/**
* @see Zend_Log
*/
require_once 'Zend/Log.php';
} catch (Zend_Exception $e) {
Zend_Cache::throwException('Logging feature is enabled but the Zend_Log class is not available');
}
if (isset($this->_directives['logger']) && $this->_directives['logger'] instanceof Zend_Log) {
return;
}
// Create a default logger to the standard output stream
require_once 'Zend/Log/Writer/Stream.php';
$logger = new Zend_Log(new Zend_Log_Writer_Stream('php://output'));
$this->_directives['logger'] = $logger;
}
/**
* Log a message at the WARN (4) priority.
*
* @param string $message
* @throws Zend_Cache_Exception
* @return void
*/
protected function _log($message, $priority = 4)
{
if (!$this->_directives['logging']) {
return;
}
if (!(isset($this->_directives['logger']) || $this->_directives['logger'] instanceof Zend_Log)) {
Zend_Cache::throwException('Logging is enabled but logger is not set');
}
$logger = $this->_directives['logger'];
$logger->log($message, $priority);
}
}