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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_Frontend
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Function.php 20379 2010-01-18 14:40:57Z mabe $
*/
/**
* @see Zend_Cache_Core
*/
require_once 'Zend/Cache/Core.php';
/**
* @package Zend_Cache
* @subpackage Zend_Cache_Frontend
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Cache_Frontend_Function extends Zend_Cache_Core
{
/**
* This frontend specific options
*
* ====> (boolean) cache_by_default :
* - if true, function calls will be cached by default
*
* ====> (array) cached_functions :
* - an array of function names which will be cached (even if cache_by_default = false)
*
* ====> (array) non_cached_functions :
* - an array of function names which won't be cached (even if cache_by_default = true)
*
* @var array options
*/
protected $_specificOptions = array(
'cache_by_default' => true,
'cached_functions' => array(),
'non_cached_functions' => array()
);
/**
* Constructor
*
* @param array $options Associative array of options
* @return void
*/
public function __construct(array $options = array())
{
while (list($name, $value) = each($options)) {
$this->setOption($name, $value);
}
$this->setOption('automatic_serialization', true);
}
/**
* Main method : call the specified function or get the result from cache
*
* @param string $name Function name
* @param array $parameters Function parameters
* @param array $tags Cache tags
* @param int $specificLifetime If != false, set a specific lifetime for this cache record (null => infinite lifetime)
* @param int $priority integer between 0 (very low priority) and 10 (maximum priority) used by some particular backends
* @return mixed Result
*/
public function call($name, $parameters = array(), $tags = array(), $specificLifetime = false, $priority = 8)
{
$cacheBool1 = $this->_specificOptions['cache_by_default'];
$cacheBool2 = in_array($name, $this->_specificOptions['cached_functions']);
$cacheBool3 = in_array($name, $this->_specificOptions['non_cached_functions']);
$cache = (($cacheBool1 || $cacheBool2) && (!$cacheBool3));
if (!$cache) {
// We do not have not cache
return call_user_func_array($name, $parameters);
}
$id = $this->_makeId($name, $parameters);
if ( ($rs = $this->load($id)) && isset($rs[0], $rs[1])) {
// A cache is available
$output = $rs[0];
$return = $rs[1];
} else {
// A cache is not available (or not valid for this frontend)
ob_start();
ob_implicit_flush(false);
$return = call_user_func_array($name, $parameters);
$output = ob_get_contents();
ob_end_clean();
$data = array($output, $return);
$this->save($data, $id, $tags, $specificLifetime, $priority);
}
echo $output;
return $return;
}
/**
* Make a cache id from the function name and parameters
*
* @param string $name Function name
* @param array $parameters Function parameters
* @throws Zend_Cache_Exception
* @return string Cache id
*/
private function _makeId($name, $parameters)
{
if (!is_string($name)) {
Zend_Cache::throwException('Incorrect function name');
}
if (!is_array($parameters)) {
Zend_Cache::throwException('parameters argument must be an array');
}
return md5($name . serialize($parameters));
}
}
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