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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4: */
/**
* File containing the example simple file based Schema Caching class.
*
* PHP version 5
*
* @category Net
* @package Net_LDAP2
* @author Benedikt Hallinger <beni@php.net>
* @copyright 2009 Benedikt Hallinger
* @license http://www.gnu.org/licenses/lgpl-3.0.txt LGPLv3
* @version SVN: $Id: SimpleFileSchemaCache.php 286718 2009-08-03 07:30:49Z beni $
* @link http://pear.php.net/package/Net_LDAP2/
*/
/**
* A simple file based schema cacher with cache aging.
*
* Once the cache is too old, the loadSchema() method will return false, so
* Net_LDAP2 will fetch a fresh object from the LDAP server that will
* overwrite the current (outdated) old cache.
*/
class Net_LDAP2_SimpleFileSchemaCache implements Net_LDAP2_SchemaCache
{
/**
* Internal config of this cache
*
* @see Net_LDAP2_SimpleFileSchemaCache()
* @var array
*/
protected $config = array(
'path' => '/tmp/Net_LDAP_Schema.cache',
'max_age' => 1200
);
/**
* Initialize the simple cache
*
* Config is as following:
* path Complete path to the cache file.
* max_age Maximum age of cache in seconds, 0 means "endlessly".
*
* @param array $cfg Config array
*/
public function Net_LDAP2_SimpleFileSchemaCache($cfg)
{
foreach ($cfg as $key => $value) {
if (array_key_exists($key, $this->config)) {
if (gettype($this->config[$key]) != gettype($value)) {
$this->getCore()->dropFatalError(__CLASS__.": Could not set config! Key $key does not match type ".gettype($this->config[$key])."!");
}
$this->config[$key] = $value;
} else {
$this->getCore()->dropFatalError(__CLASS__.": Could not set config! Key $key is not defined!");
}
}
}
/**
* Return the schema object from the cache
*
* If file is existent and cache has not expired yet,
* then the cache is deserialized and returned.
*
* @return Net_LDAP2_Schema|Net_LDAP2_Error|false
*/
public function loadSchema()
{
$return = false; // Net_LDAP2 will load schema from LDAP
if (file_exists($this->config['path'])) {
$cache_maxage = filemtime($this->config['path']) + $this->config['max_age'];
if (time() <= $cache_maxage || $this->config['max_age'] == 0) {
$return = unserialize(file_get_contents($this->config['path']));
}
}
return $return;
}
/**
* Store a schema object in the cache
*
* This method will be called, if Net_LDAP2 has fetched a fresh
* schema object from LDAP and wants to init or refresh the cache.
*
* To invalidate the cache and cause Net_LDAP2 to refresh the cache,
* you can call this method with null or false as value.
* The next call to $ldap->schema() will then refresh the caches object.
*
* @param mixed $schema The object that should be cached
* @return true|Net_LDAP2_Error|false
*/
public function storeSchema($schema) {
file_put_contents($this->config['path'], serialize($schema));
return true;
}
}
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