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* overwrite the current (outdated) old cache.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