1 files changed, 97 insertions, 0 deletions
diff --git a/extlib/Net/LDAP2/SimpleFileSchemaCache.php b/extlib/Net/LDAP2/SimpleFileSchemaCache.php
new file mode 100644
index 000000000..8019654ac
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+++ b/extlib/Net/LDAP2/SimpleFileSchemaCache.php
@@ -0,0 +1,97 @@
+<?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+* overwrite the current (outdated) old cache.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;
+    }
+}