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<?php /* The NuSOAP project home is: http://sourceforge.net/projects/nusoap/ The primary support for NuSOAP is the mailing list: [email protected] */ if (!defined('W3TC')) { die(); } /** * caches instances of the wsdl class * * @author Scott Nichol <[email protected]> * @author Ingo Fischer <[email protected]> * @version $Id: class.wsdlcache.php,v 1.7 2007/04/17 16:34:03 snichol Exp $ * @access public */ class nusoap_wsdlcache { /** * @var resource * @access private */ var $fplock; /** * @var integer * @access private */ var $cache_lifetime; /** * @var string * @access private */ var $cache_dir; /** * @var string * @access public */ var $debug_str = ''; /** * constructor * * @param string $cache_dir directory for cache-files * @param integer $cache_lifetime lifetime for caching-files in seconds or 0 for unlimited * @access public */ function __construct($cache_dir='.', $cache_lifetime=0) { $this->fplock = array(); $this->cache_dir = $cache_dir != '' ? $cache_dir : '.'; $this->cache_lifetime = $cache_lifetime; } /** * creates the filename used to cache a wsdl instance * * @param string $wsdl The URL of the wsdl instance * @return string The filename used to cache the instance * @access private */ function createFilename($wsdl) { return $this->cache_dir.'/wsdlcache-' . md5($wsdl); } /** * adds debug data to the class level debug string * * @param string $string debug data * @access private */ function debug($string){ $this->debug_str .= get_class($this).": $string\n"; } /** * gets a wsdl instance from the cache * * @param string $wsdl The URL of the wsdl instance * @return object wsdl The cached wsdl instance, null if the instance is not in the cache * @access public */ function get($wsdl) { $filename = $this->createFilename($wsdl); if ($this->obtainMutex($filename, "r")) { // check for expired WSDL that must be removed from the cache if ($this->cache_lifetime > 0) { if (file_exists($filename) && (time() - filemtime($filename) > $this->cache_lifetime)) { unlink($filename); $this->debug("Expired $wsdl ($filename) from cache"); $this->releaseMutex($filename); return null; } } // see what there is to return if (!file_exists($filename)) { $this->debug("$wsdl ($filename) not in cache (1)"); $this->releaseMutex($filename); return null; } $fp = @fopen($filename, "r"); if ($fp) { $s = implode("", @file($filename)); fclose($fp); $this->debug("Got $wsdl ($filename) from cache"); } else { $s = null; $this->debug("$wsdl ($filename) not in cache (2)"); } $this->releaseMutex($filename); return (!is_null($s)) ? unserialize($s) : null; } else { $this->debug("Unable to obtain mutex for $filename in get"); } return null; } /** * obtains the local mutex * * @param string $filename The Filename of the Cache to lock * @param string $mode The open-mode ("r" or "w") or the file - affects lock-mode * @return boolean Lock successfully obtained ?! * @access private */ function obtainMutex($filename, $mode) { if (isset($this->fplock[md5($filename)])) { $this->debug("Lock for $filename already exists"); return false; } $this->fplock[md5($filename)] = fopen($filename.".lock", "w"); if ($mode == "r") { return flock($this->fplock[md5($filename)], LOCK_SH); } else { return flock($this->fplock[md5($filename)], LOCK_EX); } } /** * adds a wsdl instance to the cache * * @param object wsdl $wsdl_instance The wsdl instance to add * @return boolean WSDL successfully cached * @access public */ function put($wsdl_instance) { $filename = $this->createFilename($wsdl_instance->wsdl); $s = serialize($wsdl_instance); if ($this->obtainMutex($filename, "w")) { $fp = fopen($filename, "w"); if (! $fp) { $this->debug("Cannot write $wsdl_instance->wsdl ($filename) in cache"); $this->releaseMutex($filename); return false; } fputs($fp, $s); fclose($fp); $this->debug("Put $wsdl_instance->wsdl ($filename) in cache"); $this->releaseMutex($filename); return true; } else { $this->debug("Unable to obtain mutex for $filename in put"); } return false; } /** * releases the local mutex * * @param string $filename The Filename of the Cache to lock * @return boolean Lock successfully released * @access private */ function releaseMutex($filename) { $ret = flock($this->fplock[md5($filename)], LOCK_UN); fclose($this->fplock[md5($filename)]); unset($this->fplock[md5($filename)]); if (! $ret) { $this->debug("Not able to release lock for $filename"); } return $ret; } /** * removes a wsdl instance from the cache * * @param string $wsdl The URL of the wsdl instance * @return boolean Whether there was an instance to remove * @access public */ function remove($wsdl) { $filename = $this->createFilename($wsdl); if (!file_exists($filename)) { $this->debug("$wsdl ($filename) not in cache to be removed"); return false; } // ignore errors obtaining mutex $this->obtainMutex($filename, "w"); $ret = unlink($filename); $this->debug("Removed ($ret) $wsdl ($filename) from cache"); $this->releaseMutex($filename); return $ret; } } /** * For backward compatibility */ class wsdlcache extends nusoap_wsdlcache { }