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<?php
/**
* caches instances of the wsdl class
*
* @author Scott Nichol <snichol@computer.org>
* @author Ingo Fischer <ingo@apollon.de>
* @version $Id: class.wsdlcache.php,v 1.5 2005/05/20 17:58:17 snichol Exp $
* @access public
*/
class 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 $cache_lifetime lifetime for caching-files in seconds or 0 for unlimited
* @access public
*/
function wsdlcache($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
$fp = @fopen($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");
}
$this->releaseMutex($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");
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);
// ignore errors obtaining mutex
$this->obtainMutex($filename, "w");
$ret = unlink($filename);
$this->debug("Removed ($ret) $wsdl ($filename) from cache");
$this->releaseMutex($filename);
return $ret;
}
}
?>
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