class.wsdlcache.php

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<?php


class wsdlcache
{

	var $fplock;
	var $cache_lifetime;
	var $cache_dir;
	var $debug_str = "";

	function wsdlcache( $cache_dir = ".", $cache_lifetime = 0 )
	{
		$this->fplock = array( );
		$this->cache_dir = $cache_dir != "" ? $cache_dir : ".";
		$this->cache_lifetime = $cache_lifetime;
	}

	function createfilename( $wsdl )
	{
		return $this->cache_dir."/wsdlcache-".md5( $wsdl );
	}

	function debug( $string )
	{
		$this->debug_str .= get_class( $this ).": {$string}\n";
	}

	function get( $wsdl )
	{
		$filename = $this->createfilename( $wsdl );
		if ( $this->obtainmutex( $filename, "r" ) )
		{
			if ( 0 < $this->cache_lifetime )
			{
				if ( file_exists( $filename ) && $this->cache_lifetime < time( ) - filemtime( $filename ) )
				{
					unlink( $filename );
					$this->debug( "Expired {$wsdl} ({$filename}) from cache" );
					$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" );
			}
			$this->releasemutex( $filename );
			return !is_null( $s ) ? unserialize( $s ) : null;
		}
		return null;
	}

	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 );
		}
	}

	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;
		}
		return false;
	}

	function releasemutex( $filename )
	{
		$ret = flock( $this->fplock[md5( $filename )], LOCK_UN );
		fclose( $this->fplock[md5( $filename )] );
		unset( $this->$this->fplock->md5( $filename ) );
		return $ret;
	}

	function remove( $wsdl )
	{
		$filename = $this->createfilename( $wsdl );
		$this->obtainmutex( $filename, "w" );
		$ret = unlink( $filename );
		$this->debug( "Removed {$wsdl} ({$filename}) from cache" );
		$this->releasemutex( $filename );
		return $ret;
	}

}

?>