SCacheManager.php5

<?php

abstract class SCacheManager {
    private static $CACHE_LOADED = false;
    private static $fCache = null;

    public static function loadIncludeCache() {
        if(!self::$CACHE_LOADED && SConfig::getDefault('includeCache.enable')) {
            $sn = str_replace(array('/', '~'), array('_', ':'), $_SERVER['SCRIPT_FILENAME']);
            $icPath = SConfig::getDefault('includeCache.path') . '/' . SConfig::getDefault('common.server');
            if(!is_dir($icPath))
                mkdir($icPath, 0755, true);
            $sn = "$icPath/$sn.cache";

            if(file_exists($sn)) {
                $list = file_get_contents("$sn");
                $list = array_unique(explode(" ", $list));
                foreach($list as $fl) {
                    if($fl == "")
                        continue;
                    if(!include_once($fl)) {
                        print "<b>ERROR</b>: Can't include $fl<br />Cache will be regenerated on next run\n";
                        unlink("$sn");
                        // cache will be regenerated on next page load
                        exit;
                    }
                }
            }

            self::$fCache = fopen("$sn", "a");
        }

        self::$CACHE_LOADED = true;
    }

    public static function addToIncludeCache($fileName) {
        if(self::$fCache !== null) {
            fwrite(self::$fCache, " $fileName");
        }
    }

    public static function clearIncludeCache($uri = null, $whichServer = false) {
        if($whichServer === false)
            $whichServer = SConfig::getDefault('common.server');
        else if($whichServer === true) {
            foreach(SConfig::getDefault('scache.servers') as $server)
                self::clearIncludeCache($uri, $server);
            return true;
        }
        else if(!in_array($whichServer, SConfig::getDefault('scache.servers')))
            return false;
        $icPath = SConfig::getDefault('includeCache.path') . '/' . $whichServer;
        if($uri) {
            if($uri === true)
                $sn = str_replace(array('/', '~'), array('_', ':'), $_SERVER['SCRIPT_FILENAME']);
            else
                $sn = str_replace(array('/', '~'), array('_', ':'), $uri);
            $sn = "$icPath/$sn.cache";
            if(file_exists($sn))
                unlink($sn);
        }
        else {
            $files = scandir($icPath);
            foreach($files as $file) {
                if($file != '.' && $file != '..' && is_file("$icPath/$file"))
                    unlink("$icPath/$file");
            }
        }
        return true;
    }

    public static function getIncludeCacheCount($whichServer = false) {
        if($whichServer === false)
            $whichServer = SConfig::getDefault('common.server');
        else if(!in_array($whichServer, SConfig::getDefault('scache.servers')))
            return false;

        $icPath = SConfig::getDefault('includeCache.path') . '/' . $whichServer;
        return count(scandir($icPath)) - 2;
    }

    public static function getIncludeCacheEntries($whichServer = false) {
        if($whichServer === false)
            $whichServer = SConfig::getDefault('common.server');
        else if(!in_array($whichServer, SConfig::getDefault('scache.servers')))
            return false;

        $icPath = SConfig::getDefault('includeCache.path') . '/' . $whichServer;
        $entries = array();
        $raw = scandir($icPath);
        foreach($raw as $file) {
            if($file == '.' || $file == '..')
                continue;
            $entries[] = substr(str_replace(array('_', ':'), array('/', '~'), $file), 0, -6);
        }
        return $entries;
    }

    public static function addToPageCache($page) {
        $pcPath = SConfig::getDefault('pageCache.path') . '/' . SConfig::getDefault('common.server');
        if(!is_dir($pcPath))
            mkdir($pcPath, 0755, true);
        $uri = ($_SERVER['REQUEST_URI']);
        $content = $page->getPage();
        $filename = $pcPath . '/' . str_replace(array('/', '~'), array('_', ':'), $uri);
        file_put_contents($filename, $content);
    }

    public static function checkPageCache($uri = null) {
        $pcPath = SConfig::getDefault('pageCache.path') . '/' . SConfig::getDefault('common.server');
        $uri = $uri ? $uri : $_SERVER['REQUEST_URI'];

        $filename = $pcPath . '/' . str_replace(array('/', '~'), array('_', ':'), $uri);

        if (file_exists($filename))
            return $filename;
        else
            return false;
    }

    public static function clearPageCache($uri = null, $whichServer = false) {
        if($whichServer === false)
            $whichServer = SConfig::getDefault('common.server');
        else if($whichServer === true) {
            foreach(SConfig::getDefault('scache.servers') as $server)
                self::clearPageCache($uri, $server);
            return true;
        }
        else if(!in_array($whichServer, SConfig::getDefault('scache.servers')))
            return false;
        $pcPath = SConfig::getDefault('pageCache.path') . '/' . $whichServer;
        if($uri) {
            if($uri === true)
                $uri = $_SERVER['REQUEST_URI'];
            $filename = $pcPath . '/' . str_replace(array('/', '~'), array('_', ':'), $uri);
            unlink($filename);
        }
        else {
            $filepaths = scandir($pcPath);
            foreach($filepaths as $rmfile) {
                if(is_file("$pcPath/$rmfile")) {
                    unlink("$pcPath/$rmfile");
                }
            }
        }
        return true;
    }

    public static function getPageCacheCount($whichServer = false) {
        if($whichServer === false)
            $whichServer = SConfig::getDefault('common.server');
        else if(!in_array($whichServer, SConfig::getDefault('scache.servers')))
            return false;

        $pcPath = SConfig::getDefault('pageCache.path') . '/' . $whichServer;
        return count(scandir($pcPath)) - 2;
    }

    public static function getPageCacheEntries($whichServer = false) {
        if($whichServer === false)
            $whichServer = SConfig::getDefault('common.server');
        else if(!in_array($whichServer, SConfig::getDefault('scache.servers')))
            return false;

        $icPath = SConfig::getDefault('pageCache.path') . '/' . $whichServer;
        $entries = array();
        $raw = scandir($icPath);
        foreach($raw as $file) {
            if($file == '.' || $file == '..')
                continue;
            $entries[] = str_replace(array('_', ':'), array('/', '~'), $file);
        }
        return $entries;
    }

    public static function clearAPC() {
        if(function_exists('apc_clear_cache'))
            apc_clear_cache('system');
    }

    public static function getAPCEntries() {
        if(!function_exists('apc_cache_info'))
            return false;
        $info = apc_cache_info('system');
        $out = array();
        foreach($info['cache_list'] as $entry) {
            $out[] = $entry['filename'];
        }
        return $out;
    }

    public static function clearAllServers($whichCache) {
        if($whichCache != 'includeCache' && $whichCache != 'pageCache')
            return;
        // this assumes that the page cache lives in /var/www/html/media/pageCache/*
        $dirs = scandir("/var/www/html/$whichCache");
        foreach($dirs as $dir) {
            if($dir == '.' || $dir == '..')
                continue;
            $files = scandir("/var/www/html/$whichCache/$dir");
            foreach($files as $file) {
                if($file == '.' || $file == '..')
                    continue;
                unlink("/var/www/html/$whichCache/$dir/$file");
            }
        }
    }
}

?>

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