function serveCacheIfNecessary()
{
nitroEnableSession();
if (passesPageCacheValidation() == false) {
return false;
}
$nitrocache_time = getPageCacheTime();
$cachefile = NITRO_PAGECACHE_FOLDER . generateNameOfCacheFile();
if (file_exists($cachefile) && time() - $nitrocache_time < filemtime($cachefile)) {
$cache_filemtime = filemtime($cachefile);
$quick_refresh_file = getQuickCacheRefreshFilename();
if (file_exists($quick_refresh_file)) {
if (filemtime($quick_refresh_file) > $cache_filemtime) {
return false;
}
}
$before = microtime(true);
usleep(1);
header('Content-type: text/html; charset=utf-8');
serveBrowserCacheHeadersIfNecessary($cache_filemtime);
serveSpecialHeadersIfNecessary($cache_filemtime);
if (loadGzipHeadersIfNecessary()) {
$cachefile = $cachefile . '.gz';
}
readfile($cachefile);
$after = microtime(true);
nitroEnableSession();
$_SESSION['NitroRenderTime'] = $after - $before;
$_SESSION['NitroNameOfCacheFile'] = generateNameOfCacheFile();
exit;
}
}
private function quickClearPageCache()
{
$filename = getQuickCacheRefreshFilename();
return touch($filename);
}