function &_getCache($topicId)
{
$cache =& Registry::get('helpTopicCache', true, null);
$locale = PKPHelp::getLocale();
if (!isset($cache[$locale][$topicId])) {
$help =& PKPHelp::getHelp();
$cacheManager =& CacheManager::getManager();
$cache[$locale][$topicId] = $cacheManager->getFileCache('help-topic-' . $locale, $topicId, array($this, '_cacheMiss'));
// Check to see if the cache info is outdated.
$cacheTime = $cache[$locale][$topicId]->getCacheTime();
if ($cacheTime !== null && $cacheTime < filemtime($this->getFilename($topicId))) {
// The cached data is out of date.
$cache[$locale][$topicId]->flush();
}
}
return $cache[$locale][$topicId];
}
