/**
* Checks whether the given source is fresh, meaning it doesn't need revisiting right now.
*
* @param SourceInterface $source
*
* @return bool
*/
protected function isFresh(SourceInterface $source)
{
$lastVisitDate = $source->getDatetimeLastVisited();
// no previous visit date, consider it stale
if (null === $lastVisitDate) {
return false;
}
$revisitDate = clone $lastVisitDate;
$revisitDate->modify(sprintf('+%d hours', $source->getScraper()->getRevisitFrequency()));
return $revisitDate > new \DateTime();
}
/**
* Adds source to the internal cache.
*
* @param SourceInterface $source
*/
protected function cache(SourceInterface $source = null)
{
if (null === $source) {
return;
}
// mark as visited
$source->setDatetimeLastVisited(new \DateTime());
// cache by id
if ($source->getId()) {
$this->sources[$source->getId()] = $source;
}
$hash = null;
if (null !== ($feed = $source->getFeed())) {
$hash = $this->getFeedHash($feed);
} elseif (null !== ($scraper = $source->getScraper())) {
$hash = $this->getScraperHash($scraper);
}
// must have hash and original id
if (!$hash || !$source->getOriginalId()) {
return;
}
$this->originSources[$hash][$source->getOriginalId()] = $source;
}
