/**
* {@inheritDoc}
*/
public function __invoke(CachePoolInterface $cache, $stage, CacheItemInterface $item = null)
{
if ($item instanceof CacheItemInterface && $item->isHit()) {
// time left
$left = $item->getExpiration()->getTimestamp() - time();
if ($left < $this->time_left && rand(1, $this->divisor) <= $this->probability) {
// log message
$cache->log('notice', Message::get(Message::CACHE_STAMPEDE_EXT, $item->getKey()));
// revert to miss
return $item->setHit(false);
}
}
return true;
}
/**
* {@inheritDoc}
*/
public function __invoke(CachePoolInterface $cache, $stage, CacheItemInterface $item = null)
{
// distribution
$dis = $this->distribution;
if ($item instanceof CacheItemInterface) {
// expire ttl
$ttl = $item->getExpiration()->getTimestamp() - time();
// percentage
$percent = (rand(0, $dis * 2) - $dis) * 0.001;
// new expire ttl
$new_ttl = (int) round($ttl + $ttl * $percent);
$item->expiresAfter($new_ttl);
}
return true;
}
/**
* {@inheritDoc}
*/
public function save(CacheItemInterface $item)
{
$key = $item->getKey();
$file = $this->getPath($key);
// make sure directory exits
$dir = dirname($file);
if (!is_dir($dir) && !mkdir($dir, 0777, true)) {
return $this->falseAndSetError(Message::get(Message::CACHE_FAIL_MKDIR, $dir), Message::CACHE_FAIL_MKDIR);
}
// write to file
if (($tmp = tempnam($dir, 'temp_')) === false || file_put_contents($tmp, $item->get()) === false) {
return $this->falseAndSetError(Message::get(Message::CACHE_FAIL_WRITEFILE, $key), Message::CACHE_FAIL_WRITEFILE);
}
chmod($tmp, 0640);
// rename to $file
if (rename($tmp, $file) === false) {
return $this->falseAndSetError(Message::get(Message::CACHE_FAIL_WRITEFILE, $file), Message::CACHE_FAIL_WRITEFILE);
}
// set expire time
touch($file, $item->getExpiration()->getTimestamp());
return true;
}
