public function expired($key)
{
if ($this->get($key) !== false) {
// returned a value, clearly not yet expired
return false;
}
// a known item, not returned by get, is expired
return array_key_exists($key, $this->items);
} /**
* {@inheritdoc}
*/
public function getMulti(array $keys, array &$tokens = null)
{
// retrieve all that we can from local cache
$values = $this->local->getMulti($keys);
$tokens = array();
// short-circuit reading from real cache if we have an uncommitted flush
if (!$this->suspend) {
// figure out which missing key we need to get from real cache
$keys = array_diff($keys, array_keys($values));
foreach ($keys as $i => $key) {
// don't reach out to real cache for keys that are about to be gone
if ($this->local->expired($key)) {
unset($keys[$i]);
}
}
// fetch missing values from real cache
if ($keys) {
$missing = $this->cache->getMulti($keys);
$values += $missing;
}
}
// any tokens we get will be unreliable, so generate some replacements
// (more elaborate explanation in get())
foreach ($values as $key => $value) {
$token = uniqid();
$tokens[$key] = $token;
$this->tokens[$token] = serialize($value);
}
return $values;
}