function ChainedFastBackend::markAsOutdated

Marks the fast cache bin as outdated because of a write.

File

core/lib/Drupal/Core/Cache/ChainedFastBackend.php, line 290

Class

ChainedFastBackend

Defines a backend with a fast and a consistent backend chain.

Namespace

Code

protected function markAsOutdated() {
    // Clocks on a single server can drift. Multiple servers may have slightly
    // differing opinions about the current time. Given that, do not assume
    // 'now' on this server is always later than our stored timestamp.
    // Also add 1 millisecond, to ensure that caches written earlier in the same
    // millisecond are invalidated. It is possible that caches will be later in
    // the same millisecond and are then incorrectly invalidated, but that only
    // costs one additional roundtrip to the persistent cache.
    $now = round(microtime(TRUE) + 0.001, 3);
    if ($now > $this->getLastWriteTimestamp()) {
        $this->lastWriteTimestamp = $now;
        $this->consistentBackend
            ->set(self::LAST_WRITE_TIMESTAMP_PREFIX . $this->bin, $this->lastWriteTimestamp);
    }
}