function CacheTagsChecksumTrait::getCurrentChecksum

Implements \Drupal\Core\Cache\CacheTagsChecksumInterface::getCurrentChecksum()

File

core/lib/Drupal/Core/Cache/CacheTagsChecksumTrait.php, line 83

Class

CacheTagsChecksumTrait

A trait for cache tag checksum implementations.

Namespace

Code

public function getCurrentChecksum(array $tags) {
    // Any cache writes in this request containing cache tags whose invalidation
    // has been delayed due to an in-progress transaction must not be read by
    // any other request, so use a nonsensical checksum which will cause any
    // written cache items to be ignored.
    if (!empty(array_intersect($tags, $this->delayedTags))) {
        return CacheTagsChecksumInterface::INVALID_CHECKSUM_WHILE_IN_TRANSACTION;
    }
    // Remove tags that were already invalidated during this request from the
    // static caches so that another invalidation can occur later in the same
    // request. Without that, written cache items would not be invalidated
    // correctly.
    foreach ($tags as $tag) {
        unset($this->invalidatedTags[$tag]);
    }
    return $this->calculateChecksum($tags);
}