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<?php declare(strict_types = 1);
namespace MailPoet\Cache;
if (!defined('ABSPATH')) exit;
use MailPoet\WP\Functions as WPFunctions;
use MailPoetVendor\Carbon\Carbon;
class TransientCache {
public const SUBSCRIBERS_STATISTICS_COUNT_KEY = 'mailpoet_subscribers_statistics_count_cache';
public const SUBSCRIBERS_GLOBAL_STATUS_STATISTICS_COUNT_KEY = 'mailpoet_subscribers_statistics_count_global_status_cache';
/** @var WPFunctions */
private $wp;
public function __construct(
WPFunctions $wp
) {
$this->wp = $wp;
}
public function getItem(string $key, int $id): ?array {
$items = $this->getItems($key);
return $items[$id] ?? null;
}
public function getOldestCreatedAt(string $key): ?\DateTime {
$oldest = $this->getOldestItem($key);
return $oldest['created_at'] ?? null;
}
public function getOldestItem(string $key): ?array {
$items = $this->getItems($key);
$oldest = null;
foreach ($items as $item) {
if ($oldest === null || $item['created_at'] < $oldest['created_at']) {
$oldest = $item;
}
}
return $oldest;
}
public function setItem(string $key, array $item, int $id): void {
$items = $this->getItems($key) ?? [];
$items[$id] = [
'item' => $item,
'created_at' => Carbon::now(),
];
$this->setItems($key, $items);
}
public function invalidateItem(string $key, int $id): void {
$items = $this->getItems($key);
unset($items[$id]);
if (count($items)) {
$this->setItems($key, $items);
} else {
$this->deleteItems($key);
}
}
public function invalidateItems(string $key): void {
$this->deleteItems($key);
}
private function deleteItems(string $key): void {
$this->wp->deleteTransient($key);
}
private function setItems(string $key, array $items): void {
$this->wp->setTransient($key, $items);
}
public function getItems(string $key): array {
return $this->wp->getTransient($key) ?: [];
}
}