wikimedia/mediawiki-extensions-Wikibase

<?php

namespace Wikibase\Repo;

use Psr\SimpleCache\CacheInterface;

/**
 * @license GPL-2.0-or-later
 */
class SiteLinkGlobalIdentifiersProvider {

    private const NO_VALUE = false;

    /**
     * @var SiteLinkTargetProvider
     */
    private $siteLinkTargetProvider;

    /**
     * @var CacheInterface
     */
    private $cache;

    /**
     * @param SiteLinkTargetProvider $siteLinkTargetProvider
     * @param CacheInterface $cache
     */
    public function __construct( SiteLinkTargetProvider $siteLinkTargetProvider, CacheInterface $cache ) {
        $this->siteLinkTargetProvider = $siteLinkTargetProvider;
        $this->cache = $cache;
    }

    public function getList( array $groups ): array {
        $cacheKey = 'list.' . implode( '_', $groups );
        $list = $this->cache->get(
            $cacheKey,
            self::NO_VALUE
        );
        if ( $list !== self::NO_VALUE ) {
            return $list;
        }

        $list = $this->siteLinkTargetProvider->getSiteList( $groups )->getGlobalIdentifiers();
        $this->cache->set( $cacheKey, $list, 3600 );
        return $list;
    }

}