MetadataCache.php

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<?php

namespace Elgg\Cache;

use Elgg\Config;
use Elgg\Exceptions\DataFormatException;
use Elgg\Values;

class MetadataCache extends CacheService {
    
    public function __construct(protected Config $config) {
        $flags = CompositeCache::CACHE_RUNTIME;
        
        $this->cache = new CompositeCache('metadata_cache', $this->config, $flags);
    }
    
    public function populateFromEntities(...$guids): ?array {
        try {
            $guids = Values::normalizeGuids($guids);
        } catch (DataFormatException $e) {
            return null;
        }
        
        if (empty($guids)) {
            return null;
        }
        
        $cached_values = [];
        
        foreach ($guids as $i => $guid) {
            $value = $this->cache->load($guid);
            if ($value !== null) {
                $cached_values[$guid] = $value;
                unset($guids[$i]);
            }
        }
        
        if (empty($guids)) {
            return $cached_values;
        }
        
        $data = _elgg_services()->metadataTable->getRowsForGuids($guids);
        
        $values = [];
        foreach ($data as $row) {
            $values[$row->entity_guid][] = $row;
        }
        
        // store always for every guid, even if there is no metadata
        foreach ($guids as $guid) {
            $metadata = elgg_extract($guid, $values, []);
            
            $this->cache->save($guid, $metadata);
            $cached_values[$guid] = $metadata;
        }
        
        return $cached_values;
    }
}