ThreadPreloaderService.php

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<?php

namespace Elgg\Comments;

use Elgg\Database\Clauses\OrderByClause;

class ThreadPreloaderService {

    protected $children;
    
    public function preloadThreads(array $comments): void {
        if (empty($comments)) {
            return;
        }
            
        $this->children = [];
        
        $guids = [];
        $container_guid = 0;
        foreach ($comments as $comment) {
            $guids[] = $comment->guid;
            $container_guid = $comment->container_guid;
        }
        
        $batch = elgg_get_entities([
            'type' => 'object',
            'subtype' => 'comment',
            'limit' => false,
            'batch' => true,
            'container_guid' => $container_guid,
            'metadata_name_value_pairs' => [
                'thread_guid' => $guids,
            ],
            'order_by' => new OrderByClause('e.time_created', 'ASC'),
            'preload_owners' => true,
        ]);
        
        /* @var $comment \ElggComment */
        foreach ($batch as $comment) {
            $parent_guid = (int) $comment->parent_guid;
            if (!isset($this->children[$parent_guid])) {
                $this->children[$parent_guid] = [];
            }
            
            $this->children[$parent_guid][] = $comment;
        }
    }
    
    public function getChildren(int $comment_guid): array {
        if (!isset($this->children)) {
            $comment = get_entity($comment_guid);
            if ($comment instanceof \ElggComment) {
                $this->preloadThreads([$comment->getThreadEntity()]);
            }
        }
        
        return elgg_extract($comment_guid, $this->children, []);
    }
}