TableStatsProvider.php

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<?php
 
namespace MediaWiki\RecentChanges\ChangesListQuery;
 
use Wikimedia\Rdbms\IConnectionProvider;
 
class TableStatsProvider {
    private ?int $minId;
    private ?int $maxId;
    private bool $loaded = false;
 
    public function __construct(
        private IConnectionProvider $connectionProvider,
        private string $tableName,
        private string $idField,
    ) {
    }
 
    public function getIdDelta() {
        $this->loadStats();
        return $this->maxId === null ? 0 : $this->maxId - $this->minId;
    }
 
    public function getMinId() {
        $this->loadStats();
        return $this->minId;
    }
 
    public function getMaxId() {
        $this->loadStats();
        return $this->maxId;
    }
 
    private function loadStats() {
        if ( $this->loaded ) {
            return;
        }
        $this->loaded = true;
 
        $info = $this->connectionProvider
            ->getReplicaDatabase()
            ->newSelectQueryBuilder()
            ->select( [
                'min_id' => "MIN({$this->idField})",
                'max_id' => "MAX({$this->idField})",
            ] )
            ->from( $this->tableName )
            ->caller( __METHOD__ )
            ->fetchRow();
        if ( $info ) {
            $this->minId = (int)$info->min_id;
            $this->maxId = (int)$info->max_id;
        }
    }
}