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<?php
namespace MediaWiki\Deferred;
use Wikimedia\Rdbms\IDatabase;
/**
* Deferrable Update for closure/callback updates via IDatabase::doAtomicSection()
* @since 1.27
*/
class AtomicSectionUpdate implements DeferrableUpdate, DeferrableCallback {
/** @var IDatabase */
private $dbw;
/** @var string */
private $fname;
/** @var callable|null */
private $callback;
/**
* @see IDatabase::doAtomicSection()
* @param IDatabase $dbw DB handle; update aborts if a transaction now this rolls back
* @param string $fname Caller name (usually __METHOD__)
* @param callable $callback
* @param IDatabase[] $conns Cancel the update if a DB transaction is rolled back [optional]
*/
public function __construct( IDatabase $dbw, $fname, callable $callback, array $conns = [] ) {
$this->dbw = $dbw;
$this->fname = $fname;
$this->callback = $callback;
// Register DB connections for which uncommitted changes are related to this update
$conns[] = $dbw;
foreach ( $conns as $conn ) {
if ( $conn->trxLevel() ) {
$conn->onTransactionResolution( [ $this, 'cancelOnRollback' ], $fname );
}
}
}
public function doUpdate() {
if ( $this->callback ) {
$this->dbw->doAtomicSection( $this->fname, $this->callback );
}
}
/**
* @internal This method is public so that it works with onTransactionResolution()
* @param int $trigger
*/
public function cancelOnRollback( $trigger ) {
if ( $trigger === IDatabase::TRIGGER_ROLLBACK ) {
$this->callback = null;
}
}
public function getOrigin() {
return $this->fname;
}
}
/** @deprecated class alias since 1.42 */
class_alias( AtomicSectionUpdate::class, 'AtomicSectionUpdate' );
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