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<?php
/**
* 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 */
private $callback;
* @param IDatabase $dbw
* @param string $fname Caller name (usually __METHOD__)
* @param callable $callback
* @see IDatabase::doAtomicSection()
public function __construct( IDatabase $dbw, $fname, callable $callback ) {
$this->dbw = $dbw;
$this->fname = $fname;
$this->callback = $callback;
if ( $this->dbw->trxLevel() ) {
$this->dbw->onTransactionResolution( [ $this, 'cancelOnRollback' ] );
}
public function doUpdate() {
if ( $this->callback ) {
$this->dbw->doAtomicSection( $this->fname, $this->callback );
public function cancelOnRollback( $trigger ) {
if ( $trigger === IDatabase::TRIGGER_ROLLBACK ) {
$this->callback = null;
public function getOrigin() {
return $this->fname;
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