1 files changed, 48 insertions, 0 deletions
diff --git a/www/wiki/includes/deferred/AtomicSectionUpdate.php b/www/wiki/includes/deferred/AtomicSectionUpdate.php
new file mode 100644
index 00000000..8b62989b
--- /dev/null
+++ b/www/wiki/includes/deferred/AtomicSectionUpdate.php
@@ -0,0 +1,48 @@
+<?php
+
+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;
+
+	/**
+	 * @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' ], $fname );
+		}
+	}
+
+	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;
+	}
+}