1 files changed, 47 insertions, 0 deletions
diff --git a/www/wiki/includes/deferred/MWCallableUpdate.php b/www/wiki/includes/deferred/MWCallableUpdate.php
new file mode 100644
index 00000000..9803b7a4
--- /dev/null
+++ b/www/wiki/includes/deferred/MWCallableUpdate.php
@@ -0,0 +1,47 @@
+<?php
+
+use Wikimedia\Rdbms\IDatabase;
+
+/**
+ * Deferrable Update for closure/callback
+ */
+class MWCallableUpdate implements DeferrableUpdate, DeferrableCallback {
+	/** @var callable|null */
+	private $callback;
+	/** @var string */
+	private $fname;
+
+	/**
+	 * @param callable $callback
+	 * @param string $fname Calling method
+	 * @param IDatabase|IDatabase[]|null $dbws Abort if any of the specified DB handles have
+	 *   a currently pending transaction which later gets rolled back [optional] (since 1.28)
+	 */
+	public function __construct( callable $callback, $fname = 'unknown', $dbws = [] ) {
+		$this->callback = $callback;
+		$this->fname = $fname;
+
+		$dbws = is_array( $dbws ) ? $dbws : [ $dbws ];
+		foreach ( $dbws as $dbw ) {
+			if ( $dbw && $dbw->trxLevel() ) {
+				$dbw->onTransactionResolution( [ $this, 'cancelOnRollback' ], $fname );
+			}
+		}
+	}
+
+	public function doUpdate() {
+		if ( $this->callback ) {
+			call_user_func( $this->callback );
+		}
+	}
+
+	public function cancelOnRollback( $trigger ) {
+		if ( $trigger === IDatabase::TRIGGER_ROLLBACK ) {
+			$this->callback = null;
+		}
+	}
+
+	public function getOrigin() {
+		return $this->fname;
+	}
+}