[Streaming] Fault Tolerance Implementation (#10008)

streaming/python/runtime/command.py

@@ -0,0 +1,30 @@
+class BaseWorkerCmd:
+    """
+    base worker cmd
+    """
+
+    def __init__(self, actor_id):
+        self.from_actor_id = actor_id
+
+
+class WorkerCommitReport(BaseWorkerCmd):
+    """
+    worker commit report
+    """
+
+    def __init__(self, actor_id, commit_checkpoint_id):
+        super().__init__(actor_id)
+        self.commit_checkpoint_id = commit_checkpoint_id
+
+
+class WorkerRollbackRequest(BaseWorkerCmd):
+    """
+    worker rollback request
+    """
+
+    def __init__(self, actor_id, exception_msg):
+        super().__init__(actor_id)
+        self.__exception_msg = exception_msg
+
+    def exception_msg(self):
+        return self.__exception_msg