[Streaming] Fault Tolerance Implementation (#10008)

streaming/python/runtime/failover.py

@@ -0,0 +1,30 @@
+class Barrier:
+    """
+    barrier
+    """
+
+    def __init__(self, id):
+        self.id = id
+
+    def __str__(self):
+        return "Barrier [id:%s]" % self.id
+
+
+class OpCheckpointInfo:
+    """
+    operator checkpoint info
+    """
+
+    def __init__(self,
+                 operator_point=None,
+                 input_points=None,
+                 output_points=None,
+                 checkpoint_id=None):
+        if input_points is None:
+            input_points = {}
+        if output_points is None:
+            output_points = {}
+        self.operator_point = operator_point
+        self.input_points = input_points
+        self.output_points = output_points
+        self.checkpoint_id = checkpoint_id