wenjin272 commented on code in PR #6:
URL: https://github.com/apache/flink-agents/pull/6#discussion_r2142089245


##########
python/flink_agents/api/event.py:
##########
@@ -0,0 +1,65 @@
+################################################################################
+#  Licensed to the Apache Software Foundation (ASF) under one
+#  or more contributor license agreements.  See the NOTICE file
+#  distributed with this work for additional information
+#  regarding copyright ownership.  The ASF licenses this file
+#  to you under the Apache License, Version 2.0 (the
+#  "License"); you may not use this file except in compliance
+#  with the License.  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+# limitations under the License.
+#################################################################################
+import json
+from abc import ABC
+from typing import Any
+from uuid import UUID, uuid4
+
+from pydantic import BaseModel, Field, model_validator
+
+
+class Event(BaseModel, ABC, extra="allow"):
+    """Base class for all event types in the system. Event allow extra 
properties, but
+    these properties are required isinstance of BaseModel, or json 
serializable.
+
+    Attributes:
+    ----------
+    id : UUID
+        Unique identifier for the event, automatically generated using uuid4.
+    """
+    id: UUID = Field(default_factory=uuid4)
+
+    @model_validator(mode='after')
+    def validate_extra(self) -> 'Event':
+        """Make sure all extra properties are serializable."""
+        for value in self.__pydantic_extra__.values():
+            if isinstance(value, BaseModel):

Review Comment:
   1. Try model_dump_json() to check if any object contains is serializable
   2. Override __setattr__  method to check serializable when add field after 
construct.



##########
python/flink_agents/api/tests/test_event.py:
##########
@@ -0,0 +1,33 @@
+################################################################################
+#  Licensed to the Apache Software Foundation (ASF) under one
+#  or more contributor license agreements.  See the NOTICE file
+#  distributed with this work for additional information
+#  regarding copyright ownership.  The ASF licenses this file
+#  to you under the Apache License, Version 2.0 (the
+#  "License"); you may not use this file except in compliance
+#  with the License.  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+# limitations under the License.
+#################################################################################
+from typing import Type
+
+import pytest
+
+from flink_agents.api.event import Event
+
+
+def test_event_serializable() -> None: #noqa D103

Review Comment:
   Only for passing code style check that public method needs docs string.



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