| #!/usr/bin/env python3 |
| # -*- encoding: utf-8 -*- |
| |
| # 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. |
| |
| '''serializer_helper.py''' |
| |
| import heron.common.src.python.pex_loader as pex_loader |
| |
| from heronpy.api.serializer import PythonSerializer |
| import heronpy.api.api_constants as constants |
| |
| class SerializerHelper(object): |
| """Helper class for getting serializer for component""" |
| @staticmethod |
| def get_serializer(context): |
| """Returns a serializer for a given context""" |
| cluster_config = context.get_cluster_config() |
| serializer_clsname = cluster_config.get(constants.TOPOLOGY_SERIALIZER_CLASSNAME, None) |
| if serializer_clsname is None: |
| return PythonSerializer() |
| else: |
| try: |
| topo_pex_path = context.get_topology_pex_path() |
| pex_loader.load_pex(topo_pex_path) |
| serializer_cls = pex_loader.import_and_get_class(topo_pex_path, serializer_clsname) |
| serializer = serializer_cls() |
| return serializer |
| except Exception as e: |
| raise RuntimeError("Error with loading custom serializer class: %s, with error message: %s" |
| % (serializer_clsname, str(e))) |