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# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
#
# Licensed 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
import os
import threading
_json_path = os.path.join(
os.path.dirname(os.path.realpath(__file__)), 'constructors.json')
_class_mapping = None
_class_mapping_lock = threading.Lock()
def get_constructor_mapping():
global _class_mapping
if _class_mapping is not None:
return _class_mapping.copy()
with _class_mapping_lock:
if _class_mapping is not None:
return _class_mapping.copy()
tmp_class_mapping = {}
with open(_json_path, 'r') as json_file:
tmp_class_mapping.update(json.load(json_file))
_class_mapping = tmp_class_mapping
return tmp_class_mapping.copy()
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