--- /dev/null
+# Copyright (C) 2021 Wind River Systems, Inc.
+#
+# 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 abc
+from typing import List, Set
+from o2ims.domain import subscription_obj as subobj
+
+
+class SubscriptionRepository(abc.ABC):
+ def __init__(self):
+ self.seen = set() # type: Set[subobj.Subscription]
+
+ def add(self, subscription: subobj.Subscription):
+ self._add(subscription)
+ self.seen.add(subscription)
+
+ def get(self, subscription_id) -> subobj.Subscription:
+ subscription = self._get(subscription_id)
+ if subscription:
+ self.seen.add(subscription)
+ return subscription
+
+ def list(self) -> List[subobj.Subscription]:
+ return self._list()
+
+ def update(self, subscription: subobj.Subscription):
+ self._update(subscription)
+
+ def delete(self, subscription_id):
+ self._delete(subscription_id)
+
+ @abc.abstractmethod
+ def _add(self, subscription: subobj.Subscription):
+ raise NotImplementedError
+
+ @abc.abstractmethod
+ def _get(self, subscription_id) -> subobj.Subscription:
+ raise NotImplementedError
+
+ @abc.abstractmethod
+ def _update(self, subscription: subobj.Subscription):
+ raise NotImplementedError
+
+ @abc.abstractmethod
+ def _delete(self, subscription_id):
+ raise NotImplementedError