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diff --git a/o2common/service/unit_of_work.py b/o2common/service/unit_of_work.py
new file mode 100644
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+++ b/o2common/service/unit_of_work.py
@@ -0,0 +1,54 @@
+# 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.
+
+# pylint: disable=attribute-defined-outside-init
+from __future__ import annotations
+import abc
+
+from o2ims.domain.ocloud_repo import OcloudRepository,\
+    ResourcePoolRepository, ResourceRepository, ResourceTypeRepository,\
+    DeploymentManagerRepository
+from o2ims.domain.stx_repo import StxObjectRepository
+
+
+class AbstractUnitOfWork(abc.ABC):
+    oclouds: OcloudRepository
+    resource_types: ResourceTypeRepository
+    resource_pools: ResourcePoolRepository
+    resources: ResourceRepository
+    deployment_managers: DeploymentManagerRepository
+    stxobjects: StxObjectRepository
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *args):
+        self.rollback()
+
+    def commit(self):
+        self._commit()
+
+    def collect_new_events(self):
+        return self._collect_new_events()
+
+    def _collect_new_events(self):
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def _commit(self):
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def rollback(self):
+        raise NotImplementedError