Add implementation of SDL in python

[ric-plt/sdlpy.git] / ricsdl-package / ricsdl / backend / __init__.py

diff --git a/ricsdl-package/ricsdl/backend/__init__.py b/ricsdl-package/ricsdl/backend/__init__.py
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+++ b/ricsdl-package/ricsdl/backend/__init__.py
@@ -0,0 +1,54 @@
+# Copyright (c) 2019 AT&T Intellectual Property.
+# Copyright (c) 2018-2019 Nokia.
+#
+# 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.
+
+#
+# This source code is part of the near-RT RIC (RAN Intelligent Controller)
+# platform project (RICP).
+#
+
+
+"""Shared Data Layer (SDL) database backend module."""
+
+from importlib import import_module
+
+
+def get_backend_instance(configuration):
+    """
+    Select database backend solution and return and instance of it.
+    For now only Redis backend solution is supported.
+    """
+    backend_name = 'RedisBackend'
+    backend_module_name = 'redis'
+
+    package = __package__ or __name__
+    backend_module = import_module('.' + backend_module_name, package=package)
+    backend_class = getattr(backend_module, backend_name)
+    instance = backend_class(configuration)
+    return instance
+
+
+def get_backend_lock_instance(ns, name, expiration, backend):
+    """
+    Select database backend lock solution and return and instance of it.
+    For now only Redis backend lock solution is supported.
+    """
+    backend_lock_name = 'RedisBackendLock'
+    backend_module_name = 'redis'
+
+    package = __package__ or __name__
+    backend_module = import_module('.' + backend_module_name, package=package)
+    backend_lock_class = getattr(backend_module, backend_lock_name)
+    instance = backend_lock_class(ns, name, expiration, backend)
+    return instance