o2app/adapter/unit_of_work.py

   1 # Copyright (C) 2021 Wind River Systems, Inc.\r
   2 #\r
   3 #  Licensed under the Apache License, Version 2.0 (the "License");\r
   4 #  you may not use this file except in compliance with the License.\r
   5 #  You may obtain a copy of the License at\r
   6 #\r
   7 #      http://www.apache.org/licenses/LICENSE-2.0\r
   8 #\r
   9 #  Unless required by applicable law or agreed to in writing, software\r
  10 #  distributed under the License is distributed on an "AS IS" BASIS,\r
  11 #  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
  12 #  See the License for the specific language governing permissions and\r
  13 #  limitations under the License.\r
  14 \r
  15 # pylint: disable=attribute-defined-outside-init\r
  16 from __future__ import annotations\r
  17 from sqlalchemy import create_engine\r
  18 from sqlalchemy.orm import sessionmaker\r
  19 from sqlalchemy.orm.session import Session\r
  20 \r
  21 from o2common.config import config\r
  22 from o2common.service.unit_of_work import AbstractUnitOfWork\r
  23 \r
  24 from o2ims.adapter import ocloud_repository\r
  25 from o2dms.adapter import dms_repository\r
  26 \r
  27 DEFAULT_SESSION_FACTORY = sessionmaker(\r
  28     bind=create_engine(\r
  29         config.get_postgres_uri(),\r
  30         isolation_level="REPEATABLE READ",\r
  31     )\r
  32 )\r
  33 \r
  34 \r
  35 class SqlAlchemyUnitOfWork(AbstractUnitOfWork):\r
  36     def __init__(self, session_factory=DEFAULT_SESSION_FACTORY):\r
  37         self.session_factory = session_factory\r
  38 \r
  39     def __enter__(self):\r
  40         self.session = self.session_factory()  # type: Session\r
  41         self.oclouds = ocloud_repository\\r
  42             .OcloudSqlAlchemyRepository(self.session)\r
  43         self.resource_types = ocloud_repository\\r
  44             .ResouceTypeSqlAlchemyRepository(self.session)\r
  45         self.resource_pools = ocloud_repository\\r
  46             .ResourcePoolSqlAlchemyRepository(self.session)\r
  47         self.resources = ocloud_repository\\r
  48             .ResourceSqlAlchemyRepository(self.session)\r
  49         self.deployment_managers = ocloud_repository\\r
  50             .DeploymentManagerSqlAlchemyRepository(self.session)\r
  51         self.nfdeployment_descs = dms_repository\\r
  52             .NfDeploymentDescSqlAlchemyRepository(self.session)\r
  53         return super().__enter__()\r
  54 \r
  55     def __exit__(self, *args):\r
  56         super().__exit__(*args)\r
  57         self.session.close()\r
  58 \r
  59     def _commit(self):\r
  60         self.session.commit()\r
  61 \r
  62     def rollback(self):\r
  63         self.session.rollback()\r
  64 \r
  65     def _collect_new_events(self):\r
  66         for entry in self.oclouds.seen:\r
  67             while entry.events:\r
  68                 yield entry.events.pop(0)\r
  69         for entry in self.resource_pools.seen:\r
  70             while entry.events:\r
  71                 yield entry.events.pop(0)\r
  72         for entry in self.resources.seen:\r
  73             while entry.events:\r
  74                 yield entry.events.pop(0)\r
  75         for entry in self.resource_types.seen:\r
  76             while entry.events:\r
  77                 yield entry.events.pop(0)\r
  78         for entry in self.deployment_managers.seen:\r
  79             while entry.events:\r
  80                 yield entry.events.pop(0)\r
  81         for entry in self.nfdeployment_descs.seen:\r
  82             while entry.events:\r
  83                 yield entry.events.pop(0)\r