Github user AviaE commented on a diff in the pull request:
https://github.com/apache/incubator-ariatosca/pull/189#discussion_r130595794
--- Diff: aria/orchestrator/topology/common.py ---
@@ -0,0 +1,52 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+
+
+class _Handler(object):
+ def __init__(self, topology, template):
+ self._topology = topology
+ self._model = template
+
+ def _coerce(self, *templates, **kwargs):
+ for template in templates:
+ self._topology.coerce(template)
+
+ def coerce(self):
+ pass
+
+ def validate(self, **kwargs):
+ pass
+
+ def _validate(self, *templates, **kwargs):
+ for template in templates:
+ self._topology.validate(template)
+
+ def dump(self, out_stream):
+ pass
+
+
+class _TemplateHandlerMixin(_Handler):
+
+ def instantiate(self, instance_cls):
+ raise NotImplementedError
+
+
+class _InstanceHandlerMixin(_Handler):
+ pass
+
+
+class _OperatorHolderHandlerMixin(_Handler):
--- End diff --
`OperationHolderHandlerMixin`, and please think of a better word than
`Holder`.
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