1 files changed, 31 insertions, 0 deletions
diff --git a/azure/aria/aria-extension-cloudify/src/aria/aria/modeling/constraints.py b/azure/aria/aria-extension-cloudify/src/aria/aria/modeling/constraints.py
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+++ b/azure/aria/aria-extension-cloudify/src/aria/aria/modeling/constraints.py
@@ -0,0 +1,31 @@
+# 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.
+
+"""
+Constraints for the requirements-and-capabilities matching mechanism.
+"""
+
+class NodeTemplateConstraint(object):
+    """
+    Used to constrain requirements for node templates.
+
+    Must be serializable.
+    """
+
+    def matches(self, source_node_template, target_node_template):
+        """
+        Returns ``True`` if the target matches the constraint for the source.
+        """
+        raise NotImplementedError