Github user ran-z commented on a diff in the pull request:
https://github.com/apache/incubator-ariatosca/pull/97#discussion_r112088783
--- Diff: aria/orchestrator/exceptions.py ---
@@ -46,3 +46,24 @@ class TaskAbortException(RuntimeError):
Used internally when ctx.task.abort is called
"""
pass
+
+
+class UndeclaredWorkflowError(AriaError):
+ """
+ Raised when attempting to execute an undeclared workflow
+ """
+ pass
+
+
+class ActiveExecutionsError(AriaError):
+ """
+ Raised when attempting to execute a workflow on a service which
already has an active execution
+ """
+ pass
+
+
+class WorkflowImplementationNotFoundError(AriaError):
--- End diff --
this needs to be validated in the parsing stage
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