brian wickman created AURORA-167:
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             Summary: Add on_success and on_failure Constraints to Thermos
                 Key: AURORA-167
                 URL: https://issues.apache.org/jira/browse/AURORA-167
             Project: Aurora
          Issue Type: Task
          Components: Thermos
            Reporter: brian wickman
            Priority: Trivial


Currently there is one supported constraint in Thermos: 'order' or if you think 
of it another way, "on_finish".

Constraint(order = ['A', 'B']) means that 'B' should run after 'A' has 
completed, regardless of its terminal state.  In a way, this could be 
translated to Constraint(on_success = ['A', 'B'], on_failure = ['A', 'B'])

But there shouldn't be anything preventing somebody from doing 
Constraint(on_success = ['A', 'B'], on_failure = ['A', 'C']).  E.g. maybe 
process 'B' sends an e-mail that a deploy was successful, and process 'C' 
starts a rollback process.



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