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@startuml
skinparam maxMessageSize 100
"AMQP Bus" -> "Decision Engine" : trigger audit
activate "Decision Engine"
"Decision Engine" -> "Database" : update audit.state = ONGOING
"AMQP Bus" <[#blue]- "Decision Engine" : notify new audit state = ONGOING
"Decision Engine" -> "Database" : get audit parameters (goal, strategy, ...)
"Decision Engine" <-- "Database" : audit parameters (goal, strategy, ...)
"Decision Engine" --> "Decision Engine"\
: select appropriate optimization strategy (via the Strategy Selector)
create Strategy
"Decision Engine" -> "Strategy" : execute strategy
activate "Strategy"
"Strategy" -> "Cluster Data Model Collector" : get cluster data model
"Cluster Data Model Collector" --> "Strategy"\
: copy of the in-memory cluster data model
loop while enough history data for the strategy
"Strategy" -> "Ceilometer API" : get necessary metrics
"Strategy" <-- "Ceilometer API" : aggregated metrics
end
"Strategy" -> "Strategy"\
: compute/set needed actions for the solution so it achieves its goal
"Strategy" -> "Strategy" : compute/set efficacy indicators for the solution
"Strategy" -> "Strategy" : compute/set the solution global efficacy
"Decision Engine" <-- "Strategy"\
: solution (unordered actions, efficacy indicators and global efficacy)
deactivate "Strategy"
create "Planner"
"Decision Engine" -> "Planner" : load actions scheduler
"Planner" --> "Decision Engine" : planner plugin
"Decision Engine" -> "Planner" : schedule actions
activate "Planner"
"Planner" -> "Planner"\
: schedule actions according to scheduling rules/policies
"Decision Engine" <-- "Planner" : new action plan
deactivate "Planner"
"Decision Engine" -> "Database" : save new action plan in database
"Decision Engine" -> "Database" : update audit.state = SUCCEEDED
"AMQP Bus" <[#blue]- "Decision Engine" : notify new audit state = SUCCEEDED
deactivate "Decision Engine"
hnote over "Decision Engine" : Idle
@enduml
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