Tango V10Tango V10

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Acknowledgements
Tango Controls Steering committee
and Kernel developers

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Disclaimer
We are not official Tango Controls representatives →
It is only our view on TangoV10.
Tango V10 design document is an initial draft → the document will be
revisioned after the Kernel meeting, new concepts will be added
Ideas and thoughts → tango-controls/tango-v10-design-doc

Tango V10 Design DocTango V10 Design Doc
current statuscurrent status (v.0.9)(v.0.9)

Quality attributesQuality attributes

Command-Command-
Query-Query-
Responsibility-Responsibility-
SegregationSegregation
(CQRS)(CQRS)

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Tango V9 main questions and queries
● CORBA is deeply integrated into Tango
● Remove CORBA → re-implement CORBA
● Architectural concepts are fine
● Design and implementation is the bottleneck

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Tango V9 main questions and queries
● Quality attributes
● Most of the problems come from design and
implementation
– ZMQ event system
– Polling

What was doneWhat was done

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● Terminology

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● Diagrams

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● Lots of code schemes

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● GitHub issues

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● GitHub skeletal implementation

Ideas for Tango V10Ideas for Tango V10

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● Ideally our goal is a layered architecture
● Event sourcing as a basic idea
● Integrate CQRS into Tango
● Plugins
● CORBA/ZMQ must be hidden below protocol
layer (Adapters)

Gradual improvementsGradual improvements
can be done without major changes tocan be done without major changes to
existing code baseexisting code base

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● High level Tango protocol
– Server start-up/shutdown sequence
– heartbeats exchange independent from events
– health checks
● A number of issues in the repo:
– self-discovery/self-registration
– Starter like functionality embedded into core library
– Points of extension (also cppTango#498)
– ...

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