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- The implementation architecture explainsdescribes:
- the components used,
- embedding of components and
- component communication.
- Clustering is explained withdescribed as:
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- Workflow configurations are deployed from the JOC Cockpit to a Controller that forwards them to the connected Agents:
- Agents execute instructions and jobs from a workflow.
- Agents report back execution results and the job log output by returning events.
- Orders are managed by the JOC Cockpit and are submitted to Controllers that forward them to the connected Agents:
- Agents start workflows based on the order's scheduled start time.
- User interventions include canceling, suspending and resuming orders. Such operations are sent by JOC Cockpit to the Controller that forwards them to connected Agents.
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- A Controller Cluster provides automated fail-over between Active and Standby Controller instances.
- Controllers hold a journal for restart capabilities that includes workflow configurations and order state events:
- The JOC Cockpit History Service subscribes to such events to maintain the History and to forward events to the GUI.
- Events are released from by a Controller and the journal shrinks once the History has been persistently stored in the database.
- Controllers and Agents store messages in their journal and pass them asynchronously. This mechanism recovers communication in case of longer outages lasting hours or days.
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