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Extract historian into a runtime-loaded plugin so hosts without the Wonderware SDK can run with Historian.Enabled=false

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The aahClientManaged SDK is now isolated in ZB.MOM.WW.LmxOpcUa.Historian.Aveva and loaded via HistorianPluginLoader from a Historian/ subfolder only when enabled, removing the SDK from Host's compile-time and deploy-time surface.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Joseph Doherty
2026-04-12 15:16:07 -04:00
parent 9e1a180ce3
commit 9b42b61eb6
40 changed files with 739 additions and 15855 deletions
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docs/Configuration.md
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@@ -232,7 +232,7 @@ Example — two-instance redundant pair (Primary):
Three boolean properties act as feature flags that control optional subsystems:
- **`OpcUa.AlarmTrackingEnabled`** -- When `true`, the node manager creates `AlarmConditionState` nodes for alarm attributes and monitors `InAlarm` transitions. Disabled by default because alarm tracking adds per-attribute overhead.
- **`Historian.Enabled`** -- When `true`, the service creates a `HistorianDataSource` connected to the Wonderware Historian via the aahClientManaged SDK and registers it with the OPC UA server host. Disabled by default because not all deployments have a Historian instance.
- **`Historian.Enabled`** -- When `true`, the service calls `HistorianPluginLoader.TryLoad(config)` to load the `ZB.MOM.WW.LmxOpcUa.Historian.Aveva` plugin from the `Historian/` subfolder next to the host exe and registers the resulting `IHistorianDataSource` with the OPC UA server host. Disabled by default because not all deployments have a Historian instance -- when disabled the plugin is not probed and the Wonderware SDK DLLs are not required on the host. If the flag is `true` but the plugin or its SDK dependencies cannot be loaded, the server still starts and every history read returns `BadHistoryOperationUnsupported` with a warning in the log.
- **`GalaxyRepository.ExtendedAttributes`** -- When `true`, the repository loads additional Galaxy attribute metadata beyond the core set needed for the address space. Disabled by default to minimize startup query time.
## Configuration Validation