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Author SHA1 Message Date
romanett e49d17d706 [Server] Make MonitoredNode aware of IAsyncNodeManager and introduce channel-based queueing under load (#3804) 
## Proposed changes

This PR updates the server monitored-item pipeline to be
`IAsyncNodeManager`-aware and introduces channel-based FIFO queueing in
the monitored-node path to improve behavior under load.

It also includes follow-up fixes from review/CI feedback:
- Adjusted
`AsyncCustomNodeManagerTests.WriteAsync_PublishesValueToMonitoredItemQueueAsync`
to account for channel-based delivery timing/coalescing while still
asserting the written value is observed.
- Merged latest `master` into this branch and resolved merge conflicts
(notably in `ConfigurationNodeManager`), keeping async address-space
lookup behavior intact.
- Applied small compile-safety corrections needed for successful
validation.
 2026-05-27 10:12:17 +02:00
Marc Schier 889572472f Convert DataValue from class to readonly struct for further GC relief (#3796) 
Convert `DataValue` from a mutable reference type (`class`) to a `readonly struct` to eliminate per-allocation GC pressure on every attribute read, subscription publish, and history sample.

### Key API changes (user-visible)

| Before | After | Pattern |
|---|---|---|
| `class DataValue` | `readonly struct DataValue : INullable` | Foundation |
| `Equals(DataValue?)` / `operator ==(DataValue?, DataValue?)` | `Equals(DataValue)` / `operator ==(DataValue, DataValue)` | Value semantics |
| `IEncoder.WriteDataValue(string?, DataValue?)` | `IEncoder.WriteDataValue(string?, DataValue)` | Non-nullable wire API |
| `IDecoder.ReadDataValue(...) -> DataValue?` | `IDecoder.ReadDataValue(...) -> DataValue` | Same |
| `IDataChangeMonitoredItemQueue.PeekLast/Oldest()` | `TryPeekLastValue/Oldest(out DataValue)` | TryGet pattern |
| `IAggregateCalculator.GetProcessedValue(bool)` | `TryGetProcessedValue(bool, out DataValue)` | Same |
| `IUaPubSubDataStore.ReadPublishedDataItem(...)` | `TryReadPublishedDataItem(NodeId, uint, out DataValue)` | Same |
| `Dictionary<uint, DataValue?>` (NodeCacheContext) | `Dictionary<uint, DataValue>` | Default + IsNull |
| `IHistoryDataSource.FirstRaw/NextRaw` | `TryFirstRaw/TryNextRaw(out DataValue)` | TryGet pattern |
| `NodeState.ReadAttribute(... DataValue)` | `NodeState.ReadAttribute(... ref DataValue)` | Sync mutation via ref |
| `NodeState.ReadAttributeAsync(... DataValue)` | `NodeState.ReadAttributeAsync(...) -> ValueTask<(ServiceResult, DataValue)>` | Async return tuple |
| `obj as DataValue` (heterogeneous Dictionary<string, object>) | `obj is DataValue dv ? dv : default(DataValue)` | Safe struct cast |
| `Assert.That(dv, Is.Not.Null)` (tests) | `Assert.That(dv.IsNull, Is.False)` | Struct test pattern |
| `[Obsolete] Value` setter, all property setters | Removed; use ctor or `With*()` | Immutability |
| `[DataContract]` + `[DataMember]` | Removed; surrogate via `SerializableDataValue` + `DataValueSurrogateProvider` | Serialization |

### Wire format

Wire format is **byte-identical** to the previous class-based implementation across binary / JSON / XML encoders. Default DataValue (`.IsNull == true`) is treated as the equivalent of the old null reference (writes JSON `null`, binary `byte 0`, XML omitted element).

### Why TryGet pattern (instead of leaving `DataValue?`)

For methods that previously returned `DataValue?` to signal "no value available" (queue peek, aggregate result, data store lookup, history navigation), the conversion to `bool TryGet(out DataValue)` matches BCL conventions (`Dictionary.TryGetValue`, `Queue.TryPeek`, `Int32.TryParse`) and gives the caller an explicit "may be absent" affordance without `Nullable<DataValue>` overhead.

### Breaking changes summary

- `DataValue` is now a `readonly struct` - boxing/unboxing semantics change for callers using `object`-typed APIs.
- `IEncoder.WriteDataValue` / `IDecoder.ReadDataValue` / `ReadDataValueArray` interface signatures lose the `Nullable` wrapper.
- `IDataChangeMonitoredItemQueue.PeekLastValue` / `PeekOldestValue` -> `TryPeekLastValue` / `TryPeekOldestValue` (out parameter).
- `IAggregateCalculator.GetProcessedValue` -> `TryGetProcessedValue` (out parameter).
- `IUaPubSubDataStore.ReadPublishedDataItem` -> `TryReadPublishedDataItem` (out parameter).
- `NodeState.ReadAttribute` takes `ref DataValue`; `ReadAttributeAsync` returns `ValueTask<(ServiceResult, DataValue)>`.
- `DataValue` property setters removed (use constructor + `With*` mutators).
 2026-05-23 11:38:49 +02:00
Marc Schier 3e5f129c6f Enable nullable in Stack, Libraries (9), and Applications projects (#3732) 2026-05-17 12:55:24 +02:00
Marc Schier 2960388560 Update headers and license files (#3388) 
Update license headers to copy right year 2025, replace RCL/GPL headers with MIT, replace the nuget license with MIT (via license expression).
 2025-12-04 19:44:40 +01:00
Marc Schier 9830e5d53e Enable roslynizer and fix all analyzer issues (#3157) 
* Fix warnings and suggestions
* Enable roslynator
 2025-08-16 04:10:24 -07:00
romanett 2f0770c569 [Server] Restore durable subscriptions on Server Restart (#3025) 
* Enable Durable Subscriptions (#9)

* [Server] Durable Subscriptions (#2683)

* Implement a system test for DurableSubscriptions (#2839)
* Client Side
Co-authored-by: ALTERNATE-DEV\Archie <archie@dreamsandadventures.ca>

* make a static Method CalculateRevisedQueueSize

* Adress review feedback

* fix FilterRetainTests

* Add MonitoredItem Id to Queues
Use NodeIdDictionary where possible

* first proto

* fix reference server

* implement store

* initialize early

* fix issues

* Move to Reference Server & start implementing queue restore

* Persist queues

* Register queues in factory after restore

* Add Docs

* minor fixes

* Test Subscription Restore & Transfer

* fix Durable Subscription Test Browse

* Fix conversion of extension objects

* use CustomConverter for NumericRange

* Adress review Feedback

* Documentation improvements

* Update Readme

* update sampling group manager to work without session

* remove launch settings
 2025-03-24 11:45:09 +02:00
romanett ef9387b525 Enable Durable Subscriptions (#2978) 
* Enable Durable Subscriptions (#9)

* [Server] Durable Subscriptions (#2683)

* Implement a system test for DurableSubscriptions (#2839)
* Client Side
Co-authored-by: ALTERNATE-DEV\Archie <archie@dreamsandadventures.ca>

* make a static Method CalculateRevisedQueueSize

* Adress review feedback

* fix FilterRetainTests

* Add MonitoredItem Id to Queues
Use NodeIdDictionary where possible
 2025-02-28 13:46:49 +02:00
Martin Regenandmrsuciu 8c1a659ecf Reference Server updates running CTT (#1689) 
- Provide the CTT configuration used for 1.4.9.398: Added tests with arrays except Variant
- Match the Reference server config for CTT run (Console Server was used, others tbd)
- add a few cases in ref server node manager to enable skipped tests
- preset random generators to create deterministic node data 
CTT fixes:
- Trigger: fix a regression introduced with the TransferSubscription support, Trigger stopped working, revert change to remove LinkedList in MonitoredItems
- return BadDataEncodingUnsupported creating MonitoredItems
- ensure that MonitoredItem node data reported as required by CTT after initial reading, transfer and SetMonitoring

note: not yet 100% passy, a few uncritical failing tests are still under investigation

Co-authored-by: mrsuciu <Mircea-Adrian.Suciu@softing.com>
 2022-01-31 13:32:58 +01:00
Martin Regen 14e7c67a5c Add sample node managers to ref server (#1535) 
- add boiler, data and memory buffer sample node managers to reference server
- exclude Quickstarts.Servers from code coverage
 2021-10-15 21:12:04 +02:00