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Marc Schier
d08d4faec1
# Description Consolidate the complete B01/B02 NodeState memory work into one PR. - Replace eager cold-path NodeState locks with lazy canonical publication and update the event-monitor counter atomically. - Store six design-metadata properties and three security properties in separate lazy private bags while preserving public APIs, null/empty distinctions, masks, copying and existing serialization behavior. - Avoid allocating the ReportEvent scheduling closure when the async-dispatch path is unused. - Retain the logger factory's category logger directly, avoiding a redundant typed wrapper on telemetry initialization. - Keep Variant at 24 bytes while removing eligible outer boxes for QualifiedName, NodeId, NET8+ ByteString and text-only LocalizedText values. - Add reproducible allocation/layout/occupancy fixtures, real registered and monitored populations, reference contracts, generated-consumer coverage and NativeAOT cases. ## Measured allocation changes Matched .NET 10.0.11 x64 observations against the integrated master baseline: | Construction/assignment | Master | This PR | |---|---:|---:| | Bare/minimal object | 824 B | 640 B | | Bare/minimal variable | 1160 B | 976 B | | Variable with both optional groups populated or reset | 1160 B | 1088 B | | Variable with a shared ByteString value | 1192 B | 976 B | Separate paired measurements show: - telemetry initialization: 24 B typed-logger wrapper removed; - eligible QualifiedName, NodeId and ByteString Variant construction: 32 B to 0 B; - eligible text-only LocalizedText Variant construction: 40 B to 0 B; - variable attributes read into caller-provided Variant destinations: 136 B to 0 B. These are runtime-specific per-operation observations, not additive whole-server savings. Optional bags retain their documented populated/high-water premiums and are not reclaimed on reset. ## Reference-storage decision A complete private indexed reference backend and a sorted-traversal alternative were measured, but both changed the existing filtered hash-index enumeration order. They were rejected despite lower memory use. The production reference backend remains unchanged; strengthened ordering, identity, serialization and concurrency contracts are retained. Adaptive small-set storage remains deferred. ## Consolidation This PR now contains all changes from #4451 and the former narrower #4452 branch. Every #4452 changed path was present in #4451; after merging, the #4451 head `836e45226` is a direct ancestor of this branch. #4451 is closed as superseded. Draft #4425 remains unchanged and is also superseded by this consolidated work. ## Review feedback - Removed the standalone Variant storage document and its README entry. - Made the raw NodeId constructor private; the documented internal `GetRawState`/`SetRawState` bridge is explicitly Variant-only and must never become public. - Marked the two 32-thread counter tests non-parallel. - Added 10-second timeouts to the concurrent browse benchmark's main and worker barriers and completion waits. - Migrated the registered-population fixture to the current async `SealAsync` API. All review threads on #4451 and #4452 were replied to with the action and fix commit, then resolved. ## Related issues - Related to #4275. - Supersedes #4425 and #4451. ## Validation - Consolidated Types/Core/Server selection: **1241 passed** on net10.0. - Consolidated Types/Core/Server selection: **1238 passed** on net48. - Focused #4451 feedback selection: **189 passed** on net10.0 and **187 passed** on net48. - Earlier integrated NativeAOT validation passed **163/163** cases across the main, MCP and Historian applications; current PR CI provides the authoritative final merged-source native validation. The first #4452 CI run was blocked by merge conflicts. Seven later jobs completed their tests but encountered a shared artifact-service HTTP 403 while uploading results; no workflow or test was weakened to mask that infrastructure failure. Generated `report.*.json` crash artifacts remain untracked and are not part of this PR. ## Checklist - [ ] I have signed the [CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf) and read the [CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md) doc. - [x] I have added tests that prove the changes and improve coverage. - [x] I have added the necessary current-behavior documentation. - [ ] I have verified that the fresh consolidated CI run introduces no build or analyzer warnings. - [ ] I ran the complete UA.slnx suite locally on net48 and net10.0 with no failures. - [ ] I fixed all failing and flaky CI tests and all CodeQL warnings. - [x] I have addressed all PR feedback received. --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: d2569e2e-7115-4969-bb44-8159e302b450