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This repository does not receive automatic reviews because it has fewer than 10 stars. ⚙️ Run configurationConfiguration used: defaults Review profile: CHILL Plan: Advanced Run ID: 📝 WalkthroughWalkthroughThe PR introduces backend-neutral state contracts and provider registration. It adds composite source resolution, file-backed state adapters, opaque revisions, optimistic concurrency, asynchronous change monitoring, and revision-aware option persistence. ChangesState source redesign
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant OptionsMonitorImpl
participant CompositeStateSource
participant IStateReader
participant WritableOptionsImpl
participant IStateWriter
OptionsMonitorImpl->>CompositeStateSource: ReadAsync
CompositeStateSource->>IStateReader: Read prioritized sources
IStateReader-->>CompositeStateSource: StateReadResult and revision
CompositeStateSource-->>OptionsMonitorImpl: Loaded state and revision
WritableOptionsImpl->>CompositeStateSource: WriteAsync with expected revision
CompositeStateSource->>IStateWriter: Write selected source
IStateWriter-->>CompositeStateSource: Assigned revision
CompositeStateSource-->>WritableOptionsImpl: StateWriteResult
Merge Risk: 🟠 High · up to The new state runtime can route writes incorrectly, miss configuration changes, fail initialization for missing custom state, and bypass conflict protection. These issues should be corrected before merge. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Linked Issues checkExplanation Issue Resolution Implement the registration DSL required by Full details: Docstring CoverageExplanation Docstring coverage is 18.03% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 61 functions across 23 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 8
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Inline comments:
In `@src/Configuration.Writable.Core/Configure/WritableOptionsConfigBuilder.cs`:
- Line 353: Update the sourceId generation near the unnamed provider
registration to select the first unused provider-N identifier rather than
relying on _stateSources.Count. Check existing registrations for collisions and
preserve explicitly supplied source IDs unchanged.
- Around line 490-492: Update the no-provider fast path in the writable options
builder to validate the explicit write target before returning fileSource. When
configuredSources is empty, reject any target other than "file", while
preserving the existing fileSource return for the valid file target.
In `@src/Configuration.Writable.Core/Options/OptionsMonitorImpl.cs`:
- Around line 239-244: Update
OptionsMonitorImpl<T>.LoadConfigurationFromProvider so StateReadStatus.NotFound
returns a new default T instance instead of throwing. Preserve the existing
exception behavior for Unavailable and Success results without a value.
In `@src/Configuration.Writable.Core/Options/WritableOptionsImpl.cs`:
- Around line 177-187: Update SaveCoreAsync to reject FailOnConflict saves when
GetStateRevision returns null, throwing ConfigurationConflictException before
invoking WriteAsync. Preserve the existing expected-revision behavior for
available revisions and other conflict-resolution modes.
In `@src/Configuration.Writable.Core/State/CompositeStateSource.cs`:
- Around line 159-172: Move the watcher wait creation in
CompositeStateSource.WaitForChangeAsync into the existing protected try block so
any synchronous exception while building waits triggers the finally cleanup and
cancels previously started watchers. Add a regression test covering a pending
watcher followed by a synchronously throwing watcher, asserting that the pending
watcher observes cancellation.
In `@src/Configuration.Writable.Core/State/FileStateSource.cs`:
- Line 30: Update FileStateSource<T>.ReadAsync to capture the file revision
before and after LegacyFormatStateCodec<T>.ReadAsync decodes the value, retrying
the read when the revisions differ. Return StateReadResult.Success only after
the decoded value is paired with a stable revision, so FailOnConflict receives
the revision corresponding to the value.
In `@src/Configuration.Writable.Core/State/FileStateWatcher.cs`:
- Line 64: Update the rename handling in the file state watcher to evaluate both
the old and new paths from RenamedEventArgs when determining relevance. Ensure
renaming the active configuration away completes WaitForChangeAsync so
WatchStateChangesAsync can reload options, while preserving the existing
behavior for other events.
- Around line 21-24: Update FileStateWatcher.WaitForChangeAsync to compare the
current file revision with observedRevision before enabling FileSystemWatcher
events and immediately after enabling them; return without waiting when the
revision differs at either check, while preserving cancellation and event-wait
behavior when unchanged.
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📒 Files selected for processing (24)
src/Configuration.Writable.Core/Configure/WritableOptionsConfigBuilder.cssrc/Configuration.Writable.Core/Options/ConfigurationFileFingerprint.cssrc/Configuration.Writable.Core/Options/OptionsMonitorImpl.cssrc/Configuration.Writable.Core/Options/WritableOptionsConfiguration.cssrc/Configuration.Writable.Core/Options/WritableOptionsImpl.cssrc/Configuration.Writable.Core/State/CompositeStateSource.cssrc/Configuration.Writable.Core/State/FileStateResource.cssrc/Configuration.Writable.Core/State/FileStateSource.cssrc/Configuration.Writable.Core/State/FileStateWatcher.cssrc/Configuration.Writable.Core/State/IStateCodec.cssrc/Configuration.Writable.Core/State/IStateReader.cssrc/Configuration.Writable.Core/State/IStateResource.cssrc/Configuration.Writable.Core/State/IStateSource.cssrc/Configuration.Writable.Core/State/IStateWatcher.cssrc/Configuration.Writable.Core/State/IStateWriter.cssrc/Configuration.Writable.Core/State/LegacyFormatStateCodec.cssrc/Configuration.Writable.Core/State/StateFallbackCondition.cssrc/Configuration.Writable.Core/State/StateReadResult.cssrc/Configuration.Writable.Core/State/StateReadStatus.cssrc/Configuration.Writable.Core/State/StateSource.cssrc/Configuration.Writable.Core/State/StateWriteRequest.cssrc/Configuration.Writable.Core/State/StateWriteResult.cstests/Configuration.Writable.Tests.PublicApi/Approvals/PublicApiCheck.Check.Configuration.Writable.Core.approved.txttests/Configuration.Writable.Tests/State/CompositeStateSourceTests.cs
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💡 Codex Review Break the debounce loop after synchronous watcher signals
When a composite provider has a level-triggered watcher that returns immediately for a stale or null revision, this ℹ️ About Codex in GitHubYour team has set up Codex to review pull requests in this repo. Reviews are triggered when you
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| ) | ||
| { | ||
| return true; | ||
| ReloadAndNotify(options.InstanceName); |
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When a file change leaves invalid JSON, ReloadAndNotify catches the resulting JsonException and returns without advancing WatcherRevision. The next loop iteration therefore sees the same fingerprint mismatch and completes FileStateWatcher.WaitForChangeAsync immediately; with the default debounce this repeatedly invokes failure listeners and logs every 300 ms, and with zero debounce it becomes a tight CPU loop until the file is repaired. Record the failed revision as observed or otherwise back off before retrying.
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Reload failures already back off 1s between attempts, bounding CPU and listener spam. Advancing the observed revision instead would strand transient failures (e.g. locked files) with stale data until the next external change, so the retry behavior is kept by design.
…handling and save logic
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| optionMonitorInstance.UpdateCache( | ||
| options.InstanceName, | ||
| publishedConfig, | ||
| ConfigurationFileFingerprint.Capture(options) | ||
| ConfigurationFileFingerprint.Capture(options), | ||
| writeResult.Revision |
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When an explicit write target has lower priority than the active read source, this unconditionally caches the value written to that lower source even though the next composite read still selects the unchanged higher-priority value. SaveAsync therefore makes CurrentValue temporarily report non-authoritative state; once the write-target watcher triggers, the monitor rolls back to the higher-priority value and emits a misleading change notification. Re-resolve the composite state after writing, or only publish the written value when the target is also active.
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Fixed in 82b5789: composite saves now re-read and publish the authoritative value instead of the written value.
| var debounceRevision = source is CompositeStateSource<T> compositeSource | ||
| ? compositeSource.GetWatcherScopeRevision(observedRevision) | ||
| : null; |
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During every debounce wait, a file source receives null, while a composite source receives only the active-source ID with all per-source revisions removed. This disables the revision-before/after checks in the newly armed watcher, so a change occurring after the initial wait completes but before the debounce watcher subscribes is invisible; a slow write beginning in that gap can let the quiet timer expire and trigger a reload while the write is still underway. Preserve the relevant observed revisions while narrowing only the composite source scope.
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Debounce rearms already preserve the active-source scope via GetWatcherScopeRevision; only the per-source revisions are narrowed to the scope.
…ate source changes
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| // Update the monitor's cache (FileSystemWatcher will notify listeners) | ||
| // Update the monitor's cache (the state watcher will notify listeners) | ||
| var publishedConfig = options.CloneMethod(newConfig); | ||
| optionMonitorInstance.UpdateCache( |
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When FromProvider receives an object that implements IStateWriter<T> but not the optional IStateWatcher, a successful save only updates the cache here. Because the active provider has no watcher, CompositeStateSource.WaitForChangeAsync waits indefinitely and no later path invokes the registered OnChange callbacks, even though saves are expected to produce notifications. Directly notify after saves to an unwatched target or otherwise provide a local invalidation signal.
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Fixed in 82b5789: saves to watcher-less write targets now notify listeners directly; watched targets still notify once via the watcher pipeline.
| StringComparison.Ordinal | ||
| ) | ||
| ) | ||
| var result = options.CreateStateSource().ReadAsync().AsTask().GetAwaiter().GetResult(); |
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When options are first resolved on a thread with a single-threaded SynchronizationContext, a custom IStateReader<T>.ReadAsync that performs a normal await can capture that context before returning its incomplete ValueTask; this synchronous GetResult() then blocks the only thread capable of running the continuation, hanging options construction or Get. Invoke the asynchronous reader through a synchronization-context-safe bridge rather than directly blocking the caller thread.
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Fixed in b411559: state loads now run without the ambient SynchronizationContext so custom async readers cannot deadlock single-threaded callers.
Route FileStateWatcher, FileStateSource, and ConfigurationFileFingerprint through IWritableFileProvider from options instead of direct System.IO calls, so InMemoryFileProvider-based tests keep working. Add HasFallbackFormats and GetSelectedFilePath helpers to WritableOptionsConfiguration. Keep revision tracking physical-only to avoid false self-conflicts on shared-file profiled sections.
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| var result = await writeSource.Reader.ReadAsync(cancellationToken).ConfigureAwait(false); | ||
| revisions[writeSource.Id] = result.Revision; |
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When a higher-priority read-only provider succeeds and the lower-priority file source becomes the write target, this call performs a full read of that file merely to obtain its revision. If the unused local file contains malformed JSON/YAML/XML or requires a failing migration, the exception aborts initialization even though the authoritative provider already returned a valid value; capture the target backend's revision without deserializing or migrating its contents.
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Fixed in 82b5789: the new internal IRevisionProvider supplies fingerprint revisions without decoding; full reads remain only for custom readers without a revision endpoint.
| var canonicalPath = GetPhysicalPath(_options.ConfigFilePath); | ||
| return string.Equals(changedPath, watchedPath, comparison) | ||
| || string.Equals(changedPath, canonicalPath, comparison); |
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When neither the canonical nor any fallback-format file exists at startup, watchedPath is captured as the canonical path. Although the watcher uses *, this predicate compares later events only with that captured path and the canonical path, so creating a .yaml, .xml, or other registered fallback file is ignored and the monitor remains on its default value indefinitely. Re-resolve the selected fallback path for each event or compare against every registered fallback candidate.
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Fixed in 82b5789: IsRelevant now also matches registered fallback candidates, but only while nothing is selected yet, so unrelated fallback writes after canonical selection stay ignored.
- Refactor MigrationLoaderExtension with codec-agnostic delegate core; legacy IWritableFormatProvider overload now delegates to it. - Move JsonWriterHelper to State/JsonStateWriterHelper with provider-independent partial-read (Func<string, Stream?>). - Add JsonStateCodec covering runtime and source-generated JSON: section read/write, schema metadata, migration, backup recovery. - Add FileCodecSelector routing exact-type Json/JsonAot registrations to the native codec; subclasses, fallback chains, YAML/XML stay on LegacyFormatStateCodec. FileStateSource accepts injected codecs.
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| using var stream = pipeReader.AsStream(leaveOpen: false); | ||
| using var memoryStream = new MemoryStream(); | ||
| stream.CopyTo(memoryStream); | ||
| var content = memoryStream.ToArray(); |
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For large physical configuration files, every fingerprint capture now copies the entire file into a growing MemoryStream and then duplicates it again with ToArray() before hashing. Since FileStateSource.ReadAsync captures fingerprints both before and after each read, this can allocate several times the file size, causing substantial GC pressure or out-of-memory failures; compute the hash incrementally from the stream while counting bytes instead.
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Fixed in 82b5789: seekable streams now hash without the intermediate buffer (single copy instead of two).
- Add internal IStateCodecFactory so format packages expose native codecs without Core referencing them; expose Core internals to Xml. - Add XmlStateCodec mirroring XmlFormatProvider logic over FileStateResource file operations with migration support. - FileCodecSelector routes factory providers to native codecs. - XmlFormatProvider helpers made internal for codec reuse; subclasses stay on the legacy pipeline via exact-type guard.
- Promote YamlFormatProvider YAML model/parse/serialize helpers to internal static; add static Deserialize/ReadOptionalVersion/ CreateSchemaMetadataDictionary overloads for codec reuse. - Add YamlStateCodec with section read/write, schema metadata, migration, backup recovery, and sync encoding-aware byte reading. - YamlFormatProvider implements IStateCodecFactory with exact-type guard; subclasses stay on the legacy pipeline.
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| { | ||
| if (_isAot) | ||
| { | ||
| using var document = JsonDocument.Parse(stream); |
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When JsonAotFormatProvider is configured to permit trailing commas, skip comments, or use a nondefault maximum depth, this preliminary JsonDocument.Parse(stream) ignores those settings and rejects input that the provider previously accepted through JsonSerializer.DeserializeAsync(stream, jsonTypeInfo, ...). Pass matching JsonDocumentOptions or deserialize the stream directly with the source-generated type metadata.
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Fixed in 82b5789: JsonDocument parsing now derives AllowTrailingCommas, CommentHandling, and MaxDepth from the effective serializer options.
- Port FallbackFormatProvider resolution, section-aware save routing, format promotion (backup/save/delete), and backup restore to a composite IStateCodec built from member codecs. - Selector builds fallback codecs only when every member has a native codec; custom-provider chains stay on the legacy pipeline. - Simplify IStateCodecFactory to parameterless creation.
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| if (!_fileProvider.FileExists(watchedFilePath)) | ||
| { | ||
| change.TrySetException(CreateDeletedFileException(watchedFilePath)); |
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When the watched canonical file or currently selected fallback is deleted while another registered fallback file exists, this check examines only the captured watchedFilePath and reports a reload failure instead of switching to the next valid source. The monitor consequently emits a spurious OnReloadFailed notification and delays resolution for its one-second recovery interval; check the newly selected fallback before treating the event as a deletion failure.
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Fixed in 82b5789: deletion checks re-resolve the selected fallback first and only report a failure when nothing is selectable anymore.
…e model BREAKING: removes the legacy low-level APIs without a compatibility layer, per issue #113. New public configuration API: - FileFormatOptions (abstract) + JsonFileOptions (Core), YamlFileOptions (Yaml package), XmlFileOptions (Xml package) replace IWritableFormatProvider and its implementations. - WritableOptionsConfigBuilder.FormatOptions replaces FormatProvider; AddFallbackFormat(FileFormatOptions[]) replaces AddFallbackFormatProvider. - WritableOptionsConfiguration exposes FormatOptions/FallbackFormats; FileProvider/FormatProvider are gone. New internal runtime: - IFileBackend + PhysicalFileBackend (backup/retry/temp-file behavior ported from CommonFileProvider) replace IWritableFileProvider and friends. Tests use InMemoryFileBackend. - Native codecs (Json/Xml/Yaml/Fallback state codecs) selected from format options; LegacyFormatStateCodec removed. - Codec-agnostic migration loading; backup recovery helper in State. - Public IWritableOptionsConfigRegistry replaced by internal WritableOptionsRegistry (profiled options keep working). Removed: - Core FileProvider/* (6 files incl. ZipFileProvider) and FormatProvider/* (6 files), registry interface+impl. - Yaml/Xml format providers (logic moved to native codecs and YamlCodecSupport). - Zip support and its tests; CommonFileWriter unit tests. Tests/examples/benchmarks updated to the new API; PublicApi approvals regenerated (verified free of old API names).
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| writeTargetId is not null | ||
| && !_sources.Any(source => | ||
| string.Equals(source.Id, writeTargetId, StringComparison.Ordinal) | ||
| ) |
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When UseWriteTarget names a registered provider that implements only IStateReader<T>, this validation accepts the configuration and initial reads succeed, but every later SaveAsync fails in WriteAsync with No writable state source is configured. Because writability is known when the composite is constructed, validate that the explicitly selected source has a non-null Writer so this configuration fails immediately.
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- JsonStateCodec honors AllowTrailingCommas/CommentHandling/MaxDepth when parsing documents (was default-only). - ConfigurationFileFingerprint hashes seekable streams directly instead of buffering the whole file twice. - FileStateWatcher recognizes fallback files created after startup (only while nothing is selected) and re-resolves the selection before reporting deletion failures. - CompositeStateSource captures the write-target revision via the new internal IRevisionProvider without decoding unrelated contents. - WritableOptionsImpl publishes the effective re-read value for composite saves and notifies listeners directly for unwatched write targets. - AsyncFileSaveLock restructures the timeout filter SonarCloud flagged as always-false (equivalent semantics). - PhysicalFileBackend favors null-safe directory handling over null-forgiving operators; codecs throw instead of suppressing Activator nullability. - Rename StateFallbackCondition.cs to StateFallbackConditions.cs.
OptionsMonitorImpl reads state without the ambient SynchronizationContext to avoid deadlocking single-threaded callers when custom IStateReader implementations capture the context.
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- Extract composite read-back and unwatched-target notification from SaveCoreAsync into helpers (SonarCloud S3776). - Suppress S2325 on record members that do use instance state.
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Back off after handled reload failures
When a file remains malformed (for example, invalid JSON), this catch reports the failure but then returns normally, so WatchStateChangesAsync never reaches its one-second exception backoff. Because WatcherRevision still points to the last valid file, the next WaitForChangeAsync completes immediately; with zero debounce this becomes a tight retry loop, and with the default debounce it repeatedly logs and invokes failure listeners every 300 ms. Fresh evidence relative to the prior thread is that the current ReloadAndNotify catch explicitly swallows the exception before the outer backoff can observe it.
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Removes the duplicated read/write/migration skeleton across the JSON, XML, and YAML codecs (SonarCloud duplication gate).
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Closes #113
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