fix: tell the cache about writes it was never told about - #272
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Subscriptions, information types, notifiers, work groups, global values and bus gateways are held in memory for ten minutes, and a write announces itself with BroadcastRevoke so every instance drops its copy. Eleven write handlers never announced anything. Pausing was the worst of them: the receiving path reads PausedOn off the cached copy, so a paused integration kept taking messages, and resuming could find its own cached copy still paused and return without releasing what it held. Global values were doubly stale — no handler announced them, and Revoke() cleared five of the six keys Load() sets, so nothing could have cleared them anyway. Receive now, Aggregate now and ResetRetryUsage are left alone on purpose: their fields are read from the database, not the cache, so flushing everything on those would cost more than it buys.
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📝 WalkthroughSummary
Riskrisk:low. Changes affect cache invalidation and handler constructor dependencies. They do not change authorization or data access rules. Security-sensitive areasNo security-sensitive logic changed. Cache invalidation reduces the risk of stale subscription and global value data being served. Test coverage
Operational concerns
WalkthroughWrite handlers now broadcast cache revocation after persistence. Existing revocation calls are awaited. In-memory revocation clears global value entries. Integration tests cover subscription pause announcements and global value refreshes. ChangesCache revocation
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The change adds cache invalidation after writes, but a concurrent cache load can still restore stale data after revocation, and resume processing can observe stale paused state before invalidation arrives. This can leave changed configuration or subscriptions stale and potentially strand held work, so the race handling needs fixing or explicit owner acceptance before merge. Suggested labels: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Actionable comments posted: 1
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Inline comments:
In `@SW.Bitween.Api/Services/Caching/InMemoryInfolinkCache.cs`:
- Line 210: Update the GlobalAdapterValuesSetById cache-load path and Revoke
method so an in-flight Load cannot repopulate data after revocation; coordinate
load completion with revocation or track a generation/version and discard any
Load result started before the revocation. Preserve normal caching for loads
that complete after the latest revocation.
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Fix all unresolved CodeRabbit comments on this PR:
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📒 Files selected for processing (17)
SW.Bitween.Api/Resources/ApiGateways/AddPartner.csSW.Bitween.Api/Resources/Documents/Create.csSW.Bitween.Api/Resources/Documents/Delete.csSW.Bitween.Api/Resources/Documents/Update.csSW.Bitween.Api/Resources/GlobalAdapterValuesSets/Create.csSW.Bitween.Api/Resources/GlobalAdapterValuesSets/Delete.csSW.Bitween.Api/Resources/GlobalAdapterValuesSets/Update.csSW.Bitween.Api/Resources/Notifiers/Create.csSW.Bitween.Api/Resources/Notifiers/Delete.csSW.Bitween.Api/Resources/Notifiers/Update.csSW.Bitween.Api/Resources/Subscriptions/Delete.csSW.Bitween.Api/Resources/Subscriptions/Pause.csSW.Bitween.Api/Resources/Subscriptions/SaveMapper.csSW.Bitween.Api/Resources/WorkGroups/Create.csSW.Bitween.Api/Resources/WorkGroups/Delete.csSW.Bitween.Api/Services/Caching/InMemoryInfolinkCache.csSW.Bitween.IntegrationTests/Tests/CacheRevocationTests.cs
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🔇 Additional comments (16)
SW.Bitween.Api/Resources/ApiGateways/AddPartner.cs (1)
18-26: LGTM!Also applies to: 86-88
SW.Bitween.Api/Resources/Documents/Create.cs (1)
20-28: LGTM!Also applies to: 84-86
SW.Bitween.Api/Resources/Documents/Delete.cs (1)
15-22: LGTM!Also applies to: 24-29
SW.Bitween.Api/Resources/GlobalAdapterValuesSets/Create.cs (1)
14-20: LGTM!Also applies to: 40-40
SW.Bitween.Api/Resources/Subscriptions/SaveMapper.cs (1)
42-42: LGTM!SW.Bitween.Api/Resources/WorkGroups/Create.cs (1)
33-33: LGTM!SW.Bitween.Api/Resources/WorkGroups/Delete.cs (1)
29-29: LGTM!SW.Bitween.IntegrationTests/Tests/CacheRevocationTests.cs (1)
1-134: LGTM!SW.Bitween.Api/Resources/GlobalAdapterValuesSets/Delete.cs (1)
13-19: LGTM!Also applies to: 32-32
SW.Bitween.Api/Resources/GlobalAdapterValuesSets/Update.cs (1)
13-19: LGTM!Also applies to: 34-34
SW.Bitween.Api/Resources/Notifiers/Create.cs (1)
13-19: LGTM!Also applies to: 30-30
SW.Bitween.Api/Resources/Notifiers/Delete.cs (1)
12-18: LGTM!Also applies to: 31-31
SW.Bitween.Api/Resources/Subscriptions/Delete.cs (1)
16-23: LGTM!Also applies to: 33-33
SW.Bitween.Api/Resources/Subscriptions/Pause.cs (1)
15-22: LGTM!Also applies to: 45-49
SW.Bitween.Api/Resources/Notifiers/Update.cs (1)
14-20: LGTM!Also applies to: 42-42
SW.Bitween.Api/Resources/Documents/Update.cs (1)
105-105: LGTM!
Load() runs six database reads and then six writes, and Revoke() runs on the bus consumer thread against the same singleton. A revoke landing between the two is revoking the snapshot those reads just took, so publishing it anyway put the staleness straight back for the full ten minutes — the failure this branch exists to prevent. Revoke() now bumps a generation before clearing, and a load whose generation moved reads again instead of publishing. Callers rely on the cache being populated when Load() returns, so the last of three attempts publishes regardless. Raised by CodeRabbit on #272 against the global-values path; it applies to all six cached sets.
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Addressed in 698e887 — the finding is valid, and broader than reported. It's a property of It's pre-existing, but this PR adds 11 new The fix. Not a plain discard: every caller does Not covered by a test, deliberately. Landing a revoke inside the read window needs a seam that doesn't exist, and the alternative — racing threads and asserting on the outcome — is exactly the kind of timing-dependent test that turns into noise. The 175 existing tests exercise Left alone: there's no lock around |
2 participants
The server holds subscriptions, information types, notifiers, work groups, global values and bus gateways in memory for ten minutes, because the message path reads them for every message and cannot go to the database each time. A write announces itself with
BroadcastRevoke(), which publishes to the node exchange so every instance drops its own copy.Eleven write handlers never announced anything.
The worst of them
Pausing.
Pause()raises nothing, andXchangeServicereadsPausedOnoff the cached copy — so a paused integration kept taking messages for the rest of the ten minutes. Resuming has the mirror failure:Process(SubscriptionUnpausedEvent)re-reads the cache, finds its own copy still paused, and returns early without releasing anything it held. Which of the two you get depends on whether an unrelated write happened to revoke in between, so it was nondeterministic.Global values were doubly stale. No handler announced them, and
Revoke()cleared five of the six keysLoad()sets — so nothing could have cleared them anyway.What changed
BroadcastRevoke()added to: Subscriptions Pause + Delete, Documents Create + Delete, Notifiers Create/Update/Delete, GlobalAdapterValuesSets Create/Update/Delete, and ApiGateways AddPartner (which creates a Subscription viaInlineIntegration.Stage).Revoke()now clearsGlobalAdapterValuesSet.await(WorkGroups Create/Delete, SaveMapper, Documents Update), so the revoke could be cut off with the request.Deliberately left alone
Receive nowandAggregate nowsetReceiveOn/AggregateOn, which are read only byDueReceivers/DueAggregationsagainst the database — never off the cache. Broadcasting there would flush everything on every button click.ResetRetryUsagewritesRetryGroupUsage, which isn't cached. The other ApiGateways handlers only touch link rows.Notes for the reviewer
Pauseis asserted individually. The fixture callsAddBus+AddBusPublishbut notAddBusConsume, so no bus consumers run in tests and the revoke round-trip can't be observed there — hence the recordingIInfolinkCacherather than an end-to-end assertion. Making the fixture consume messages would have the suite processing every message it produces.BroadcastRevoke()never clears locally; it only publishes, and the writing instance drops its copy when its own message comes back. If RabbitMQ is down the exception is swallowed by design and nothing is revoked anywhere. Pre-existing, and arguably the right trade, but it's the remaining sharp edge.Testing
175/175 integration tests pass, including after merging the current
releases/r10.0(which bumps SimplyWorks.Bus 8.1.11 → 8.1.18, the package this fix depends on).