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fix(sessions): replay-buffer gap edge cases, effective-config exposure, capacity-0 tests

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#2: Replace afterSequence+1<oldestRetained with overflow-safe oldestRetained>0&&afterSequence<oldestRetained-1 to prevent ulong wrap at MaxValue falsely reporting gap=true.
#3: Add ReplayBufferCapacity and ReplayRetentionSeconds to EffectiveEventConfiguration and populate from EventOptions in GatewayConfigurationProvider.
#4: Add four new SessionEventDistributorTests covering capacity=0 gap/no-gap paths and the ulong.MaxValue boundary case.
#5: Update class-level <remarks> to describe the Task 3 replay ring buffer (capacity + age eviction, TryGetReplayFrom) rather than its absence.
#6: Add O(n)-is-acceptable comment at TryGetReplayFrom linear scan.
#8: Narrow no-replay 4-arg ctor to internal; InternalsVisibleTo already covers the test project.
This commit is contained in:
Joseph Doherty
2026-06-15 12:48:11 -04:00
parent e962737d2c
commit c2c518862f
4 changed files with 119 additions and 9 deletions
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src/ZB.MOM.WW.MxGateway.Server/Configuration/EffectiveEventConfiguration.cs
+3 -1
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@@ -2,4 +2,6 @@ namespace ZB.MOM.WW.MxGateway.Server.Configuration;
public sealed record EffectiveEventConfiguration(
int QueueCapacity,
string BackpressurePolicy);
string BackpressurePolicy,
int ReplayBufferCapacity,
double ReplayRetentionSeconds);