Adds ProposeWaitingRequest, RegisterClusterPending, RemoveClusterPending,
GetClusterPendingRequests, and ClusterPendingCount to PullConsumerEngine,
backed by a ConcurrentDictionary keyed by reply subject. Includes 10 xUnit
tests covering quorum checks, pending tracking, and concurrent access patterns.
Add ResetToSequence to ConsumerManager that updates NextSequence,
clears AckProcessor state via new ClearAll(), and zeroes PendingBytes.
Add AckProcessor.SetAckFloor() that prunes pending entries below the
new floor. Go reference: consumer.go:4241 processResetReq.
Implements DeliveryInterestTracker (consumer.go hasDeliveryInterest /
deleteNotActive) with thread-safe subscribe/unsubscribe counting, a
configurable inactivity timeout for ephemeral consumer auto-deletion, and
10 covering tests. Also adds SlopwatchSuppress to a pre-existing
Task.Delay in MaxDeliveriesTests.cs that was already testing time-based expiry.
Add FilterSkipTracker using SubjectMatch.MatchLiteral() for NATS token-based
filter matching with sorted-set skip sequence gap tracking. Includes 14 tests
covering exact match, star/gt wildcards, multi-filter, counters, RecordSkip,
NextUnskippedSequence, PurgeBelow, and Reset.
Adds MaxDeliver property, exceeded sequence tracking, DrainExceeded,
DeliveryExceededPolicy enum, and ScheduleRedelivery enforcement to
AckProcessor; 10 new tests in MaxDeliveriesTests.cs.
Heartbeat frames now include Nats-Pending-Messages and Nats-Pending-Bytes
headers populated from the ConsumerHandle. Flow control frames increment
FlowControlPendingCount; AcknowledgeFlowControl() decrements it. IsFlowControlStalled
returns true when pending count reaches MaxFlowControlPending (2).
Go reference: consumer.go:5222 (sendIdleHeartbeat), consumer.go:5495 (sendFlowControl).
Add AssignPinId, ValidatePinId, and UnassignPinId to PriorityGroupManager,
plus CurrentPinId tracking on PriorityGroup, porting Go consumer.go
(setPinnedTimer, assignNewPinId) pin ID semantics. Covered by 7 new tests.
Implements a FIFO pull-request queue (WaitingRequestQueue) with per-request
mutable batch countdown and byte budget tracking, plus RemoveExpired cleanup.
Complements the existing priority-based PullRequestWaitQueue for pull consumer delivery.
Go reference: consumer.go waitQueue / processNextMsgRequest (lines 4276-4450).
Add RedeliveryTracker constructor overload, Register(ulong, string) for
tracker-based ack-wait, ProcessAck(ulong) payload-free overload, GetDeadline,
CanRegister for maxAckPending enforcement, ParseAckType static parser, and
AckType enum. All existing API signatures are preserved; 9 new tests added in
AckProcessorEnhancedTests.cs with no regressions to existing 10 tests.
Add new constructor, Schedule(DateTimeOffset), GetDue(DateTimeOffset),
IncrementDeliveryCount, IsMaxDeliveries(), and GetBackoffDelay() to
RedeliveryTracker without breaking existing API. Uses PriorityQueue<ulong,
DateTimeOffset> for deadline-ordered dispatch mirroring Go consumer.go rdq.
StreamManager.Capture now accounts for full message size (subject +
payload + 16-byte overhead) when checking MaxBytes, matching Go's
memStoreMsgSize. PullConsumerEngine uses stream FirstSeq instead of
hardcoded 1 for DeliverAll after purge. Fix 6 tests with Go parity
assertions and updated MaxBytes values.
Joseph Doherty