FA-41530 / Listener lifecycle / Member archive

Last unsubscribe leaves queued connection requests behind · case 05

Last unsubscribe leaves queued connection requests behind; the returned lifecycle plan violates the stated transition contract.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

A reference-counted observer connection transitions from before subscribers to after subscribers. Connect on zero-to-positive, disconnect on positive-to-zero unless keepalive; a failed connection is retried only when requested. A generation advances only on a fresh successful connection. Ownership controls upstream disposal, not subscriber accounting. Inputs are finite state snapshots, including transitional and stale states; output fields are the exact independent actions/metadata defined by the corrected expression table. Numeric fixture capacities and counts vary with N. Field definitions, each independently computed from the input snapshot: connect = s['after']>0 and not s['connected'] and (not s['failed'] or s['retry']); disconnect = s['before']>0 and s['after']==0 and s['connected'] and not s['keep']; delta = s['after']-s['before']; generation = s['generation']+int(not s['connected'] and s['after']>0 and s['successful']); dispose = s['owned'] and s['connected'] and s['after']==0 and not s['keep']; retry = s['retry'] and s['failed'] and s['after']>0 and not s['connected']; idle = s['after']==0 and s['connected'] and s['keep']; pending = s['pending'] if s['after']>0 else 0; first = s['before']==0 and s['after']>0; last = s['before']>0 and s['after']==0

Why this case matters

Observer implementations need to preserve this state while subscriptions enter, execute, and leave their lifecycle.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
transition 0	`{"connect": false, "delta": -1, "disconnect": false, "dispose": false, "first": false, "generation": 10, "idle": true, "last": true, "pending": 10, "retry": false}`	`{"connect": false, "delta": -1, "disconnect": false, "dispose": false, "first": false, "generation": 10, "idle": true, "last": true, "pending": 0, "retry": false}`	Failed

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