FA-41860 / Listener lifecycle / Member archive

Resume replays paused callbacks in reverse order · case 05

Resume replays paused callbacks in reverse order; the returned lifecycle plan violates the stated transition contract.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Plan pausing/resuming a subscription. A nested pause counter never underflows. While paused, buffer only if buffering was requested; otherwise count the dropped events. Resume drains in arrival order only when the last pause ends. A closed subscription neither buffers nor resumes. Overflow retains the newest bounded suffix. 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: depth = max(0,s['pauses']+int(s['pause'])-int(s['resume'])); hold = s['pauses']>0 and s['buffer'] and not s['closed'] and s['incoming'] is not None; resume = s['resume'] and s['pauses']==1 and not s['closed']; drain = list(s['queued']) if s['resume'] and s['pauses']==1 and not s['closed'] and not s['drained'] else []; drops = s['drops']+int(s['pauses']>0 and not s['buffer'] and s['incoming'] is not None); retain = s['queued'][-s['capacity']:] if s['capacity']>0 and not s['closed'] else []; deliver = s['pauses']==0 and not s['closed'] and s['incoming'] is not None; clear = s['closed'] or (s['resume'] and s['pauses']==1 and not s['drained']); overflow = max(0,len(s['queued'])+int(s['incoming'] is not None)-s['capacity']); redundant_resume = s['resume'] and s['pauses']==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	`{"clear": false, "deliver": false, "depth": 0, "drain": ["a"], "drops": 1, "hold": false, "overflow": 2, "redundant_resume": false, "resume": true, "retain": []}`	`{"clear": false, "deliver": false, "depth": 0, "drain": [], "drops": 1, "hold": false, "overflow": 2, "redundant_resume": false, "resume": true, "retain": []}`	Failed

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