async_task_queue.md

async task queue

Language: Python · Sphere: programming · Category: Async

What it does

Async Task Queue with Priority and Retries

A production-ready async task queue implementation with priority levels, automatic retries with exponential backoff, and dead-letter queue handling.

Guarantee

When it runs, async task queue guarantees stats['completed'] == 3 and stats['processing'] == 0; s['completed'] == 3; order == ['high', 'norm', 'low'] (proven by run).

Checkable constraints:

• order == ['high', 'norm', 'low']
• await q.dequeue() is None
• await q.complete_task(t_high.id) is True
• await q.complete_task(t_high.id) is False
• await q.complete_task('ghost') is False
• stats['completed'] == 3 and stats['processing'] == 0
• got.id == flaky.id
• await q.fail_task(flaky.id, 'boom-1') is True

Verification evidence

• Green-run: ✓ passes (re-run under the extractor's gate)
• Constraint strength: recovery (truth-pinned)
• Independent oracle: ✓ consensus — xlang (validator v1.9)
• Peer review: unreviewed

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