redis_task_queue 0.3.0

A small Redis-backed task queue for server-side Dart. Enqueue or schedule jobs and process them in a worker with retries, a dead-letter list, and weighted queues.

0.3.0

• Scheduled tasks. enqueue takes an optional processAt (an absolute time) or processIn (a delay from now), set at most one, to hold a task until a future time.
• No new machinery: a scheduled task is scored into the same per-queue delayed sorted set the 0.2.0 retry backoff uses, and the same atomic Lua due-mover promotes it once due. The worker is unchanged.
• The inherited bounds apply: a due task starts up to about a second past its due time (the mover runs once per poll-loop pass), and only while a worker polling that queue is running.
• enqueue without either parameter behaves exactly as in 0.2.0.

0.2.0

• Exponential backoff for retries. A failed task is no longer re-enqueued immediately: it goes into a per-queue delayed sorted set (<prefix>:<queue>:delayed) scored with the time it becomes due, and waits min(cap, base * 2^(retry-1)) plus jitter before being retried.
• Configurable backoff on Worker.connect: backoffBase (default 1s), backoffCap (default 60s), and backoffJitter (default 0.1).
• The worker's poll loop now runs a due-mover each pass that promotes delayed tasks whose score has passed back onto their pending list. The move is a single atomic Redis Lua script (ZRANGEBYSCORE + ZREM + LPUSH), so a task can't be lost or duplicated, even with multiple workers.
• Dead-letter behaviour is unchanged; weighted-queue behaviour is unchanged.

0.1.0

• Initial release.
• Enqueue tasks from a producer, process them in a worker.
• Retries with a dead-letter list after maxRetries.
• Weighted queues to avoid starvation.