task-30: getTaskPollBackoffMs 递增序列
getTaskPollBackoffMs 签名改为 attempt 可选(省略视为 0,向后兼容), 序列 500×factor^attempt、封顶 maxMs 行为由任务 29 的 factor 配置驱动。 新增 8 个测试:attempt0/1/2 值、序列单调、封顶、省略参数默认、 负 attempt 当 0、自定义 factor。
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@@ -66,9 +66,9 @@ export function getTaskProgressCacheTtlMs() {
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return TASK_PROGRESS_VISIBLE_CACHE_MILLIS;
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}
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/** 第 attempt 次退避延迟:base × factor^attempt,封顶 max;attempt 非法时按首次(0)处理 */
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export function getTaskPollBackoffMs(attempt: number) {
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const safe = Number.isFinite(attempt) && attempt > 0 ? Math.floor(attempt) : 0;
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/** 第 attempt 次退避延迟:base × factor^attempt,封顶 max;attempt 省略/非法时按首次(0)处理 */
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export function getTaskPollBackoffMs(attempt?: number) {
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const safe = Number.isFinite(attempt) && (attempt as number) > 0 ? Math.floor(attempt as number) : 0;
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const factor = getTaskPollBackoffFactor();
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const scaled = config.backoffBaseMs * Math.pow(factor, safe);
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return scaled > config.backoffMaxMs ? config.backoffMaxMs : scaled;
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