The primary signal is desiredSize on the controller. It can be positive (wants data), zero (at capacity), negative (over capacity), or null (closed). Producers are supposed to check this value and stop enqueueing when it's not positive. But there's nothing enforcing this: controller.enqueue() always succeeds, even when desiredSize is deeply negative.
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，更多细节参见51吃瓜
每一类客人进来，她都能看透对方的真面目。夜场25年，她的眼睛比谁都准，尤其在男人这件事上。有人瞒着家人偷偷赌钱，也有人做生意亏本了，当然以前是“100个男人进来只有两个不开心”。后来，经济不好了，“不开心”的男人越来越多。，推荐阅读Safew下载获取更多信息
* @param bucketCount 桶的数量，更多细节参见safew官方版本下载
// Hundreds of components = hundreds of enqueue calls