“Not every store will disappear, but there will be a dramatic shift,” Tim Steiner said at the height of the Covid pandemic, when shopping from the sofa became the only option for many.
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.，推荐阅读同城约会获取更多信息
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