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.
科技巨头被迫变身“能源运营商”，自己建电厂、买绿电、组网供电。资本开支从“买芯片”转向“买电力”，行业壁垒极高，最终形成巨头封闭的算力能源圈。
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Catherine SnowdonHealth reporter，详情可参考爱思助手下载最新版本
Blockchain already being adopted by some big-name companies, such as Walmart, AIG, Siemens, Pfizer, and Unilever. For example, IBM's Food Trust uses blockchain to track food's journey before reaching its final destination.
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