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I made several diagrams for concepts, such as:
，更多细节参见im钱包官方下载
3. 行政辅助：处理文件整理、预约协调等文书工作，帮医院行政部门减负，让医护人员能专注于治病。
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.