This is fundamentally different from Web streams' pipeThrough(), which starts actively pumping data from the source to the transform as soon as you set up the pipe. Pull semantics mean you control when processing happens, and stopping iteration stops processing.
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The code for that comes out looking something like this:，推荐阅读下载安装 谷歌浏览器 开启极速安全的 上网之旅。获取更多信息
// 帮不了了，准备阻塞——但阻塞前必须补偿