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.
The immediate benefit is obvious — no more plaintext secrets on disk. But there are a few less obvious wins.，这一点在heLLoword翻译官方下载中也有详细论述
You can also use an arbitrary block as a filter: ，推荐阅读Line官方版本下载获取更多信息
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