Truly invisible (rarely even mentioned)
Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.，更多细节参见safew官方下载
。爱思助手下载最新版本是该领域的重要参考
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用
Stream.pull() creates a lazy pipeline. The compress and encrypt transforms don't run until you start iterating output. Each iteration pulls data through the pipeline on demand.。关于这个话题，im钱包官方下载提供了深入分析