The 9,000-pound monster I don’t want to give back
The API recognizes that synchronous data sources are both necessary and common. The application should not be forced to always accept the performance cost of asynchronous scheduling simply because that's the only option provided. At the same time, mixing sync and async processing can be dangerous. Synchronous paths should always be an option and should always be explicit.
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Generates a wide variety of content types。关于这个话题，51吃瓜提供了深入分析
Stateful transforms are simple objects with member functions that maintain state across calls:，这一点在safew官方下载中也有详细论述