Node 流中的结束和结束事件有什么区别 [英] What's the difference between end and finish events in Node streams

问题描述

Node.js 流同时触发 end 和 finish 事件.两者有什么区别?

Node.js streams triggers both end and finish events. What's the difference between both?

推荐答案

end 和 finish 是同一个事件，但是在不同类型的流上.

end and finish are the same event BUT on different types of Streams.

• stream.Readable 只触发 end 而从不 finish
• stream.Writable 只触发 finish 而从不 end

• stream.Readable fires ONLY end and NEVER finish
• stream.Writable fires ONLY finish and NEVER end

来源:https://nodejs.org/dist/latest-v5.x/docs/api/stream.html

为什么同一事件的命名不同?

我能想到的唯一原因是双工流 (stream.Duplex)，它同时实现了 stream.Readable 和 stream.Writable 接口(https://nodejs.org/dist/latest-v5.x/docs/api/stream.html#stream_class_stream_duplex) 同时是可读和可写的流.要区分流上的读取结束和写入结束，您必须触发不同的事件.所以，对于双工流，end 是读取结束，finish 是写入结束.

The only reason I could think of is because of duplex streams (stream.Duplex), which implement both stream.Readable and stream.Writable interfaces (https://nodejs.org/dist/latest-v5.x/docs/api/stream.html#stream_class_stream_duplex) are readable and writable stream at the same time. To differentiate between end of reading and end of writing on the stream you must have a different event fired. SO, for Duplex streams end is end of reading and finish is end of writing.

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