this is sort of the opposite question to this question. if there is a low application POST body size limit, say 8 KB, can we assume this request will be read as a single ByteBuffer?
No.
NIO feeds the bytes as the network has them, and doesn't do any internal buffering of its own. The result is that we cannot assume we will get a read of a single specific size.
If this use-case is important to you, can I ask you to file a bug report on the repo? It's conceivably something we could add support for, potentially without requiring any buffering on at least some platforms.
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it’s not really that important of a use-case, i was only wondering if i was duplicating work that NIO already does internally by copying to a new buffer. if there are no performance wins to be gained by re-using NIO’s buffer allocations, it is a lot easier to transfer everything to [UInt8], because things that don’t link NIO (like BSON decoders) can speak [UInt8].
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