naming and restructuring changes to the traits and module structure #2
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Co-authored-by: Nicolae Mihalache <nicolae.mihalache@spaceapplications.com>
When we freeze a BytesMut, we turn it into a Vec, and then convert that to a Bytes. Currently, this happen using Vec::into_boxed_slice, which reallocates to a slice of the same length as the Vev if the length and the capacity are not equal. This can pose a performance problem if the Vec is large or if this happens many times in a loop. Instead, let's compare the length and capacity, and if they're the same, continue to handle this using into_boxed_slice. Otherwise, since we have a type of vtable which can handle a separate capacity, the shared vtable, let's turn our Vec into that kind of Bytes. While this does not avoid allocation altogether, it performs a fixed size allocation and avoids any need to memcpy.
This function can be hot in applications that do a lot of encoding. Ideally would do the same for `<BytesMut as BufMut>::put_slice` and `<BytesMut as BufMut::put_u8`.
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Here are my proposed changes to the module structure as well as the naming, based on your PR.
I think it makes things quite a bit clearer, and the changes to support the module isolation/encapsulation were trivial to implement.
Unfortunately it doesn't diff very well.