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The previous implementation would always use the capacity of the previous buffer, which would effectively prevent it from ever shrinking. This also means that protocol with greater variance in possible frame sizes would likely be heavily over-allocating. If these implementations use zero-copy, this would imply that even small frames kept alive by the client would use large amounts of memory. The change is motivated by the implementation of the cassandra-protocol, which allows frames of up to 256MB in size, which solely depend on the kind of query.
tokio-core
Core I/O and event loop abstraction for asynchronous I/O in Rust built on
futures and mio.
Usage
First, add this to your Cargo.toml:
[dependencies]
tokio-core = "0.1"
Next, add this to your crate:
extern crate tokio_core;
You can find extensive documentation and examples about how to use this crate
online at https://tokio.rs as well as the examples folder
in this repository. The API documentation is also
a great place to get started for the nitty-gritty.
License
tokio-core is primarily distributed under the terms of both the MIT license
and the Apache License (Version 2.0), with portions covered by various BSD-like
licenses.
See LICENSE-APACHE, and LICENSE-MIT for details.