319a4bc3ba
Reduce garbage on MQTT encoding Motivation: MQTT encoding and decoding is doing unnecessary object allocation in a number of places: - MqttEncoder create many byte[] to encode Strings into UTF-8 bytes - MqttProperties uses Integer keys instead of int - Some enums valueOf create unnecessary arrays on the hot paths - MqttDecoder was using unecessary Result<T> Modification: - ByteBufUtil::utf8Bytes and ByteBufUtil::reserveAndWriteUtf8 allows to perform the same operation GC-free - MqttProperties uses a primitive key map - Implemented GC free const table lookup/switch valueOf - Use some bit-tricks to pack 2 ints into a single primitive long to store both result and numberOfBytesConsumed and use byte[].length to compute numberOfByteConsumed on fly. These changes allowed to save creating Result<T>. Result: Significantly less garbage produced in MQTT encoding/decoding |
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