Reduce data copying

[wolfchimneyrock]

Is there an existing issue for this?

• [X] I have searched the existing issues

Current Behavior

Currently, there is a lot of time spent copying payload data.

Especially onerous is an entire copy made just to generate a crc32c of the payload.

Using the pack() / flush() API should be be more efficient.

Also, ByteBufferOutputStream copies incoming ByteBuffer contents to "pack" the data. Instead, the incoming ByteBuffers can be appended as-is.

Expected Behavior

No response

Steps To Reproduce

put a high volume of messages into a queue while using Java Flight Recorder to profile the method execution times.

BlazingMQ Java SDK Version

0.0.9

Anything else?

No response