Async chunk loading for spigot/paper 1.21.3/1.21.4

[ZockiRR]

This PR brings back async chunk loading for spigot/paper 1.21.3/1.21.4 requested by #4185.

Basically the impl is described here:
#4164 (comment)

Tested on paper 1.21.4.

Let me know if anything else is needed.

[jacob1]

I loaded this on my server, and it's working fine. Although, I've never had major performance issues, so I can't really compare a before -> after. mspt seemed around the same, still generally low.

My server is Spigot 1.21.4, which confirms it works there too (Spigot didn't have async chunk loading before).

[ZockiRR]

The PR has been updated. I hope all matters have been addressed properly.

I have not yet been able to test it myself with paper and hope to do so in the next few days.

@jacob1 would be great if you could test it again with spigot. Thanks in advance.

[jacob1]

Ok I tested it on my server. It threw an exception, I gave a fix. With that fix, it works great.

[hmlendea]

Is there a build artifact of this available anywhere? I'd like to test it on my server on which the latest Dynmap release causes lag.

[masmc05]

Is there a build artifact of this available anywhere? I'd like to test it on my server on which the latest Dynmap release causes lag.

It's a bad idea to download jars from random people, but you can easily compile
Here's the explanation: https://github.com/webbukkit/dynmap?tab=readme-ov-file#how-to-build
Basically first download the code (either use git to clone or use the big green "code" button then "Download code") then run gradle to compile (gradlew.bat setup build on windows or gradlew setup build for rest operating systems)

[ZockiRR]

I fixed the NPE mentioned by @jacob1 and tested on paper. Should be good to go now.

[mikeprimm]

Looks promising - thanks!!