Distant Horizons•3mo ago

Mod dev question - How to check if a chunk has been cached to sqlite?

Hi. I am currently creating a crude mod to cache chunks on singleplayer or multiplayer by teleporting the player around the spawn area to have their client cache the chunks into DH. What I have currently works on a basic level, however I believe the way I am checking if a chunk is already in the sqlite db is sub optimal:

BlockPos blockPos = some block within the chunk I wish to check;

var cachedBlockData = DhApi.Delayed.terrainRepo.getSingleDataPointAtBlockPos(
    DhApi.Delayed.worldProxy.getSinglePlayerLevel(),
    blockPos.getX(),
    blockPos.getY(),
    blockPos.getZ()
);

bool chunkCached = cachedBlockData.success;

BlockPos blockPos = some block within the chunk I wish to check;

var cachedBlockData = DhApi.Delayed.terrainRepo.getSingleDataPointAtBlockPos(
    DhApi.Delayed.worldProxy.getSinglePlayerLevel(),
    blockPos.getX(),
    blockPos.getY(),
    blockPos.getZ()
);

bool chunkCached = cachedBlockData.success;

(Full repo: https://gitlab.com/billyg270/bb-preload-world) My question is if there is a more preformant way to preform this check. Thanks!

Solution:

That code looks good to me I can’t think of a faster way to check for present/absent data in the DB.

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19 Replies

That Guy•3mo ago

@Moderator

Yeshi•3mo ago

don't ping every mod :unhappy:

BillBodkin•3mo ago

Bro lived up to his name

BackSun•3mo ago

Why did you ping the moderators anyway, this isn’t even your question?

Solution

BackSun•3mo ago

That code looks good to me I can’t think of a faster way to check for present/absent data in the DB.

Yeshi•3mo ago

is DhApi.Delayed.worldProxy.getSinglePlayerLevel(), necessary here? what's it return

BackSun•3mo ago

It returns the level. DH’s api needs to know what level (dimension) to query.

Yeshi•3mo ago

can this not be automatically fetched by blockPos

BackSun•3mo ago

No, a block pos is just 3 integers (x,y,z) the position by itself doesn’t know if it’s in the end or overworld.

Yeshi•3mo ago

might be reading this wrong, is blockPos not a method that's being called

BackSun•3mo ago

Nope, it’s a variable Bill wants to check. And with DH’s API it requires both a level and X, Y, Z coordinate.

Yeshi•3mo ago

OOP is funky, i need to make an effort to properly understand it some day

BillBodkin•3mo ago

Ok fair enough ty, do you think I could run these checks in other threads to help or would that cause issues?

BackSun•3mo ago

Running on a separate thread is a great idea and will work just fine.

BillBodkin•3mo ago

Nice! I will give that a go, thanks!

Yeshi•3mo ago

speaking of threads, is there a chance of having race conditions when writing to the db or does DH/sqlite handle multiple threads writing at the same time gracefully

BackSun•3mo ago

SQLite handles it gracefully. That’s one of the big benefits of running a DB vs flat files.

BillBodkin•3mo ago

Using threads has greatly improved the system! The FPS maintains 60 as the process happens now. Final question on this topic, when using getSingleDataPointAtBlockPos will sucess only return true if all detail levels have been cached? If not if there something else I can call to confirm this?

BillBodkin•3mo ago

Aha! Think I have found what I am looking for

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Mod dev question - How to check if a chunk has been cached to sqlite?