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Minecraft Mods on CurseForge - The Home for the Best Minecraft Mods

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Minecraft is an action-adventure sandbox game where players can build pretty much anything they like, explore their surroundings, craft items, and even engage in combat.

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ObserverLib is a library mod, usable to reliably observe block changes in a potentially large area with very little performance implications.
&nbsp;
The library is publicly usable and is primarily focused to be used in&nbsp;<a href="https://minecraft.curseforge.com/projects/astral-sorcery" rel="nofollow">Astral Sorcery</a>&nbsp;from 1.13+.
&nbsp;
In essence this mod allows you to <a href="https://github.com/HellFirePvP/ObserverLib/blob/master/src/main/java/hellfirepvp/observerlib/api/ObserverHelper.java#L52" rel="nofollow">register</a> an <a href="https://github.com/HellFirePvP/ObserverLib/blob/master/src/main/java/hellfirepvp/observerlib/api/ChangeObserver.java" rel="nofollow">Observer</a>&nbsp;- whatever it observes in the end is up to the implementation - for a specific area. Changes that happen in the world in its observed area are passed onto the Observer. The observer can then decide on its own what these changes mean; if they invalidate or validate the observer's state. So for example if the structure is now complete or not.
&nbsp;
The actual call to check if things are valid or not is to query the <a href="https://github.com/HellFirePvP/ObserverLib/blob/master/src/main/java/hellfirepvp/observerlib/api/ObserverHelper.java#L73" rel="nofollow">ChangeSubscriber at the relevant position</a>&nbsp;and then <a href="https://github.com/HellFirePvP/ObserverLib/blob/master/src/main/java/hellfirepvp/observerlib/api/ChangeSubscriber.java#L55" rel="nofollow">ask if its current state is valid or not</a>.
&nbsp;
What makes this better than generally just repeatedly checking a large area? What happens if the area you want to observe is larger than a chunk? What happens if the other chunk you have to check becomes unloaded? In order to be sure nothing has changed and the structure is intact, a mod would have to load said chunk and check the block. Potentially an issue if this causes a lot of chunk loading and unloading. The Implementation of ObserverLib makes sure you can relax and the changes passed onto <a href="https://github.com/HellFirePvP/ObserverLib/blob/master/src/main/java/hellfirepvp/observerlib/api/ChangeObserver.java#L79" rel="nofollow">your implementation of notifyChange</a>&nbsp;contain all necessary information to make sure whatever you're observing is still valid or not.
&nbsp;
One exemplary implementation for checking if a structure is built correctly or not can be seen <a href="https://github.com/HellFirePvP/ObserverLib/blob/master/src/main/java/hellfirepvp/observerlib/common/change/ChangeObserverStructure.java#L59" rel="nofollow">here</a>. Instead of always checking everything of the structure's components, the check makes sure to track the positions that are incorrect/mismatching and only works based off of mismatches to what the matcher expects.
&nbsp;
If you're interested in using it for your own projects, you can grab it from maven here:&nbsp;<a href="/linkout?remoteUrl=https%253a%252f%252fmaven.hellfiredev.net%252fhellfirepvp%252fobserverlib%252fobserverlib%252f" rel="nofollow">https://maven.hellfiredev.net/hellfirepvp/observerlib/observerlib/</a>&nbsp;
&nbsp;
For further explanations and details, feel free to ask on the AstralSorcery discord: <a href="https://discord.gg/q37VRcT" rel="nofollow">https://discord.gg/q37VRcT</a>

HellFirePvP

ObserverLib

A Library mod that allows for generic area observation.

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