Minecraft Forge 1.18 getLoadedChunks

getLoadedChunks.java

/** For some silly reason {@link ChunkMap#getChunks} is protected, so this is the workaround. */
public static Iterable<ChunkHolder> getLoadedChunks(ServerLevel world) {
    // Ironically, Reflection is probably the most portable way to do this.
    try {
        ChunkMap chunkMap = world.getChunkSource().chunkMap;
        Method getChunks = chunkMap.getClass().getDeclaredMethod("getChunks");
        getChunks.setAccessible(true);

        // AFAIK there's no way to do this cast that Java thinks is safe.
        // ChunkMap.getChunks() only ever returns this type, so it's safe enough.
        @SuppressWarnings("unchecked")
        Iterable<ChunkHolder> chunkIterator = (Iterable<ChunkHolder>) getChunks.invoke(chunkMap);

        return chunkIterator;

        // Any of these exceptions being thrown means we messed something up above, so just explode.
    } catch (NoSuchMethodException e) {
        throw new RuntimeException("ServerChunkCache.getChunks() isn't a method, apparently.", e);
    } catch (IllegalAccessException | InvocationTargetException e) {
        throw new RuntimeException("Failed to invoke ServerChunkCache.getChunks()", e);
    }
}