minecraft-src/net/minecraft/server/ServerFunctionLibrary.java

package net.minecraft.server;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import com.google.common.collect.ImmutableMap.Builder;
import com.mojang.brigadier.CommandDispatcher;
import com.mojang.datafixers.util.Pair;
import com.mojang.logging.LogUtils;
import java.io.BufferedReader;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Map.Entry;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionException;
import java.util.concurrent.Executor;
import net.minecraft.commands.CommandSource;
import net.minecraft.commands.CommandSourceStack;
import net.minecraft.commands.functions.CommandFunction;
import net.minecraft.core.Registry;
import net.minecraft.core.registries.Registries;
import net.minecraft.network.chat.CommonComponents;
import net.minecraft.resources.FileToIdConverter;
import net.minecraft.resources.ResourceKey;
import net.minecraft.resources.ResourceLocation;
import net.minecraft.server.packs.resources.PreparableReloadListener;
import net.minecraft.server.packs.resources.Resource;
import net.minecraft.server.packs.resources.ResourceManager;
import net.minecraft.tags.TagLoader;
import net.minecraft.world.phys.Vec2;
import net.minecraft.world.phys.Vec3;
import org.slf4j.Logger;

public class ServerFunctionLibrary implements PreparableReloadListener {
	private static final Logger LOGGER = LogUtils.getLogger();
	public static final ResourceKey<Registry<CommandFunction<CommandSourceStack>>> TYPE_KEY = ResourceKey.createRegistryKey(
		ResourceLocation.withDefaultNamespace("function")
	);
	private static final FileToIdConverter LISTER = new FileToIdConverter(Registries.elementsDirPath(TYPE_KEY), ".mcfunction");
	private volatile Map<ResourceLocation, CommandFunction<CommandSourceStack>> functions = ImmutableMap.of();
	private final TagLoader<CommandFunction<CommandSourceStack>> tagsLoader = new TagLoader<>(
		(resourceLocation, bl) -> this.getFunction(resourceLocation), Registries.tagsDirPath(TYPE_KEY)
	);
	private volatile Map<ResourceLocation, List<CommandFunction<CommandSourceStack>>> tags = Map.of();
	private final int functionCompilationLevel;
	private final CommandDispatcher<CommandSourceStack> dispatcher;

	public Optional<CommandFunction<CommandSourceStack>> getFunction(ResourceLocation location) {
		return Optional.ofNullable((CommandFunction)this.functions.get(location));
	}

	public Map<ResourceLocation, CommandFunction<CommandSourceStack>> getFunctions() {
		return this.functions;
	}

	public List<CommandFunction<CommandSourceStack>> getTag(ResourceLocation location) {
		return (List<CommandFunction<CommandSourceStack>>)this.tags.getOrDefault(location, List.of());
	}

	public Iterable<ResourceLocation> getAvailableTags() {
		return this.tags.keySet();
	}

	public ServerFunctionLibrary(int functionCompilationLevel, CommandDispatcher<CommandSourceStack> dispatcher) {
		this.functionCompilationLevel = functionCompilationLevel;
		this.dispatcher = dispatcher;
	}

	@Override
	public CompletableFuture<Void> reload(
		PreparableReloadListener.PreparationBarrier barrier, ResourceManager manager, Executor backgroundExecutor, Executor gameExecutor
	) {
		CompletableFuture<Map<ResourceLocation, List<TagLoader.EntryWithSource>>> completableFuture = CompletableFuture.supplyAsync(
			() -> this.tagsLoader.load(manager), backgroundExecutor
		);
		CompletableFuture<Map<ResourceLocation, CompletableFuture<CommandFunction<CommandSourceStack>>>> completableFuture2 = CompletableFuture.supplyAsync(
				() -> LISTER.listMatchingResources(manager), backgroundExecutor
			)
			.thenCompose(
				map -> {
					Map<ResourceLocation, CompletableFuture<CommandFunction<CommandSourceStack>>> map2 = Maps.<ResourceLocation, CompletableFuture<CommandFunction<CommandSourceStack>>>newHashMap();
					CommandSourceStack commandSourceStack = new CommandSourceStack(
						CommandSource.NULL, Vec3.ZERO, Vec2.ZERO, null, this.functionCompilationLevel, "", CommonComponents.EMPTY, null, null
					);

					for (Entry<ResourceLocation, Resource> entry : map.entrySet()) {
						ResourceLocation resourceLocation = (ResourceLocation)entry.getKey();
						ResourceLocation resourceLocation2 = LISTER.fileToId(resourceLocation);
						map2.put(resourceLocation2, CompletableFuture.supplyAsync(() -> {
							List<String> list = readLines((Resource)entry.getValue());
							return CommandFunction.fromLines(resourceLocation2, this.dispatcher, commandSourceStack, list);
						}, backgroundExecutor));
					}

					CompletableFuture<?>[] completableFutures = (CompletableFuture<?>[])map2.values().toArray(new CompletableFuture[0]);
					return CompletableFuture.allOf(completableFutures).handle((void_, throwable) -> map2);
				}
			);
		return completableFuture.thenCombine(completableFuture2, Pair::of)
			.thenCompose(barrier::wait)
			.thenAcceptAsync(
				pair -> {
					Map<ResourceLocation, CompletableFuture<CommandFunction<CommandSourceStack>>> map = (Map<ResourceLocation, CompletableFuture<CommandFunction<CommandSourceStack>>>)pair.getSecond();
					Builder<ResourceLocation, CommandFunction<CommandSourceStack>> builder = ImmutableMap.builder();
					map.forEach((resourceLocation, completableFuturex) -> completableFuturex.handle((commandFunction, throwable) -> {
						if (throwable != null) {
							LOGGER.error("Failed to load function {}", resourceLocation, throwable);
						} else {
							builder.put(resourceLocation, commandFunction);
						}

						return null;
					}).join());
					this.functions = builder.build();
					this.tags = this.tagsLoader.build((Map<ResourceLocation, List<TagLoader.EntryWithSource>>)pair.getFirst());
				},
				gameExecutor
			);
	}

	private static List<String> readLines(Resource resource) {
		try {
			BufferedReader bufferedReader = resource.openAsReader();

			List var2;
			try {
				var2 = bufferedReader.lines().toList();
			} catch (Throwable var5) {
				if (bufferedReader != null) {
					try {
						bufferedReader.close();
					} catch (Throwable var4) {
						var5.addSuppressed(var4);
					}
				}

				throw var5;
			}

			if (bufferedReader != null) {
				bufferedReader.close();
			}

			return var2;
		} catch (IOException var6) {
			throw new CompletionException(var6);
		}
	}
}