mirror of https://github.com/Minestom/Minestom.git
115 lines
4.3 KiB
Java
115 lines
4.3 KiB
Java
package net.minestom.server.instance;
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import net.minestom.server.MinecraftServer;
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import net.minestom.server.instance.anvil.AnvilLoader;
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import net.minestom.server.utils.async.AsyncUtils;
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import org.jetbrains.annotations.NotNull;
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import org.jetbrains.annotations.Nullable;
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import java.util.Collection;
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import java.util.concurrent.CompletableFuture;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.ForkJoinPool;
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import java.util.concurrent.atomic.AtomicInteger;
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/**
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* Interface implemented to change the way chunks are loaded/saved.
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* <p>
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* See {@link AnvilLoader} for the default implementation used in {@link InstanceContainer}.
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*/
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public interface IChunkLoader {
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/**
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* Loads instance data from the loader.
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*
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* @param instance the instance to retrieve the data from
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*/
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default void loadInstance(@NotNull Instance instance) {
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}
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/**
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* Loads a {@link Chunk}, all blocks should be set since the {@link net.minestom.server.instance.generator.Generator} is not applied.
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*
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* @param instance the {@link Instance} where the {@link Chunk} belong
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* @param chunkX the chunk X
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* @param chunkZ the chunk Z
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* @return a {@link CompletableFuture} containing the chunk, or null if not present
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*/
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@NotNull CompletableFuture<@Nullable Chunk> loadChunk(@NotNull Instance instance, int chunkX, int chunkZ);
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default @NotNull CompletableFuture<Void> saveInstance(@NotNull Instance instance) {
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return AsyncUtils.VOID_FUTURE;
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}
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/**
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* Saves a {@link Chunk} with an optional callback for when it is done.
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*
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* @param chunk the {@link Chunk} to save
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* @return a {@link CompletableFuture} executed when the {@link Chunk} is done saving,
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* should be called even if the saving failed (you can throw an exception).
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*/
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@NotNull CompletableFuture<Void> saveChunk(@NotNull Chunk chunk);
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/**
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* Saves multiple chunks with an optional callback for when it is done.
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* <p>
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* Implementations need to check {@link #supportsParallelSaving()} to support the feature if possible.
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*
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* @param chunks the chunks to save
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* @return a {@link CompletableFuture} executed when the {@link Chunk} is done saving,
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* should be called even if the saving failed (you can throw an exception).
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*/
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default @NotNull CompletableFuture<Void> saveChunks(@NotNull Collection<Chunk> chunks) {
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if (supportsParallelSaving()) {
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ExecutorService parallelSavingThreadPool = ForkJoinPool.commonPool();
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chunks.forEach(c -> parallelSavingThreadPool.execute(() -> saveChunk(c)));
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try {
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parallelSavingThreadPool.shutdown();
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parallelSavingThreadPool.awaitTermination(1L, java.util.concurrent.TimeUnit.DAYS);
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} catch (InterruptedException e) {
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MinecraftServer.getExceptionManager().handleException(e);
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}
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return AsyncUtils.VOID_FUTURE;
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} else {
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CompletableFuture<Void> completableFuture = new CompletableFuture<>();
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AtomicInteger counter = new AtomicInteger();
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for (Chunk chunk : chunks) {
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saveChunk(chunk).whenComplete((unused, throwable) -> {
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final boolean isLast = counter.incrementAndGet() == chunks.size();
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if (isLast) {
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completableFuture.complete(null);
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}
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});
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}
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return completableFuture;
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}
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}
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/**
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* Does this {@link IChunkLoader} allow for multi-threaded saving of {@link Chunk}?
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*
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* @return true if the chunk loader supports parallel saving
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*/
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default boolean supportsParallelSaving() {
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return false;
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}
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/**
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* Does this {@link IChunkLoader} allow for multi-threaded loading of {@link Chunk}?
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*
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* @return true if the chunk loader supports parallel loading
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*/
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default boolean supportsParallelLoading() {
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return false;
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}
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/**
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* Called when a chunk is unloaded, so that this chunk loader can unload any resource it is holding.
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* Note: Minestom currently has no way to determine whether the chunk comes from this loader, so you may get
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* unload requests for chunks not created by the loader.
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*
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* @param chunk the chunk to unload
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*/
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default void unloadChunk(Chunk chunk) {}
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}
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