1.21 support for Bukkit

bukkit-helper-121/.gitignore

@@ -0,0 +1 @@
+/build/

bukkit-helper-121/build.gradle

@@ -0,0 +1,17 @@
+eclipse {
+    project {
+        name = "Dynmap(Spigot-1.21)"
+    }
+}
+
+description = 'bukkit-helper-1.21'
+
+sourceCompatibility = targetCompatibility = compileJava.sourceCompatibility = compileJava.targetCompatibility = JavaLanguageVersion.of(17) // Need this here so eclipse task generates correctly.
+
+dependencies {
+  implementation project(':bukkit-helper')
+  implementation project(':dynmap-api')
+  implementation project(path: ':DynmapCore', configuration: 'shadow')
+  compileOnly group: 'org.spigotmc', name: 'spigot-api', version:'1.21-R0.1-SNAPSHOT'
+  compileOnly group: 'org.spigotmc', name: 'spigot', version:'1.21-R0.1-SNAPSHOT'
+}

bukkit-helper-121/src/main/java/org/dynmap/bukkit/helper/v121/AsyncChunkProvider121.java

@@ -0,0 +1,130 @@
+package org.dynmap.bukkit.helper.v121;
+
+import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.WorldServer;
+import net.minecraft.world.level.chunk.Chunk;
+import net.minecraft.world.level.chunk.IChunkAccess;
+import net.minecraft.world.level.chunk.storage.ChunkRegionLoader;
+import org.bukkit.Bukkit;
+import org.bukkit.craftbukkit.v1_21_R1.CraftServer;
+import org.bukkit.craftbukkit.v1_21_R1.CraftWorld;
+import org.dynmap.MapManager;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.Objects;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.function.BiConsumer;
+import java.util.function.Supplier;
+
+/**
+ * The provider used to work with paper libs
+ * Because paper libs need java 17 we can't interact with them directly
+ */
+@SuppressWarnings({"JavaReflectionMemberAccess"}) //java don't know about paper
+public class AsyncChunkProvider121 {
+    private final Method getChunk;
+    private final Method getAsyncSaveData;
+    private final Method save;
+    private final Enum<?> data;
+    private final Enum<?> priority;
+    private int currTick = MinecraftServer.currentTick;
+    private int currChunks = 0;
+
+    AsyncChunkProvider121() {
+        try {
+            Method getChunk1 = null;
+            Method getAsyncSaveData1 = null;
+            Method save1 = null;
+            Enum<?> priority1 = null;
+            Enum<?> data1 = null;
+            try {
+                Class<?> threadClass = Class.forName("io.papermc.paper.chunk.system.io.RegionFileIOThread");
+
+                Class<?> dataclass = Arrays.stream(threadClass.getDeclaredClasses())
+                        .filter(c -> c.getSimpleName().equals("RegionFileType"))
+                        .findAny()
+                        .orElseThrow(NullPointerException::new);
+                data1 = Enum.valueOf(cast(dataclass), "CHUNK_DATA");
+
+                Class<?> priorityClass = Arrays.stream(Class.forName("ca.spottedleaf.concurrentutil.executor.standard.PrioritisedExecutor").getClasses())
+                        .filter(c -> c.getSimpleName().equals("Priority"))
+                        .findAny()
+                        .orElseThrow(NullPointerException::new);
+                //Almost lowest priority, but not quite so low as to be considered idle
+                //COMPLETING->BLOCKING->HIGHEST->HIGHER->HIGH->NORMAL->LOW->LOWER->LOWEST->IDLE
+                priority1 = Enum.valueOf(cast(priorityClass), "LOWEST");
+
+                getAsyncSaveData1 = ChunkRegionLoader.class.getMethod("getAsyncSaveData", WorldServer.class, IChunkAccess.class);
+                save1 = ChunkRegionLoader.class.getMethod("saveChunk", WorldServer.class, IChunkAccess.class, getAsyncSaveData1.getReturnType());
+                getChunk1 = threadClass.getMethod("loadDataAsync", WorldServer.class, int.class, int.class, data1.getClass(), BiConsumer.class, boolean.class, priority1.getClass());
+            } catch (ClassNotFoundException | NoSuchMethodException e) {
+                e.printStackTrace();
+            }
+            getAsyncSaveData = Objects.requireNonNull(getAsyncSaveData1);
+            save = Objects.requireNonNull(save1);
+            getChunk = Objects.requireNonNull(getChunk1);
+            data = Objects.requireNonNull(data1);
+            priority = Objects.requireNonNull(priority1);
+        } catch (Throwable e) {
+            e.printStackTrace();
+            throw new RuntimeException(e);
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    private <T> T cast(Object o) {
+        return (T) o;
+    }
+    public CompletableFuture<NBTTagCompound> getChunk(WorldServer world, int x, int y) throws InvocationTargetException, IllegalAccessException {
+        CompletableFuture<NBTTagCompound> future = new CompletableFuture<>();
+        getChunk.invoke(null, world, x, y, data, (BiConsumer<NBTTagCompound, Throwable>) (nbt, exception) -> future.complete(nbt), true, priority);
+        return future;
+    }
+
+    public synchronized Supplier<NBTTagCompound> getLoadedChunk(CraftWorld world, int x, int z) {
+        if (!world.isChunkLoaded(x, z)) return () -> null;
+        Chunk c = world.getHandle().getChunkIfLoaded(x, z); //already safe async on vanilla
+        if ((c == null) || !c.q) return () -> null;    // c.loaded
+        if (currTick != MinecraftServer.currentTick) {
+            currTick = MinecraftServer.currentTick;
+            currChunks = 0;
+        }
+        //prepare data synchronously
+        CompletableFuture<?> future = CompletableFuture.supplyAsync(() -> {
+            //Null will mean that we save with spigot methods, which may be risky on async
+            //Since we're not in main thread, it now refuses new tasks because of shutdown, the risk is lower
+            if (!Bukkit.isPrimaryThread()) return null;
+            try {
+                return getAsyncSaveData.invoke(null, world.getHandle(), c);
+            } catch (ReflectiveOperationException e) {
+                throw new RuntimeException(e);
+            }
+        }, ((CraftServer) Bukkit.getServer()).getServer());
+        //we shouldn't stress main thread
+        if (++currChunks > MapManager.mapman.getMaxChunkLoadsPerTick()) {
+            try {
+                Thread.sleep(25); //hold the lock so other threads also won't stress main thread
+            } catch (InterruptedException ignored) {}
+        }
+        //save data asynchronously
+        return () -> {
+            Object o = null;
+            try {
+                o = future.get();
+                return (NBTTagCompound) save.invoke(null, world.getHandle(), c, o);
+            } catch (InterruptedException e) {
+                return null;
+            } catch (InvocationTargetException e) {
+                //We tried to use simple spigot methods at shutdown and failed, hopes for reading from disk
+                if (o == null) return null;
+                throw new RuntimeException(e);
+            } catch (ReflectiveOperationException | ExecutionException e) {
+                throw new RuntimeException(e);
+            }
+        };
+    }
+}