Add support for Paper async chunk generation

Bukkit/src/main/java/com/github/intellectualsites/plotsquared/bukkit/BukkitMain.java

@@ -63,6 +63,7 @@ public final class BukkitMain extends JavaPlugin implements Listener, IPlotMain
             Settings.load(new File("plugins/PlotSquared/config/settings.yml"));
         } catch (Throwable ignored) {
         }
+
         // Force WorldEdit to load
         try {
             System.out.println("[P2] Force loading WorldEdit");

Bukkit/src/main/java/com/github/intellectualsites/plotsquared/bukkit/generator/BukkitPlotGenerator.java

@@ -4,21 +4,19 @@ import com.github.intellectualsites.plotsquared.bukkit.util.BukkitUtil;
 import com.github.intellectualsites.plotsquared.bukkit.util.block.GenChunk;
 import com.github.intellectualsites.plotsquared.plot.PlotSquared;
 import com.github.intellectualsites.plotsquared.plot.generator.GeneratorWrapper;
-import com.github.intellectualsites.plotsquared.plot.generator.HybridPlotWorld;
 import com.github.intellectualsites.plotsquared.plot.generator.IndependentPlotGenerator;
-import com.github.intellectualsites.plotsquared.plot.object.*;
+import com.github.intellectualsites.plotsquared.plot.object.ChunkLoc;
+import com.github.intellectualsites.plotsquared.plot.object.ChunkWrapper;
+import com.github.intellectualsites.plotsquared.plot.object.PlotArea;
 import com.github.intellectualsites.plotsquared.plot.object.worlds.SingleWorldGenerator;
 import com.github.intellectualsites.plotsquared.plot.util.ChunkManager;
 import com.github.intellectualsites.plotsquared.plot.util.MainUtil;
-import com.github.intellectualsites.plotsquared.plot.util.MathMan;
-import com.github.intellectualsites.plotsquared.plot.util.block.GlobalBlockQueue;
-import com.github.intellectualsites.plotsquared.plot.util.block.LocalBlockQueue;
 import com.github.intellectualsites.plotsquared.plot.util.block.ScopedLocalBlockQueue;
-import org.bukkit.Chunk;
 import org.bukkit.World;
 import org.bukkit.block.Biome;
 import org.bukkit.generator.BlockPopulator;
 import org.bukkit.generator.ChunkGenerator;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -28,7 +26,8 @@ import java.util.Set;
 public class BukkitPlotGenerator extends ChunkGenerator
     implements GeneratorWrapper<ChunkGenerator> {
 
-    private final GenChunk chunkSetter;
+    @SuppressWarnings("unused") public final boolean PAPER_ASYNC_SAFE = true;
+
     private final IndependentPlotGenerator plotGenerator;
     private final ChunkGenerator platformGenerator;
     private final boolean full;
@@ -41,24 +40,8 @@ public class BukkitPlotGenerator extends ChunkGenerator
         }
         this.plotGenerator = generator;
         this.platformGenerator = this;
-        populators = new ArrayList<>();
+        this.populators = new ArrayList<>();
-        this.populators.add(new BlockPopulator() {
+        this.populators.add(new PlotBlockPopulator(this.plotGenerator));
-
-            private LocalBlockQueue queue;
-
-            @Override public void populate(World world, Random random, Chunk source) {
-                if (queue == null) {
-                    queue = GlobalBlockQueue.IMP.getNewQueue(world.getName(), false);
-                }
-                PlotArea area = PlotSquared.get().getPlotArea(world.getName(), null);
-                ChunkWrapper wrap = new ChunkWrapper(area.worldname, source.getX(), source.getZ());
-                ScopedLocalBlockQueue chunk = queue.getForChunk(wrap.x, wrap.z);
-                if (BukkitPlotGenerator.this.plotGenerator.populateChunk(chunk, area)) {
-                    queue.flush();
-                }
-            }
-        });
-        this.chunkSetter = new GenChunk(null, null);
         this.full = true;
         MainUtil.initCache();
     }
@@ -69,108 +52,8 @@ public class BukkitPlotGenerator extends ChunkGenerator
                 + " is already a BukkitPlotGenerator!");
         }
         this.full = false;
-        //todo figure out why this was put here in the first place:
-        //PlotSquared.debug("BukkitPlotGenerator does not fully support: " + cg);
         this.platformGenerator = cg;
-        this.plotGenerator = new IndependentPlotGenerator() {
+        this.plotGenerator = new DelegatePlotGenerator(cg, world);
-            @Override public void initialize(PlotArea area) {
-            }
-
-            @Override public PlotManager getNewPlotManager() {
-                return PlotSquared.get().IMP.getDefaultGenerator().getNewPlotManager();
-            }
-
-            @Override public String getName() {
-                return cg.getClass().getName();
-            }
-
-            @Override
-            public PlotArea getNewPlotArea(String world, String id, PlotId min, PlotId max) {
-                return PlotSquared.get().IMP.getDefaultGenerator()
-                    .getNewPlotArea(world, id, min, max);
-            }
-
-            @Override public BlockBucket[][] generateBlockBucketChunk(PlotArea settings) {
-                BlockBucket[][] blockBuckets = new BlockBucket[16][];
-                HybridPlotWorld hpw = (HybridPlotWorld) settings;
-                // Bedrock
-                if (hpw.PLOT_BEDROCK) {
-                    for (short x = 0; x < 16; x++) {
-                        for (short z = 0; z < 16; z++) {
-                            blockBuckets[0][(z << 4) | x] =
-                                BlockBucket.withSingle(PlotBlock.get("bedrock"));
-                        }
-                    }
-                }
-                for (short x = 0; x < 16; x++) {
-                    for (short z = 0; z < 16; z++) {
-                        for (int y = 1; y < hpw.PLOT_HEIGHT; y++) {
-                            blockBuckets[y >> 4][((y & 0xF) << 8) | (z << 4) | x] = hpw.MAIN_BLOCK;
-                        }
-                        blockBuckets[hpw.PLOT_HEIGHT >> 4][((hpw.PLOT_HEIGHT & 0xF) << 8) | (z << 4)
-                            | x] = hpw.MAIN_BLOCK;
-                    }
-                }
-                return blockBuckets;
-            }
-
-            @Override
-            public void generateChunk(final ScopedLocalBlockQueue result, PlotArea settings) {
-                World w = BukkitUtil.getWorld(world);
-                Location min = result.getMin();
-                int cx = min.getX() >> 4;
-                int cz = min.getZ() >> 4;
-                Random r = new Random(MathMan.pair((short) cx, (short) cz));
-                BiomeGrid grid = new BiomeGrid() {
-                    @Override public void setBiome(int x, int z, Biome biome) {
-                        result.setBiome(x, z, biome.name());
-                    }
-
-                    @Override public Biome getBiome(int x, int z) {
-                        return Biome.FOREST;
-                    }
-                };
-                try {
-                    // ChunkData will spill a bit
-                    ChunkData data = cg.generateChunkData(w, r, cx, cz, grid);
-                    if (data != null) {
-                        return;
-                    }
-                } catch (Throwable ignored) {
-                }
-                /* TODO: Redo this
-                // Populator spillage
-                short[][] tmp = cg.generateExtBlockSections(w, r, cx, cz, biomeGrid);
-                if (tmp != null) {
-                    for (int i = 0; i < tmp.length; i++) {
-                        short[] section = tmp[i];
-                        if (section == null) {
-                            if (i < 7) {
-                                for (int x = 0; x < 16; x++) {
-                                    for (int z = 0; z < 16; z++) {
-                                        for (int y = i << 4; y < (i << 4) + 16; y++) {
-                                            result.setBlock(x, y, z, PlotBlock.get("air"));
-                                        }
-                                    }
-                                }
-                            }
-                            continue;
-                        }
-                        for (int j = 0; j < section.length; j++) {
-                            int x = MainUtil.x_loc[i][j];
-                            int y = MainUtil.y_loc[i][j];
-                            int z = MainUtil.z_loc[i][j];
-                            result.setBlock(x, y, z, section[j], (byte) 0);
-                        }
-                    }
-                }
-                */
-                for (BlockPopulator populator : cg.getDefaultPopulators(w)) {
-                    populator.populate(w, r, w.getChunkAt(cx, cz));
-                }
-            }
-        };
-        this.chunkSetter = new GenChunk(null, new ChunkWrapper(world, 0, 0));
         MainUtil.initCache();
     }
 
@@ -190,7 +73,7 @@ public class BukkitPlotGenerator extends ChunkGenerator
         return this.platformGenerator;
     }
 
-    @Override public List<BlockPopulator> getDefaultPopulators(World world) {
+    @Override @NotNull public List<BlockPopulator> getDefaultPopulators(@NotNull World world) {
         try {
             if (!this.loaded) {
                 String name = world.getName();
@@ -224,17 +107,20 @@ public class BukkitPlotGenerator extends ChunkGenerator
         if (populators == null && platformGenerator != null) {
             populators = new ArrayList<>(platformGenerator.getDefaultPopulators(world));
         }
+        if (populators != null) {
             for (BlockPopulator populator : this.populators) {
                 if (!existing.contains(populator)) {
                     toAdd.add(populator);
                 }
             }
+        }
         return toAdd;
     }
 
-    @Override
+    @Override @NotNull public ChunkData generateChunkData(@NotNull World world, @NotNull Random random,
-    public ChunkData generateChunkData(World world, Random random, int x, int z, BiomeGrid biome) {
+        int x, int z, @NotNull BiomeGrid biome) {
-        GenChunk result = this.chunkSetter;
+
+        GenChunk result =  new GenChunk();
         if (this.getPlotGenerator() instanceof SingleWorldGenerator) {
             if (result.getCd() != null) {
                 for (int cx = 0; cx < 16; cx++) {
@@ -258,7 +144,7 @@ public class BukkitPlotGenerator extends ChunkGenerator
             if (this.platformGenerator != this) {
                 return this.platformGenerator.generateChunkData(world, random, x, z, biome);
             } else {
-                generate(world, result);
+                generate(new ChunkLoc(x, z), world, result);
             }
         } catch (Throwable e) {
             e.printStackTrace();
@@ -267,7 +153,7 @@ public class BukkitPlotGenerator extends ChunkGenerator
         return result.getCd();
     }
 
-    private void generate(World world, ScopedLocalBlockQueue result) {
+    private void generate(ChunkLoc loc, World world, ScopedLocalBlockQueue result) {
         // Load if improperly loaded
         if (!this.loaded) {
             String name = world.getName();
@@ -275,17 +161,17 @@ public class BukkitPlotGenerator extends ChunkGenerator
             this.loaded = true;
         }
         // Process the chunk
-        if (ChunkManager.preProcessChunk(result)) {
+        if (ChunkManager.preProcessChunk(loc, result)) {
             return;
         }
         PlotArea area = PlotSquared.get().getPlotArea(world.getName(), null);
         try {
-            this.plotGenerator.generateChunk(this.chunkSetter, area);
+            this.plotGenerator.generateChunk(result, area);
         } catch (Throwable e) {
             // Recover from generator error
             e.printStackTrace();
         }
-        ChunkManager.postProcessChunk(result);
+        ChunkManager.postProcessChunk(loc, result);
     }
 
     /**
@@ -296,7 +182,7 @@ public class BukkitPlotGenerator extends ChunkGenerator
      * @param z     Ignored
      * @return always true
      */
-    @Override public boolean canSpawn(World world, int x, int z) {
+    @Override public boolean canSpawn(@NotNull final World world, final int x, final int z) {
         return true;
     }
 
@@ -311,10 +197,11 @@ public class BukkitPlotGenerator extends ChunkGenerator
         }
     }
 
-    @Override public boolean equals(Object obj) {
+    @Override public boolean equals(final Object obj) {
         if (obj == null) {
             return false;
         }
         return toString().equals(obj.toString()) || toString().equals(obj.getClass().getName());
     }
+
 }

Bukkit/src/main/java/com/github/intellectualsites/plotsquared/bukkit/generator/DelegatePlotGenerator.java

@@ -0,0 +1,91 @@
+package com.github.intellectualsites.plotsquared.bukkit.generator;
+
+import com.github.intellectualsites.plotsquared.bukkit.util.BukkitUtil;
+import com.github.intellectualsites.plotsquared.plot.PlotSquared;
+import com.github.intellectualsites.plotsquared.plot.generator.HybridPlotWorld;
+import com.github.intellectualsites.plotsquared.plot.generator.IndependentPlotGenerator;
+import com.github.intellectualsites.plotsquared.plot.object.*;
+import com.github.intellectualsites.plotsquared.plot.util.MathMan;
+import com.github.intellectualsites.plotsquared.plot.util.block.ScopedLocalBlockQueue;
+import lombok.RequiredArgsConstructor;
+import org.bukkit.World;
+import org.bukkit.block.Biome;
+import org.bukkit.generator.BlockPopulator;
+import org.bukkit.generator.ChunkGenerator;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Random;
+
+@RequiredArgsConstructor final class DelegatePlotGenerator extends IndependentPlotGenerator {
+
+    private final ChunkGenerator chunkGenerator;
+    private final String world;
+
+    @Override public void initialize(PlotArea area) {
+    }
+
+    @Override public PlotManager getNewPlotManager() {
+        return PlotSquared.get().IMP.getDefaultGenerator().getNewPlotManager();
+    }
+
+    @Override public String getName() {
+        return this.chunkGenerator.getClass().getName();
+    }
+
+    @Override
+    public PlotArea getNewPlotArea(String world, String id, PlotId min, PlotId max) {
+        return PlotSquared.get().IMP.getDefaultGenerator()
+            .getNewPlotArea(world, id, min, max);
+    }
+
+    @Override public BlockBucket[][] generateBlockBucketChunk(PlotArea settings) {
+        BlockBucket[][] blockBuckets = new BlockBucket[16][];
+        HybridPlotWorld hpw = (HybridPlotWorld) settings;
+        // Bedrock
+        if (hpw.PLOT_BEDROCK) {
+            for (short x = 0; x < 16; x++) {
+                for (short z = 0; z < 16; z++) {
+                    blockBuckets[0][(z << 4) | x] =
+                        BlockBucket.withSingle(PlotBlock.get("bedrock"));
+                }
+            }
+        }
+        for (short x = 0; x < 16; x++) {
+            for (short z = 0; z < 16; z++) {
+                for (int y = 1; y < hpw.PLOT_HEIGHT; y++) {
+                    blockBuckets[y >> 4][((y & 0xF) << 8) | (z << 4) | x] = hpw.MAIN_BLOCK;
+                }
+                blockBuckets[hpw.PLOT_HEIGHT >> 4][((hpw.PLOT_HEIGHT & 0xF) << 8) | (z << 4)
+                    | x] = hpw.MAIN_BLOCK;
+            }
+        }
+        return blockBuckets;
+    }
+
+    @Override
+    public void generateChunk(final ScopedLocalBlockQueue result, PlotArea settings) {
+        World w = BukkitUtil.getWorld(world);
+        Location min = result.getMin();
+        int cx = min.getX() >> 4;
+        int cz = min.getZ() >> 4;
+        Random r = new Random(MathMan.pair((short) cx, (short) cz));
+        ChunkGenerator.BiomeGrid grid = new ChunkGenerator.BiomeGrid() {
+            @Override public void setBiome(int x, int z, Biome biome) {
+                result.setBiome(x, z, biome.name());
+            }
+
+            @Override @NotNull public Biome getBiome(int x, int z) {
+                return Biome.FOREST;
+            }
+        };
+        try {
+            chunkGenerator.generateChunkData(w, r, cx, cz, grid);
+            return;
+        } catch (Throwable ignored) {
+        }
+        for (BlockPopulator populator : chunkGenerator.getDefaultPopulators(w)) {
+            populator.populate(w, r, w.getChunkAt(cx, cz));
+        }
+    }
+
+}

Bukkit/src/main/java/com/github/intellectualsites/plotsquared/bukkit/generator/PlotBlockPopulator.java

@@ -0,0 +1,34 @@
+package com.github.intellectualsites.plotsquared.bukkit.generator;
+
+import com.github.intellectualsites.plotsquared.plot.PlotSquared;
+import com.github.intellectualsites.plotsquared.plot.generator.IndependentPlotGenerator;
+import com.github.intellectualsites.plotsquared.plot.object.ChunkWrapper;
+import com.github.intellectualsites.plotsquared.plot.object.PlotArea;
+import com.github.intellectualsites.plotsquared.plot.util.block.GlobalBlockQueue;
+import com.github.intellectualsites.plotsquared.plot.util.block.LocalBlockQueue;
+import com.github.intellectualsites.plotsquared.plot.util.block.ScopedLocalBlockQueue;
+import lombok.RequiredArgsConstructor;
+import org.bukkit.Chunk;
+import org.bukkit.World;
+import org.bukkit.generator.BlockPopulator;
+
+import java.util.Random;
+
+@RequiredArgsConstructor final class PlotBlockPopulator extends BlockPopulator {
+
+    private final IndependentPlotGenerator plotGenerator;
+    private LocalBlockQueue queue;
+
+    @Override public void populate(final World world, final Random random, final Chunk source) {
+        if (this.queue == null) {
+            this.queue = GlobalBlockQueue.IMP.getNewQueue(world.getName(), false);
+        }
+        final PlotArea area = PlotSquared.get().getPlotArea(world.getName(), null);
+        final ChunkWrapper wrap = new ChunkWrapper(area.worldname, source.getX(), source.getZ());
+        final ScopedLocalBlockQueue chunk = this.queue.getForChunk(wrap.x, wrap.z);
+        if (this.plotGenerator.populateChunk(chunk, area)) {
+            this.queue.flush();
+        }
+    }
+
+}

Bukkit/src/main/java/com/github/intellectualsites/plotsquared/bukkit/util/block/GenChunk.java

@@ -30,7 +30,7 @@ public class GenChunk extends ScopedLocalBlockQueue {
     public int cz;
     @Getter @Setter private ChunkData cd = null;
 
-    public GenChunk(Chunk chunk, ChunkWrapper wrap) {
+    public GenChunk() {
         super(null, new Location(null, 0, 0, 0), new Location(null, 15, 255, 15));
         this.biomes = Biome.values();
     }
@@ -167,8 +167,7 @@ public class GenChunk extends ScopedLocalBlockQueue {
     }
 
     public GenChunk clone() {
-        GenChunk toReturn =
+        GenChunk toReturn = new GenChunk();
-            new GenChunk(chunk, new ChunkWrapper(getWorld(), chunk.getX(), chunk.getZ()));
         if (this.result != null) {
             for (int i = 0; i < this.result.length; i++) {
                 PlotBlock[] matrix = this.result[i];

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/generator/HybridGen.java

@@ -7,8 +7,6 @@ import com.github.intellectualsites.plotsquared.plot.util.MathMan;
 import com.github.intellectualsites.plotsquared.plot.util.block.ScopedLocalBlockQueue;
 import com.sk89q.worldedit.world.block.BaseBlock;
 
-import java.util.HashMap;
-
 public class HybridGen extends IndependentPlotGenerator {
 
     @Override public String getName() {
@@ -121,7 +119,6 @@ public class HybridGen extends IndependentPlotGenerator {
             }
         }
         // generation
-        HashMap<Integer, BaseBlock[]> sch = hpw.G_SCH;
         for (short x = 0; x < 16; x++) {
             if (gx[x]) {
                 for (short z = 0; z < 16; z++) {

Core/src/main/java/com/github/intellectualsites/plotsquared/plot/util/ChunkManager.java

@@ -7,16 +7,14 @@ import com.github.intellectualsites.plotsquared.plot.util.block.LocalBlockQueue;
 import com.github.intellectualsites.plotsquared.plot.util.block.ScopedLocalBlockQueue;
 
 import java.io.File;
-import java.util.ArrayList;
+import java.util.*;
-import java.util.Collection;
+import java.util.concurrent.ConcurrentHashMap;
-import java.util.HashSet;
-import java.util.Set;
 
 public abstract class ChunkManager {
 
     public static ChunkManager manager = null;
-    private static RunnableVal<ScopedLocalBlockQueue> CURRENT_FORCE_CHUNK;
+    private static final Map<ChunkLoc, RunnableVal<ScopedLocalBlockQueue>> forceChunks = new ConcurrentHashMap<>();
-    private static RunnableVal<ScopedLocalBlockQueue> CURRENT_ADD_CHUNK;
+    private static final Map<ChunkLoc, RunnableVal<ScopedLocalBlockQueue>> addChunks = new ConcurrentHashMap<>();
 
     public static ChunkLoc getChunkChunk(Location location) {
         int x = location.getX() >> 9;
@@ -43,27 +41,29 @@ public abstract class ChunkManager {
             }
             queue.flush();
         } else {
-            CURRENT_FORCE_CHUNK = force;
+            forceChunks.put(loc, force);
-            CURRENT_ADD_CHUNK = add;
+            addChunks.put(loc, add);
             queue.regenChunk(loc.x, loc.z);
-            CURRENT_FORCE_CHUNK = null;
+            forceChunks.remove(loc);
-            CURRENT_ADD_CHUNK = null;
+            addChunks.remove(loc);
         }
     }
 
-    public static boolean preProcessChunk(ScopedLocalBlockQueue queue) {
+    public static boolean preProcessChunk(ChunkLoc loc, ScopedLocalBlockQueue queue) {
-        if (CURRENT_FORCE_CHUNK != null) {
+        final RunnableVal<ScopedLocalBlockQueue> forceChunk = forceChunks.get(loc);
-            CURRENT_FORCE_CHUNK.run(queue);
+        if (forceChunk != null) {
-            CURRENT_FORCE_CHUNK = null;
+            forceChunk.run(queue);
+            forceChunks.remove(loc);
             return true;
         }
         return false;
     }
 
-    public static boolean postProcessChunk(ScopedLocalBlockQueue queue) {
+    public static boolean postProcessChunk(ChunkLoc loc, ScopedLocalBlockQueue queue) {
-        if (CURRENT_ADD_CHUNK != null) {
+        final RunnableVal<ScopedLocalBlockQueue> addChunk = forceChunks.get(loc);
-            CURRENT_ADD_CHUNK.run(queue);
+        if (addChunk != null) {
-            CURRENT_ADD_CHUNK = null;
+            addChunk.run(queue);
+            addChunks.remove(loc);
             return true;
         }
         return false;