import cn.nukkit.level.format.Chunk; //导入依赖的package包/类
private void processChunkRequest() {
    if (!this.chunkSendQueue.isEmpty()) {
        this.timings.syncChunkSendTimer.startTiming();
        for (String index : new ArrayList<>(this.chunkSendQueue.keySet())) {
            if (this.chunkSendTasks.containsKey(index)) {
                continue;
            }
            Chunk.Entry chunkEntry = Level.getChunkXZ(index);
            int x = chunkEntry.chunkX;
            int z = chunkEntry.chunkZ;
            this.chunkSendTasks.put(index, true);
            if (this.chunkCache.containsKey(index)) {
                this.sendChunkFromCache(x, z);
                continue;
            }
            this.timings.syncChunkSendPrepareTimer.startTiming();
            AsyncTask task = this.provider.requestChunkTask(x, z);
            if (task != null) {
                this.server.getScheduler().scheduleAsyncTask(task);
            }
            this.timings.syncChunkSendPrepareTimer.stopTiming();
        }
        this.timings.syncChunkSendTimer.stopTiming();
    }
}
 

import cn.nukkit.level.format.Chunk; //导入依赖的package包/类
@Override
protected boolean switchLevel(Level targetLevel) {
    Level oldLevel = this.level;
    if (super.switchLevel(targetLevel)) {
        for (String index : new ArrayList<>(this.usedChunks.keySet())) {
            Chunk.Entry chunkEntry = Level.getChunkXZ(index);
            int chunkX = chunkEntry.chunkX;
            int chunkZ = chunkEntry.chunkZ;
            this.unloadChunk(chunkX, chunkZ, oldLevel);
        }

        this.usedChunks = new HashMap<>();
        SetTimePacket pk = new SetTimePacket();
        pk.time = this.level.getTime();
        pk.started = !this.level.stopTime;
        this.dataPacket(pk);
        return true;
    }
    return false;
}
 

import cn.nukkit.level.format.Chunk; //导入依赖的package包/类
public void doChunkGarbageCollection() {
    this.timings.doChunkGC.startTiming();
    // remove all invaild block entities.
    List<BlockEntity> toClose = new ArrayList<>();
    for (BlockEntity anBlockEntity : blockEntities.values()) {
        if (anBlockEntity == null)
            continue;
        if (anBlockEntity.isBlockEntityValid())
            continue;
        toClose.add(anBlockEntity);
    }
    for (BlockEntity be : toClose.toArray(new BlockEntity[toClose.size()])) {
        be.close();
    }

    for (String index : this.chunks.keySet()) {

        if (!this.unloadQueue.containsKey(index)) {
            Chunk.Entry chunkEntry = Level.getChunkXZ(index);
            int X = chunkEntry.chunkX;
            int Z = chunkEntry.chunkZ;
            if (!this.isSpawnChunk(X, Z)) {
                this.unloadChunkRequest(X, Z, true);
            }
        }
    }

    for (FullChunk chunk : new ArrayList<>(this.provider.getLoadedChunks().values())) {
        if (!this.chunks.containsKey(Level.chunkHash(chunk.getX(), chunk.getZ()))) {
            this.provider.unloadChunk(chunk.getX(), chunk.getZ(), false);
        }
    }

    this.provider.doGarbageCollection();
    this.timings.doChunkGC.stopTiming();
}
 

import cn.nukkit.level.format.Chunk; //导入依赖的package包/类
public void unloadChunks(boolean force) {
    if (!this.unloadQueue.isEmpty()) {
        int maxUnload = 96;
        long now = System.currentTimeMillis();

        for (String index : new ArrayList<>(this.unloadQueue.keySet())) {
            long time = this.unloadQueue.get(index);

            Chunk.Entry chunkEntry = Level.getChunkXZ(index);
            int X = chunkEntry.chunkX;
            int Z = chunkEntry.chunkZ;

            if (!force) {
                if (maxUnload <= 0) {
                    break;
                } else if (time > (now - 30000)) {
                    continue;
                }
            }

            if (this.unloadChunk(X, Z, true)) {
                this.unloadQueue.remove(index);
                --maxUnload;
            }
        }
    }
}
 

import cn.nukkit.level.format.Chunk; //导入依赖的package包/类
public void unloadChunks(boolean force) {
    if (!this.unloadQueue.isEmpty()) {
        int maxUnload = 96;
        long now = System.currentTimeMillis();

        for (Iterator<String> it = new ArrayList<>(this.unloadQueue.keySet()).iterator(); it.hasNext(); ) {
            String index = it.next();
            long time = this.unloadQueue.get(index);

            Chunk.Entry chunkEntry = Level.getChunkXZ(index);
            int X = chunkEntry.chunkX;
            int Z = chunkEntry.chunkZ;

            if (!force) {
                if (maxUnload <= 0) {
                    break;
                } else if (time > (now - 30000)) {
                    continue;
                }
            }

            if (this.unloadChunk(X, Z, true)) {
                this.unloadQueue.remove(index);
                --maxUnload;
            }
        }
    }
}
 

import cn.nukkit.level.format.Chunk; //导入依赖的package包/类
public static Chunk.Entry getChunkXZ(long hash) {
    return new Chunk.Entry(getHashX(hash), getHashZ(hash));
}
 

import cn.nukkit.level.format.Chunk; //导入依赖的package包/类
@Override
public boolean onUpdate() {
    if (this.closed) {
        return false;
    }

    this.timing.startTiming();

    if (!(this.chunk instanceof Chunk)) {
        return false;
    }

    if (!(this.canUpdate())) {
        return false;
    }

    if (this.namedTag.getInt("Delay") <= 0) {
        int success = 0;
        NukkitRandom random = new NukkitRandom();
        for (int i = 0; i < this.namedTag.getInt("SpawnCount"); ++i) {
            Vector3 pos = this.add(
                    this.getRandomSpawn(), 
                    NukkitMath.randomRange(random, -1, 1), 
                    this.getRandomSpawn());
            Block target = this.getLevel().getBlock(pos);
            Block ground = target.down();
            if (target.getId() == Block.AIR && ground.isSolid()) {
                ++success;
                CompoundTag nbt = new CompoundTag()
                        .putList(new ListTag<DoubleTag>("Pos")
                                .add(new DoubleTag("", pos.x))
                                .add(new DoubleTag("", pos.y))
                                .add(new DoubleTag("", pos.z)))
                        .putList(new ListTag<DoubleTag>("Motion")
                                .add(new DoubleTag("", 0))
                                .add(new DoubleTag("", 0))
                                .add(new DoubleTag("", 0)))
                        .putList(new ListTag<FloatTag>("Rotation")
                                .add(new FloatTag("", (float) Math.random() * 360))
                                .add(new FloatTag("", (float) 0)));

                Entity entity = Entity.createEntity(this.getNetworkId(), this.chunk, nbt);
                entity.spawnToAll();
            }
        }

        if (success > 0) {
            this.namedTag.putInt("Delay", NukkitMath.randomRange(random, this.namedTag.getInt("MinSpawnDelay"), this.namedTag.getInt("MaxSpawnDelay")));
        }

    } else {
        this.namedTag.putInt("Delay", this.namedTag.getInt("Delay") - 1);
    }

    this.timing.stopTiming();

    return true;
}
 

import cn.nukkit.level.format.Chunk; //导入依赖的package包/类
public static Chunk.Entry getChunkXZ(String hash) {
    String[] h = hash.split(":");
    return new Chunk.Entry(Integer.valueOf(h[0]), Integer.valueOf(h[1]));
}
 

import cn.nukkit.level.format.Chunk; //导入依赖的package包/类
protected void sendNextChunk() {
    if (!this.connected) {
        return;
    }

    Timings.playerChunkSendTimer.startTiming();

    int count = 0;

    List<Map.Entry<String, Integer>> entryList = new ArrayList<>(this.loadQueue.entrySet());
    entryList.sort(new Comparator<Map.Entry<String, Integer>>() {
        @Override
        public int compare(Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2) {
            return o1.getValue() - o2.getValue();
        }
    });

    for (Map.Entry<String, Integer> entry : entryList) {
        String index = entry.getKey();
        if (count >= this.chunksPerTick) {
            break;
        }

        Chunk.Entry chunkEntry = Level.getChunkXZ(index);
        int chunkX = chunkEntry.chunkX;
        int chunkZ = chunkEntry.chunkZ;

        ++count;

        this.usedChunks.put(index, false);
        this.level.registerChunkLoader(this, chunkX, chunkZ, false);

        if (!this.level.populateChunk(chunkX, chunkZ)) {
            if (this.spawned && this.teleportPosition == null) {
                continue;
            } else {
                break;
            }
        }

        this.loadQueue.remove(index);

        PlayerChunkRequestEvent ev = new PlayerChunkRequestEvent(this, chunkX, chunkZ);
        this.server.getPluginManager().callEvent(ev);
        if (!ev.isCancelled()) {
            this.level.requestChunk(chunkX, chunkZ, this);
        }
    }

    if (this.chunkLoadCount >= this.spawnThreshold && !this.spawned && this.teleportPosition == null) {
        this.doFirstSpawn();
    }
    Timings.playerChunkSendTimer.stopTiming();
}