Add preload chunk version

Author: wode490390

src/main/java/cn/nukkit/level/Level.java

@@ -251,7 +251,7 @@ public int size() {
 
     private final Long2ObjectMap<Int2ObjectMap<Player>> subChunkSendQueue = new Long2ObjectOpenHashMap<>();
 
-    private final ConcurrentMap<Long, Int2ObjectMap<Player>> chunkSendQueue = new ConcurrentHashMap<>();
+    private final Long2ObjectMap<Int2ObjectMap<Player>> chunkSendQueue = new Long2ObjectOpenHashMap<>();
     private final LongSet chunkSendTasks = new LongOpenHashSet();
 
     private final Long2BooleanMap chunkPopulationQueue = new Long2BooleanOpenHashMap();
@@ -3431,10 +3431,10 @@ private void sendChunk(int x, int z, long index, int subChunkCount, ChunkBlobCac
 
     private void processChunkRequest() {
         this.timings.syncChunkSendTimer.startTiming();
-        Iterator<Map.Entry<Long, Int2ObjectMap<Player>>> it = this.chunkSendQueue.entrySet().iterator();
+        Iterator<Long2ObjectMap.Entry<Int2ObjectMap<Player>>> it = this.chunkSendQueue.long2ObjectEntrySet().iterator();
         while (it.hasNext()) {
-            Map.Entry<Long, Int2ObjectMap<Player>> entry = it.next();
-            long index = entry.getKey();
+            Long2ObjectMap.Entry<Int2ObjectMap<Player>> entry = it.next();
+            long index = entry.getLongKey();
             if (!this.chunkSendTasks.add(index)) {
                 continue;
             }
@@ -3534,7 +3534,7 @@ private void processChunkRequest() {
                     }
 
                     if (!requestFullChunk) {
-                        this.chunkSendQueue.remove(index);
+                        it.remove();
                         this.chunkSendTasks.remove(index);
 
                         if (!requestSubChunks) {

src/main/java/cn/nukkit/level/format/generic/ChunkRequestTask.java

@@ -36,7 +36,6 @@
 import java.nio.file.Paths;
 import java.nio.file.StandardOpenOption;
 import java.util.Arrays;
-import java.util.Collections;
 import java.util.EnumMap;
 import java.util.EnumSet;
 import java.util.List;
@@ -48,6 +47,8 @@
 
 @Log4j2
 public class ChunkRequestTask extends AsyncTask<Void> {
+    private static final EnumSet<StaticVersion> PRELOAD_VERSIONS = EnumSet.noneOf(StaticVersion.class);
+
     private static final byte[] EMPTY = new byte[0];
 
     public static final int PADDING_SUB_CHUNK_COUNT = 4;
@@ -119,8 +120,8 @@ public ChunkRequestTask(Chunk chunk) {
         x = chunk.getX();
         z = chunk.getZ();
         level = chunk.getProvider().getLevel();
-        Set<StaticVersion> requestedVersions = level.getRequestChunkVersions().keySet();
-        this.requestedVersions = requestedVersions.isEmpty() ? Collections.emptySet() : EnumSet.copyOf(requestedVersions);
+        this.requestedVersions = EnumSet.copyOf(PRELOAD_VERSIONS);
+        this.requestedVersions.addAll(level.getRequestChunkVersions().keySet());
         timestamp = chunk.getChanges();
     }
 
@@ -492,4 +493,8 @@ private static int toValidBiome(int id) {
         // make sure we aren't sending bogus biomes - the 1.18.0 client crashes if we do this
         return name == null ? EnumBiome.OCEAN.id : id;
     }
+
+    public static boolean addPreloadVersion(StaticVersion version) {
+        return PRELOAD_VERSIONS.add(version);
+    }
 }