Added Chunk#setReadOnly and Chunk#isReadOnly

src/main/java/net/minestom/server/instance/Chunk.java

@@ -63,6 +63,7 @@ public abstract class Chunk implements Viewable, DataContainer {
 
     // Options
     private final boolean shouldGenerate;
+    private boolean readOnly;
 
     // Packet cache
     private volatile boolean enableCachePacket;
@@ -277,6 +278,24 @@ public abstract class Chunk implements Viewable, DataContainer {
         return shouldGenerate;
     }
 
+    /**
+     * Gets if this chunk is read-only.
+     *
+     * @return true if the chunk is read-only
+     */
+    public boolean isReadOnly() {
+        return readOnly;
+    }
+
+    /**
+     * Changes the read state of the chunk.
+     *
+     * @param readOnly true to make the chunk read-only, false otherwise
+     */
+    public void setReadOnly(boolean readOnly) {
+        this.readOnly = readOnly;
+    }
+
     /**
      * Gets if this chunk automatically cache the latest {@link ChunkDataPacket} version.
      * <p>

src/main/java/net/minestom/server/instance/InstanceContainer.java

@@ -160,6 +160,10 @@ public class InstanceContainer extends Instance {
      * @param data         the {@link Data}, null if none
      */
     private void UNSAFE_setBlock(Chunk chunk, int x, int y, int z, short blockStateId, CustomBlock customBlock, Data data) {
+        if (chunk.isReadOnly()) {
+            return;
+        }
+
         synchronized (chunk) {
 
             final boolean isCustomBlock = customBlock != null;
@@ -342,6 +346,11 @@ public class InstanceContainer extends Instance {
 
         final Chunk chunk = getChunkAt(blockPosition);
 
+        // Cancel if the chunk is read-only
+        if (chunk.isReadOnly()) {
+            return false;
+        }
+
         // Chunk unloaded, stop here
         if (!ChunkUtils.isLoaded(chunk))
             return false;

src/main/java/net/minestom/server/instance/StaticChunk.java

@@ -27,6 +27,7 @@ public class StaticChunk extends Chunk {
     public StaticChunk(Instance instance, Biome[] biomes, int chunkX, int chunkZ, BlockProvider blockProvider) {
         super(instance, biomes, chunkX, chunkZ, false);
         this.blockProvider = blockProvider;
+        setReadOnly(true);
     }
 
     @Override

src/main/java/net/minestom/server/listener/BlockPlacementListener.java

@@ -80,46 +80,50 @@ public class BlockPlacementListener {
         boolean refreshChunk = false;
 
         if (material.isBlock()) {
-            final Block block = material.getBlock();
+            if (!chunk.isReadOnly()) {
-            final Set<Entity> entities = instance.getChunkEntities(chunk);
+                final Block block = material.getBlock();
-            // Check if the player is trying to place a block in an entity
+                final Set<Entity> entities = instance.getChunkEntities(chunk);
-            boolean intersect = false;
+                // Check if the player is trying to place a block in an entity
-            if (block.isSolid()) {
+                boolean intersect = false;
-                for (Entity entity : entities) {
+                if (block.isSolid()) {
-                    intersect = entity.getBoundingBox().intersect(blockPosition);
+                    for (Entity entity : entities) {
-                    if (intersect)
+                        intersect = entity.getBoundingBox().intersect(blockPosition);
-                        break;
+                        if (intersect)
-                }
+                            break;
-            }
-
-            if (!intersect) {
-                // BlockPlacementRule check
-                final BlockManager blockManager = MinecraftServer.getBlockManager();
-                final BlockPlacementRule blockPlacementRule = blockManager.getBlockPlacementRule(block);
-                final short blockStateId = blockPlacementRule == null ? block.getBlockId() :
-                        blockPlacementRule.blockPlace(instance, block, blockFace, player);
-
-                PlayerBlockPlaceEvent playerBlockPlaceEvent = new PlayerBlockPlaceEvent(player, blockStateId, (short) 0, blockPosition, packet.hand);
-                playerBlockPlaceEvent.consumeBlock(player.getGameMode() != GameMode.CREATIVE);
-
-                // BlockPlacementRule check
-                final boolean canPlace = blockPlacementRule == null || blockPlacementRule.canPlace(instance, blockPosition);
-
-                player.callEvent(PlayerBlockPlaceEvent.class, playerBlockPlaceEvent);
-                if (!playerBlockPlaceEvent.isCancelled() && canPlace) {
-                    final short customBlockId = playerBlockPlaceEvent.getCustomBlockId();
-                    if (customBlockId != 0) {
-                        instance.setSeparateBlocks(blockPosition.getX(), blockPosition.getY(), blockPosition.getZ(), playerBlockPlaceEvent.getBlockStateId(), playerBlockPlaceEvent.getCustomBlockId());
-                    } else {
-                        instance.setBlockStateId(blockPosition.getX(), blockPosition.getY(), blockPosition.getZ(), playerBlockPlaceEvent.getBlockStateId());
                     }
-                    if (playerBlockPlaceEvent.doesConsumeBlock()) {
+                }
-                        // Consume the block in the player's hand
-                        final ItemStack newUsedItem = usedItem.consume(1);
 
-                        if (newUsedItem != null) {
+                if (!intersect) {
-                            playerInventory.setItemInHand(hand, newUsedItem);
+                    // BlockPlacementRule check
+                    final BlockManager blockManager = MinecraftServer.getBlockManager();
+                    final BlockPlacementRule blockPlacementRule = blockManager.getBlockPlacementRule(block);
+                    final short blockStateId = blockPlacementRule == null ? block.getBlockId() :
+                            blockPlacementRule.blockPlace(instance, block, blockFace, player);
+
+                    PlayerBlockPlaceEvent playerBlockPlaceEvent = new PlayerBlockPlaceEvent(player, blockStateId, (short) 0, blockPosition, packet.hand);
+                    playerBlockPlaceEvent.consumeBlock(player.getGameMode() != GameMode.CREATIVE);
+
+                    // BlockPlacementRule check
+                    final boolean canPlace = blockPlacementRule == null || blockPlacementRule.canPlace(instance, blockPosition);
+
+                    player.callEvent(PlayerBlockPlaceEvent.class, playerBlockPlaceEvent);
+                    if (!playerBlockPlaceEvent.isCancelled() && canPlace) {
+                        final short customBlockId = playerBlockPlaceEvent.getCustomBlockId();
+                        if (customBlockId != 0) {
+                            instance.setSeparateBlocks(blockPosition.getX(), blockPosition.getY(), blockPosition.getZ(), playerBlockPlaceEvent.getBlockStateId(), playerBlockPlaceEvent.getCustomBlockId());
+                        } else {
+                            instance.setBlockStateId(blockPosition.getX(), blockPosition.getY(), blockPosition.getZ(), playerBlockPlaceEvent.getBlockStateId());
                         }
+                        if (playerBlockPlaceEvent.doesConsumeBlock()) {
+                            // Consume the block in the player's hand
+                            final ItemStack newUsedItem = usedItem.consume(1);
+
+                            if (newUsedItem != null) {
+                                playerInventory.setItemInHand(hand, newUsedItem);
+                            }
+                        }
+                    } else {
+                        refreshChunk = true;
                     }
                 } else {
                     refreshChunk = true;