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

@@ -80,6 +80,7 @@ public class BlockPlacementListener {
         boolean refreshChunk = false;
 
         if (material.isBlock()) {
+            if (!chunk.isReadOnly()) {
                 final Block block = material.getBlock();
                 final Set<Entity> entities = instance.getChunkEntities(chunk);
                 // Check if the player is trying to place a block in an entity
@@ -127,6 +128,9 @@ public class BlockPlacementListener {
                 } else {
                     refreshChunk = true;
                 }
+            } else {
+                refreshChunk = true;
+            }
         } else {
             // Player didn't try to place a block but interacted with one
             PlayerUseItemOnBlockEvent event = new PlayerUseItemOnBlockEvent(player, hand, usedItem, blockPosition, direction);