cancel block place/break event during preparation time

src/main/java/me/roinujnosde/titansbattle/TitansBattle.java

@@ -201,6 +201,7 @@ private void registerEvents() {
         pm.registerEvents(new PlayerJoinListener(), this);
         pm.registerEvents(new PlayerDeathListener(), this);
         pm.registerEvents(new EntityDamageListener(), this);
+        pm.registerEvents(new BlockUpdateListener(), this);
         pm.registerEvents(new PlayerRespawnListener(), this);
         pm.registerEvents(new PlayerTeleportListener(), this);
     }

src/main/java/me/roinujnosde/titansbattle/listeners/BlockUpdateListener.java

@@ -0,0 +1,54 @@
+package me.roinujnosde.titansbattle.listeners;
+
+import me.roinujnosde.titansbattle.TitansBattle;
+import me.roinujnosde.titansbattle.games.Game;
+import me.roinujnosde.titansbattle.managers.DatabaseManager;
+import me.roinujnosde.titansbattle.managers.GameManager;
+import me.roinujnosde.titansbattle.types.Warrior;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.block.BlockBreakEvent;
+import org.bukkit.event.block.BlockPlaceEvent;
+
+public class BlockUpdateListener implements Listener {
+
+    private final TitansBattle plugin = TitansBattle.getInstance();
+    private final GameManager gm;
+    private final DatabaseManager dm;
+
+    public BlockUpdateListener() {
+        gm = plugin.getGameManager();
+        dm = plugin.getDatabaseManager();
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST)
+    public void onBreak(BlockBreakEvent event) {
+        if (shouldCancel(event.getPlayer())) {
+            event.setCancelled(true);
+        }
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST)
+    public void onPlace(BlockPlaceEvent event) {
+        if (shouldCancel(event.getPlayer())) {
+            event.setCancelled(true);
+        }
+    }
+
+    private boolean shouldCancel(Player player) {
+        Game game = gm.getCurrentGame().orElse(null);
+        if (game == null) {
+            return false;
+        }
+
+        Warrior warrior = dm.getWarrior(player);
+        if (!game.isParticipant(warrior)) {
+            return false;
+        }
+
+        return !game.isInBattle(warrior);
+    }
+
+}