Refactor ScriptManager to schedule loading and unloading of scripts on the Minecraft server's tick thread

src/main/java/net/jstom/script/ScriptManager.java

@@ -1,5 +1,6 @@
 package net.jstom.script;
 
+import net.minestom.server.MinecraftServer;
 import org.graalvm.polyglot.Context;
 import org.graalvm.polyglot.HostAccess;
 import org.graalvm.polyglot.Source;
@@ -8,6 +9,7 @@ import java.io.File;
 import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.ArrayList;
 
 public class ScriptManager {
     private final File scriptsDir;
@@ -18,6 +20,10 @@ public class ScriptManager {
     }
 
     public void load() {
+        MinecraftServer.getSchedulerManager().scheduleNextTick(this::doLoad);
+    }
+
+    private void doLoad() {
         if (!scriptsDir.exists()) {
             scriptsDir.mkdirs();
         }
@@ -30,13 +36,14 @@ public class ScriptManager {
         }
     }
 
-    public void loadScript(File file) {
+    private void loadScript(File file) {
         String fileName = file.getName();
         unloadScript(fileName); // Ensure clean slate if reloading
 
         System.out.println("[JStom] Loading script: " + fileName);
         
         ScriptApi api = new ScriptApi();
+        // Context created on the Tick Thread (because loadScript is called from scheduled tasks)
         Context context = Context.newBuilder("js")
                 .allowHostAccess(HostAccess.ALL)
                 .allowHostClassLookup(s -> true)
@@ -63,7 +70,7 @@ public class ScriptManager {
         }
     }
 
-    public void unloadScript(String fileName) {
+    private void unloadScript(String fileName) {
         ScriptEnv env = loadedScripts.remove(fileName);
         if (env != null) {
             env.api.cleanup();
@@ -73,24 +80,32 @@ public class ScriptManager {
     }
 
     public void unload() {
+        MinecraftServer.getSchedulerManager().scheduleNextTick(this::doUnload);
+    }
+
+    private void doUnload() {
         // Copy keys to avoid ConcurrentModificationException
-        for (String fileName : new java.util.ArrayList<>(loadedScripts.keySet())) {
+        for (String fileName : new ArrayList<>(loadedScripts.keySet())) {
             unloadScript(fileName);
         }
     }
 
     public void reload() {
-        unload();
-        load();
+        MinecraftServer.getSchedulerManager().scheduleNextTick(() -> {
+            doUnload();
+            doLoad();
+        });
     }
     
     public void reload(String fileName) {
-        File file = new File(scriptsDir, fileName);
-        if (file.exists()) {
-            loadScript(file);
-        } else {
-            System.err.println("[JStom] File not found: " + fileName);
-        }
+        MinecraftServer.getSchedulerManager().scheduleNextTick(() -> {
+            File file = new File(scriptsDir, fileName);
+            if (file.exists()) {
+                loadScript(file);
+            } else {
+                System.err.println("[JStom] File not found: " + fileName);
+            }
+        });
     }
 
     private static class ScriptEnv {
@@ -104,5 +119,4 @@ public class ScriptManager {
             this.file = file;
         }
     }
-}
-
+}