Create lifecycle hooks in MapHandler and Entity

api/src/main/java/com/bartlomiejpluta/base/api/game/entity/Entity.java

@@ -1,5 +1,6 @@
 package com.bartlomiejpluta.base.api.game.entity;
 
+import com.bartlomiejpluta.base.api.game.map.layer.object.ObjectLayer;
 import com.bartlomiejpluta.base.api.internal.logic.Updatable;
 import com.bartlomiejpluta.base.api.internal.object.Placeable;
 import com.bartlomiejpluta.base.api.internal.render.Renderable;
@@ -31,4 +32,8 @@ public interface Entity extends Placeable, Renderable, Updatable {
    int manhattanDistance(Entity other);
 
    Direction getDirectionTowards(Entity target);
+
+   void onAdd(ObjectLayer layer);
+
+   void onRemove(ObjectLayer layer);
 }

api/src/main/java/com/bartlomiejpluta/base/api/game/entity/EntityDelegate.java

@@ -1,6 +1,7 @@
 package com.bartlomiejpluta.base.api.game.entity;
 
 import com.bartlomiejpluta.base.api.game.camera.Camera;
+import com.bartlomiejpluta.base.api.game.map.layer.object.ObjectLayer;
 import com.bartlomiejpluta.base.api.game.window.Window;
 import com.bartlomiejpluta.base.api.internal.object.Placeable;
 import com.bartlomiejpluta.base.api.internal.render.ShaderManager;
@@ -9,7 +10,7 @@ import org.joml.Vector2f;
 import org.joml.Vector2i;
 
 public abstract class EntityDelegate implements Entity {
-   private final Entity entity;
+   protected final Entity entity;
 
    protected EntityDelegate(Entity entity) {
       this.entity = entity;
@@ -160,6 +161,16 @@ public abstract class EntityDelegate implements Entity {
       return entity.getModelMatrix();
    }
 
+   @Override
+   public void onAdd(ObjectLayer layer) {
+      entity.onAdd(layer);
+   }
+
+   @Override
+   public void onRemove(ObjectLayer layer) {
+      entity.onRemove(layer);
+   }
+
    @Override
    public void update(float dt) {
       entity.update(dt);

api/src/main/java/com/bartlomiejpluta/base/api/game/map/handler/MapHandler.java

@@ -5,7 +5,9 @@ import com.bartlomiejpluta.base.api.game.map.model.GameMap;
 import com.bartlomiejpluta.base.api.game.window.Window;
 
 public interface MapHandler {
-   void init(Context context, GameMap map);
+   void onCreate(Context context, GameMap map);
+
+   void onOpen(Context context, GameMap map);
 
    void input(Window window);
 

api/src/main/java/com/bartlomiejpluta/base/api/game/map/layer/object/ObjectLayer.java

@@ -12,6 +12,8 @@ public interface ObjectLayer extends Layer {
 
    void removeEntity(Entity entity);
 
+   void clearEntities();
+
    List<Entity> getEntities();
 
    void registerRule(Rule rule);

editor/src/main/resources/java_templates/map_handler.ftl

@@ -8,12 +8,12 @@ import com.bartlomiejpluta.base.api.game.window.Window;
 public class ${className} implements MapHandler {
 
    @Override
-   public void init(Context context, GameMap map) {
+   public void onCreate(Context context, GameMap map) {
 
    }
 
    @Override
-   public void input(Window window) {
+   public void onOpen(Context context, GameMap map) {
 
    }
 

engine/src/main/java/com/bartlomiejpluta/base/engine/project/loader/DefaultClassLoader.java

@@ -1,18 +1,18 @@
 package com.bartlomiejpluta.base.engine.project.loader;
 
-import com.bartlomiejpluta.base.engine.error.AppException;
+import lombok.SneakyThrows;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Component;
 
+@Slf4j
 @Component
 public class DefaultClassLoader implements ClassLoader {
 
+   @SneakyThrows
    @Override
    @SuppressWarnings("unchecked")
    public <T> Class<T> loadClass(String className) {
-      try {
+      log.info("Loading [{}] class", className);
       return (Class<T>) getClass().getClassLoader().loadClass(className);
-      } catch (ClassNotFoundException e) {
-         throw new AppException(e);
-      }
    }
 }

engine/src/main/java/com/bartlomiejpluta/base/engine/project/model/RenderableContext.java

@@ -45,11 +45,9 @@ public class RenderableContext implements Context, Updatable, Renderable {
    @Override
    public void openMap(String mapUid) {
       map = mapManager.loadObject(mapUid);
+      mapHandler = mapManager.loadHandler(this, mapUid);
 
-      var handlerClass = classLoader.<MapHandler>loadClass(map.getHandler());
+      mapHandler.onOpen(this, map);
-      mapHandler = handlerClass.getConstructor().newInstance();
-
-      mapHandler.init(this, map);
    }
 
    @Override

engine/src/main/java/com/bartlomiejpluta/base/engine/world/entity/model/DefaultEntity.java

@@ -2,6 +2,7 @@ package com.bartlomiejpluta.base.engine.world.entity.model;
 
 import com.bartlomiejpluta.base.api.game.entity.Direction;
 import com.bartlomiejpluta.base.api.game.entity.Entity;
+import com.bartlomiejpluta.base.api.game.map.layer.object.ObjectLayer;
 import com.bartlomiejpluta.base.engine.core.gl.object.material.Material;
 import com.bartlomiejpluta.base.engine.core.gl.object.mesh.Mesh;
 import com.bartlomiejpluta.base.engine.util.math.MathUtil;
@@ -93,6 +94,16 @@ public class DefaultEntity extends MovableSprite implements Entity {
       return Direction.ofVector(new Vector2i(target.getCoordinates()).sub(getCoordinates()));
    }
 
+   @Override
+   public void onAdd(ObjectLayer layer) {
+      // Do nothing
+   }
+
+   @Override
+   public void onRemove(ObjectLayer layer) {
+      // Do nothing
+   }
+
    public DefaultEntity(Mesh mesh, Material material, EntitySpriteConfiguration configuration) {
       super(mesh, material);
       this.defaultSpriteColumn = configuration.getDefaultSpriteColumn();

engine/src/main/java/com/bartlomiejpluta/base/engine/world/map/layer/object/DefaultObjectLayer.java

@@ -55,15 +55,22 @@ public class DefaultObjectLayer implements ObjectLayer {
 
    @Override
    public void addEntity(Entity entity) {
+      entity.onAdd(this);
       entity.setStepSize(stepSize.x, stepSize.y);
       entities.add(entity);
    }
 
    @Override
    public void removeEntity(Entity entity) {
+      entity.onRemove(this);
       entities.remove(entity);
    }
 
+   @Override
+   public void clearEntities() {
+      entities.clear();
+   }
+
    @Override
    public void setPassageAbility(int row, int column, PassageAbility passageAbility) {
       passageMap[row][column] = passageAbility;

engine/src/main/java/com/bartlomiejpluta/base/engine/world/map/manager/DefaultMapManager.java

@@ -1,11 +1,15 @@
 package com.bartlomiejpluta.base.engine.world.map.manager;
 
+import com.bartlomiejpluta.base.api.game.context.Context;
+import com.bartlomiejpluta.base.api.game.map.handler.MapHandler;
 import com.bartlomiejpluta.base.engine.error.AppException;
 import com.bartlomiejpluta.base.engine.project.config.ProjectConfiguration;
+import com.bartlomiejpluta.base.engine.project.loader.ClassLoader;
 import com.bartlomiejpluta.base.engine.world.map.asset.GameMapAsset;
 import com.bartlomiejpluta.base.engine.world.map.model.DefaultGameMap;
 import com.bartlomiejpluta.base.engine.world.map.serial.MapDeserializer;
 import lombok.RequiredArgsConstructor;
+import lombok.SneakyThrows;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
@@ -19,8 +23,10 @@ import java.util.Map;
 public class DefaultMapManager implements MapManager {
    private final Map<String, DefaultGameMap> maps = new HashMap<>();
    private final Map<String, GameMapAsset> assets = new HashMap<>();
+   private final Map<String, MapHandler> handlers = new HashMap<>();
    private final MapDeserializer mapDeserializer;
    private final ProjectConfiguration configuration;
+   private final ClassLoader classLoader;
 
    @Override
    public void registerAsset(GameMapAsset asset) {
@@ -52,4 +58,34 @@ public class DefaultMapManager implements MapManager {
    public void cleanUp() {
       log.info("There is nothing to clean up here");
    }
+
+   @SneakyThrows
+   @Override
+   public MapHandler loadHandler(Context context, String uid) {
+      var handler = handlers.get(uid);
+
+      if (handler == null) {
+         var asset = assets.get(uid);
+
+         if (asset == null) {
+            throw new AppException("The map asset with UID: [%s] does not exist", uid);
+         }
+
+         var map = maps.get(uid);
+
+         if (map == null) {
+            throw new AppException("The map asset with UID: [%s] has not been loaded yet", uid);
+         }
+
+         var handlerClassName = map.getHandler();
+         log.info("Creating new handler: [{}] for the map with ID: [{}]", handlerClassName, uid);
+         var handlerClass = classLoader.<MapHandler>loadClass(handlerClassName);
+         handler = handlerClass.getConstructor().newInstance();
+         handlers.put(uid, handler);
+
+         handler.onCreate(context, map);
+      }
+
+      return handler;
+   }
 }

engine/src/main/java/com/bartlomiejpluta/base/engine/world/map/manager/MapManager.java

@@ -1,9 +1,12 @@
 package com.bartlomiejpluta.base.engine.world.map.manager;
 
+import com.bartlomiejpluta.base.api.game.context.Context;
+import com.bartlomiejpluta.base.api.game.map.handler.MapHandler;
 import com.bartlomiejpluta.base.api.internal.gc.Cleanable;
 import com.bartlomiejpluta.base.engine.common.manager.AssetManager;
 import com.bartlomiejpluta.base.engine.world.map.asset.GameMapAsset;
 import com.bartlomiejpluta.base.engine.world.map.model.DefaultGameMap;
 
 public interface MapManager extends AssetManager<GameMapAsset, DefaultGameMap>, Cleanable {
+   MapHandler loadHandler(Context context, String mapUid);
 }