cria métodos para mostrar todas as listas de jogos do BD ou exibir uma lista específica com base no seu ID

Author: GabrielTorelo

src/main/java/com/gabriel_torelo/game_list/services/GameListService.java

@@ -0,0 +1,30 @@
+package com.gabriel_torelo.game_list.services;
+
+import java.util.List;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import com.gabriel_torelo.game_list.dto.GameListDTO;
+import com.gabriel_torelo.game_list.entities.GameList;
+import com.gabriel_torelo.game_list.repositories.GameListRepository;
+
+@Service
+public class GameListService {
+    
+    @Autowired
+    private GameListRepository gamelistRepository;
+
+    @Transactional(readOnly = true)
+    public List<GameListDTO> readAll() {
+        List<GameList> rGameLists = gamelistRepository.findAll();
+
+        return rGameLists.stream().map(gameListEntity -> new GameListDTO(gameListEntity)).toList();
+    }
+
+    @Transactional(readOnly = true)
+    public GameListDTO readID(Long id) {
+        GameList rGameList = gamelistRepository.findById(id).get();
+
+        return new GameListDTO(rGameList);
+    }
+}