Refactor game server managers to systems

src/main/java/emu/grasscutter/game/expedition/ExpeditionSystem.java

@@ -0,0 +1,48 @@
+package emu.grasscutter.game.expedition;
+
+import com.google.gson.reflect.TypeToken;
+import emu.grasscutter.Grasscutter;
+import emu.grasscutter.data.DataLoader;
+import emu.grasscutter.server.game.BaseGameSystem;
+import emu.grasscutter.server.game.GameServer;
+import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
+import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+
+import java.io.FileReader;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.util.Collection;
+import java.util.List;
+
+import static emu.grasscutter.Configuration.*;
+
+public class ExpeditionSystem extends BaseGameSystem {
+    private final Int2ObjectMap<List<ExpeditionRewardDataList>> expeditionRewardData;
+
+    public ExpeditionSystem(GameServer server) {
+        super(server);
+        this.expeditionRewardData = new Int2ObjectOpenHashMap<>();
+        this.load();
+    }
+    
+    public Int2ObjectMap<List<ExpeditionRewardDataList>> getExpeditionRewardDataList() { 
+        return expeditionRewardData; 
+    }
+
+    public synchronized void load() {
+        try (Reader fileReader = new InputStreamReader(DataLoader.load("ExpeditionReward.json"))) {
+            getExpeditionRewardDataList().clear();
+            List<ExpeditionRewardInfo> banners = Grasscutter.getGsonFactory().fromJson(fileReader, TypeToken.getParameterized(Collection.class, ExpeditionRewardInfo.class).getType());
+            if(banners.size() > 0) {
+                for (ExpeditionRewardInfo di : banners) {
+                    getExpeditionRewardDataList().put(di.getExpId(), di.getExpeditionRewardDataList());
+                }
+                Grasscutter.getLogger().debug("Expedition reward successfully loaded.");
+            } else {
+                Grasscutter.getLogger().error("Unable to load expedition reward. Expedition reward size is 0.");
+            }
+        } catch (Exception e) {
+            Grasscutter.getLogger().error("Unable to load expedition reward.", e);
+        }
+    }
+}