finish client & server communicate

finish database

api/src/main/java/cc/maxmc/msm/api/MultiServerManAPI.java

@@ -9,13 +9,13 @@ import java.util.List;
 @SuppressWarnings("unused") // API
 public interface MultiServerManAPI {
     @NotNull
-    ServerInfo getServer(@NotNull String type, @NotNull List<ProxiedPlayer> players);
+    ServerInfo getServer(@NotNull String type, @NotNull List<String> players);
 
     void informEnd(int id);
 
     @NotNull
-    ServerInfo getPlayerServer(@NotNull ProxiedPlayer player);
+    ServerInfo getPlayerServer(@NotNull String player);
 
-    Boolean containPlayer(@NotNull ProxiedPlayer player);
+    Boolean containPlayer(@NotNull String player);
 
 }

api/src/main/java/cc/maxmc/msm/api/MultiServerManAPIProvider.java

@@ -1,17 +1,22 @@
 package cc.maxmc.msm.api;
 
 @SuppressWarnings("unused") // API
-public abstract class MultiServerManAPIProvider {
-    private static MultiServerManAPIProvider instance;
+public class MultiServerManAPIProvider {
+    private static MultiServerManAPI instance = null;
 
     public static MultiServerManAPI getAPI() {
         if (instance == null) {
             throw new NotLoadedException();
         }
-        return instance.provideAPI();
+        return instance;
     }
 
-    abstract MultiServerManAPI provideAPI();
+    public static void register(MultiServerManAPI api) {
+        if (instance != null) {
+            throw new IllegalStateException("The MultiServerMan API has been load twice");
+        }
+        instance = api;
+    }
 
     /**
      * 在加载 API 之前请求 API 时引发异常。