Switched API to singleton

Author: hidden1nin

src/main/java/com/hiddentech/playerstorage/PlayerStorageAPI.java

@@ -55,8 +55,9 @@ public PlayerRegistry getRegistry() {
     }
 
     private final PlayerRegistry registry;
+    private static PlayerStorageAPI instance;
 
-    public PlayerStorageAPI(JavaPlugin plugin) {
+    private PlayerStorageAPI(JavaPlugin plugin) {
         this.plugin = plugin;
         this.registry = new PlayerRegistry(this);
         new PlayerJoinListener(this);
@@ -79,6 +80,12 @@ public PlayerStorageAPI(JavaPlugin plugin) {
         });
 
     }
+    public PlayerStorageAPI getInstance(JavaPlugin plugin){
+        if(instance==null){
+            instance = new PlayerStorageAPI(plugin);
+        }
+        return instance;
+    }
 
     private void enableMongo(boolean mongoEnabled) {
         File file = new File(getPlugin().getDataFolder() + "/Database.yml");