Update VelocityCore to use Linkage

CommonCore/Linkage/src/de/steamwar/linkage/AbstractLinker.java

@@ -71,6 +71,8 @@ public abstract class AbstractLinker<T> {
                 MinVersion minVersion = clazz.getAnnotation(MinVersion.class);
                 MaxVersion maxVersion = clazz.getAnnotation(MaxVersion.class);
                 if (!versionCheck(clazz, minVersion, maxVersion)) return;
+                EventMode eventMode = clazz.getAnnotation(EventMode.class);
+                if (!eventModeCheck(clazz, eventMode)) return;
                 PluginCheck[] pluginChecks = clazz.getAnnotationsByType(PluginCheck.class);
                 for (PluginCheck pluginCheck : pluginChecks) {
                     if (!pluginCheck(clazz, pluginCheck)) return;
@@ -140,13 +142,22 @@ public abstract class AbstractLinker<T> {
         return true;
     }
 
+    /**
+     * @return {@code true} if the clazz passes the checks {@code false} otherwise
+     */
+    protected boolean eventModeCheck(@NonNull Class<?> clazz, EventMode eventMode) {
+        return true;
+    }
+
     /**
      * There is no need in calling {@link Enable#enable()} by this method.
      */
-    protected abstract void linkObject(Object any);
+    protected void linkObject(Object any) {
+    }
 
     /**
      * There is no need in calling {@link Disable#disable()} ()} by this method.
      */
-    protected abstract void unlinkObject(Object any);
+    protected void unlinkObject(Object any) {
+    }
 }

CommonCore/Linkage/src/de/steamwar/linkage/EventMode.java

@@ -0,0 +1,31 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.linkage;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.TYPE})
+public @interface EventMode {
+    boolean value();
+}