Performance: fixed memory leaks on each card viewer or draft open (10 Mb per call, related to #11285, fixes #9548)

Mage/src/main/java/mage/cards/repository/ExpansionRepository.java

@@ -62,10 +62,19 @@ public enum ExpansionRepository {
 
     }
 
+    /**
+     * Warning, don't forget to unsubscribe due memory leak problems
+     *
+     * @param listener
+     */
     public void subscribe(Listener<RepositoryEvent> listener) {
         eventSource.addListener(listener);
     }
 
+    public void unsubscribe(Listener<RepositoryEvent> listener) {
+        eventSource.removeListener(listener);
+    }
+
     public void saveSets(final List<ExpansionInfo> newSets, final List<ExpansionInfo> updatedSets, long newContentVersion) {
         try {
             expansionDao.callBatchTasks(() -> {

Mage/src/main/java/mage/cards/repository/RepositoryEventSource.java

@@ -20,7 +20,12 @@ public class RepositoryEventSource implements EventSource<RepositoryEvent>, Seri
     }
 
     @Override
-    public void removeAllListener() {
+    public void removeListener(Listener<RepositoryEvent> listener) {
+        dispatcher.removeListener(listener);
+    }
+
+    @Override
+    public void removeAllListeners() {
         dispatcher.removeAllListener();
     }
 

Mage/src/main/java/mage/game/events/EventSource.java

@@ -1,17 +1,17 @@
-
-
 package mage.game.events;
 
 import java.io.Serializable;
 
 /**
- *
+ * TODO: there are duplicated interfaces of EventSource, must combine in single
  * @author BetaSteward_at_googlemail.com
  * @param <E>
  */
 public interface EventSource<E extends ExternalEvent> extends Serializable {
 
     void addListener(Listener<E> listener);
+
+    void removeListener(Listener<E> listener);
     
-    void removeAllListener();
+    void removeAllListeners();
 }

Mage/src/main/java/mage/game/events/PlayerQueryEventSource.java

@@ -29,7 +29,12 @@ public class PlayerQueryEventSource implements EventSource<PlayerQueryEvent>, Se
     }
 
     @Override
-    public void removeAllListener() {
+    public void removeListener(Listener<PlayerQueryEvent> listener) {
+        dispatcher.removeListener(listener);
+    }
+
+    @Override
+    public void removeAllListeners() {
         dispatcher.removeAllListener();
     }
 

Mage/src/main/java/mage/game/events/TableEventSource.java

@@ -26,7 +26,12 @@ public class TableEventSource implements EventSource<TableEvent>, Serializable {
     }
 
     @Override
-    public void removeAllListener() {
+    public void removeListener(Listener<TableEvent> listener) {
+        dispatcher.removeListener(listener);
+    }
+
+    @Override
+    public void removeAllListeners() {
         dispatcher.removeAllListener();
     }