event manager

mirai-core/src/main/java/net/mamoe/mirai/event/MiraiEventManager.java

@@ -4,6 +4,8 @@ import lombok.AllArgsConstructor;
 import lombok.Data;
 
 import java.util.*;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
 import java.util.function.Consumer;
 import java.util.function.Predicate;
 import java.util.stream.Collectors;
@@ -22,6 +24,7 @@ public class MiraiEventManager {
         return MiraiEventManager.instance;
     }
 
+    Lock hooksLock = new ReentrantLock();
     private Map<Class<? extends MiraiEvent>, List<MiraiEventConsumer<? extends MiraiEvent>>> hooks = new HashMap<>();
 
     public <D extends MiraiEvent> void registerUntil(MiraiEventHook<D> hook, Predicate<D> toRemove){
@@ -37,8 +40,8 @@ public class MiraiEventManager {
         this.registerUntil(hook,(a) -> false);
     }
 
-
     public void boardcastEvent(MiraiEvent event){
+        hooksLock.lock();
         if(hooks.containsKey(event.getClass())){
             hooks.put(event.getClass(),
                     hooks.get(event.getClass())
@@ -48,6 +51,7 @@ public class MiraiEventManager {
                     .collect(Collectors.toList())
             );
         }
+        hooksLock.unlock();
     }
 
 }