diff --git a/mirai-core/src/main/java/net/mamoe/mirai/MiraiMain.java b/mirai-core/src/main/java/net/mamoe/mirai/MiraiMain.java
index 942fffb2a..7b3531266 100644
--- a/mirai-core/src/main/java/net/mamoe/mirai/MiraiMain.java
+++ b/mirai-core/src/main/java/net/mamoe/mirai/MiraiMain.java
@@ -14,31 +14,9 @@ public final class MiraiMain {
         Runtime.getRuntime().addShutdownHook(new Thread(() -> {
             server.shutdown();
         }));
-        server.getEventManager()
-                .onEvent(ServerDisableEvent.class)
-                .setHandler(a -> {
-                    System.out.println("?");
-                });
-
-        server.getEventManager()
-                .onEventOnce(ServerDisableEvent.class)
-                .setHandler(a -> {
-                    System.out.println("?");
-                });
-
-        server.getEventManager()
-                .onEvent(ServerDisableEvent.class)
-                .setHandler(a -> {
-                    System.out.println("?");
-                })
-                .setValidWhile((a) -> true);
-
-        server.getEventManager()
-                .onEvent(ServerDisableEvent.class)
-                .setHandler(a -> {
-                    System.out.println("?");
-                })
-                .setValidUntil((a) -> true);
+        server.getTaskManager().repeatingTask(() -> {
+            System.out.println(3);
+        },1000,5);
 
     }
 }
diff --git a/mirai-core/src/main/java/net/mamoe/mirai/MiraiServer.java b/mirai-core/src/main/java/net/mamoe/mirai/MiraiServer.java
index 56f272518..d22e93eb8 100644
--- a/mirai-core/src/main/java/net/mamoe/mirai/MiraiServer.java
+++ b/mirai-core/src/main/java/net/mamoe/mirai/MiraiServer.java
@@ -43,6 +43,7 @@ public class MiraiServer {
         this.eventManager = MiraiEventManager.getInstance();
         this.taskManager = MiraiTaskManager.getInstance();
 
+        /*
         try {
             Network.start(Network.getAvailablePort());
         } catch (InterruptedException | IOException e) {
@@ -50,6 +51,7 @@ public class MiraiServer {
            this.shutdown();
         }
 
+           */
 
     }
 
diff --git a/mirai-core/src/main/java/net/mamoe/mirai/event/MiraiEventHook.java b/mirai-core/src/main/java/net/mamoe/mirai/event/MiraiEventHook.java
index 8382c5a23..f94a48db3 100644
--- a/mirai-core/src/main/java/net/mamoe/mirai/event/MiraiEventHook.java
+++ b/mirai-core/src/main/java/net/mamoe/mirai/event/MiraiEventHook.java
@@ -13,13 +13,13 @@ public class MiraiEventHook<T extends MiraiEvent> {
     Class<T> eventClass;
 
     @Getter
-    private Consumer<T> handler;
+    private volatile Consumer<T> handler;
 
     @Getter
-    private int priority = 0;
+    private volatile int priority = 0;
 
     @Getter
-    private boolean ignoreCancelled = true;
+    private volatile boolean ignoreCancelled = true;
 
     /**
      * return true -> this hook need to be removed
diff --git a/mirai-core/src/main/java/net/mamoe/mirai/event/MiraiEventManager.java b/mirai-core/src/main/java/net/mamoe/mirai/event/MiraiEventManager.java
index b19afa53d..d015cce7e 100644
--- a/mirai-core/src/main/java/net/mamoe/mirai/event/MiraiEventManager.java
+++ b/mirai-core/src/main/java/net/mamoe/mirai/event/MiraiEventManager.java
@@ -29,13 +29,17 @@ public class MiraiEventManager {
     private Map<Class<? extends MiraiEvent>, List<MiraiEventHook<? extends MiraiEvent>>> hooks = new HashMap<>();
 
     public <D extends MiraiEvent> void registerUntil(MiraiEventHook<D> hook, Predicate<D> toRemove){
+        hooksLock.lock();
         hooks.putIfAbsent(hook.getEventClass(),new ArrayList<>());
         hooks.get(hook.getEventClass()).add(hook.setValidUntil(toRemove));
+        hooksLock.unlock();
     }
 
     public <D extends MiraiEvent> void registerWhile(MiraiEventHook<D> hook, Predicate<D> toKeep){
+        hooksLock.lock();
         hooks.putIfAbsent(hook.getEventClass(),new ArrayList<>());
         hooks.get(hook.getEventClass()).add(hook.setValidWhile(toKeep));
+        hooksLock.unlock();
     }
 
     public <D extends MiraiEvent> void registerOnce(MiraiEventHook<D> hook){
@@ -74,12 +78,14 @@ public class MiraiEventManager {
 
     public void boardcastEvent(MiraiEvent event){
         hooksLock.lock();
+        System.out.println(hooks);
         if(hooks.containsKey(event.getClass())){
+            System.out.println(hooks.get(event.getClass()).size());
             hooks.put(event.getClass(),
                     hooks.get(event.getClass())
                     .stream()
                     .sorted(Comparator.comparingInt(MiraiEventHook::getPriority))
-                    .dropWhile(a -> a.accept(event))
+                    .filter(a -> !a.accept(event))
                     .collect(Collectors.toList())
             );
         }
diff --git a/mirai-core/src/main/java/net/mamoe/mirai/task/MiraiTaskManager.java b/mirai-core/src/main/java/net/mamoe/mirai/task/MiraiTaskManager.java
index 39d59663f..bdcce07e1 100644
--- a/mirai-core/src/main/java/net/mamoe/mirai/task/MiraiTaskManager.java
+++ b/mirai-core/src/main/java/net/mamoe/mirai/task/MiraiTaskManager.java
@@ -25,9 +25,11 @@ public class MiraiTaskManager {
 
     private MiraiTaskManager() {
         this.pool = new MiraiThreadPool();
+
         MiraiServer.getInstance().getEventManager()
                 .onEvent(ServerDisableEvent.class)
                 .setHandler(a -> this.pool.close());
+
     }
 
     /**
@@ -99,7 +101,7 @@ public class MiraiTaskManager {
     }
 
     public void repeatingTask(Runnable runnable, long interval, int times,  MiraiTaskExceptionHandler handler){
-        AtomicInteger integer = new AtomicInteger(times);
+        AtomicInteger integer = new AtomicInteger(times-1);
         this.repeatingTask(
                 runnable,interval, a ->  integer.getAndDecrement() > 0, handler
         );
diff --git a/mirai-core/src/main/java/net/mamoe/mirai/util/_TEAEncryption.java b/mirai-core/src/main/java/net/mamoe/mirai/util/_TEAEncryption.java
index 003ff1b7c..63a9cc0da 100644
--- a/mirai-core/src/main/java/net/mamoe/mirai/util/_TEAEncryption.java
+++ b/mirai-core/src/main/java/net/mamoe/mirai/util/_TEAEncryption.java
@@ -27,7 +27,7 @@ import java.util.Random;
  * </code>
  * </pre>
  *
- * @author https://juejin.im/post/5c5bdf8cf265da2dc706d532
+ * @author b
  * @author luma
  * @author notXX
  */