optimize code

 package com.yohoufo.order.service.impl.visitor;
 
 import com.google.common.eventbus.Subscribe;
-import com.yohoufo.common.alarm.Event;
 import com.yohoufo.common.alarm.IEventHandler;
 import com.yohoufo.order.common.CancelType;
 import com.yohoufo.order.common.TabType;
-import com.yohoufo.order.event.ErpCancelSellerOrderEvent;
 import com.yohoufo.order.event.OrderCancelEvent;
 import com.yohoufo.order.service.impl.SellerOrderCancelService;
 import org.slf4j.Logger;
@@ -19,7 +17,7 @@ import java.util.Objects;
  * Created by chenchao on 2018/9/17.
  */
 @Service
-public class SellerOrderCancelHandler implements IEventHandler<Event> {
+public class SellerOrderCancelHandler implements IEventHandler<OrderCancelEvent> {
 
     private final Logger logger = LoggerFactory.getLogger(getClass());
     @Autowired
@@ -28,38 +26,26 @@ public class SellerOrderCancelHandler implements IEventHandler<Event> {
 
     @Override
     @Subscribe
-    public void handle(Event event) {
+    public void handle(OrderCancelEvent event) {
         logger.info("in SellerOrderCancelHandler.handle, event {}", event);
         if (Objects.isNull(event)){
             return;
         }
-        OrderCancelEvent orderCancelEvent;
-        if (event instanceof OrderCancelEvent){
-            orderCancelEvent = (OrderCancelEvent)event;
-            logger.info("in SellerOrderCancelHandler.handle, orderCancelEvent {}", event);
-            TabType actorType = orderCancelEvent.getActorType();
-            CancelType cancelType = orderCancelEvent.getCancelType();
-            if (Objects.isNull(actorType) || Objects.isNull(cancelType)){
-                return;
-            }
-
-            if (actorType.equals(TabType.SELL)){
-                switch (cancelType){
-
-
-                    case TIME_OUT:
-                        AutoCancelCase autoCancelCase = new AutoCancelCase(orderCancelEvent);
-                        autoCancelCase.accept(sellerOrderCancelService);
-                        break;
-                }
-            }
-
+        final OrderCancelEvent orderCancelEvent = event;
+        logger.info("in SellerOrderCancelHandler.handle, orderCancelEvent {}", event);
+        TabType actorType = orderCancelEvent.getActorType();
+        CancelType cancelType = orderCancelEvent.getCancelType();
+        if (Objects.isNull(actorType) || Objects.isNull(cancelType)){
+            return;
         }
 
-        if (event instanceof ErpCancelSellerOrderEvent){
-            ErpCancelSellerOrderEvent erpCancelSellerOrderEvent = (ErpCancelSellerOrderEvent)event;
-            OffShelveCancelCase offShelveCancelCase = new OffShelveCancelCase(erpCancelSellerOrderEvent);
-            offShelveCancelCase.accept(sellerOrderCancelService);
+        if (actorType.equals(TabType.SELL)){
+            switch (cancelType){
+                case TIME_OUT:
+                    AutoCancelCase autoCancelCase = new AutoCancelCase(orderCancelEvent);
+                    autoCancelCase.accept(sellerOrderCancelService);
+                    break;
+            }
         }
 
     }