Remove useless DispatchEvent (apache#34220)

* Remove useless DispatchEvent

* Remove useless DispatchEvent

* Remove useless DispatchEvent

mode/type/cluster/core/src/main/java/org/apache/shardingsphere/mode/manager/cluster/event/dispatch/handler/database/TableChangedHandler.java

@@ -56,7 +56,7 @@ public void handleCreatedOrAltered(final String databaseName, final String schem
     }
 
     /**
-     * Handle table altered.
+     * Handle table dropped.
      *
      * @param databaseName database name
      * @param schemaName schema name

mode/type/cluster/core/src/main/java/org/apache/shardingsphere/mode/manager/cluster/event/dispatch/handler/database/ViewChangedHandler.java

@@ -52,7 +52,7 @@ public void handleCreatedOrAltered(final String databaseName, final String schem
                 "Invalid active version: %s of key: %s", event.getValue(), event.getKey());
         ShardingSphereView view = contextManager.getPersistServiceFacade().getMetaDataPersistService().getDatabaseMetaDataFacade().getView().load(databaseName, schemaName, viewName);
         contextManager.getMetaDataContextManager().getSchemaMetaDataManager().alterSchema(databaseName, schemaName, null, view);
-        new ShardingSphereStatisticsRefreshEngine(contextManager).asyncRefresh();
+        statisticsRefreshEngine.asyncRefresh();
     }
 
     /**
@@ -65,6 +65,6 @@ public void handleCreatedOrAltered(final String databaseName, final String schem
     public void handleDropped(final String databaseName, final String schemaName, final DataChangedEvent event) {
         String viewName = ViewMetaDataNode.getViewName(event.getKey()).orElseThrow(() -> new IllegalStateException("View name not found."));
         contextManager.getMetaDataContextManager().getSchemaMetaDataManager().alterSchema(databaseName, schemaName, null, viewName);
-        new ShardingSphereStatisticsRefreshEngine(contextManager).asyncRefresh();
+        statisticsRefreshEngine.asyncRefresh();
     }
 }

mode/type/cluster/core/src/main/java/org/apache/shardingsphere/mode/manager/cluster/event/dispatch/listener/DataChangedEventListenerRegistry.java

@@ -18,7 +18,6 @@
 package org.apache.shardingsphere.mode.manager.cluster.event.dispatch.listener;
 
 import org.apache.shardingsphere.infra.spi.ShardingSphereServiceLoader;
-import org.apache.shardingsphere.infra.util.eventbus.EventBusContext;
 import org.apache.shardingsphere.metadata.persist.node.DatabaseMetaDataNode;
 import org.apache.shardingsphere.mode.manager.ContextManager;
 import org.apache.shardingsphere.mode.manager.cluster.event.dispatch.handler.DataChangedEventHandler;
@@ -37,14 +36,11 @@ public final class DataChangedEventListenerRegistry {
 
     private final ClusterPersistRepository repository;
 
-    private final EventBusContext eventBusContext;
-
     private final Collection<String> databaseNames;
 
     public DataChangedEventListenerRegistry(final ContextManager contextManager, final Collection<String> databaseNames) {
         this.contextManager = contextManager;
         repository = (ClusterPersistRepository) contextManager.getPersistServiceFacade().getRepository();
-        eventBusContext = contextManager.getComputeNodeInstanceContext().getEventBusContext();
         this.databaseNames = databaseNames;
     }