wujimin commented on a change in pull request #570: SCB-360 write simpler 
eventBus to optimize performance

 File path: 
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+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.common.eventbus;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Set;
+import java.util.concurrent.CopyOnWriteArrayList;
+import org.apache.servicecomb.foundation.common.concurrent.ConcurrentHashMapEx;
+import com.google.common.collect.Multimap;
+// EventBus has performance problem, we create a new simpler eventBus
+// extend from EventBus is not necessary
+// but EventManager has a public EventBus field, we need to make compatible
+// different between this class and EventBus:
+// 1. not support cycle trigger:
+//   subscribe a, when handle a, trigger event b
+//   subscribe b, when handle b, trigger event a
 Review comment:
   changed to javadoc in SimpleEventBus
   but not in EventManager

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