content: /*
   * Copyright 1999-2021 Alibaba Group Holding Ltd.
   *
   * Licensed 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.alibaba.nacos.plugin.trace.spi;
  
  import com.alibaba.nacos.common.trace.event.TraceEvent;
  
  import java.util.List;
  import java.util.concurrent.Executor;
  
  /**
   * Nacos trace event subscriber.
   *
   * @author xiweng.yy
   */
  public interface NacosTraceSubscriber {
      
      /**
       * Get the plugin name, if the same name has loaded by nacos, the older one will be replaced by new one.
       *
       * @return plugin name
       */
      String getName();
      
      /**
       * Event callback.
       *
       * @param event {@link TraceEvent}
       */
      void onEvent(TraceEvent event);
      
      /**
       * Returns which trace events are this subscriber interested in.
       *
       * @return The interested event types.
       */
      List<Class<? extends TraceEvent>> subscribeTypes();
      
      /**
       * It is up to the listener to determine whether the callback is asynchronous or synchronous.
       *
       * @return {@link Executor}
       */
      default Executor executor() {
          return null;
      }
  }
  