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;
  
  import com.alibaba.nacos.common.spi.NacosServiceLoader;
  import com.alibaba.nacos.plugin.trace.spi.NacosTraceSubscriber;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  /**
   * Nacos trace event subscriber manager.
   *
   * @author xiweng.yy
   */
  public class NacosTracePluginManager {
      
      private static final Logger LOGGER = LoggerFactory.getLogger(NacosTracePluginManager.class);
      
      private static final NacosTracePluginManager INSTANCE = new NacosTracePluginManager();
      
      private final Map<String, NacosTraceSubscriber> traceSubscribers;
      
      private NacosTracePluginManager() {
          this.traceSubscribers = new ConcurrentHashMap<>();
          Collection<NacosTraceSubscriber> plugins = NacosServiceLoader.load(NacosTraceSubscriber.class);
          for (NacosTraceSubscriber each : plugins) {
              this.traceSubscribers.put(each.getName(), each);
              LOGGER.info("[TracePluginManager] Load NacosTraceSubscriber({}) name({}) successfully.", each.getClass(),
                      each.getName());
          }
      }
      
      public static NacosTracePluginManager getInstance() {
          return INSTANCE;
      }
      
      public Collection<NacosTraceSubscriber> getAllTraceSubscribers() {
          return new HashSet<>(traceSubscribers.values());
      }
  }
  