content: /*
   *
   * Copyright 1999-2025 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.core.remote.grpc;
  
  import com.alibaba.nacos.common.spi.NacosServiceLoader;
  import com.alibaba.nacos.common.utils.LoggerUtils;
  import com.alibaba.nacos.core.remote.Connection;
  import com.alibaba.nacos.core.remote.ConnectionMeta;
  import io.grpc.netty.shaded.io.netty.channel.Channel;
  import io.grpc.stub.StreamObserver;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import java.util.Objects;
  
  /**
   * ConnectionGeneratorServiceDelegate.
   *
   * @author jianwei.wjw
   */
  
  public class ConnectionGeneratorServiceDelegate {
      private String connectionGeneratorType = System.getProperty("nacos.core.remote.connection.generator", "nacos");
      
      private ConnectionGeneratorService connectionGeneratorService = null;
      
      private static final Logger LOGGER = LoggerFactory.getLogger(ConnectionGeneratorServiceDelegate.class);
      
      private ConnectionGeneratorServiceDelegate() {
          for (ConnectionGeneratorService connectionGeneratorService : NacosServiceLoader.load(ConnectionGeneratorService.class)) {
              if (connectionGeneratorService.getType().equals(connectionGeneratorType)) {
                  this.connectionGeneratorService = connectionGeneratorService;
                  LoggerUtils.printIfInfoEnabled(LOGGER, "{} has been loaded, class: {}",
                          connectionGeneratorType, connectionGeneratorService.getClass().getName());
              }
          }
          
          if (Objects.isNull(connectionGeneratorService)) {
              throw new RuntimeException("can not find implementation of "
                      + ConnectionGeneratorService.class.getName() + " for type " + connectionGeneratorType);
          }
      }
      
      private static final ConnectionGeneratorServiceDelegate INSTANCE = new ConnectionGeneratorServiceDelegate();
      
      public static ConnectionGeneratorServiceDelegate getInstance() {
          return INSTANCE;
      }
      
      public Connection getConnection(ConnectionMeta metaInfo, StreamObserver streamObserver, Channel channel) {
          return connectionGeneratorService.getConnection(metaInfo, streamObserver, channel);
      }
  }
  