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.auth.spi.server;
  
  import com.alibaba.nacos.common.spi.NacosServiceLoader;
  import com.alibaba.nacos.common.utils.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Optional;
  
  /**
   * Load Plugins.
   *
   * @author Wuyfee
   * @author xiweng.yy
   */
  public class AuthPluginManager {
      
      private static final Logger LOGGER = LoggerFactory.getLogger(AuthPluginManager.class);
      
      private static final AuthPluginManager INSTANCE = new AuthPluginManager();
      
      /**
       * The relationship of context type and {@link AuthPluginService}.
       */
      private final Map<String, AuthPluginService> authServiceMap = new HashMap<>();
      
      private AuthPluginManager() {
          initAuthServices();
      }
      
      private void initAuthServices() {
          Collection<AuthPluginService> authPluginServices = NacosServiceLoader.load(AuthPluginService.class);
          for (AuthPluginService each : authPluginServices) {
              if (StringUtils.isEmpty(each.getAuthServiceName())) {
                  LOGGER.warn(
                          "[AuthPluginManager] Load AuthPluginService({}) AuthServiceName(null/empty) fail. Please Add AuthServiceName to resolve.",
                          each.getClass());
                  continue;
              }
              authServiceMap.put(each.getAuthServiceName(), each);
              LOGGER.info("[AuthPluginManager] Load AuthPluginService({}) AuthServiceName({}) successfully.",
                      each.getClass(), each.getAuthServiceName());
          }
      }
      
      public static AuthPluginManager getInstance() {
          return INSTANCE;
      }
      
      /**
       * get AuthPluginService instance which AuthPluginService.getType() is type.
       *
       * @param authServiceName AuthServiceName, mark a AuthPluginService instance.
       * @return AuthPluginService instance.
       */
      public Optional<AuthPluginService> findAuthServiceSpiImpl(String authServiceName) {
          return Optional.ofNullable(authServiceMap.get(authServiceName));
      }
      
  }
  