content: /*
   *
   * 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.alibaba.cloudapp.api.config;
  
  import com.alibaba.cloudapp.api.common.DelegatingClientAware;
  import com.alibaba.cloudapp.exeption.CloudAppException;
  
  import java.util.function.Consumer;
  
  public interface ConfigReadService<Client> extends DelegatingClientAware<Client> {
      String DATA_ID_SEPARATOR_CHAR = "/";
      /**
       * Get the config value as a string
       *
       * @param configName the config name, for Nacos this could be like for format
       *                   /group/dataId.
       * @return the config value as a string
       */
      String  getConfig(String configName) throws CloudAppException;
  
      /**
       * Get the config value as a required object.
       *
       * @param configName the config name, for Nacos this could be like for format
       *                   /group/dataId.
       * @param cls        the class type of the required object.
       * @return the config value as a request object.
       * @throws CloudAppException if the config cannot be found or converted.
       */
      <T> T  getConfig(String configName, Class<T> cls) throws CloudAppException;
  
      /**
       * Get the config value as a required object, and listen for the updates.
       *
       * @param configName the config name, for Nacos this could be like for format
       *                   /group/dataId.
       * @param listener    the listener to the config value when it's updated.
       * @return the config value as a string.
       */
      String getAndListen(String configName, Consumer<String> listener)
              throws CloudAppException;
  }
  