content: /*
   * Copyright 1999-2018 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.consistency;
  
  import java.io.Serializable;
  import java.util.Set;
  
  /**
   * Consistent protocol related configuration objects.
   *
   * <p>{@link RequestProcessor} : The consistency protocol provides services for all businesses, but each business only cares
   * about the transaction information belonging to that business, and the transaction processing between the various
   * services should not block each other. Therefore, the LogProcessor is abstracted to implement the parallel processing
   * of transactions of different services. Corresponding LogProcessor sub-interface: LogProcessor4AP or LogProcessor4CP,
   * different consistency protocols will actively discover the corresponding LogProcessor
   *
   * @author <a href="mailto:liaochuntao@live.com">liaochuntao</a>
   */
  public interface Config<L extends RequestProcessor> extends Serializable {
      
      /**
       * Set the cluster node information to initialize，like [ip:port, ip:port, ip:port].
       *
       * @param self    local node address information, ip:port
       * @param members {@link Set}
       */
      void setMembers(String self, Set<String> members);
      
      /**
       * members join.
       *
       * @param members {@link Set}
       */
      void addMembers(Set<String> members);
      
      /**
       * members leave.
       *
       * @param members {@link Set}
       */
      void removeMembers(Set<String> members);
      
      /**
       * get local node address info.
       *
       * @return address
       */
      String getSelfMember();
      
      /**
       * get the cluster node information.
       *
       * @return members info, like [ip:port, ip:port, ip:port]
       */
      Set<String> getMembers();
      
      /**
       * Add configuration content.
       *
       * @param key   config key
       * @param value config value
       */
      void setVal(String key, String value);
      
      /**
       * get configuration content by key.
       *
       * @param key config key
       * @return config value
       */
      String getVal(String key);
      
      /**
       * get configuration content by key, if not found, use default-val.
       *
       * @param key        config key
       * @param defaultVal default value
       * @return config value
       */
      String getValOfDefault(String key, String defaultVal);
      
  }
  