content: /*
   * Copyright 1999-2023 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.persistence.datasource;
  
  import com.alibaba.nacos.common.utils.CollectionUtils;
  import com.alibaba.nacos.common.utils.Preconditions;
  import com.alibaba.nacos.common.utils.StringUtils;
  import com.zaxxer.hikari.HikariDataSource;
  import org.springframework.boot.context.properties.bind.Bindable;
  import org.springframework.boot.context.properties.bind.Binder;
  import org.springframework.core.env.Environment;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Objects;
  
  import static com.alibaba.nacos.common.utils.CollectionUtils.getOrDefault;
  
  /**
   * Properties of external DataSource.
   *
   * @author Nacos
   */
  public class ExternalDataSourceProperties {
      
      private static final String JDBC_DRIVER_NAME = "com.mysql.cj.jdbc.Driver";
      
      private static final String TEST_QUERY = "SELECT 1";
      
      private Integer num;
      
      private List<String> url = new ArrayList<>();
      
      private List<String> user = new ArrayList<>();
      
      private List<String> password = new ArrayList<>();
      
      public void setNum(Integer num) {
          this.num = num;
      }
      
      public void setUrl(List<String> url) {
          this.url = url;
      }
      
      public void setUser(List<String> user) {
          this.user = user;
      }
      
      public void setPassword(List<String> password) {
          this.password = password;
      }
      
      /**
       * Build serveral HikariDataSource.
       *
       * @param environment {@link Environment}
       * @param callback    Callback function when constructing data source
       * @return List of {@link HikariDataSource}
       */
      List<HikariDataSource> build(Environment environment, Callback<HikariDataSource> callback) {
          List<HikariDataSource> dataSources = new ArrayList<>();
          Binder.get(environment).bind("db", Bindable.ofInstance(this));
          Preconditions.checkArgument(Objects.nonNull(num), "db.num is null");
          Preconditions.checkArgument(CollectionUtils.isNotEmpty(user), "db.user or db.user.[index] is null");
          Preconditions.checkArgument(CollectionUtils.isNotEmpty(password), "db.password or db.password.[index] is null");
          for (int index = 0; index < num; index++) {
              int currentSize = index + 1;
              Preconditions.checkArgument(url.size() >= currentSize, "db.url.%s is null", index);
              DataSourcePoolProperties poolProperties = DataSourcePoolProperties.build(environment);
              if (StringUtils.isEmpty(poolProperties.getDataSource().getDriverClassName())) {
                  poolProperties.setDriverClassName(JDBC_DRIVER_NAME);
              }
              poolProperties.setJdbcUrl(url.get(index).trim());
              poolProperties.setUsername(getOrDefault(user, index, user.get(0)).trim());
              poolProperties.setPassword(getOrDefault(password, index, password.get(0)).trim());
              HikariDataSource ds = poolProperties.getDataSource();
              if (StringUtils.isEmpty(ds.getConnectionTestQuery())) {
                  ds.setConnectionTestQuery(TEST_QUERY);
              }
              
              dataSources.add(ds);
              callback.accept(ds);
          }
          Preconditions.checkArgument(CollectionUtils.isNotEmpty(dataSources), "no datasource available");
          return dataSources;
      }
      
      interface Callback<D> {
          
          /**
           * Perform custom logic.
           *
           * @param datasource dataSource.
           */
          void accept(D datasource);
      }
  }
  