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.druid.pool.ha.selector;
  
  import com.alibaba.druid.pool.ha.HighAvailableDataSource;
  import com.alibaba.druid.support.logging.Log;
  import com.alibaba.druid.support.logging.LogFactory;
  
  /**
   * An enum holding the names and classes of DataSourceSelector.
   *
   * @author DigitalSonic
   */
  public enum DataSourceSelectorEnum {
      BY_NAME("byName", NamedDataSourceSelector.class),
      RANDOM("random", RandomDataSourceSelector.class),
      STICKY_RANDOM("stickyRandom", StickyRandomDataSourceSelector.class);
  
      private static final Log LOG = LogFactory.getLog(DataSourceSelectorEnum.class);
      private String name;
      private Class<? extends DataSourceSelector> clazz;
  
      DataSourceSelectorEnum(String name, Class<? extends DataSourceSelector> clazz) {
          this.name = name;
          this.clazz = clazz;
      }
  
      /**
       * Create a new instance of the DataSourceSelector represented by this enum.
       *
       * @return null if dataSource is not given or exception occurred while creating new instance
       */
      public DataSourceSelector newInstance(HighAvailableDataSource dataSource) {
          if (dataSource == null) {
              LOG.warn("You should provide an instance of HighAvailableDataSource!");
              return null;
          }
  
          DataSourceSelector selector = null;
          try {
              selector = clazz.getDeclaredConstructor(HighAvailableDataSource.class).newInstance(dataSource);
          } catch (Exception e) {
              LOG.error("Can not create new instance of " + clazz.getName(), e);
          }
          return selector;
      }
  
      public String getName() {
          return name;
      }
  
      public Class<? extends DataSourceSelector> getClazz() {
          return clazz;
      }
  }
  