content: /*
   * Copyright (c) 2010, 2020, Oracle and/or its affiliates.
   *
   * This program is free software; you can redistribute it and/or modify it under
   * the terms of the GNU General Public License, version 2.0, as published by the
   * Free Software Foundation.
   *
   * This program is also distributed with certain software (including but not
   * limited to OpenSSL) that is licensed under separate terms, as designated in a
   * particular file or component or in included license documentation. The
   * authors of MySQL hereby grant you an additional permission to link the
   * program and your derivative works with the separately licensed software that
   * they have included with MySQL.
   *
   * Without limiting anything contained in the foregoing, this file, which is
   * part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
   * version 1.0, a copy of which can be found at
   * http://oss.oracle.com/licenses/universal-foss-exception.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
   * FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
   * for more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program; if not, write to the Free Software Foundation, Inc.,
   * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
   */
  
  package com.mysql.cj.jdbc.ha;
  
  import java.sql.SQLException;
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Properties;
  
  import com.mysql.cj.conf.PropertyKey;
  import com.mysql.cj.exceptions.CJCommunicationsException;
  import com.mysql.cj.jdbc.exceptions.CommunicationsException;
  import com.mysql.cj.util.StringUtils;
  
  public class StandardLoadBalanceExceptionChecker implements LoadBalanceExceptionChecker {
  
      private List<String> sqlStateList;
      private List<Class<?>> sqlExClassList;
  
      @Override
      public boolean shouldExceptionTriggerFailover(Throwable ex) {
          String sqlState = ex instanceof SQLException ? ((SQLException) ex).getSQLState() : null;
  
          if (sqlState != null) {
              if (sqlState.startsWith("08")) {
                  // connection error
                  return true;
              }
              if (this.sqlStateList != null) {
                  // check against SQLState list
                  for (Iterator<String> i = this.sqlStateList.iterator(); i.hasNext();) {
                      if (sqlState.startsWith(i.next().toString())) {
                          return true;
                      }
                  }
              }
          }
  
          // always handle CommunicationException
          if (ex instanceof CommunicationsException || ex instanceof CJCommunicationsException) {
              return true;
          }
  
          if (this.sqlExClassList != null) {
              // check against configured class lists
              for (Iterator<Class<?>> i = this.sqlExClassList.iterator(); i.hasNext();) {
                  if (i.next().isInstance(ex)) {
                      return true;
                  }
              }
          }
          // no matches
          return false;
      }
  
      @Override
      public void destroy() {
      }
  
      @Override
      public void init(Properties props) {
          configureSQLStateList(props.getProperty(PropertyKey.loadBalanceSQLStateFailover.getKeyName(), null));
          configureSQLExceptionSubclassList(props.getProperty(PropertyKey.loadBalanceSQLExceptionSubclassFailover.getKeyName(), null));
      }
  
      private void configureSQLStateList(String sqlStates) {
          if (sqlStates == null || "".equals(sqlStates)) {
              return;
          }
          List<String> states = StringUtils.split(sqlStates, ",", true);
          List<String> newStates = new ArrayList<>();
  
          for (String state : states) {
              if (state.length() > 0) {
                  newStates.add(state);
              }
          }
          if (newStates.size() > 0) {
              this.sqlStateList = newStates;
          }
      }
  
      private void configureSQLExceptionSubclassList(String sqlExClasses) {
          if (sqlExClasses == null || "".equals(sqlExClasses)) {
              return;
          }
          List<String> classes = StringUtils.split(sqlExClasses, ",", true);
          List<Class<?>> newClasses = new ArrayList<>();
  
          for (String exClass : classes) {
              try {
                  Class<?> c = Class.forName(exClass);
                  newClasses.add(c);
              } catch (Exception e) {
                  // ignore and don't check, class doesn't exist
              }
          }
          if (newClasses.size() > 0) {
              this.sqlExClassList = newClasses;
          }
      }
  }
  