source: Ballon/out/artifacts/geisa_artifact/WEB-INF/lib/mysql-connector-java-5.1.21/src/com/mysql/jdbc/StandardLoadBalanceExceptionChecker.java @ 848

/*
  Copyright (c) 2010, 2012 Oracle and/or its affiliates. All rights reserved.

  The MySQL Connector/J is licensed under the terms of the GPLv2
  <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
  There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
  this software, see the FLOSS License Exception
  <http://www.mysql.com/about/legal/licensing/foss-exception.html>.

  This program is free software; you can redistribute it and/or modify it under the terms
  of the GNU General Public License as published by the Free Software Foundation; version 2
  of the License.

  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 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.jdbc;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;

public class StandardLoadBalanceExceptionChecker implements
                LoadBalanceExceptionChecker {
        
        private List<String> sqlStateList;
        private List<Class<?>> sqlExClassList;
        
        public boolean shouldExceptionTriggerFailover(SQLException ex) {
                String sqlState = ex.getSQLState();

                if (sqlState != null) {
                        if (sqlState.startsWith("08")) {
                                // connection error
                                return true;
                        }
                        if(this.sqlStateList != null){
                                // check against SQLState list
                                for(Iterator<String> i = sqlStateList.iterator(); i.hasNext(); ){
                                        if(sqlState.startsWith(i.next().toString())){
                                                return true;
                                        }
                                }
                        }
                }
                
                // always handle CommunicationException
                if(ex instanceof CommunicationsException){
                        return true;
                }
                if(this.sqlExClassList != null){
                        // check against configured class lists
                        for(Iterator<Class<?>> i = sqlExClassList.iterator(); i.hasNext(); ){
                                if(i.next().isInstance(ex)){
                                        return true;
                                }
                        }
                }
                // no matches
                return false;

        }

        public void destroy() {
                // TODO Auto-generated method stub

        }

        public void init(Connection conn, Properties props) throws SQLException {
                configureSQLStateList(props.getProperty("loadBalanceSQLStateFailover", null));
                configureSQLExceptionSubclassList(props.getProperty("loadBalanceSQLExceptionSubclassFailover", null));

        }
        
        private void configureSQLStateList(String sqlStates){
                if(sqlStates == null || "".equals(sqlStates)){
                        return;
                }
                List<String> states = StringUtils.split(sqlStates, ",", true);
                List<String> newStates = new ArrayList<String>();
                
                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<Class<?>>();
                
                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;
                }
                
        }

}