StandardLoadBalanceExceptionChecker.java
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/*
Copyright (c) 2010, 2015, 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 FOSS 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 = this.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 = this.sqlExClassList.iterator(); i.hasNext();) {
if (i.next().isInstance(ex)) {
return true;
}
}
}
// no matches
return false;
}
public void destroy() {
}
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;
}
}
}