/* * Copyright (c) 2010, 2018, Oracle and/or its affiliates. All rights reserved. * * 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; } } }