001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *      http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.apache.oozie.util.db;
020
021import com.mysql.jdbc.Driver;
022
023import java.sql.Connection;
024import java.sql.SQLException;
025import java.util.Properties;
026
027/**
028 * Used for runtime database error injection on MySQL.
029 * <p>
030 * Necessary steps:
031 * <ul>
032 *     <li>set {@code oozie.service.JPAService.connection.data.source} to
033 *     {@code org.apache.oozie.util.db.BasicDataSourceWrapper} within {@code oozie-site.xml}</li>
034 *     <li>set {@code oozie.service.JPAService.jdbc.driver} to {@code org.apache.oozie.util.db.FailingMySQLDriverWrapper}
035 *      within {@code oozie-site.xml}</li>
036 *     <li>restart Oozie server</li>
037 *     <li>submit / start some workflows, coordinators etc.</li>
038 *     <li>see any of those {@code JPAException} instances with following message prefix:
039 *     {@code Deliberately failing to prepare statement.}</li>
040 * </ul>
041 */
042public class FailingMySQLDriverWrapper extends Driver {
043    public FailingMySQLDriverWrapper() throws SQLException {
044        super();
045    }
046
047    public Connection connect(final String url,
048                              final Properties info) throws SQLException {
049        return new FailingConnectionWrapper(super.connect(url, info));
050    }
051}