001 /* 002 * Sonar, open source software quality management tool. 003 * Copyright (C) 2008-2011 SonarSource 004 * mailto:contact AT sonarsource DOT com 005 * 006 * Sonar is free software; you can redistribute it and/or 007 * modify it under the terms of the GNU Lesser General Public 008 * License as published by the Free Software Foundation; either 009 * version 3 of the License, or (at your option) any later version. 010 * 011 * Sonar is distributed in the hope that it will be useful, 012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 * Lesser General Public License for more details. 015 * 016 * You should have received a copy of the GNU Lesser General Public 017 * License along with Sonar; if not, write to the Free Software 018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02 019 */ 020 package org.sonar.batch.bootstrap; 021 022 import java.sql.Driver; 023 import java.sql.DriverManager; 024 import java.sql.SQLException; 025 import java.util.ArrayList; 026 import java.util.Enumeration; 027 import java.util.HashSet; 028 import java.util.List; 029 030 /** 031 * Companion of {@link JdbcDriverHolder} and allows it to deregister JDBC drivers. 032 * <p> 033 * Some hacks are involved in the loading of the class - see {@link JdbcDriverHolder#stop()}, 034 * so this class can refer to classes only from java.* package and must not be referred from other classes. 035 * Placement and naming of this class and methods are very important, since it loaded and invoked via reflection. 036 * </p> 037 */ 038 public class JdbcLeakPrevention { 039 040 /** 041 * @return list of names of deregistered drivers 042 */ 043 public List<String> clearJdbcDriverRegistrations() throws SQLException { 044 List<String> driverNames = new ArrayList<String>(); 045 HashSet<Driver> originalDrivers = new HashSet<Driver>(); 046 Enumeration<Driver> drivers = DriverManager.getDrivers(); 047 while (drivers.hasMoreElements()) { 048 originalDrivers.add(drivers.nextElement()); 049 } 050 drivers = DriverManager.getDrivers(); 051 while (drivers.hasMoreElements()) { 052 Driver driver = drivers.nextElement(); 053 if (driver.getClass().getClassLoader() != this.getClass().getClassLoader()) { 054 continue; 055 } 056 if (originalDrivers.contains(driver)) { 057 driverNames.add(driver.getClass().getCanonicalName()); 058 } 059 DriverManager.deregisterDriver(driver); 060 } 061 return driverNames; 062 } 063 064 }