1 | /* |
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2 | Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved. |
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3 | |
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4 | |
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5 | The MySQL Connector/J is licensed under the terms of the GPLv2 |
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6 | <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors. |
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7 | There are special exceptions to the terms and conditions of the GPLv2 as it is applied to |
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8 | this software, see the FLOSS License Exception |
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9 | <http://www.mysql.com/about/legal/licensing/foss-exception.html>. |
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10 | |
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11 | This program is free software; you can redistribute it and/or modify it under the terms |
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12 | of the GNU General Public License as published by the Free Software Foundation; version 2 |
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13 | of the License. |
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14 | |
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15 | This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; |
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16 | without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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17 | See the GNU General Public License for more details. |
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18 | |
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19 | You should have received a copy of the GNU General Public License along with this |
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20 | program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth |
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21 | Floor, Boston, MA 02110-1301 USA |
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22 | |
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23 | |
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24 | |
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25 | */ |
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26 | package com.mysql.jdbc.jdbc2.optional; |
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27 | |
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28 | import java.lang.reflect.InvocationHandler; |
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29 | import java.lang.reflect.InvocationTargetException; |
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30 | import java.lang.reflect.Method; |
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31 | import java.lang.reflect.Proxy; |
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32 | import java.sql.SQLException; |
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33 | import java.util.Map; |
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34 | |
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35 | import com.mysql.jdbc.ExceptionInterceptor; |
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36 | import com.mysql.jdbc.SQLError; |
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37 | |
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38 | /** |
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39 | * Base class for all wrapped instances created by LogicalHandle |
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40 | * |
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41 | * @author Mark matthews |
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42 | * |
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43 | * @version $Id$ |
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44 | */ |
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45 | abstract class WrapperBase { |
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46 | protected MysqlPooledConnection pooledConnection; |
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47 | |
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48 | /** |
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49 | * Fires connection error event if required, before re-throwing exception |
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50 | * |
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51 | * @param sqlEx |
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52 | * the SQLException that has ocurred |
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53 | * @throws SQLException |
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54 | * (rethrown) |
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55 | */ |
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56 | protected void checkAndFireConnectionError(SQLException sqlEx) |
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57 | throws SQLException { |
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58 | if (this.pooledConnection != null) { |
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59 | if (SQLError.SQL_STATE_COMMUNICATION_LINK_FAILURE.equals(sqlEx |
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60 | .getSQLState())) { |
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61 | this.pooledConnection.callConnectionEventListeners( |
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62 | MysqlPooledConnection.CONNECTION_ERROR_EVENT, sqlEx); |
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63 | } |
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64 | } |
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65 | |
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66 | throw sqlEx; |
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67 | } |
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68 | |
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69 | protected Map unwrappedInterfaces = null; |
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70 | protected ExceptionInterceptor exceptionInterceptor; |
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71 | |
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72 | protected WrapperBase(MysqlPooledConnection pooledConnection) { |
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73 | this.pooledConnection = pooledConnection; |
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74 | this.exceptionInterceptor = this.pooledConnection.getExceptionInterceptor(); |
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75 | } |
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76 | |
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77 | protected class ConnectionErrorFiringInvocationHandler implements InvocationHandler { |
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78 | Object invokeOn = null; |
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79 | |
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80 | public ConnectionErrorFiringInvocationHandler(Object toInvokeOn) { |
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81 | invokeOn = toInvokeOn; |
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82 | } |
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83 | |
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84 | public Object invoke(Object proxy, Method method, |
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85 | Object[] args) throws Throwable { |
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86 | Object result = null; |
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87 | |
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88 | try { |
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89 | result = method.invoke(invokeOn, args); |
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90 | |
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91 | if (result != null) { |
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92 | result = proxyIfInterfaceIsJdbc(result, |
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93 | result.getClass()); |
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94 | } |
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95 | } catch (InvocationTargetException e) { |
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96 | if (e.getTargetException() instanceof SQLException) { |
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97 | checkAndFireConnectionError((SQLException) e |
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98 | .getTargetException()); |
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99 | } else { |
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100 | throw e; |
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101 | } |
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102 | } |
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103 | |
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104 | return result; |
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105 | } |
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106 | |
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107 | /** |
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108 | * Recursively checks for interfaces on the given object to determine |
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109 | * if it implements a java.sql interface, and if so, proxies the |
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110 | * instance so that we can catch and fire SQL errors. |
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111 | * @param toProxy |
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112 | * @param clazz |
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113 | * @return |
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114 | */ |
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115 | private Object proxyIfInterfaceIsJdbc(Object toProxy, Class<?> clazz) { |
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116 | Class<?>[] interfaces = clazz.getInterfaces(); |
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117 | |
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118 | for (Class<?> iclass : interfaces) { |
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119 | String packageName = iclass.getPackage().getName(); |
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120 | |
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121 | if ("java.sql".equals(packageName) || |
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122 | "javax.sql".equals(packageName)) { |
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123 | return Proxy.newProxyInstance(toProxy.getClass() |
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124 | .getClassLoader(), interfaces, |
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125 | new ConnectionErrorFiringInvocationHandler(toProxy)); |
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126 | } |
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127 | |
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128 | return proxyIfInterfaceIsJdbc(toProxy, iclass); |
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129 | } |
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130 | |
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131 | return toProxy; |
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132 | } |
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133 | } |
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134 | } |
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