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 | |
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27 | package com.mysql.jdbc.jdbc2.optional; |
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28 | |
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29 | |
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30 | import java.lang.reflect.Constructor; |
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31 | import java.sql.SQLException; |
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32 | import java.util.HashMap; |
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33 | import java.util.Map; |
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34 | |
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35 | import javax.sql.XAConnection; |
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36 | import javax.transaction.xa.XAException; |
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37 | import javax.transaction.xa.XAResource; |
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38 | import javax.transaction.xa.Xid; |
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39 | |
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40 | import com.mysql.jdbc.ConnectionImpl; |
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41 | import com.mysql.jdbc.Util; |
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42 | |
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43 | public class SuspendableXAConnection extends MysqlPooledConnection implements |
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44 | XAConnection, XAResource { |
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45 | |
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46 | private static final Constructor<?> JDBC_4_XA_CONNECTION_WRAPPER_CTOR; |
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47 | |
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48 | static { |
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49 | if (Util.isJdbc4()) { |
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50 | try { |
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51 | JDBC_4_XA_CONNECTION_WRAPPER_CTOR = Class.forName( |
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52 | "com.mysql.jdbc.jdbc2.optional.JDBC4SuspendableXAConnection") |
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53 | .getConstructor( |
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54 | new Class[] { ConnectionImpl.class }); |
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55 | } catch (SecurityException e) { |
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56 | throw new RuntimeException(e); |
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57 | } catch (NoSuchMethodException e) { |
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58 | throw new RuntimeException(e); |
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59 | } catch (ClassNotFoundException e) { |
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60 | throw new RuntimeException(e); |
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61 | } |
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62 | } else { |
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63 | JDBC_4_XA_CONNECTION_WRAPPER_CTOR = null; |
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64 | } |
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65 | } |
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66 | |
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67 | protected static SuspendableXAConnection getInstance(ConnectionImpl mysqlConnection) throws SQLException { |
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68 | if (!Util.isJdbc4()) { |
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69 | return new SuspendableXAConnection(mysqlConnection); |
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70 | } |
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71 | |
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72 | return (SuspendableXAConnection) Util.handleNewInstance( |
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73 | JDBC_4_XA_CONNECTION_WRAPPER_CTOR, new Object[] { |
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74 | mysqlConnection}, mysqlConnection.getExceptionInterceptor()); |
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75 | } |
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76 | |
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77 | public SuspendableXAConnection(ConnectionImpl connection) { |
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78 | super(connection); |
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79 | this.underlyingConnection = connection; |
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80 | } |
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81 | |
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82 | private static final Map<Xid, XAConnection> XIDS_TO_PHYSICAL_CONNECTIONS = |
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83 | new HashMap<Xid, XAConnection>(); |
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84 | |
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85 | private Xid currentXid; |
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86 | |
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87 | private XAConnection currentXAConnection; |
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88 | private XAResource currentXAResource; |
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89 | |
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90 | private ConnectionImpl underlyingConnection; |
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91 | |
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92 | private static synchronized XAConnection findConnectionForXid(ConnectionImpl connectionToWrap, Xid xid) |
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93 | throws SQLException { |
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94 | // TODO: check for same GTRID, but different BQUALs...MySQL doesn't allow this yet |
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95 | |
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96 | // Note, we don't need to check for XIDs here, because MySQL itself will complain |
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97 | // with a XAER_NOTA if need be. |
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98 | |
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99 | XAConnection conn = XIDS_TO_PHYSICAL_CONNECTIONS.get(xid); |
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100 | |
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101 | if (conn == null) { |
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102 | conn = new MysqlXAConnection(connectionToWrap, |
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103 | connectionToWrap.getLogXaCommands()); |
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104 | XIDS_TO_PHYSICAL_CONNECTIONS.put(xid, conn); |
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105 | } |
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106 | |
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107 | return conn; |
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108 | } |
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109 | |
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110 | private static synchronized void removeXAConnectionMapping(Xid xid) { |
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111 | XIDS_TO_PHYSICAL_CONNECTIONS.remove(xid); |
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112 | } |
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113 | |
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114 | private synchronized void switchToXid(Xid xid) throws XAException { |
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115 | if (xid == null) { |
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116 | throw new XAException(); |
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117 | } |
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118 | |
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119 | try { |
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120 | if (!xid.equals(this.currentXid)) { |
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121 | XAConnection toSwitchTo = findConnectionForXid(this.underlyingConnection, xid); |
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122 | this.currentXAConnection = toSwitchTo; |
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123 | this.currentXid = xid; |
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124 | this.currentXAResource = toSwitchTo.getXAResource(); |
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125 | } |
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126 | } catch (SQLException sqlEx) { |
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127 | throw new XAException(); |
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128 | } |
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129 | } |
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130 | |
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131 | public XAResource getXAResource() throws SQLException { |
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132 | return this; |
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133 | } |
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134 | |
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135 | public void commit(Xid xid, boolean arg1) throws XAException { |
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136 | switchToXid(xid); |
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137 | this.currentXAResource.commit(xid, arg1); |
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138 | removeXAConnectionMapping(xid); |
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139 | } |
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140 | |
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141 | public void end(Xid xid, int arg1) throws XAException { |
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142 | switchToXid(xid); |
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143 | this.currentXAResource.end(xid, arg1); |
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144 | } |
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145 | |
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146 | public void forget(Xid xid) throws XAException { |
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147 | switchToXid(xid); |
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148 | this.currentXAResource.forget(xid); |
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149 | // remove? |
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150 | removeXAConnectionMapping(xid); |
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151 | } |
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152 | |
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153 | public int getTransactionTimeout() throws XAException { |
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154 | return 0; |
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155 | } |
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156 | |
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157 | public boolean isSameRM(XAResource xaRes) throws XAException { |
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158 | return xaRes == this; |
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159 | } |
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160 | |
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161 | public int prepare(Xid xid) throws XAException { |
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162 | switchToXid(xid); |
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163 | return this.currentXAResource.prepare(xid); |
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164 | } |
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165 | |
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166 | public Xid[] recover(int flag) throws XAException { |
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167 | return MysqlXAConnection.recover(this.underlyingConnection, flag); |
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168 | } |
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169 | |
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170 | public void rollback(Xid xid) throws XAException { |
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171 | switchToXid(xid); |
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172 | this.currentXAResource.rollback(xid); |
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173 | removeXAConnectionMapping(xid); |
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174 | } |
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175 | |
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176 | public boolean setTransactionTimeout(int arg0) throws XAException { |
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177 | return false; |
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178 | } |
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179 | |
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180 | public void start(Xid xid, int arg1) throws XAException { |
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181 | switchToXid(xid); |
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182 | |
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183 | if (arg1 != XAResource.TMJOIN) { |
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184 | this.currentXAResource.start(xid, arg1); |
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185 | |
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186 | return; |
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187 | } |
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188 | |
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189 | // |
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190 | // Emulate join, by using resume on the same physical connection |
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191 | // |
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192 | |
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193 | this.currentXAResource.start(xid, XAResource.TMRESUME); |
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194 | } |
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195 | |
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196 | public synchronized java.sql.Connection getConnection() throws SQLException { |
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197 | if (this.currentXAConnection == null) { |
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198 | return getConnection(false, true); |
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199 | } |
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200 | |
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201 | return this.currentXAConnection.getConnection(); |
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202 | } |
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203 | |
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204 | public void close() throws SQLException { |
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205 | if (this.currentXAConnection == null) { |
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206 | super.close(); |
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207 | } else { |
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208 | removeXAConnectionMapping(this.currentXid); |
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209 | this.currentXAConnection.close(); |
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210 | } |
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211 | } |
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212 | } |
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