| 1 | package com.mysql.jdbc.jdbc2.optional; |
| 2 | |
| 3 | |
| 4 | import java.sql.SQLException; |
| 5 | import java.util.HashMap; |
| 6 | import java.util.Map; |
| 7 | |
| 8 | import javax.sql.XAConnection; |
| 9 | import javax.transaction.xa.XAException; |
| 10 | import javax.transaction.xa.XAResource; |
| 11 | import javax.transaction.xa.Xid; |
| 12 | |
| 13 | import com.mysql.jdbc.Connection; |
| 14 | |
| 15 | public class SuspendableXAConnection extends MysqlPooledConnection implements |
| 16 | XAConnection, XAResource { |
| 17 | |
| 18 | public SuspendableXAConnection(Connection connection) { |
| 19 | super(connection); |
| 20 | this.underlyingConnection = connection; |
| 21 | } |
| 22 | |
| 23 | private static final Map XIDS_TO_PHYSICAL_CONNECTIONS = |
| 24 | new HashMap(); |
| 25 | |
| 26 | private Xid currentXid; |
| 27 | |
| 28 | private XAConnection currentXAConnection; |
| 29 | private XAResource currentXAResource; |
| 30 | |
| 31 | private Connection underlyingConnection; |
| 32 | |
| 33 | private static synchronized XAConnection findConnectionForXid(Connection connectionToWrap, Xid xid) |
| 34 | throws SQLException { |
| 35 | // TODO: check for same GTRID, but different BQUALs...MySQL doesn't allow this yet |
| 36 | |
| 37 | // Note, we don't need to check for XIDs here, because MySQL itself will complain |
| 38 | // with a XAER_NOTA if need be. |
| 39 | |
| 40 | XAConnection conn = (XAConnection)XIDS_TO_PHYSICAL_CONNECTIONS.get(xid); |
| 41 | |
| 42 | if (conn == null) { |
| 43 | conn = new MysqlXAConnection(connectionToWrap); |
| 44 | } |
| 45 | |
| 46 | return conn; |
| 47 | } |
| 48 | |
| 49 | private static synchronized void removeXAConnectionMapping(Xid xid) { |
| 50 | XIDS_TO_PHYSICAL_CONNECTIONS.remove(xid); |
| 51 | } |
| 52 | |
| 53 | private synchronized void switchToXid(Xid xid) throws XAException { |
| 54 | if (xid == null) { |
| 55 | throw new XAException(); |
| 56 | } |
| 57 | |
| 58 | try { |
| 59 | if (!xid.equals(this.currentXid)) { |
| 60 | XAConnection toSwitchTo = findConnectionForXid(this.underlyingConnection, xid); |
| 61 | this.currentXAConnection = toSwitchTo; |
| 62 | this.currentXid = xid; |
| 63 | this.currentXAResource = toSwitchTo.getXAResource(); |
| 64 | } |
| 65 | } catch (SQLException sqlEx) { |
| 66 | throw new XAException(); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | public XAResource getXAResource() throws SQLException { |
| 71 | return this; |
| 72 | } |
| 73 | |
| 74 | public void commit(Xid xid, boolean arg1) throws XAException { |
| 75 | switchToXid(xid); |
| 76 | this.currentXAResource.commit(xid, arg1); |
| 77 | removeXAConnectionMapping(xid); |
| 78 | } |
| 79 | |
| 80 | public void end(Xid xid, int arg1) throws XAException { |
| 81 | switchToXid(xid); |
| 82 | this.currentXAResource.end(xid, arg1); |
| 83 | } |
| 84 | |
| 85 | public void forget(Xid xid) throws XAException { |
| 86 | switchToXid(xid); |
| 87 | this.currentXAResource.forget(xid); |
| 88 | // remove? |
| 89 | removeXAConnectionMapping(xid); |
| 90 | } |
| 91 | |
| 92 | public int getTransactionTimeout() throws XAException { |
| 93 | // TODO Auto-generated method stub |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | public boolean isSameRM(XAResource xaRes) throws XAException { |
| 98 | return xaRes == this; |
| 99 | } |
| 100 | |
| 101 | public int prepare(Xid xid) throws XAException { |
| 102 | switchToXid(xid); |
| 103 | return this.currentXAResource.prepare(xid); |
| 104 | } |
| 105 | |
| 106 | public Xid[] recover(int flag) throws XAException { |
| 107 | return MysqlXAConnection.recover(this.underlyingConnection, flag); |
| 108 | } |
| 109 | |
| 110 | public void rollback(Xid xid) throws XAException { |
| 111 | switchToXid(xid); |
| 112 | this.currentXAResource.rollback(xid); |
| 113 | removeXAConnectionMapping(xid); |
| 114 | } |
| 115 | |
| 116 | public boolean setTransactionTimeout(int arg0) throws XAException { |
| 117 | // TODO Auto-generated method stub |
| 118 | return false; |
| 119 | } |
| 120 | |
| 121 | public void start(Xid xid, int arg1) throws XAException { |
| 122 | switchToXid(xid); |
| 123 | |
| 124 | if (arg1 != XAResource.TMJOIN) { |
| 125 | this.currentXAResource.start(xid, arg1); |
| 126 | |
| 127 | return; |
| 128 | } |
| 129 | |
| 130 | // |
| 131 | // Emulate join, by using resume on the same physical connection |
| 132 | // |
| 133 | |
| 134 | this.currentXAResource.start(xid, XAResource.TMRESUME); |
| 135 | } |
| 136 | |
| 137 | public synchronized java.sql.Connection getConnection() throws SQLException { |
| 138 | if (this.currentXAConnection == null) { |
| 139 | return getConnection(false, true); |
| 140 | } |
| 141 | |
| 142 | return this.currentXAConnection.getConnection(); |
| 143 | } |
| 144 | |
| 145 | public void close() throws SQLException { |
| 146 | if (this.currentXAConnection == null) { |
| 147 | super.close(); |
| 148 | } else { |
| 149 | removeXAConnectionMapping(this.currentXid); |
| 150 | this.currentXAConnection.close(); |
| 151 | } |
| 152 | } |
| 153 | } |