| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.client.ClientXAConnection |
| 4 | |
| 5 | Copyright (c) 2003, 2005 The Apache Software Foundation or its licensors, where applicable. |
| 6 | |
| 7 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | you may not use this file except in compliance with the License. |
| 9 | You may obtain a copy of the License at |
| 10 | |
| 11 | http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | |
| 13 | Unless required by applicable law or agreed to in writing, software |
| 14 | distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | See the License for the specific language governing permissions and |
| 17 | limitations under the License. |
| 18 | |
| 19 | */ |
| 20 | package org.apache.derby.client; |
| 21 | |
| 22 | import java.sql.Connection; |
| 23 | import java.sql.SQLException; |
| 24 | import javax.sql.XAConnection; |
| 25 | import javax.transaction.xa.XAResource; |
| 26 | |
| 27 | import org.apache.derby.client.am.SqlException; |
| 28 | import org.apache.derby.client.net.NetLogWriter; |
| 29 | import org.apache.derby.client.net.NetXAConnection; |
| 30 | import org.apache.derby.jdbc.ClientXADataSource; |
| 31 | |
| 32 | public class ClientXAConnection extends ClientPooledConnection implements XAConnection { |
| 33 | private static int rmIdSeed_ = 95688932; // semi-random starting value for rmId |
| 34 | |
| 35 | private ClientXADataSource derbyds_ = null; |
| 36 | private XAResource xares_ = null; |
| 37 | private org.apache.derby.client.net.NetXAResource netXares_ = null; |
| 38 | private boolean fFirstGetConnection_ = true; |
| 39 | private Connection logicalCon_; // logicalConnection_ is inherited from ClientPooledConnection |
| 40 | // This connection is used to access the indoubt table |
| 41 | private NetXAConnection controlCon_ = null; |
| 42 | |
| 43 | public ClientXAConnection(ClientXADataSource ds, |
| 44 | org.apache.derby.client.net.NetLogWriter logWtr, |
| 45 | String userId, |
| 46 | String password) throws SQLException { |
| 47 | super(ds, logWtr, userId, password, getUnigueRmId()); |
| 48 | derbyds_ = ds; |
| 49 | |
| 50 | // Have to instantiate a real connection here, |
| 51 | // otherwise if XA function is called before the connect happens, |
| 52 | // an error will be returned |
| 53 | // Note: conApp will be set after this call |
| 54 | logicalCon_ = super.getConnection(); |
| 55 | |
| 56 | netXares_ = new org.apache.derby.client.net.NetXAResource(this, |
| 57 | rmId_, userId, password, netXAPhysicalConnection_); |
| 58 | xares_ = netXares_; |
| 59 | } |
| 60 | |
| 61 | public Connection getConnection() throws SQLException { |
| 62 | if (fFirstGetConnection_) { |
| 63 | // Since super.getConnection() has already been called once |
| 64 | // in the constructor, we don't need to call it again for the |
| 65 | // call of this method. |
| 66 | fFirstGetConnection_ = false; |
| 67 | } else { |
| 68 | // A new connection object is required |
| 69 | logicalCon_ = super.getConnection(); |
| 70 | if (this.physicalConnection_ != null) { // have a physical connection, check if a NetXAResource |
| 71 | if (netXAPhysicalConnection_ != null) { // the XAResource is a NetXAResource, re-initialize it |
| 72 | netXares_.initForReuse(); |
| 73 | } |
| 74 | } |
| 75 | } |
| 76 | return logicalCon_; |
| 77 | } |
| 78 | |
| 79 | private static synchronized int getUnigueRmId() { |
| 80 | rmIdSeed_ += 1; |
| 81 | return rmIdSeed_; |
| 82 | } |
| 83 | |
| 84 | public int getRmId() { |
| 85 | return rmId_; |
| 86 | } |
| 87 | |
| 88 | public XAResource getXAResource() throws SQLException { |
| 89 | if (logWriter_ != null) { |
| 90 | logWriter_.traceExit(this, "getXAResource", xares_); |
| 91 | } |
| 92 | |
| 93 | return xares_; |
| 94 | } |
| 95 | |
| 96 | public ClientXADataSource getDataSource() throws SqlException { |
| 97 | if (logWriter_ != null) { |
| 98 | logWriter_.traceExit(this, "getDataSource", derbyds_); |
| 99 | } |
| 100 | |
| 101 | return derbyds_; |
| 102 | } |
| 103 | |
| 104 | public NetXAConnection createControlConnection(NetLogWriter logWriter, |
| 105 | String user, |
| 106 | String password, |
| 107 | org.apache.derby.jdbc.ClientDataSource dataSource, |
| 108 | int rmId, |
| 109 | boolean isXAConn) throws SQLException { |
| 110 | try |
| 111 | { |
| 112 | controlCon_ = new NetXAConnection(logWriter, |
| 113 | user, |
| 114 | password, |
| 115 | dataSource, |
| 116 | rmId, |
| 117 | isXAConn, |
| 118 | this); |
| 119 | controlCon_.getNetConnection().setTransactionIsolation( |
| 120 | Connection.TRANSACTION_READ_UNCOMMITTED); |
| 121 | |
| 122 | if (logWriter_ != null) { |
| 123 | logWriter_.traceExit(this, "createControlConnection", controlCon_); |
| 124 | } |
| 125 | |
| 126 | return controlCon_; |
| 127 | } |
| 128 | catch ( SqlException se ) |
| 129 | { |
| 130 | throw se.getSQLException(); |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | |
| 135 | public synchronized void close() throws SQLException { |
| 136 | super.close(); |
| 137 | } |
| 138 | } |
| 139 | |