Source Code Cross Referenced for JtaTransaction.java in  » Database-ORM » iBATIS » com » ibatis » sqlmap » engine » transaction » jta » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database ORM » iBATIS » com.ibatis.sqlmap.engine.transaction.jta 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Copyright 2004 Clinton Begin
003:         *
004:         *  Licensed under the Apache License, Version 2.0 (the "License");
005:         *  you may not use this file except in compliance with the License.
006:         *  You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         *  Unless required by applicable law or agreed to in writing, software
011:         *  distributed under the License is distributed on an "AS IS" BASIS,
012:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         *  See the License for the specific language governing permissions and
014:         *  limitations under the License.
015:         */
016:        package com.ibatis.sqlmap.engine.transaction.jta;
017:
018:        import com.ibatis.common.jdbc.logging.ConnectionLogProxy;
019:        import com.ibatis.common.logging.Log;
020:        import com.ibatis.common.logging.LogFactory;
021:        import com.ibatis.sqlmap.engine.transaction.IsolationLevel;
022:        import com.ibatis.sqlmap.engine.transaction.Transaction;
023:        import com.ibatis.sqlmap.engine.transaction.TransactionException;
024:
025:        import javax.sql.DataSource;
026:        import javax.transaction.Status;
027:        import javax.transaction.UserTransaction;
028:        import java.sql.Connection;
029:        import java.sql.SQLException;
030:
031:        public class JtaTransaction implements  Transaction {
032:
033:            private static final Log connectionLog = LogFactory
034:                    .getLog(Connection.class);
035:
036:            private UserTransaction userTransaction;
037:            private DataSource dataSource;
038:            private Connection connection;
039:            private IsolationLevel isolationLevel = new IsolationLevel();
040:
041:            private boolean commmitted = false;
042:            private boolean newTransaction = false;
043:
044:            public JtaTransaction(UserTransaction utx, DataSource ds,
045:                    int isolationLevel) throws TransactionException {
046:                // Check parameters
047:                userTransaction = utx;
048:                dataSource = ds;
049:                if (userTransaction == null) {
050:                    throw new TransactionException(
051:                            "JtaTransaction initialization failed.  UserTransaction was null.");
052:                }
053:                if (dataSource == null) {
054:                    throw new TransactionException(
055:                            "JtaTransaction initialization failed.  DataSource was null.");
056:                }
057:                this .isolationLevel.setIsolationLevel(isolationLevel);
058:            }
059:
060:            private void init() throws TransactionException, SQLException {
061:                // Start JTA Transaction
062:                try {
063:                    newTransaction = userTransaction.getStatus() == Status.STATUS_NO_TRANSACTION;
064:                    if (newTransaction) {
065:                        userTransaction.begin();
066:                    }
067:                } catch (Exception e) {
068:                    throw new TransactionException(
069:                            "JtaTransaction could not start transaction.  Cause: ",
070:                            e);
071:                }
072:
073:                // Open JDBC Connection
074:                connection = dataSource.getConnection();
075:                if (connection == null) {
076:                    throw new TransactionException(
077:                            "JtaTransaction could not start transaction.  Cause: The DataSource returned a null connection.");
078:                }
079:                // Isolation Level
080:                isolationLevel.applyIsolationLevel(connection);
081:                // AutoCommit
082:                if (connection.getAutoCommit()) {
083:                    connection.setAutoCommit(false);
084:                }
085:                // Debug
086:                if (connectionLog.isDebugEnabled()) {
087:                    connection = ConnectionLogProxy.newInstance(connection);
088:                }
089:            }
090:
091:            public void commit() throws SQLException, TransactionException {
092:                if (connection != null) {
093:                    if (commmitted) {
094:                        throw new TransactionException(
095:                                "JtaTransaction could not commit because this transaction has already been committed.");
096:                    }
097:                    try {
098:                        if (newTransaction) {
099:                            userTransaction.commit();
100:                        }
101:                    } catch (Exception e) {
102:                        throw new TransactionException(
103:                                "JtaTransaction could not commit.  Cause: ", e);
104:                    }
105:                    commmitted = true;
106:                }
107:            }
108:
109:            public void rollback() throws SQLException, TransactionException {
110:                if (connection != null) {
111:                    if (!commmitted) {
112:                        try {
113:                            if (userTransaction != null) {
114:                                if (newTransaction) {
115:                                    userTransaction.rollback();
116:                                } else {
117:                                    userTransaction.setRollbackOnly();
118:                                }
119:                            }
120:                        } catch (Exception e) {
121:                            throw new TransactionException(
122:                                    "JtaTransaction could not rollback.  Cause: ",
123:                                    e);
124:                        }
125:                    }
126:                }
127:            }
128:
129:            public void close() throws SQLException, TransactionException {
130:                if (connection != null) {
131:                    try {
132:                        isolationLevel.restoreIsolationLevel(connection);
133:                    } finally {
134:                        connection.close();
135:                        connection = null;
136:                    }
137:                }
138:            }
139:
140:            public Connection getConnection() throws SQLException,
141:                    TransactionException {
142:                if (connection == null) {
143:                    init();
144:                }
145:                return connection;
146:            }
147:
148:        }
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