com.ibatis.sqlmap.engine.transaction.jta.JtaTransaction Maven / Gradle / Ivy

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/*
 * Copyright 2004-2022 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.ibatis.sqlmap.engine.transaction.jta;

import com.ibatis.common.jdbc.logging.ConnectionLogProxy;
import com.ibatis.common.logging.Log;
import com.ibatis.common.logging.LogFactory;
import com.ibatis.sqlmap.engine.transaction.IsolationLevel;
import com.ibatis.sqlmap.engine.transaction.Transaction;
import com.ibatis.sqlmap.engine.transaction.TransactionException;

import java.sql.Connection;
import java.sql.SQLException;

import javax.sql.DataSource;
import javax.transaction.Status;
import javax.transaction.UserTransaction;

/**
 * The Class JtaTransaction.
 */
public class JtaTransaction implements Transaction {

  /** The Constant connectionLog. */
  private static final Log connectionLog = LogFactory.getLog(Connection.class);

  /** The user transaction. */
  private UserTransaction userTransaction;

  /** The data source. */
  private DataSource dataSource;

  /** The connection. */
  private Connection connection;

  /** The isolation level. */
  private IsolationLevel isolationLevel = new IsolationLevel();

  /** The commmitted. */
  private boolean commmitted = false;

  /** The new transaction. */
  private boolean newTransaction = false;

  /**
   * Instantiates a new jta transaction.
   *
   * @param utx
   *          the utx
   * @param ds
   *          the ds
   * @param isolationLevel
   *          the isolation level
   *
   * @throws TransactionException
   *           the transaction exception
   */
  public JtaTransaction(UserTransaction utx, DataSource ds, int isolationLevel) throws TransactionException {
    // Check parameters
    userTransaction = utx;
    dataSource = ds;
    if (userTransaction == null) {
      throw new TransactionException("JtaTransaction initialization failed.  UserTransaction was null.");
    }
    if (dataSource == null) {
      throw new TransactionException("JtaTransaction initialization failed.  DataSource was null.");
    }
    this.isolationLevel.setIsolationLevel(isolationLevel);
  }

  /**
   * Inits the.
   *
   * @throws TransactionException
   *           the transaction exception
   * @throws SQLException
   *           the SQL exception
   */
  private void init() throws TransactionException, SQLException {
    // Start JTA Transaction
    try {
      newTransaction = userTransaction.getStatus() == Status.STATUS_NO_TRANSACTION;
      if (newTransaction) {
        userTransaction.begin();
      }
    } catch (Exception e) {
      throw new TransactionException("JtaTransaction could not start transaction.  Cause: ", e);
    }

    // Open JDBC Connection
    connection = dataSource.getConnection();
    if (connection == null) {
      throw new TransactionException(
          "JtaTransaction could not start transaction.  Cause: The DataSource returned a null connection.");
    }
    // Isolation Level
    isolationLevel.applyIsolationLevel(connection);
    // AutoCommit
    if (connection.getAutoCommit()) {
      connection.setAutoCommit(false);
    }
    // Debug
    if (connectionLog.isDebugEnabled()) {
      connection = ConnectionLogProxy.newInstance(connection);
    }
  }

  public void commit() throws SQLException, TransactionException {
    if (connection != null) {
      if (commmitted) {
        throw new TransactionException(
            "JtaTransaction could not commit because this transaction has already been committed.");
      }
      try {
        if (newTransaction) {
          userTransaction.commit();
        }
      } catch (Exception e) {
        throw new TransactionException("JtaTransaction could not commit.  Cause: ", e);
      }
      commmitted = true;
    }
  }

  public void rollback() throws SQLException, TransactionException {
    if (connection != null) {
      if (!commmitted) {
        try {
          if (userTransaction != null) {
            if (newTransaction) {
              userTransaction.rollback();
            } else {
              userTransaction.setRollbackOnly();
            }
          }
        } catch (Exception e) {
          throw new TransactionException("JtaTransaction could not rollback.  Cause: ", e);
        }
      }
    }
  }

  public void close() throws SQLException, TransactionException {
    if (connection != null) {
      try {
        isolationLevel.restoreIsolationLevel(connection);
      } finally {
        connection.close();
        connection = null;
      }
    }
  }

  public Connection getConnection() throws SQLException, TransactionException {
    if (connection == null) {
      init();
    }
    return connection;
  }

}