Package org.springframework.jdbc.datasource

Source Code of org.springframework.jdbc.datasource.JdbcTransactionObjectSupport

/*
* Copyright 2002-2014 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
*
*      http://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 org.springframework.jdbc.datasource;

import java.sql.SQLException;
import java.sql.Savepoint;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.transaction.CannotCreateTransactionException;
import org.springframework.transaction.NestedTransactionNotSupportedException;
import org.springframework.transaction.SavepointManager;
import org.springframework.transaction.TransactionException;
import org.springframework.transaction.TransactionSystemException;
import org.springframework.transaction.TransactionUsageException;
import org.springframework.transaction.support.SmartTransactionObject;

/**
* Convenient base class for JDBC-aware transaction objects.
* Can contain a {@link ConnectionHolder}, and implements the
* {@link org.springframework.transaction.SavepointManager}
* interface based on that ConnectionHolder.
*
* <p>Allows for programmatic management of JDBC 3.0
* {@link java.sql.Savepoint Savepoints}. Spring's
* {@link org.springframework.transaction.support.DefaultTransactionStatus}
* will automatically delegate to this, as it autodetects transaction
* objects that implement the SavepointManager interface.
*
* @author Juergen Hoeller
* @since 1.1
*/
public abstract class JdbcTransactionObjectSupport implements SavepointManager, SmartTransactionObject {

  private static final Log logger = LogFactory.getLog(JdbcTransactionObjectSupport.class);


  private ConnectionHolder connectionHolder;

  private Integer previousIsolationLevel;

  private boolean savepointAllowed = false;


  public void setConnectionHolder(ConnectionHolder connectionHolder) {
    this.connectionHolder = connectionHolder;
  }

  public ConnectionHolder getConnectionHolder() {
    return this.connectionHolder;
  }

  public boolean hasConnectionHolder() {
    return (this.connectionHolder != null);
  }

  public void setPreviousIsolationLevel(Integer previousIsolationLevel) {
    this.previousIsolationLevel = previousIsolationLevel;
  }

  public Integer getPreviousIsolationLevel() {
    return this.previousIsolationLevel;
  }

  public void setSavepointAllowed(boolean savepointAllowed) {
    this.savepointAllowed = savepointAllowed;
  }

  public boolean isSavepointAllowed() {
    return this.savepointAllowed;
  }

  @Override
  public void flush() {
    // no-op
  }


  //---------------------------------------------------------------------
  // Implementation of SavepointManager
  //---------------------------------------------------------------------

  /**
   * This implementation creates a JDBC 3.0 Savepoint and returns it.
   * @see java.sql.Connection#setSavepoint
   */
  @Override
  public Object createSavepoint() throws TransactionException {
    ConnectionHolder conHolder = getConnectionHolderForSavepoint();
    try {
      if (!conHolder.supportsSavepoints()) {
        throw new NestedTransactionNotSupportedException(
            "Cannot create a nested transaction because savepoints are not supported by your JDBC driver");
      }
      return conHolder.createSavepoint();
    }
    catch (SQLException ex) {
      throw new CannotCreateTransactionException("Could not create JDBC savepoint", ex);
    }
  }

  /**
   * This implementation rolls back to the given JDBC 3.0 Savepoint.
   * @see java.sql.Connection#rollback(java.sql.Savepoint)
   */
  @Override
  public void rollbackToSavepoint(Object savepoint) throws TransactionException {
    ConnectionHolder conHolder = getConnectionHolderForSavepoint();
    try {
      conHolder.getConnection().rollback((Savepoint) savepoint);
    }
    catch (Throwable ex) {
      throw new TransactionSystemException("Could not roll back to JDBC savepoint", ex);
    }
  }

  /**
   * This implementation releases the given JDBC 3.0 Savepoint.
   * @see java.sql.Connection#releaseSavepoint
   */
  @Override
  public void releaseSavepoint(Object savepoint) throws TransactionException {
    ConnectionHolder conHolder = getConnectionHolderForSavepoint();
    try {
      conHolder.getConnection().releaseSavepoint((Savepoint) savepoint);
    }
    catch (Throwable ex) {
      logger.debug("Could not explicitly release JDBC savepoint", ex);
    }
  }

  protected ConnectionHolder getConnectionHolderForSavepoint() throws TransactionException {
    if (!isSavepointAllowed()) {
      throw new NestedTransactionNotSupportedException(
          "Transaction manager does not allow nested transactions");
    }
    if (!hasConnectionHolder()) {
      throw new TransactionUsageException(
          "Cannot create nested transaction if not exposing a JDBC transaction");
    }
    return getConnectionHolder();
  }

}
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