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An easy-to-use Spring bridge for MyBatis sql mapping framework.
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/**
 *    Copyright 2010-2016 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.mybatis.spring;

import static org.springframework.util.Assert.notNull;

import org.apache.ibatis.session.ExecutorType;
import org.apache.ibatis.session.SqlSession;
import org.springframework.dao.support.PersistenceExceptionTranslator;
import org.springframework.transaction.support.ResourceHolderSupport;

/**
 * Used to keep current {@code SqlSession} in {@code TransactionSynchronizationManager}.
 * The {@code SqlSessionFactory} that created that {@code SqlSession} is used as a key.
 * {@code ExecutorType} is also kept to be able to check if the user is trying to change it
 * during a TX (that is not allowed) and throw a Exception in that case.
 *
 * @author Hunter Presnall
 * @author Eduardo Macarron
 */
public final class SqlSessionHolder extends ResourceHolderSupport {

  private final SqlSession sqlSession;

  private final ExecutorType executorType;

  private final PersistenceExceptionTranslator exceptionTranslator;

  /**
   * Creates a new holder instance.
   *
   * @param sqlSession the {@code SqlSession} has to be hold.
   * @param executorType the {@code ExecutorType} has to be hold.
   */
  public SqlSessionHolder(SqlSession sqlSession,
      ExecutorType executorType,
      PersistenceExceptionTranslator exceptionTranslator) {

    notNull(sqlSession, "SqlSession must not be null");
    notNull(executorType, "ExecutorType must not be null");

    this.sqlSession = sqlSession;
    this.executorType = executorType;
    this.exceptionTranslator = exceptionTranslator;
  }

  public SqlSession getSqlSession() {
    return sqlSession;
  }

  public ExecutorType getExecutorType() {
    return executorType;
  }

  public PersistenceExceptionTranslator getPersistenceExceptionTranslator() {
    return exceptionTranslator;
  }

}