Java Environment.getTransactionFactory方法代碼示例

import org.apache.ibatis.mapping.Environment; //導入方法依賴的package包/類
private Executor newExecutor() {
  final Environment environment = configuration.getEnvironment();
  if (environment == null) {
    throw new ExecutorException("ResultLoader could not load lazily.  Environment was not configured.");
  }
  final DataSource ds = environment.getDataSource();
  if (ds == null) {
    throw new ExecutorException("ResultLoader could not load lazily.  DataSource was not configured.");
  }
  final TransactionFactory transactionFactory = environment.getTransactionFactory();
  final Transaction tx = transactionFactory.newTransaction(ds, null, false);
  return configuration.newExecutor(tx, ExecutorType.SIMPLE);
}
 

import org.apache.ibatis.mapping.Environment; //導入方法依賴的package包/類
private TransactionFactory getTransactionFactoryFromEnvironment(Environment environment) {
  if (environment == null || environment.getTransactionFactory() == null) {
    // 源碼解析: 默認返回容器管理的事務工廠
    return new ManagedTransactionFactory();
  }
  // 源碼解析: 返回配置的事務工廠
  return environment.getTransactionFactory();
}
 

import org.apache.ibatis.mapping.Environment; //導入方法依賴的package包/類
private TransactionFactory getTransactionFactoryFromEnvironment(Environment environment) {
  //如果沒有配置事務工廠，則返回托管事務工廠
  if (environment == null || environment.getTransactionFactory() == null) {
    return new ManagedTransactionFactory();
  }
  return environment.getTransactionFactory();
}
 

import org.apache.ibatis.mapping.Environment; //導入方法依賴的package包/類
private Executor newExecutor() {
  final Environment environment = configuration.getEnvironment();
  if (environment == null) {
    throw new ExecutorException("ResultLoader could not load lazily.  Environment was not configured.");
  }
  final DataSource ds = environment.getDataSource();
  if (ds == null) {
    throw new ExecutorException("ResultLoader could not load lazily.  DataSource was not configured.");
  }
  final TransactionFactory transactionFactory = environment.getTransactionFactory();
  final Transaction tx = transactionFactory.newTransaction(ds, null, false);
  //如果executor已經被關閉了，則創建一個新的SimpleExecutor
  return configuration.newExecutor(tx, ExecutorType.SIMPLE);
}
 

import org.apache.ibatis.mapping.Environment; //導入方法依賴的package包/類
private TransactionFactory getTransactionFactoryFromEnvironment(Environment environment) {
  if (environment == null || environment.getTransactionFactory() == null) {
    return new ManagedTransactionFactory();
  }
  return environment.getTransactionFactory();
}
 

import org.apache.ibatis.mapping.Environment; //導入方法依賴的package包/類
private TransactionFactory getTransactionFactoryFromEnvironment(Environment environment) {
    if (environment == null || environment.getTransactionFactory() == null) {
        return new ManagedTransactionFactory();
    }
    return environment.getTransactionFactory();
}
 

import org.apache.ibatis.mapping.Environment; //導入方法依賴的package包/類
/**
 * Gets an SqlSession from Spring Transaction Manager or creates a new one if needed.
 * Tries to get a SqlSession out of current transaction. If there is not any, it creates a new one.
 * Then, it synchronizes the SqlSession with the transaction if Spring TX is active and
 * <code>SpringManagedTransactionFactory</code> is configured as a transaction manager.
 *
 * @param sessionFactory a MyBatis {@code SqlSessionFactory} to create new sessions
 * @param executorType The executor type of the SqlSession to create
 * @param exceptionTranslator Optional. Translates SqlSession.commit() exceptions to Spring exceptions.
 * @throws TransientDataAccessResourceException if a transaction is active and the
 *             {@code SqlSessionFactory} is not using a {@code SpringManagedTransactionFactory}
 * @see SpringManagedTransactionFactory
 */
public static SqlSession getSqlSession(SqlSessionFactory sessionFactory, ExecutorType executorType, PersistenceExceptionTranslator exceptionTranslator) {

  notNull(sessionFactory, "No SqlSessionFactory specified");
  notNull(executorType, "No ExecutorType specified");

  SqlSessionHolder holder = (SqlSessionHolder) TransactionSynchronizationManager.getResource(sessionFactory);

  if (holder != null && holder.isSynchronizedWithTransaction()) {
    if (holder.getExecutorType() != executorType) {
      throw new TransientDataAccessResourceException("Cannot change the ExecutorType when there is an existing transaction");
    }

    holder.requested();

    if (logger.isDebugEnabled()) {
      logger.debug("Fetched SqlSession [" + holder.getSqlSession() + "] from current transaction");
    }

    return holder.getSqlSession();
  }

  if (logger.isDebugEnabled()) {
    logger.debug("Creating a new SqlSession");
  }

  SqlSession session = sessionFactory.openSession(executorType);

  // Register session holder if synchronization is active (i.e. a Spring TX is active)
  //
  // Note: The DataSource used by the Environment should be synchronized with the
  // transaction either through DataSourceTxMgr or another tx synchronization.
  // Further assume that if an exception is thrown, whatever started the transaction will
  // handle closing / rolling back the Connection associated with the SqlSession.
  if (TransactionSynchronizationManager.isSynchronizationActive()) {
    Environment environment = sessionFactory.getConfiguration().getEnvironment();

    if (environment.getTransactionFactory() instanceof SpringManagedTransactionFactory) {
      if (logger.isDebugEnabled()) {
        logger.debug("Registering transaction synchronization for SqlSession [" + session + "]");
      }

      holder = new SqlSessionHolder(session, executorType, exceptionTranslator);
      TransactionSynchronizationManager.bindResource(sessionFactory, holder);
      TransactionSynchronizationManager.registerSynchronization(new SqlSessionSynchronization(holder, sessionFactory));
      holder.setSynchronizedWithTransaction(true);
      holder.requested();
    } else {
      if (TransactionSynchronizationManager.getResource(environment.getDataSource()) == null) {
        if (logger.isDebugEnabled()) {
          logger.debug("SqlSession [" + session + "] was not registered for synchronization because DataSource is not transactional");
        }
      } else {
        throw new TransientDataAccessResourceException(
            "SqlSessionFactory must be using a SpringManagedTransactionFactory in order to use Spring transaction synchronization");
      }
    }
  } else {
    if (logger.isDebugEnabled()) {
      logger.debug("SqlSession [" + session + "] was not registered for synchronization because synchronization is not active");
    }
  }

  return session;
}
 

import org.apache.ibatis.mapping.Environment; //導入方法依賴的package包/類
/**
 * Gets an SqlSession from Spring Transaction Manager or creates a new one if needed.
 * Tries to get a SqlSession out of current transaction. If there is not any, it creates a new one.
 * Then, it synchronizes the SqlSession with the transaction if Spring TX is active and
 * <code>SpringManagedTransactionFactory</code> is configured as a transaction manager.
 *
 * @param sessionFactory a MyBatis {@code SqlSessionFactory} to create new sessions
 * @param executorType The executor type of the SqlSession to create
 * @param exceptionTranslator Optional. Translates SqlSession.commit() exceptions to Spring exceptions.
 * @throws TransientDataAccessResourceException if a transaction is active and the
 *             {@code SqlSessionFactory} is not using a {@code SpringManagedTransactionFactory}
 * @see SpringManagedTransactionFactory
 */
public static SqlSession getSqlSession(SqlSessionFactory sessionFactory, ExecutorType executorType, PersistenceExceptionTranslator exceptionTranslator) {

  notNull(sessionFactory, "No SqlSessionFactory specified");
  notNull(executorType, "No ExecutorType specified");

  SqlSessionHolder holder = (SqlSessionHolder) getResource(sessionFactory);

  if (holder != null && holder.isSynchronizedWithTransaction()) {
    if (holder.getExecutorType() != executorType) {
      throw new TransientDataAccessResourceException("Cannot change the ExecutorType when there is an existing transaction");
    }

    holder.requested();

    if (logger.isDebugEnabled()) {
      logger.debug("Fetched SqlSession [" + holder.getSqlSession() + "] from current transaction");
    }

    return holder.getSqlSession();
  }

  if (logger.isDebugEnabled()) {
    logger.debug("Creating a new SqlSession");
  }

  SqlSession session = sessionFactory.openSession(executorType);

  // Register session holder if synchronization is active (i.e. a Spring TX is active)
  //
  // Note: The DataSource used by the Environment should be synchronized with the
  // transaction either through DataSourceTxMgr or another tx synchronization.
  // Further assume that if an exception is thrown, whatever started the transaction will
  // handle closing / rolling back the Connection associated with the SqlSession.
  if (isSynchronizationActive()) {
    Environment environment = sessionFactory.getConfiguration().getEnvironment();

    if (environment.getTransactionFactory() instanceof SpringManagedTransactionFactory) {
      if (logger.isDebugEnabled()) {
        logger.debug("Registering transaction synchronization for SqlSession [" + session + "]");
      }

      holder = new SqlSessionHolder(session, executorType, exceptionTranslator);
      bindResource(sessionFactory, holder);
      registerSynchronization(new SqlSessionSynchronization(holder, sessionFactory));
      holder.setSynchronizedWithTransaction(true);
      holder.requested();
    } else {
      if (getResource(environment.getDataSource()) == null) {
        if (logger.isDebugEnabled()) {
          logger.debug("SqlSession [" + session + "] was not registered for synchronization because DataSource is not transactional");
        }
      } else {
        throw new TransientDataAccessResourceException(
            "SqlSessionFactory must be using a SpringManagedTransactionFactory in order to use Spring transaction synchronization");
      }
    }
  } else {
    if (logger.isDebugEnabled()) {
      logger.debug("SqlSession [" + session + "] was not registered for synchronization because synchronization is not active");
    }
  }

  return session;
}