spring HibernateJpaDialect 源码

spring HibernateJpaDialect 代码

文件路径：/spring-orm/src/main/java/org/springframework/orm/jpa/vendor/HibernateJpaDialect.java

/*
 * Copyright 2002-2022 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 org.springframework.orm.jpa.vendor;

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

import jakarta.persistence.EntityManager;
import jakarta.persistence.PersistenceException;
import org.hibernate.ConnectionReleaseMode;
import org.hibernate.FlushMode;
import org.hibernate.HibernateException;
import org.hibernate.JDBCException;
import org.hibernate.NonUniqueObjectException;
import org.hibernate.NonUniqueResultException;
import org.hibernate.ObjectDeletedException;
import org.hibernate.PersistentObjectException;
import org.hibernate.PessimisticLockException;
import org.hibernate.PropertyValueException;
import org.hibernate.QueryException;
import org.hibernate.QueryTimeoutException;
import org.hibernate.Session;
import org.hibernate.StaleObjectStateException;
import org.hibernate.StaleStateException;
import org.hibernate.TransientObjectException;
import org.hibernate.UnresolvableObjectException;
import org.hibernate.WrongClassException;
import org.hibernate.dialect.lock.OptimisticEntityLockException;
import org.hibernate.dialect.lock.PessimisticEntityLockException;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.exception.ConstraintViolationException;
import org.hibernate.exception.DataException;
import org.hibernate.exception.JDBCConnectionException;
import org.hibernate.exception.LockAcquisitionException;
import org.hibernate.exception.SQLGrammarException;

import org.springframework.dao.CannotAcquireLockException;
import org.springframework.dao.DataAccessException;
import org.springframework.dao.DataAccessResourceFailureException;
import org.springframework.dao.DataIntegrityViolationException;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.dao.IncorrectResultSizeDataAccessException;
import org.springframework.dao.InvalidDataAccessApiUsageException;
import org.springframework.dao.InvalidDataAccessResourceUsageException;
import org.springframework.dao.PessimisticLockingFailureException;
import org.springframework.jdbc.datasource.ConnectionHandle;
import org.springframework.jdbc.datasource.DataSourceUtils;
import org.springframework.jdbc.support.SQLExceptionTranslator;
import org.springframework.lang.Nullable;
import org.springframework.orm.ObjectOptimisticLockingFailureException;
import org.springframework.orm.ObjectRetrievalFailureException;
import org.springframework.orm.jpa.DefaultJpaDialect;
import org.springframework.orm.jpa.EntityManagerFactoryUtils;
import org.springframework.orm.jpa.JpaSystemException;
import org.springframework.transaction.InvalidIsolationLevelException;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionException;
import org.springframework.transaction.support.ResourceTransactionDefinition;

/**
 * {@link org.springframework.orm.jpa.JpaDialect} implementation for
 * Hibernate EntityManager.
 *
 * @author Juergen Hoeller
 * @author Costin Leau
 * @since 2.0
 * @see HibernateJpaVendorAdapter
 * @see org.hibernate.Session#setHibernateFlushMode
 * @see org.hibernate.Transaction#setTimeout
 */
@SuppressWarnings("serial")
public class HibernateJpaDialect extends DefaultJpaDialect {

	boolean prepareConnection = true;

	@Nullable
	private SQLExceptionTranslator jdbcExceptionTranslator;


	/**
	 * Set whether to prepare the underlying JDBC Connection of a transactional
	 * Hibernate Session, that is, whether to apply a transaction-specific
	 * isolation level and/or the transaction's read-only flag to the underlying
	 * JDBC Connection.
	 * <p>Default is "true". If you turn this flag off, JPA transaction management
	 * will not support per-transaction isolation levels anymore. It will not call
	 * {@code Connection.setReadOnly(true)} for read-only transactions anymore either.
	 * If this flag is turned off, no cleanup of a JDBC Connection is required after
	 * a transaction, since no Connection settings will get modified.
	 * <p><b>NOTE:</b> The default behavior in terms of read-only handling changed
	 * in Spring 4.1, propagating the read-only status to the JDBC Connection now,
	 * analogous to other Spring transaction managers. This may have the effect
	 * that you're running into read-only enforcement now where previously write
	 * access has accidentally been tolerated: Please revise your transaction
	 * declarations accordingly, removing invalid read-only markers if necessary.
	 * @since 4.1
	 * @see java.sql.Connection#setTransactionIsolation
	 * @see java.sql.Connection#setReadOnly
	 */
	public void setPrepareConnection(boolean prepareConnection) {
		this.prepareConnection = prepareConnection;
	}

	/**
	 * Set the JDBC exception translator for Hibernate exception translation purposes.
	 * <p>Applied to any detected {@link java.sql.SQLException} root cause of a Hibernate
	 * {@link JDBCException}, overriding Hibernate's own {@code SQLException} translation
	 * (which is based on a Hibernate Dialect for a specific target database).
	 * @since 5.1
	 * @see java.sql.SQLException
	 * @see org.hibernate.JDBCException
	 * @see org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator
	 * @see org.springframework.jdbc.support.SQLStateSQLExceptionTranslator
	 */
	public void setJdbcExceptionTranslator(SQLExceptionTranslator jdbcExceptionTranslator) {
		this.jdbcExceptionTranslator = jdbcExceptionTranslator;
	}


	@Override
	public Object beginTransaction(EntityManager entityManager, TransactionDefinition definition)
			throws PersistenceException, SQLException, TransactionException {

		SessionImplementor session = getSession(entityManager);

		if (definition.getTimeout() != TransactionDefinition.TIMEOUT_DEFAULT) {
			session.getTransaction().setTimeout(definition.getTimeout());
		}

		boolean isolationLevelNeeded = (definition.getIsolationLevel() != TransactionDefinition.ISOLATION_DEFAULT);
		Integer previousIsolationLevel = null;
		Connection preparedCon = null;

		if (isolationLevelNeeded || definition.isReadOnly()) {
			if (this.prepareConnection && ConnectionReleaseMode.ON_CLOSE.equals(
					session.getJdbcCoordinator().getLogicalConnection().getConnectionHandlingMode().getReleaseMode())) {
				preparedCon = session.getJdbcCoordinator().getLogicalConnection().getPhysicalConnection();
				previousIsolationLevel = DataSourceUtils.prepareConnectionForTransaction(preparedCon, definition);
			}
			else if (isolationLevelNeeded) {
				throw new InvalidIsolationLevelException(
						"HibernateJpaDialect is not allowed to support custom isolation levels: " +
						"make sure that its 'prepareConnection' flag is on (the default) and that the " +
						"Hibernate connection release mode is set to ON_CLOSE.");
			}
		}

		// Standard JPA transaction begin call for full JPA context setup...
		entityManager.getTransaction().begin();

		// Adapt flush mode and store previous isolation level, if any.
		FlushMode previousFlushMode = prepareFlushMode(session, definition.isReadOnly());
		if (definition instanceof ResourceTransactionDefinition &&
				((ResourceTransactionDefinition) definition).isLocalResource()) {
			// As of 5.1, we explicitly optimize for a transaction-local EntityManager,
			// aligned with native HibernateTransactionManager behavior.
			previousFlushMode = null;
			if (definition.isReadOnly()) {
				session.setDefaultReadOnly(true);
			}
		}
		return new SessionTransactionData(
				session, previousFlushMode, (preparedCon != null), previousIsolationLevel, definition.isReadOnly());
	}

	@Override
	public Object prepareTransaction(EntityManager entityManager, boolean readOnly, @Nullable String name)
			throws PersistenceException {

		SessionImplementor session = getSession(entityManager);
		FlushMode previousFlushMode = prepareFlushMode(session, readOnly);
		return new SessionTransactionData(session, previousFlushMode, false, null, readOnly);
	}

	@Nullable
	protected FlushMode prepareFlushMode(Session session, boolean readOnly) throws PersistenceException {
		FlushMode flushMode = session.getHibernateFlushMode();
		if (readOnly) {
			// We should suppress flushing for a read-only transaction.
			if (!flushMode.equals(FlushMode.MANUAL)) {
				session.setHibernateFlushMode(FlushMode.MANUAL);
				return flushMode;
			}
		}
		else {
			// We need AUTO or COMMIT for a non-read-only transaction.
			if (flushMode.lessThan(FlushMode.COMMIT)) {
				session.setHibernateFlushMode(FlushMode.AUTO);
				return flushMode;
			}
		}
		// No FlushMode change needed...
		return null;
	}

	@Override
	public void cleanupTransaction(@Nullable Object transactionData) {
		if (transactionData instanceof SessionTransactionData) {
			((SessionTransactionData) transactionData).resetSessionState();
		}
	}

	@Override
	public ConnectionHandle getJdbcConnection(EntityManager entityManager, boolean readOnly)
			throws PersistenceException, SQLException {

		SessionImplementor session = getSession(entityManager);
		return new HibernateConnectionHandle(session);
	}

	@Override
	@Nullable
	public DataAccessException translateExceptionIfPossible(RuntimeException ex) {
		if (ex instanceof HibernateException) {
			return convertHibernateAccessException((HibernateException) ex);
		}
		if (ex instanceof PersistenceException && ex.getCause() instanceof HibernateException) {
			return convertHibernateAccessException((HibernateException) ex.getCause());
		}
		return EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(ex);
	}

	/**
	 * Convert the given HibernateException to an appropriate exception
	 * from the {@code org.springframework.dao} hierarchy.
	 * @param ex the HibernateException that occurred
	 * @return the corresponding DataAccessException instance
	 */
	protected DataAccessException convertHibernateAccessException(HibernateException ex) {
		if (this.jdbcExceptionTranslator != null && ex instanceof JDBCException jdbcEx) {
			DataAccessException dae = this.jdbcExceptionTranslator.translate(
					"Hibernate operation: " + jdbcEx.getMessage(), jdbcEx.getSQL(), jdbcEx.getSQLException());
			if (dae != null) {
				throw dae;
			}
		}

		if (ex instanceof JDBCConnectionException) {
			return new DataAccessResourceFailureException(ex.getMessage(), ex);
		}
		if (ex instanceof SQLGrammarException jdbcEx) {
			return new InvalidDataAccessResourceUsageException(ex.getMessage() + "; SQL [" + jdbcEx.getSQL() + "]", ex);
		}
		if (ex instanceof QueryTimeoutException jdbcEx) {
			return new org.springframework.dao.QueryTimeoutException(ex.getMessage() + "; SQL [" + jdbcEx.getSQL() + "]", ex);
		}
		if (ex instanceof LockAcquisitionException jdbcEx) {
			return new CannotAcquireLockException(ex.getMessage() + "; SQL [" + jdbcEx.getSQL() + "]", ex);
		}
		if (ex instanceof PessimisticLockException jdbcEx) {
			return new PessimisticLockingFailureException(ex.getMessage() + "; SQL [" + jdbcEx.getSQL() + "]", ex);
		}
		if (ex instanceof ConstraintViolationException jdbcEx) {
			return new DataIntegrityViolationException(ex.getMessage()  + "; SQL [" + jdbcEx.getSQL() +
					"]; constraint [" + jdbcEx.getConstraintName() + "]", ex);
		}
		if (ex instanceof DataException jdbcEx) {
			return new DataIntegrityViolationException(ex.getMessage() + "; SQL [" + jdbcEx.getSQL() + "]", ex);
		}
		// end of JDBCException subclass handling

		if (ex instanceof QueryException) {
			return new InvalidDataAccessResourceUsageException(ex.getMessage(), ex);
		}
		if (ex instanceof NonUniqueResultException) {
			return new IncorrectResultSizeDataAccessException(ex.getMessage(), 1, ex);
		}
		if (ex instanceof NonUniqueObjectException) {
			return new DuplicateKeyException(ex.getMessage(), ex);
		}
		if (ex instanceof PropertyValueException) {
			return new DataIntegrityViolationException(ex.getMessage(), ex);
		}
		if (ex instanceof PersistentObjectException) {
			return new InvalidDataAccessApiUsageException(ex.getMessage(), ex);
		}
		if (ex instanceof TransientObjectException) {
			return new InvalidDataAccessApiUsageException(ex.getMessage(), ex);
		}
		if (ex instanceof ObjectDeletedException) {
			return new InvalidDataAccessApiUsageException(ex.getMessage(), ex);
		}
		if (ex instanceof UnresolvableObjectException hibEx) {
			return new ObjectRetrievalFailureException(hibEx.getEntityName(), hibEx.getIdentifier(), ex.getMessage(), ex);
		}
		if (ex instanceof WrongClassException hibEx) {
			return new ObjectRetrievalFailureException(hibEx.getEntityName(), hibEx.getIdentifier(), ex.getMessage(), ex);
		}
		if (ex instanceof StaleObjectStateException hibEx) {
			return new ObjectOptimisticLockingFailureException(hibEx.getEntityName(), hibEx.getIdentifier(), ex);
		}
		if (ex instanceof StaleStateException) {
			return new ObjectOptimisticLockingFailureException(ex.getMessage(), ex);
		}
		if (ex instanceof OptimisticEntityLockException) {
			return new ObjectOptimisticLockingFailureException(ex.getMessage(), ex);
		}
		if (ex instanceof PessimisticEntityLockException) {
			if (ex.getCause() instanceof LockAcquisitionException) {
				return new CannotAcquireLockException(ex.getMessage(), ex.getCause());
			}
			return new PessimisticLockingFailureException(ex.getMessage(), ex);
		}

		// fallback
		return new JpaSystemException(ex);
	}

	protected SessionImplementor getSession(EntityManager entityManager) {
		return entityManager.unwrap(SessionImplementor.class);
	}


	private static class SessionTransactionData {

		private final SessionImplementor session;

		@Nullable
		private final FlushMode previousFlushMode;

		private final boolean needsConnectionReset;

		@Nullable
		private final Integer previousIsolationLevel;

		private final boolean readOnly;

		public SessionTransactionData(SessionImplementor session, @Nullable FlushMode previousFlushMode,
				boolean connectionPrepared, @Nullable Integer previousIsolationLevel, boolean readOnly) {

			this.session = session;
			this.previousFlushMode = previousFlushMode;
			this.needsConnectionReset = connectionPrepared;
			this.previousIsolationLevel = previousIsolationLevel;
			this.readOnly = readOnly;
		}

		public void resetSessionState() {
			if (this.previousFlushMode != null) {
				this.session.setHibernateFlushMode(this.previousFlushMode);
			}
			if (this.needsConnectionReset &&
					this.session.getJdbcCoordinator().getLogicalConnection().isPhysicallyConnected()) {
				Connection con = this.session.getJdbcCoordinator().getLogicalConnection().getPhysicalConnection();
				DataSourceUtils.resetConnectionAfterTransaction(
						con, this.previousIsolationLevel, this.readOnly);
			}
		}
	}


	private static class HibernateConnectionHandle implements ConnectionHandle {

		private final SessionImplementor session;

		public HibernateConnectionHandle(SessionImplementor session) {
			this.session = session;
		}

		@Override
		public Connection getConnection() {
			return this.session.getJdbcCoordinator().getLogicalConnection().getPhysicalConnection();
		}
	}

}

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