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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Middleware LLC.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 *
 */
package org.hibernate;

import java.io.Serializable;
import java.sql.Connection;

/**
 * A command-oriented API for performing bulk operations
 * against a database.<br>
 * <br>
 * A stateless session does not implement a first-level cache nor
 * interact with any second-level cache, nor does it implement
 * transactional write-behind or automatic dirty checking, nor do
 * operations cascade to associated instances. Collections are
 * ignored by a stateless session. Operations performed via a
 * stateless session bypass Hibernate's event model and
 * interceptors. Stateless sessions are vulnerable to data
 * aliasing effects, due to the lack of a first-level cache.<br>
 * <br>
 * For certain kinds of transactions, a stateless session may
 * perform slightly faster than a stateful session.
 *
 * @author Gavin King
 */
public interface StatelessSession extends Serializable {
        /**
         * Close the stateless session and release the JDBC connection.
         */
        public void close();

        /**
         * Insert a row.
         *
         * @param entity a new transient instance
         */
        public Serializable insert(Object entity);

        /**
         * Insert a row.
         *
         * @param entityName The entityName for the entity to be inserted
         * @param entity a new transient instance
         * @return the identifier of the instance
         */
        public Serializable insert(String entityName, Object entity);

        /**
         * Update a row.
         *
         * @param entity a detached entity instance
         */
        public void update(Object entity);

        /**
         * Update a row.
         *
         * @param entityName The entityName for the entity to be updated
         * @param entity a detached entity instance
         */
        public void update(String entityName, Object entity);

        /**
         * Delete a row.
         *
         * @param entity a detached entity instance
         */
        public void delete(Object entity);

        /**
         * Delete a row.
         *
         * @param entityName The entityName for the entity to be deleted
         * @param entity a detached entity instance
         */
        public void delete(String entityName, Object entity);

        /**
         * Retrieve a row.
         *
         * @return a detached entity instance
         */
        public Object get(String entityName, Serializable id);

        /**
         * Retrieve a row.
         *
         * @return a detached entity instance
         */
        public Object get(Class entityClass, Serializable id);

        /**
         * Retrieve a row, obtaining the specified lock mode.
         *
         * @return a detached entity instance
         */
        public Object get(String entityName, Serializable id, LockMode lockMode);

        /**
         * Retrieve a row, obtaining the specified lock mode.
         *
         * @return a detached entity instance
         */
        public Object get(Class entityClass, Serializable id, LockMode lockMode);

        /**
         * Refresh the entity instance state from the database.
         *
         * @param entity The entity to be refreshed.
         */
        public void refresh(Object entity);

        /**
         * Refresh the entity instance state from the database.
         *
         * @param entityName The entityName for the entity to be refreshed.
         * @param entity The entity to be refreshed.
         */
        public void refresh(String entityName, Object entity);

        /**
         * Refresh the entity instance state from the database.
         *
         * @param entity The entity to be refreshed.
         * @param lockMode The LockMode to be applied.
         */
        public void refresh(Object entity, LockMode lockMode);

        /**
         * Refresh the entity instance state from the database.
         *
         * @param entityName The entityName for the entity to be refreshed.
         * @param entity The entity to be refreshed.
         * @param lockMode The LockMode to be applied.
         */
        public void refresh(String entityName, Object entity, LockMode lockMode);

        /**
         * Create a new instance of <tt>Query</tt> for the given HQL query string.
         * Entities returned by the query are detached.
         */
        public Query createQuery(String queryString);

        /**
         * Obtain an instance of <tt>Query</tt> for a named query string defined in
         * the mapping file. Entities returned by the query are detached.
         */
        public Query getNamedQuery(String queryName);

        /**
         * Create a new <tt>Criteria</tt> instance, for the given entity class,
         * or a superclass of an entity class. Entities returned by the query are
         * detached.
         *
         * @param persistentClass a class, which is persistent, or has persistent subclasses
         * @return Criteria
         */
        public Criteria createCriteria(Class persistentClass);

        /**
         * Create a new <tt>Criteria</tt> instance, for the given entity class,
         * or a superclass of an entity class, with the given alias.
         * Entities returned by the query are detached.
         *
         * @param persistentClass a class, which is persistent, or has persistent subclasses
         * @return Criteria
         */
        public Criteria createCriteria(Class persistentClass, String alias);

        /**
         * Create a new <tt>Criteria</tt> instance, for the given entity name.
         * Entities returned by the query are detached.
         *
         * @param entityName
         * @return Criteria
         */
        public Criteria createCriteria(String entityName);

        /**
         * Create a new <tt>Criteria</tt> instance, for the given entity name,
         * with the given alias. Entities returned by the query are detached.
         *
         * @param entityName
         * @return Criteria
         */
        public Criteria createCriteria(String entityName, String alias);

        /**
         * Create a new instance of <tt>SQLQuery</tt> for the given SQL query string.
         * Entities returned by the query are detached.
         *
         * @param queryString a SQL query
         * @return SQLQuery
         * @throws HibernateException
         */
        public SQLQuery createSQLQuery(String queryString) throws HibernateException;

        /**
         * Begin a Hibernate transaction.
         */
        public Transaction beginTransaction();

        /**
         * Get the current Hibernate transaction.
         */
        public Transaction getTransaction();

        /**
         * Returns the current JDBC connection associated with this
         * instance.<br>
         * <br>
         * If the session is using aggressive connection release (as in a
         * CMT environment), it is the application's responsibility to
         * close the connection returned by this call. Otherwise, the
         * application should not close the connection.
         */
        public Connection connection();
}