/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2011, Red Hat Inc. 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 Inc.
 *
 * 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;

/**
 * Contract methods shared between {@link Session} and {@link StatelessSession}
 * 
 * @author Steve Ebersole
 */
public interface SharedSessionContract extends Serializable {
	/**
	 * Obtain the tenant identifier associated with this session.
	 *
	 * @return The tenant identifier associated with this session, or {@code null}
	 */
	public String getTenantIdentifier();

	/**
	 * Begin a unit of work and return the associated {@link Transaction} object.  If a new underlying transaction is
	 * required, begin the transaction.  Otherwise continue the new work in the context of the existing underlying
	 * transaction.
	 *
	 * @return a Transaction instance
	 *
	 * @see #getTransaction
	 */
	public Transaction beginTransaction();

	/**
	 * Get the {@link Transaction} instance associated with this session.  The concrete type of the returned
	 * {@link Transaction} object is determined by the {@code hibernate.transaction_factory} property.
	 *
	 * @return a Transaction instance
	 */
	public Transaction getTransaction();

	/**
	 * Create a {@link Query} instance for the named query string defined in the metadata.
	 *
	 * @param queryName the name of a query defined externally
	 *
	 * @return The query instance for manipulation and execution
	 */
	public Query getNamedQuery(String queryName);

	/**
	 * Create a {@link Query} instance for the given HQL query string.
	 *
	 * @param queryString The HQL query
	 *
	 * @return The query instance for manipulation and execution
	 */
	public Query createQuery(String queryString);

	/**
	 * Create a {@link SQLQuery} instance for the given SQL query string.
	 *
	 * @param queryString The SQL query
	 * 
	 * @return The query instance for manipulation and execution
	 */
	public SQLQuery createSQLQuery(String queryString);

	/**
	 * Create {@link Criteria} instance for the given class (entity or subclasses/implementors)
	 *
	 * @param persistentClass The class, which is an entity, or has entity subclasses/implementors
	 *
	 * @return The criteria instance for manipulation and execution
	 */
	public Criteria createCriteria(Class persistentClass);

	/**
	 * Create {@link Criteria} instance for the given class (entity or subclasses/implementors), using a specific
	 * alias.
	 *
	 * @param persistentClass The class, which is an entity, or has entity subclasses/implementors
	 * @param alias The alias to use
	 *
	 * @return The criteria instance for manipulation and execution
	 */
	public Criteria createCriteria(Class persistentClass, String alias);

	/**
	 * Create {@link Criteria} instance for the given entity name.
	 *
	 * @param entityName The entity name

	 * @return The criteria instance for manipulation and execution
	 */
	public Criteria createCriteria(String entityName);

	/**
	 * Create {@link Criteria} instance for the given entity name, using a specific alias.
	 *
	 * @param entityName The entity name
	 * @param alias The alias to use
	 *
	 * @return The criteria instance for manipulation and execution
	 */
	public Criteria createCriteria(String entityName, String alias);
}