001// Copyright 2007, 2008 The Apache Software Foundation 002// 003// Licensed under the Apache License, Version 2.0 (the "License"); 004// you may not use this file except in compliance with the License. 005// You may obtain a copy of the License at 006// 007// http://www.apache.org/licenses/LICENSE-2.0 008// 009// Unless required by applicable law or agreed to in writing, software 010// distributed under the License is distributed on an "AS IS" BASIS, 011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012// See the License for the specific language governing permissions and 013// limitations under the License. 014 015package org.apache.tapestry5.hibernate; 016 017import org.hibernate.Session; 018 019/** 020 * Manages the Hibernate session for the current thread. This includes creating the session as needed, allowing the 021 * session to checkpoint (commit the current transaction and continue) and commit the transaction automatically at the 022 * end of the request. 023 * <p/> 024 * Remember that in Tapestry, action requests and render requests are entirely separate, and you will see a separate 025 * request and a separate transaction for each. Care should be taken to ensure that entity objects that are retained (in 026 * the session, as persistent field values) between requests are handled correctly (they tend to become detached 027 * instances). 028 * <p/> 029 * This implementation of this service is per-thread. 030 */ 031public interface HibernateSessionManager 032{ 033 /** 034 * Gets the active session for this request, creating it as necessary. When the session is first created, a 035 * transaction is started. 036 * 037 * @return the request's session 038 * @see HibernateSessionSource 039 */ 040 Session getSession(); 041 042 /** 043 * Commits the current transaction (which will cause a flush of data to the database), then starts a new transaction 044 * to replace it. 045 */ 046 void commit(); 047 048 /** 049 * Aborts the current transaction, and starts a new transaction to replace it. 050 */ 051 void abort(); 052}