Source Code Cross Referenced for HibernateCallback.java in  » J2EE » spring-framework-2.0.6 » org » springframework » orm » hibernate » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.orm.hibernate 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Copyright 2002-2006 the original author or authors.
03:         *
04:         * Licensed under the Apache License, Version 2.0 (the "License");
05:         * you may not use this file except in compliance with the License.
06:         * You may obtain a copy of the License at
07:         *
08:         *      http://www.apache.org/licenses/LICENSE-2.0
09:         *
10:         * Unless required by applicable law or agreed to in writing, software
11:         * distributed under the License is distributed on an "AS IS" BASIS,
12:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13:         * See the License for the specific language governing permissions and
14:         * limitations under the License.
15:         */
16:
17:        package org.springframework.orm.hibernate;
18:
19:        import java.sql.SQLException;
20:
21:        import net.sf.hibernate.HibernateException;
22:        import net.sf.hibernate.Session;
23:
24:        /**
25:         * Callback interface for Hibernate code. To be used with {@link HibernateTemplate}'s
26:         * execution methods, often as anonymous classes within a method implementation.
27:         * The typical implementation will call <code>Session.load/find/update</code> to perform
28:         * some operations on persistent objects. It can also perform direct JDBC operations
29:         * via Hibernate's <code>Session.connection()</code>, operating on a JDBC Connection.
30:         *
31:         * <p>Note that Hibernate works on unmodified plain Java objects, performing dirty
32:         * detection via copies made at load time. Returned objects can thus be used outside
33:         * of an active Hibernate Session without any hassle, e.g. for display in a web GUI.
34:         * Reassociating such instances with a new Session, e.g. for updates when coming
35:         * back from the GUI, is straightforward, as the instance has kept its identity.
36:         * You should care to reassociate them as early as possible though, to avoid having
37:         * already loaded a version from the database in the same Session.
38:         *
39:         * @author Juergen Hoeller
40:         * @since 02.05.2003
41:         * @see HibernateTemplate
42:         * @see HibernateTransactionManager
43:         */
44:        public interface HibernateCallback {
45:
46:            /**
47:             * Gets called by <code>HibernateTemplate.execute</code> with an active
48:             * Hibernate <code>Session</code>. Does not need to care about activating
49:             * or closing the <code>Session</code>, or handling transactions.
50:             *
51:             * <p>If called without a thread-bound Hibernate transaction (initiated
52:             * by HibernateTransactionManager), the code will simply get executed on the
53:             * underlying JDBC connection with its transactional semantics. If Hibernate
54:             * is configured to use a JTA-aware DataSource, the JDBC connection and thus
55:             * the callback code will be transactional if a JTA transaction is active.
56:             *
57:             * <p>Allows for returning a result object created within the callback,
58:             * i.e. a domain object or a collection of domain objects.
59:             * A thrown custom RuntimeException is treated as an application exception:
60:             * It gets propagated to the caller of the template.
61:             *
62:             * @param session active Hibernate session
63:             * @return a result object, or <code>null</code> if none
64:             * @throws HibernateException if thrown by the Hibernate API
65:             * @throws SQLException if thrown by Hibernate-exposed JDBC API
66:             * @see HibernateTemplate#execute
67:             * @see HibernateTemplate#executeFind
68:             */
69:            Object doInHibernate(Session session) throws HibernateException,
70:                    SQLException;
71:
72:        }
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