Source Code Cross Referenced for SessionFactory.java in  » J2EE » spring-framework-2.5 » org » springframework » orm » toplink » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.orm.toplink 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Copyright 2002-2005 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.toplink;
18:
19:        import oracle.toplink.exceptions.TopLinkException;
20:        import oracle.toplink.sessions.Session;
21:
22:        /**
23:         * The SessionFactory interface serves as factory for TopLink Sessions,
24:         * allowing for dependency injection on thread-safe TopLink-based DAOs.
25:         * Used by TopLinkAccessor/Template and TopLinkTransactionManager.
26:         *
27:         * <p>In contrast to JDO or Hibernate (which define native PersistenceManagerFactory
28:         * and SessionFactory interfaces, respectively), TopLink itself does not provide
29:         * such a factory interface: hence, it is necessary to define it within Spring.
30:         * Note that this interface does not depend on any other Spring interfaces or
31:         * classes, to allow for keeping TopLink-based DAOs as independent as possible.
32:         *
33:         * @author Juergen Hoeller
34:         * @since 1.2
35:         * @see TopLinkAccessor#setSessionFactory
36:         * @see TopLinkTransactionManager#setSessionFactory
37:         */
38:        public interface SessionFactory {
39:
40:            /**
41:             * Create a plain TopLink Session for the current application context.
42:             * Will usually be a new ClientSession for the current thread.
43:             * <p>The returned Session will participate in JTA transactions (provided that
44:             * TopLink is configured with a corresponding external transaction controller),
45:             * but not in Spring-managed transactions (by TopLinkTransactionManager).
46:             * <p>This is the factory method to be called by TopLink data access code,
47:             * usually through the <code>SessionFactoryUtils.getSession</code> method
48:             * that checks for a transactional (thread-bound) Session first.
49:             * @return the new TopLink Session
50:             * @throws TopLinkException in case of errors
51:             * @see SessionFactoryUtils#getSession(SessionFactory, boolean)
52:             */
53:            Session createSession() throws TopLinkException;
54:
55:            /**
56:             * Create a new managed TopLink client Session for the current context.
57:             * Will usually be a new special ClientSession for the current thread.
58:             * <p>The returned Session will be prepared to be managed within a Spring
59:             * transaction (by TopLinkTransactionManager). It will carry an active
60:             * UnitOfWork that expects to be committed at transaction completion,
61:             * just like a plain TopLink Session does within a JTA transaction.
62:             * <p>This method is only supposed to be called by Spring's
63:             * TopLinkTransactionManager or similar TopLink-based transaction managers.
64:             * If a SessionFactory does not support managed Sessions, it should throw
65:             * an UnsupportedOperationException.
66:             * @return the new TopLink Session
67:             * @throws TopLinkException in case of errors
68:             * @see oracle.toplink.sessions.Session#getActiveUnitOfWork()
69:             */
70:            Session createManagedClientSession() throws TopLinkException;
71:
72:            /**
73:             * Create a new transaction-aware TopLink Session that exposes the currently
74:             * active Session and UnitOfWork via <code>Session.getActiveSession()</code>
75:             * and <code>Session.getActiveUnitOfWork()</code>, respectively.
76:             * <p>Such a Session reference can be used analogously to a managed TopLink
77:             * Session in a JTA environment, with Spring-managed transactions backing it.
78:             * <p>It is usually preferable to let DAOs work with a full SessionFactory,
79:             * accessing TopLink Sessions via <code>SessionFactoryUtils.getSession</code>.
80:             * However, a transaction-aware TopLink Session reference does not impose any
81:             * Spring dependency, so might be preferable if you'd like to keep your data
82:             * access code tied to TopLink API only.
83:             * @return the new TopLink Session
84:             * @throws TopLinkException in case of errors
85:             * @see oracle.toplink.sessions.Session#getActiveSession()
86:             * @see oracle.toplink.sessions.Session#getActiveUnitOfWork()
87:             */
88:            Session createTransactionAwareSession() throws TopLinkException;
89:
90:            /**
91:             * Close this SessionFactory, shutting down all internal resources.
92:             */
93:            void close();
94:
95:        }
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