Source Code Cross Referenced for JpaCallback.java in  » J2EE » spring-framework-2.0.6 » org » springframework » orm » jpa » 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.jpa 
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.jpa;
18:
19:        import javax.persistence.EntityManager;
20:        import javax.persistence.PersistenceException;
21:
22:        /**
23:         * Callback interface for JPA code. To be used with {@link JpaTemplate}'s
24:         * execution method, often as anonymous classes within a method implementation.
25:         * A typical implementation will call <code>EntityManager.find/merge</code>
26:         * to perform some operations on persistent objects.
27:         *
28:         * @author Juergen Hoeller
29:         * @since 2.0
30:         * @see org.springframework.orm.jpa.JpaTemplate
31:         * @see org.springframework.orm.jpa.JpaTransactionManager
32:         */
33:        public interface JpaCallback {
34:
35:            /**
36:             * Gets called by <code>JpaTemplate.execute</code> with an active
37:             * JPA <code>EntityManager</code>. Does not need to care about activating
38:             * or closing the <code>EntityManager</code>, or handling transactions.
39:             *
40:             * <p>Note that JPA callback code will not flush any modifications to the
41:             * database if not executed within a transaction. Thus, you need to make
42:             * sure that JpaTransactionManager has initiated a JPA transaction when
43:             * the callback gets called, at least if you want to write to the database.
44:             *
45:             * <p>Allows for returning a result object created within the callback,
46:             * i.e. a domain object or a collection of domain objects.
47:             * A thrown custom RuntimeException is treated as an application exception:
48:             * It gets propagated to the caller of the template.
49:             *
50:             * @param em active EntityManager
51:             * @return a result object, or <code>null</code> if none
52:             * @throws PersistenceException if thrown by the JPA API
53:             * @see org.springframework.orm.jpa.JpaTemplate#execute
54:             * @see org.springframework.orm.jpa.JpaTemplate#executeFind
55:             */
56:            Object doInJpa(EntityManager em) throws PersistenceException;
57:
58:        }
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