Source Code Cross Referenced for JpaInterceptor.java in  » J2EE » spring-framework-2.5 » 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 2.5 » org.springframework.orm.jpa 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2006 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.orm.jpa;
018:
019:        import javax.persistence.EntityManager;
020:
021:        import org.aopalliance.intercept.MethodInterceptor;
022:        import org.aopalliance.intercept.MethodInvocation;
023:
024:        import org.springframework.transaction.support.TransactionSynchronizationManager;
025:
026:        /**
027:         * This interceptor binds a new JPA EntityManager to the thread before a method
028:         * call, closing and removing it afterwards in case of any method outcome.
029:         * If there already is a pre-bound EntityManager (e.g. from JpaTransactionManager,
030:         * or from a surrounding JPA-intercepted method), the interceptor simply participates in it.
031:         *
032:         * <p>Application code must retrieve a JPA EntityManager via the
033:         * <code>EntityManagerFactoryUtils.getEntityManager</code> method or - preferably -
034:         * via a shared <code>EntityManager</code> reference, to be able to detect a
035:         * thread-bound EntityManager. Typically, the code will look like as follows:
036:         *
037:         * <pre>
038:         * public void doSomeDataAccessAction() {
039:         *   this.entityManager...
040:         * }</pre>
041:         *
042:         * <p>Note that this interceptor automatically translates PersistenceExceptions,
043:         * via delegating to the <code>EntityManagerFactoryUtils.convertJpaAccessException</code>
044:         * method that converts them to exceptions that are compatible with the
045:         * <code>org.springframework.dao</code> exception hierarchy (like JpaTemplate does).
046:         *
047:         * <p>This class can be considered a declarative alternative to JpaTemplate's
048:         * callback approach. The advantages are:
049:         * <ul>
050:         * <li>no anonymous classes necessary for callback implementations;
051:         * <li>the possibility to throw any application exceptions from within data access code.
052:         * </ul>
053:         *
054:         * <p>The drawback is the dependency on interceptor configuration. However, note
055:         * that this interceptor is usually <i>not</i> necessary in scenarios where the
056:         * data access code always executes within transactions. A transaction will always
057:         * have a thread-bound EntityManager in the first place, so adding this interceptor
058:         * to the configuration just adds value when fine-tuning EntityManager settings
059:         * like the flush mode - or when relying on exception translation.
060:         *
061:         * @author Juergen Hoeller
062:         * @since 2.0
063:         * @see JpaTransactionManager
064:         * @see JpaTemplate
065:         */
066:        public class JpaInterceptor extends JpaAccessor implements 
067:                MethodInterceptor {
068:
069:            private boolean exceptionConversionEnabled = true;
070:
071:            /**
072:             * Set whether to convert any PersistenceException raised to a Spring DataAccessException,
073:             * compatible with the <code>org.springframework.dao</code> exception hierarchy.
074:             * <p>Default is "true". Turn this flag off to let the caller receive raw exceptions
075:             * as-is, without any wrapping.
076:             * @see org.springframework.dao.DataAccessException
077:             */
078:            public void setExceptionConversionEnabled(
079:                    boolean exceptionConversionEnabled) {
080:                this .exceptionConversionEnabled = exceptionConversionEnabled;
081:            }
082:
083:            public Object invoke(MethodInvocation methodInvocation)
084:                    throws Throwable {
085:                // Determine current EntityManager: either the transactional one
086:                // managed by the factory or a temporary one for the given invocation.
087:                EntityManager em = getTransactionalEntityManager();
088:                boolean isNewEm = false;
089:                if (em == null) {
090:                    logger
091:                            .debug("Creating new EntityManager for JpaInterceptor invocation");
092:                    em = createEntityManager();
093:                    isNewEm = true;
094:                    TransactionSynchronizationManager.bindResource(
095:                            getEntityManagerFactory(), new EntityManagerHolder(
096:                                    em));
097:                }
098:
099:                try {
100:                    Object retVal = methodInvocation.proceed();
101:                    flushIfNecessary(em, !isNewEm);
102:                    return retVal;
103:                } catch (RuntimeException rawException) {
104:                    if (this .exceptionConversionEnabled) {
105:                        // Translation enabled. Translate if we understand the exception.
106:                        throw translateIfNecessary(rawException);
107:                    } else {
108:                        // Translation not enabled. Don't try to translate.
109:                        throw rawException;
110:                    }
111:                } finally {
112:                    if (isNewEm) {
113:                        TransactionSynchronizationManager
114:                                .unbindResource(getEntityManagerFactory());
115:                        logger
116:                                .debug("Closing new EntityManager after JpaInterceptor invocation");
117:                        em.close();
118:                    }
119:                }
120:            }
121:
122:        }
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