Source Code Cross Referenced for JpaAccessor.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 2002-2007 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:        import javax.persistence.EntityManagerFactory;
021:        import javax.persistence.PersistenceException;
022:
023:        import org.springframework.beans.factory.InitializingBean;
024:        import org.springframework.dao.support.DataAccessUtils;
025:
026:        /**
027:         * Base class for JpaTemplate and JpaInterceptor, defining common
028:         * properties such as EntityManagerFactory and flushing behavior.
029:         *
030:         * <p>Not intended to be used directly.
031:         * See {@link JpaTemplate} and {@link JpaInterceptor}.
032:         *
033:         * @author Juergen Hoeller
034:         * @since 2.0
035:         * @see #setEntityManagerFactory
036:         * @see #setEntityManager
037:         * @see #setJpaDialect
038:         * @see #setFlushEager
039:         * @see JpaTemplate
040:         * @see JpaInterceptor
041:         * @see JpaDialect
042:         */
043:        public abstract class JpaAccessor extends EntityManagerFactoryAccessor
044:                implements  InitializingBean {
045:
046:            private EntityManager entityManager;
047:
048:            private JpaDialect jpaDialect = new DefaultJpaDialect();
049:
050:            private boolean flushEager = false;
051:
052:            /**
053:             * Set the JPA EntityManager to use.
054:             */
055:            public void setEntityManager(EntityManager entityManager) {
056:                this .entityManager = entityManager;
057:            }
058:
059:            /**
060:             * Return the JPA EntityManager to use.
061:             */
062:            public EntityManager getEntityManager() {
063:                return entityManager;
064:            }
065:
066:            /**
067:             * Set the JPA dialect to use for this accessor.
068:             * <p>The dialect object can be used to retrieve the underlying JDBC
069:             * connection, for example.
070:             */
071:            public void setJpaDialect(JpaDialect jpaDialect) {
072:                this .jpaDialect = (jpaDialect != null ? jpaDialect
073:                        : new DefaultJpaDialect());
074:            }
075:
076:            /**
077:             * Return the JPA dialect to use for this accessor.
078:             * <p>Creates a default one for the specified EntityManagerFactory if none set.
079:             */
080:            public JpaDialect getJpaDialect() {
081:                return this .jpaDialect;
082:            }
083:
084:            /**
085:             * Set if this accessor should flush changes to the database eagerly.
086:             * <p>Eager flushing leads to immediate synchronization with the database,
087:             * even if in a transaction. This causes inconsistencies to show up and throw
088:             * a respective exception immediately, and JDBC access code that participates
089:             * in the same transaction will see the changes as the database is already
090:             * aware of them then. But the drawbacks are:
091:             * <ul>
092:             * <li>additional communication roundtrips with the database, instead of a
093:             * single batch at transaction commit;
094:             * <li>the fact that an actual database rollback is needed if the JPA
095:             * transaction rolls back (due to already submitted SQL statements).
096:             * </ul>
097:             */
098:            public void setFlushEager(boolean flushEager) {
099:                this .flushEager = flushEager;
100:            }
101:
102:            /**
103:             * Return if this accessor should flush changes to the database eagerly.
104:             */
105:            public boolean isFlushEager() {
106:                return this .flushEager;
107:            }
108:
109:            /**
110:             * Eagerly initialize the JPA dialect, creating a default one
111:             * for the specified EntityManagerFactory if none set.
112:             */
113:            public void afterPropertiesSet() {
114:                EntityManagerFactory emf = getEntityManagerFactory();
115:                if (emf == null && getEntityManager() == null) {
116:                    throw new IllegalArgumentException(
117:                            "entityManagerFactory or entityManager is required");
118:                }
119:                if (emf instanceof  EntityManagerFactoryInfo) {
120:                    JpaDialect jpaDialect = ((EntityManagerFactoryInfo) emf)
121:                            .getJpaDialect();
122:                    if (jpaDialect != null) {
123:                        setJpaDialect(jpaDialect);
124:                    }
125:                }
126:            }
127:
128:            /**
129:             * Flush the given JPA entity manager if necessary.
130:             * @param em the current JPA PersistenceManage
131:             * @param existingTransaction if executing within an existing transaction
132:             * @throws javax.persistence.PersistenceException in case of JPA flushing errors
133:             */
134:            protected void flushIfNecessary(EntityManager em,
135:                    boolean existingTransaction) throws PersistenceException {
136:                if (isFlushEager()) {
137:                    logger.debug("Eagerly flushing JPA entity manager");
138:                    em.flush();
139:                }
140:            }
141:
142:            /**
143:             * Convert the given runtime exception to an appropriate exception from the
144:             * <code>org.springframework.dao</code> hierarchy if necessary, or
145:             * return the exception itself if it is not persistence related
146:             * <p>Default implementation delegates to the JpaDialect.
147:             * May be overridden in subclasses.
148:             * @param ex runtime exception that occured, which may or may not
149:             * be JPA-related
150:             * @return the corresponding DataAccessException instance if
151:             * wrapping should occur, otherwise the raw exception
152:             * @see org.springframework.dao.support.DataAccessUtils#translateIfNecessary
153:             */
154:            public RuntimeException translateIfNecessary(RuntimeException ex) {
155:                return DataAccessUtils
156:                        .translateIfNecessary(ex, getJpaDialect());
157:            }
158:
159:        }
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