Source Code Cross Referenced for HibernateInterceptor.java in  » J2EE » spring-framework-2.0.6 » org » springframework » orm » hibernate3 » 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.hibernate3 
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.hibernate3;
018:
019:        import org.aopalliance.intercept.MethodInterceptor;
020:        import org.aopalliance.intercept.MethodInvocation;
021:        import org.hibernate.FlushMode;
022:        import org.hibernate.HibernateException;
023:        import org.hibernate.Session;
024:
025:        import org.springframework.transaction.support.TransactionSynchronizationManager;
026:
027:        /**
028:         * This interceptor binds a new Hibernate Session to the thread before a method
029:         * call, closing and removing it afterwards in case of any method outcome.
030:         * If there already is a pre-bound Session (e.g. from HibernateTransactionManager,
031:         * or from a surrounding Hibernate-intercepted method), the interceptor simply
032:         * participates in it.
033:         *
034:         * <p>Application code must retrieve a Hibernate Session via the
035:         * <code>SessionFactoryUtils.getSession</code> method or - preferably -
036:         * Hibernate's own <code>SessionFactory.getCurrentSession()</code> method, to be
037:         * able to detect a thread-bound Session. Typically, the code will look like as follows:
038:         *
039:         * <pre>
040:         * public void doSomeDataAccessAction() {
041:         *   Session session = this.sessionFactory.getCurrentSession();
042:         *   ...
043:         *   // No need to close the Session or translate exceptions!
044:         * }</pre>
045:         *
046:         * Note that this interceptor automatically translates HibernateExceptions,
047:         * via delegating to the <code>SessionFactoryUtils.convertHibernateAccessException</code>
048:         * method that converts them to exceptions that are compatible with the
049:         * <code>org.springframework.dao</code> exception hierarchy (like HibernateTemplate does).
050:         * This can be turned off if the raw exceptions are preferred.
051:         *
052:         * <p>This class can be considered a declarative alternative to HibernateTemplate's
053:         * callback approach. The advantages are:
054:         * <ul>
055:         * <li>no anonymous classes necessary for callback implementations;
056:         * <li>the possibility to throw any application exceptions from within data access code.
057:         * </ul>
058:         *
059:         * <p>The drawback is the dependency on interceptor configuration. However, note
060:         * that this interceptor is usually <i>not</i> necessary in scenarios where the
061:         * data access code always executes within transactions. A transaction will always
062:         * have a thread-bound Session in the first place, so adding this interceptor to the
063:         * configuration just adds value when fine-tuning Session settings like the flush mode
064:         * - or when relying on exception translation.
065:         *
066:         * @author Juergen Hoeller
067:         * @since 1.2
068:         * @see org.hibernate.SessionFactory#getCurrentSession()
069:         * @see HibernateTransactionManager
070:         * @see HibernateTemplate
071:         */
072:        public class HibernateInterceptor extends HibernateAccessor implements 
073:                MethodInterceptor {
074:
075:            private boolean exceptionConversionEnabled = true;
076:
077:            /**
078:             * Set whether to convert any HibernateException raised to a Spring DataAccessException,
079:             * compatible with the <code>org.springframework.dao</code> exception hierarchy.
080:             * <p>Default is "true". Turn this flag off to let the caller receive raw exceptions
081:             * as-is, without any wrapping.
082:             * @see org.springframework.dao.DataAccessException
083:             */
084:            public void setExceptionConversionEnabled(
085:                    boolean exceptionConversionEnabled) {
086:                this .exceptionConversionEnabled = exceptionConversionEnabled;
087:            }
088:
089:            public Object invoke(MethodInvocation methodInvocation)
090:                    throws Throwable {
091:                Session session = getSession();
092:                boolean existingTransaction = SessionFactoryUtils
093:                        .isSessionTransactional(session, getSessionFactory());
094:
095:                if (existingTransaction) {
096:                    logger
097:                            .debug("Found thread-bound Session for HibernateInterceptor");
098:                } else {
099:                    TransactionSynchronizationManager.bindResource(
100:                            getSessionFactory(), new SessionHolder(session));
101:                }
102:
103:                FlushMode previousFlushMode = null;
104:                try {
105:                    previousFlushMode = applyFlushMode(session,
106:                            existingTransaction);
107:                    enableFilters(session);
108:                    Object retVal = methodInvocation.proceed();
109:                    flushIfNecessary(session, existingTransaction);
110:                    return retVal;
111:                } catch (HibernateException ex) {
112:                    if (this .exceptionConversionEnabled) {
113:                        throw convertHibernateAccessException(ex);
114:                    } else {
115:                        throw ex;
116:                    }
117:                } finally {
118:                    if (existingTransaction) {
119:                        logger
120:                                .debug("Not closing pre-bound Hibernate Session after HibernateInterceptor");
121:                        disableFilters(session);
122:                        if (previousFlushMode != null) {
123:                            session.setFlushMode(previousFlushMode);
124:                        }
125:                    } else {
126:                        TransactionSynchronizationManager
127:                                .unbindResource(getSessionFactory());
128:                        SessionFactoryUtils
129:                                .closeSessionOrRegisterDeferredClose(session,
130:                                        getSessionFactory());
131:                    }
132:                }
133:            }
134:
135:            /**
136:             * Return a Session for use by this interceptor.
137:             * @see SessionFactoryUtils#getSession
138:             */
139:            protected Session getSession() {
140:                return SessionFactoryUtils.getSession(getSessionFactory(),
141:                        getEntityInterceptor(), getJdbcExceptionTranslator());
142:            }
143:
144:        }
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