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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.orm.jdo 
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.jdo;
018:
019:        import javax.jdo.JDOException;
020:        import javax.jdo.PersistenceManager;
021:
022:        import org.aopalliance.intercept.MethodInterceptor;
023:        import org.aopalliance.intercept.MethodInvocation;
024:
025:        import org.springframework.transaction.support.TransactionSynchronizationManager;
026:
027:        /**
028:         * This interceptor binds a new JDO PersistenceManager 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 PersistenceManager (e.g. from JdoTransactionManager,
031:         * or from a surrounding JDO-intercepted method), the interceptor simply participates in it.
032:         *
033:         * <p>Application code must retrieve a JDO PersistenceManager via the
034:         * <code>PersistenceManagerFactoryUtils.getPersistenceManager</code> method,
035:         * to be able to detect a thread-bound PersistenceManager. It is preferable to use
036:         * <code>getPersistenceManager</code> with allowCreate=false, if the code relies on
037:         * the interceptor to provide proper PersistenceManager handling. Typically, the code
038:         * will look like as follows:
039:         *
040:         * <pre>
041:         * public void doSomeDataAccessAction() {
042:         *   PersistenceManager pm = PersistenceManagerFactoryUtils.getPersistenceManager(this.pmf, false);
043:         *   ...
044:         * }</pre>
045:         *
046:         * <p>Note that this interceptor automatically translates JDOExceptions, via
047:         * delegating to the <code>PersistenceManagerFactoryUtils.convertJdoAccessException</code>
048:         * method that converts them to exceptions that are compatible with the
049:         * <code>org.springframework.dao</code> exception hierarchy (like JdoTemplate 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 JdoTemplate'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 PersistenceManager in the first place, so adding this interceptor
063:         * to the configuration just adds value when fine-tuning PersistenceManager settings
064:         * like the flush mode - or when relying on exception translation.
065:         *
066:         * @author Juergen Hoeller
067:         * @since 13.06.2003
068:         * @see PersistenceManagerFactoryUtils#getPersistenceManager
069:         * @see JdoTransactionManager
070:         * @see JdoTemplate
071:         */
072:        public class JdoInterceptor extends JdoAccessor implements 
073:                MethodInterceptor {
074:
075:            private boolean exceptionConversionEnabled = true;
076:
077:            /**
078:             * Set whether to convert any JDOException 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:                boolean existingTransaction = false;
092:                PersistenceManager pm = PersistenceManagerFactoryUtils
093:                        .getPersistenceManager(getPersistenceManagerFactory(),
094:                                true);
095:                if (TransactionSynchronizationManager
096:                        .hasResource(getPersistenceManagerFactory())) {
097:                    logger
098:                            .debug("Found thread-bound PersistenceManager for JDO interceptor");
099:                    existingTransaction = true;
100:                } else {
101:                    logger
102:                            .debug("Using new PersistenceManager for JDO interceptor");
103:                    TransactionSynchronizationManager.bindResource(
104:                            getPersistenceManagerFactory(),
105:                            new PersistenceManagerHolder(pm));
106:                }
107:                try {
108:                    Object retVal = methodInvocation.proceed();
109:                    flushIfNecessary(pm, existingTransaction);
110:                    return retVal;
111:                } catch (JDOException ex) {
112:                    if (this .exceptionConversionEnabled) {
113:                        throw convertJdoAccessException(ex);
114:                    } else {
115:                        throw ex;
116:                    }
117:                } finally {
118:                    if (existingTransaction) {
119:                        logger
120:                                .debug("Not closing pre-bound JDO PersistenceManager after interceptor");
121:                    } else {
122:                        TransactionSynchronizationManager
123:                                .unbindResource(getPersistenceManagerFactory());
124:                        PersistenceManagerFactoryUtils
125:                                .releasePersistenceManager(pm,
126:                                        getPersistenceManagerFactory());
127:                    }
128:                }
129:            }
130:
131:        }
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