Source Code Cross Referenced for JdoAccessor.java in  » J2EE » spring-framework-2.5 » org » springframework » orm » jdo » 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.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:        import javax.jdo.PersistenceManagerFactory;
022:
023:        import org.apache.commons.logging.Log;
024:        import org.apache.commons.logging.LogFactory;
025:
026:        import org.springframework.beans.factory.InitializingBean;
027:        import org.springframework.dao.DataAccessException;
028:
029:        /**
030:         * Base class for JdoTemplate and JdoInterceptor, defining common
031:         * properties such as PersistenceManagerFactory and flushing behavior.
032:         *
033:         * <p>Note: With JDO, modifications to persistent objects are just possible
034:         * within a transaction (in contrast to Hibernate). Therefore, eager flushing
035:         * will just get applied when in a transaction. Furthermore, there is no
036:         * explicit notion of flushing never, as this would not imply a performance
037:         * gain due to JDO's field interception mechanism (which doesn't involve
038:         * the overhead of snapshot comparisons).
039:         *
040:         * <p>Eager flushing is just available for specific JDO providers.
041:         * You need to a corresponding JdoDialect to make eager flushing work.
042:         *
043:         * <p>Not intended to be used directly. See JdoTemplate and JdoInterceptor.
044:         *
045:         * @author Juergen Hoeller
046:         * @since 02.11.2003
047:         * @see JdoTemplate
048:         * @see JdoInterceptor
049:         * @see #setFlushEager
050:         */
051:        public abstract class JdoAccessor implements  InitializingBean {
052:
053:            /** Logger available to subclasses */
054:            protected final Log logger = LogFactory.getLog(getClass());
055:
056:            private PersistenceManagerFactory persistenceManagerFactory;
057:
058:            private JdoDialect jdoDialect;
059:
060:            private boolean flushEager = false;
061:
062:            /**
063:             * Set the JDO PersistenceManagerFactory that should be used to create
064:             * PersistenceManagers.
065:             */
066:            public void setPersistenceManagerFactory(
067:                    PersistenceManagerFactory pmf) {
068:                this .persistenceManagerFactory = pmf;
069:            }
070:
071:            /**
072:             * Return the JDO PersistenceManagerFactory that should be used to create
073:             * PersistenceManagers.
074:             */
075:            public PersistenceManagerFactory getPersistenceManagerFactory() {
076:                return persistenceManagerFactory;
077:            }
078:
079:            /**
080:             * Set the JDO dialect to use for this accessor.
081:             * <p>The dialect object can be used to retrieve the underlying JDBC
082:             * connection and to eagerly flush changes to the database.
083:             * <p>Default is a DefaultJdoDialect based on the PersistenceManagerFactory's
084:             * underlying DataSource, if any.
085:             */
086:            public void setJdoDialect(JdoDialect jdoDialect) {
087:                this .jdoDialect = jdoDialect;
088:            }
089:
090:            /**
091:             * Return the JDO dialect to use for this accessor.
092:             * <p>Creates a default one for the specified PersistenceManagerFactory if none set.
093:             */
094:            public JdoDialect getJdoDialect() {
095:                if (this .jdoDialect == null) {
096:                    this .jdoDialect = new DefaultJdoDialect();
097:                }
098:                return this .jdoDialect;
099:            }
100:
101:            /**
102:             * Set if this accessor should flush changes to the database eagerly.
103:             * <p>Eager flushing leads to immediate synchronization with the database,
104:             * even if in a transaction. This causes inconsistencies to show up and throw
105:             * a respective exception immediately, and JDBC access code that participates
106:             * in the same transaction will see the changes as the database is already
107:             * aware of them then. But the drawbacks are:
108:             * <ul>
109:             * <li>additional communication roundtrips with the database, instead of a
110:             * single batch at transaction commit;
111:             * <li>the fact that an actual database rollback is needed if the JDO
112:             * transaction rolls back (due to already submitted SQL statements).
113:             * </ul>
114:             */
115:            public void setFlushEager(boolean flushEager) {
116:                this .flushEager = flushEager;
117:            }
118:
119:            /**
120:             * Return if this accessor should flush changes to the database eagerly.
121:             */
122:            public boolean isFlushEager() {
123:                return flushEager;
124:            }
125:
126:            /**
127:             * Eagerly initialize the JDO dialect, creating a default one
128:             * for the specified PersistenceManagerFactory if none set.
129:             */
130:            public void afterPropertiesSet() {
131:                if (getPersistenceManagerFactory() == null) {
132:                    throw new IllegalArgumentException(
133:                            "persistenceManagerFactory is required");
134:                }
135:                // Build default JdoDialect if none explicitly specified.
136:                if (this .jdoDialect == null) {
137:                    this .jdoDialect = new DefaultJdoDialect(
138:                            getPersistenceManagerFactory()
139:                                    .getConnectionFactory());
140:                }
141:            }
142:
143:            /**
144:             * Flush the given JDO persistence manager if necessary.
145:             * @param pm the current JDO PersistenceManager
146:             * @param existingTransaction if executing within an existing transaction
147:             * (within an existing JDO PersistenceManager that won't be closed immediately)
148:             * @throws JDOException in case of JDO flushing errors
149:             */
150:            protected void flushIfNecessary(PersistenceManager pm,
151:                    boolean existingTransaction) throws JDOException {
152:                if (isFlushEager()) {
153:                    logger.debug("Eagerly flushing JDO persistence manager");
154:                    getJdoDialect().flush(pm);
155:                }
156:            }
157:
158:            /**
159:             * Convert the given JDOException to an appropriate exception from the
160:             * <code>org.springframework.dao</code> hierarchy.
161:             * <p>Default implementation delegates to the JdoDialect.
162:             * May be overridden in subclasses.
163:             * @param ex JDOException that occured
164:             * @return the corresponding DataAccessException instance
165:             * @see JdoDialect#translateException
166:             */
167:            public DataAccessException convertJdoAccessException(JDOException ex) {
168:                return getJdoDialect().translateException(ex);
169:            }
170:
171:        }
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