Source Code Cross Referenced for OC4JJtaTransactionManager.java in  » J2EE » spring-framework-2.0.6 » org » springframework » transaction » jta » 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.transaction.jta 
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.transaction.jta;
018:
019:        import java.lang.reflect.InvocationTargetException;
020:        import java.lang.reflect.Method;
021:
022:        import javax.transaction.NotSupportedException;
023:        import javax.transaction.SystemException;
024:        import javax.transaction.Transaction;
025:        import javax.transaction.UserTransaction;
026:
027:        import org.springframework.transaction.TransactionDefinition;
028:        import org.springframework.transaction.TransactionSystemException;
029:        import org.springframework.util.ClassUtils;
030:
031:        /**
032:         * Special {@link JtaTransactionManager} variant for Oracle OC4J (10.1.3 and higher).
033:         * Supports the full power of Spring's transaction definitions on OC4J's
034:         * transaction coordinator, <i>beyond standard JTA</i>: transaction names
035:         * and per-transaction isolation levels.
036:         *
037:         * <p>Uses OC4J's special <code>begin(name)</code> method to start a JTA transaction,
038:         * in orderto make <b>Spring-driven transactions visible in OC4J's transaction
039:         * monitor</b>. In case of Spring's declarative transactions, the exposed name will
040:         * (by default) be the fully-qualified class name + "." + method name.
041:         *
042:         * <p>Supports a <b>per-transaction isolation level</b> through OC4J's corresponding
043:         * <code>OC4JTransaction.setTransactionIsolation(int)</code> method. This will
044:         * apply the specified isolation level (e.g. ISOLATION_SERIALIZABLE) to all
045:         * JDBC Connections that participate in the given transaction.
046:         *
047:         * <p>Automatically detects the available OC4J server version and adapts accordingly.
048:         * Supports the "com.evermind.server" package in OC4J 10.1.3.2 as well as the
049:         * "oracle.j2ee.transaction" package in later OC4J versions.
050:         *
051:         * <p>By default, the JTA UserTransaction and TransactionManager handles are
052:         * fetched directly from OC4J's <code>TransactionUtility</code> in 10.1.3.2+.
053:         * This can be overridden by specifying "userTransaction"/"userTransactionName"
054:         * and "transactionManager"/"transactionManagerName", passing in existing handles
055:         * or specifying corresponding JNDI locations to look up.
056:         *
057:         * <p>Thanks to Oracle for donating the original version of this extended OC4J
058:         * integration code to the Spring project!
059:         *
060:         * @author Paul Parkinson
061:         * @author Juergen Hoeller
062:         * @since 2.0.3
063:         * @see org.springframework.transaction.TransactionDefinition#getName
064:         * @see org.springframework.transaction.TransactionDefinition#getIsolationLevel
065:         * @see oracle.j2ee.transaction.OC4JTransactionManager#begin(String)
066:         * @see oracle.j2ee.transaction.OC4JTransaction#setTransactionIsolation
067:         * @see oracle.j2ee.transaction.TransactionUtility
068:         */
069:        public class OC4JJtaTransactionManager extends JtaTransactionManager {
070:
071:            private static final String TRANSACTION_UTILITY_CLASS_NAME = "oracle.j2ee.transaction.TransactionUtility";
072:
073:            private static final String TRANSACTION_MANAGER_CLASS_NAME = "oracle.j2ee.transaction.OC4JTransactionManager";
074:
075:            private static final String TRANSACTION_CLASS_NAME = "oracle.j2ee.transaction.OC4JTransaction";
076:
077:            private static final String FALLBACK_TRANSACTION_MANAGER_CLASS_NAME = "com.evermind.server.ApplicationServerTransactionManager";
078:
079:            private static final String FALLBACK_TRANSACTION_CLASS_NAME = "com.evermind.server.ApplicationServerTransaction";
080:
081:            private Method beginWithNameMethod;
082:
083:            private Method setTransactionIsolationMethod;
084:
085:            public void afterPropertiesSet() throws TransactionSystemException {
086:                super .afterPropertiesSet();
087:                loadOC4JTransactionClasses();
088:            }
089:
090:            protected UserTransaction retrieveUserTransaction()
091:                    throws TransactionSystemException {
092:                try {
093:                    Class transactionUtilityClass = getClass().getClassLoader()
094:                            .loadClass(TRANSACTION_UTILITY_CLASS_NAME);
095:                    Method getInstanceMethod = transactionUtilityClass
096:                            .getMethod("getInstance", new Class[0]);
097:                    Object transactionUtility = getInstanceMethod.invoke(null,
098:                            new Object[0]);
099:                    logger
100:                            .debug("Retrieving JTA UserTransaction from OC4J TransactionUtility");
101:                    Method getUserTransactionMethod = transactionUtility
102:                            .getClass().getMethod("getOC4JUserTransaction",
103:                                    new Class[0]);
104:                    return (UserTransaction) getUserTransactionMethod.invoke(
105:                            transactionUtility, new Object[0]);
106:                } catch (ClassNotFoundException ex) {
107:                    logger
108:                            .debug("Could not find OC4J 10.1.3.2 TransactionUtility: "
109:                                    + ex);
110:                    // Return null to make the superclass perform its standard J2EE lookup,
111:                    // which will work on earlier OC4J versions.
112:                    return null;
113:                } catch (InvocationTargetException ex) {
114:                    throw new TransactionSystemException(
115:                            "OC4J's TransactionUtility.getOC4JUserTransaction() method failed",
116:                            ex.getTargetException());
117:                } catch (Exception ex) {
118:                    throw new TransactionSystemException(
119:                            "Could not invoke OC4J's TransactionUtility.getOC4JUserTransaction() method",
120:                            ex);
121:                }
122:            }
123:
124:            private void loadOC4JTransactionClasses()
125:                    throws TransactionSystemException {
126:                // Find available OC4J API (in "oracle.j2ee.transaction" or "com.evermind.server")
127:                Class transactionManagerClass = null;
128:                Class transactionClass = null;
129:                try {
130:                    transactionManagerClass = getClass().getClassLoader()
131:                            .loadClass(TRANSACTION_MANAGER_CLASS_NAME);
132:                    transactionClass = getClass().getClassLoader().loadClass(
133:                            TRANSACTION_CLASS_NAME);
134:                } catch (ClassNotFoundException ex) {
135:                    try {
136:                        transactionManagerClass = getClass()
137:                                .getClassLoader()
138:                                .loadClass(
139:                                        FALLBACK_TRANSACTION_MANAGER_CLASS_NAME);
140:                        transactionClass = getClass().getClassLoader()
141:                                .loadClass(FALLBACK_TRANSACTION_CLASS_NAME);
142:                    } catch (ClassNotFoundException ex2) {
143:                        throw new TransactionSystemException(
144:                                "Could not initialize OC4JJtaTransactionManager because OC4J API classes are not available",
145:                                ex);
146:                    }
147:                }
148:
149:                // Cache reflective Method references for later use.
150:                if (transactionManagerClass.isInstance(getUserTransaction())) {
151:                    this .beginWithNameMethod = ClassUtils.getMethodIfAvailable(
152:                            transactionManagerClass, "begin",
153:                            new Class[] { String.class });
154:                    this .setTransactionIsolationMethod = ClassUtils
155:                            .getMethodIfAvailable(transactionClass,
156:                                    "setTransactionIsolation",
157:                                    new Class[] { int.class });
158:                    logger
159:                            .info("Support for OC4J transaction names and isolation levels available");
160:                } else {
161:                    logger
162:                            .info("Support for OC4J transaction names and isolation levels not available");
163:                }
164:            }
165:
166:            protected void doJtaBegin(JtaTransactionObject txObject,
167:                    TransactionDefinition definition)
168:                    throws NotSupportedException, SystemException {
169:
170:                int timeout = determineTimeout(definition);
171:                applyTimeout(txObject, timeout);
172:
173:                // Apply transaction name, if any, through the extended OC4J transaction begin method.
174:                if (this .beginWithNameMethod != null
175:                        && definition.getName() != null) {
176:                    /*
177:                    oracle.j2ee.transaction.OC4JTransactionManager otm = (oracle.j2ee.transaction.OC4JTransactionManager) ut;
178:                    otm.begin(definition.getName());
179:                     */
180:                    try {
181:                        this .beginWithNameMethod.invoke(txObject
182:                                .getUserTransaction(),
183:                                new Object[] { definition.getName() });
184:                    } catch (InvocationTargetException ex) {
185:                        throw new TransactionSystemException(
186:                                "OC4J's UserTransaction.begin(String) method failed",
187:                                ex.getTargetException());
188:                    } catch (Exception ex) {
189:                        throw new TransactionSystemException(
190:                                "Could not invoke OC4J's UserTransaction.begin(String) method",
191:                                ex);
192:                    }
193:                } else {
194:                    // No OC4J UserTransaction available or no transaction name specified
195:                    // -> standard JTA begin call.
196:                    txObject.getUserTransaction().begin();
197:                }
198:
199:                // Specify isolation level, if any, through the corresponding OC4J transaction method.
200:                if (this .setTransactionIsolationMethod != null) {
201:                    if (definition.getIsolationLevel() != TransactionDefinition.ISOLATION_DEFAULT) {
202:                        try {
203:                            Transaction tx = getTransactionManager()
204:                                    .getTransaction();
205:                            /*
206:                            oracle.j2ee.transaction.OC4JTransaction otx = (oracle.j2ee.transaction.OC4JTransaction) tx;
207:                            otx.setTransactionIsolation(definition.getIsolationLevel());
208:                             */
209:                            Integer isolationLevel = new Integer(definition
210:                                    .getIsolationLevel());
211:                            this .setTransactionIsolationMethod.invoke(tx,
212:                                    new Object[] { isolationLevel });
213:                        } catch (InvocationTargetException ex) {
214:                            throw new TransactionSystemException(
215:                                    "OC4J's Transaction.setTransactionIsolation(int) method failed",
216:                                    ex.getTargetException());
217:                        } catch (Exception ex) {
218:                            throw new TransactionSystemException(
219:                                    "Could not invoke OC4J's Transaction.setTransactionIsolation(int) method",
220:                                    ex);
221:                        }
222:                    }
223:                } else {
224:                    applyIsolationLevel(txObject, definition
225:                            .getIsolationLevel());
226:                }
227:            }
228:
229:        }
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