Source Code Cross Referenced for AbstractSessionFactory.java in  » J2EE » spring-framework-2.5 » org » springframework » orm » toplink » 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.toplink 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2005 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.toplink;
018:
019:        import java.lang.reflect.InvocationHandler;
020:        import java.lang.reflect.InvocationTargetException;
021:        import java.lang.reflect.Method;
022:        import java.lang.reflect.Proxy;
023:
024:        import oracle.toplink.exceptions.TopLinkException;
025:        import oracle.toplink.sessions.Session;
026:        import oracle.toplink.sessions.UnitOfWork;
027:        import org.apache.commons.logging.Log;
028:        import org.apache.commons.logging.LogFactory;
029:
030:        /**
031:         * Abstract SessionFactory implementation that creates proxies for
032:         * "managed" client Sessions and transaction-aware Session references.
033:         *
034:         * <p>Delegates to two template methods:
035:         *
036:         * @author Juergen Hoeller
037:         * @since 1.2.6
038:         * @see #getMasterSession()
039:         * @see #createClientSession()
040:         */
041:        public abstract class AbstractSessionFactory implements  SessionFactory {
042:
043:            /** Logger available to subclasses */
044:            protected final Log logger = LogFactory.getLog(getClass());
045:
046:            /**
047:             * Create a plain client Session for this factory's master Session.
048:             * @see #createClientSession()
049:             */
050:            public Session createSession() throws TopLinkException {
051:                logger.debug("Creating TopLink client Session");
052:                return createClientSession();
053:            }
054:
055:            /**
056:             * Create a "managed" client Session reference for an underlying
057:             * client Session created for this factory.
058:             * @see #createClientSession()
059:             */
060:            public Session createManagedClientSession() throws TopLinkException {
061:                logger.debug("Creating managed TopLink client Session");
062:                return (Session) Proxy.newProxyInstance(getClass()
063:                        .getClassLoader(), new Class[] { Session.class },
064:                        new ManagedClientInvocationHandler(
065:                                createClientSession()));
066:            }
067:
068:            /**
069:             * Create a transaction-aware Session reference for this factory's master Session,
070:             * expecting transactions to be registered for this SessionFactory.
071:             * @see #getMasterSession()
072:             * @see oracle.toplink.sessions.Session#getActiveSession()
073:             * @see oracle.toplink.sessions.Session#getActiveUnitOfWork()
074:             */
075:            public Session createTransactionAwareSession()
076:                    throws TopLinkException {
077:                logger.debug("Creating transaction-aware TopLink Session");
078:                return createTransactionAwareSession(this );
079:            }
080:
081:            /**
082:             * Create a transaction-aware Session reference for this factory's master Session,
083:             * expecting transactions to be registered for the given SessionFactory.
084:             * <p>This method is public to allow custom SessionFactory facades to access
085:             * it directly, if necessary.
086:             * @param sessionFactory the SessionFactory that transactions
087:             * are expected to be registered for
088:             * @see #getMasterSession()
089:             * @see oracle.toplink.sessions.Session#getActiveSession()
090:             * @see oracle.toplink.sessions.Session#getActiveUnitOfWork()
091:             */
092:            public Session createTransactionAwareSession(
093:                    SessionFactory sessionFactory) throws TopLinkException {
094:                return (Session) Proxy.newProxyInstance(getClass()
095:                        .getClassLoader(), new Class[] { Session.class },
096:                        new TransactionAwareInvocationHandler(sessionFactory,
097:                                getMasterSession()));
098:            }
099:
100:            /**
101:             * Return this factory's "master" Session.
102:             * For example, a TopLink ServerSession.
103:             * <p>Used for creating transaction-aware Session reference.
104:             */
105:            protected abstract Session getMasterSession();
106:
107:            /**
108:             * Create a new client Session for this factory's master Session.
109:             * For example, a TopLink ClientSession.
110:             * <p>Used for creating plain Sessions and "managed" client Sessions.
111:             * @throws TopLinkException if creation of a client Session failed
112:             */
113:            protected abstract Session createClientSession()
114:                    throws TopLinkException;
115:
116:            /**
117:             * Invocation handler that decorates a client Session with an "active"
118:             * UnitOfWork. For use in situations where Spring's TopLinkTransactionManager
119:             * requires a "managed" thread-safe TopLink Session.
120:             */
121:            private static class ManagedClientInvocationHandler implements 
122:                    InvocationHandler {
123:
124:                private final Session target;
125:
126:                private final UnitOfWork uow;
127:
128:                public ManagedClientInvocationHandler(Session target) {
129:                    this .target = target;
130:                    this .uow = this .target.acquireUnitOfWork();
131:                }
132:
133:                public Object invoke(Object proxy, Method method, Object[] args)
134:                        throws Throwable {
135:                    if (method.getName().equals("getActiveSession")) {
136:                        return this .target;
137:                    } else if (method.getName().equals("getActiveUnitOfWork")) {
138:                        return this .uow;
139:                    } else if (method.getName().equals("release")) {
140:                        this .uow.release();
141:                        this .target.release();
142:                    } else if (method.getName().equals("equals")) {
143:                        // Only consider equal when proxies are identical.
144:                        return (proxy == args[0] ? Boolean.TRUE : Boolean.FALSE);
145:                    } else if (method.getName().equals("hashCode")) {
146:                        // Use hashCode of SessionFactory proxy.
147:                        return new Integer(hashCode());
148:                    }
149:
150:                    // Invoke method on target Session.
151:                    try {
152:                        return method.invoke(this .target, args);
153:                    } catch (InvocationTargetException ex) {
154:                        throw ex.getTargetException();
155:                    }
156:                }
157:            }
158:
159:            /**
160:             * Invocation handler that delegates <code>getActiveSession</code> calls
161:             * to SessionFactoryUtils, for being aware of thread-bound transactions.
162:             */
163:            private static class TransactionAwareInvocationHandler implements 
164:                    InvocationHandler {
165:
166:                private final SessionFactory sessionFactory;
167:
168:                private final Session target;
169:
170:                public TransactionAwareInvocationHandler(
171:                        SessionFactory sessionFactory, Session target) {
172:                    this .sessionFactory = sessionFactory;
173:                    this .target = target;
174:                }
175:
176:                public Object invoke(Object proxy, Method method, Object[] args)
177:                        throws Throwable {
178:                    // Invocation on Session interface coming in...
179:
180:                    if (method.getName().equals("getActiveSession")) {
181:                        // Handle getActiveSession method: return transactional Session, if any.
182:                        try {
183:                            return SessionFactoryUtils.doGetSession(
184:                                    this .sessionFactory, false);
185:                        } catch (IllegalStateException ex) {
186:                            // getActiveSession is supposed to return the Session itself if no active one found.
187:                            return this .target;
188:                        }
189:                    } else if (method.getName().equals("getActiveUnitOfWork")) {
190:                        // Handle getActiveUnitOfWork method: return transactional UnitOfWork, if any.
191:                        try {
192:                            return SessionFactoryUtils.doGetSession(
193:                                    this .sessionFactory, false)
194:                                    .getActiveUnitOfWork();
195:                        } catch (IllegalStateException ex) {
196:                            // getActiveUnitOfWork is supposed to return null if no active one found.
197:                            return null;
198:                        }
199:                    } else if (method.getName().equals("equals")) {
200:                        // Only consider equal when proxies are identical.
201:                        return (proxy == args[0] ? Boolean.TRUE : Boolean.FALSE);
202:                    } else if (method.getName().equals("hashCode")) {
203:                        // Use hashCode of SessionFactory proxy.
204:                        return new Integer(hashCode());
205:                    }
206:
207:                    // Invoke method on target Session.
208:                    try {
209:                        return method.invoke(this .target, args);
210:                    } catch (InvocationTargetException ex) {
211:                        throw ex.getTargetException();
212:                    }
213:                }
214:            }
215:
216:        }
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