Source Code Cross Referenced for PersistentSessionDO.java in  » J2EE » Enhydra-Application-Framework » com » lutris » appserver » server » sessionEnhydra » persistent » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » Enhydra Application Framework » com.lutris.appserver.server.sessionEnhydra.persistent 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Enhydra Java Application Server Project
003:         * 
004:         * The contents of this file are subject to the Enhydra Public License
005:         * Version 1.1 (the "License"); you may not use this file except in
006:         * compliance with the License. You may obtain a copy of the License on
007:         * the Enhydra web site ( http://www.enhydra.org/ ).
008:         * 
009:         * Software distributed under the License is distributed on an "AS IS"
010:         * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See 
011:         * the License for the specific terms governing rights and limitations
012:         * under the License.
013:         * 
014:         * The Initial Developer of the Enhydra Application Server is Lutris
015:         * Technologies, Inc. The Enhydra Application Server and portions created
016:         * by Lutris Technologies, Inc. are Copyright Lutris Technologies, Inc.
017:         * All Rights Reserved.
018:         * 
019:         * Contributor(s):
020:         * 
021:         * $Id: PersistentSessionDO.java,v 1.2 2006-06-15 13:44:07 sinisa Exp $
022:         */
023:
024:        package com.lutris.appserver.server.sessionEnhydra.persistent;
025:
026:        import java.io.ByteArrayInputStream;
027:        import java.io.ByteArrayOutputStream;
028:        import java.io.IOException;
029:        import java.io.InputStream;
030:        import java.io.ObjectInputStream;
031:        import java.io.ObjectOutputStream;
032:        import java.io.ObjectStreamClass;
033:        import java.io.StreamCorruptedException;
034:        import java.math.BigDecimal;
035:        import java.sql.PreparedStatement;
036:        import java.sql.ResultSet;
037:        import java.sql.SQLException;
038:        import java.sql.Types;
039:
040:        import com.lutris.appserver.server.sql.DBConnection;
041:        import com.lutris.appserver.server.sql.Transaction;
042:        import com.lutris.appserver.server.user.User;
043:
044:        /**
045:         * Database interface for persistent session.
046:         *
047:         * @version $Revision: 1.2 $
048:         * @author  Kyle Clark
049:         */
050:        public class PersistentSessionDO implements  Transaction {
051:
052:            /**
053:             * The session represented by this object.
054:             */
055:            private PersistentSession session;
056:
057:            /**
058:             * Holds the transaction status.
059:             */
060:            private boolean success = false;
061:
062:            /**
063:             * Holds the transaction row count.
064:             */
065:            private int rowCount = 0;
066:
067:            /**
068:             * @param session the session for which this data object
069:             *   will provide a database interface.
070:             */
071:            protected PersistentSessionDO(PersistentSession session) {
072:                this .session = session;
073:            }
074:
075:            /**
076:             * @param rs
077:             *   Result set from which to instantiate the session.
078:             * @param loader
079:             *   The class loader to use when reconstructing the session
080:             *   from serialized data.
081:             * @exception SQLException
082:             *   If a database connection error occurs.
083:             * @exception IOException
084:             *   If the serialized session cannot be re-instantiated from the
085:             *   persistent data.
086:             * @exception ClassNotFoundException
087:             *   If a class associated with the serialized session cannot
088:             *   be found.
089:             */
090:            public PersistentSessionDO(ResultSet rs, ClassLoader loader)
091:                    throws SQLException, IOException, ClassNotFoundException {
092:                InputStream in = rs.getBinaryStream("data");
093:                LoaderObjectInputStream objIn = new LoaderObjectInputStream(in,
094:                        loader);
095:                session = (PersistentSession) objIn.readObject();
096:                objIn.close();
097:            }
098:
099:            /**
100:             * Inserts the session into the database.
101:             *
102:             * @param conn Database connection.
103:             * @exception java.sql.SQLException If a database access error
104:             *  occurs or if the session data could not be serialized.
105:             */
106:            public void executeInsert(DBConnection conn) throws SQLException {
107:                if (session == null) {
108:                    return;
109:                }
110:                String sql = "insert into " + PersistentSessionHome.dbTableName
111:                        + " values (?, ?, ?, ?, ?, ?, ?, ?, ?)";
112:                PreparedStatement stmt = conn.prepareStatement(sql);
113:                int param = 1;
114:                stmt.setString(param++, session.getSessionKey());
115:                if (session.isNew()) {
116:                    stmt.setString(param++, "1");
117:                } else {
118:                    stmt.setString(param++, "0");
119:                }
120:                stmt.setBigDecimal(param++, new BigDecimal((double) session
121:                        .getTimeCreated()));
122:                stmt.setBigDecimal(param++, new BigDecimal((double) session
123:                        .getTimeLastUsed()));
124:                stmt.setBigDecimal(param++, new BigDecimal((double) session
125:                        .getTimeExpires()));
126:                stmt.setBigDecimal(param++, new BigDecimal((double) session
127:                        .getMaxIdleTime()));
128:                stmt.setBigDecimal(param++, new BigDecimal((double) session
129:                        .getMaxNoUserIdleTime()));
130:                User user = session.getUser();
131:                if (user != null) {
132:                    stmt.setString(param++, user.getName());
133:                } else {
134:                    stmt.setNull(param++, Types.VARCHAR);
135:                }
136:                try {
137:                    InputStream in = getBinaryInputStream();
138:                    stmt.setBinaryStream(param++, in, in.available());
139:                    rowCount = conn.executeUpdate(stmt, sql);
140:                    in.close();
141:                } catch (IOException e) {
142:                    throw new SQLException(e.getMessage());
143:                }
144:            }
145:
146:            /**
147:             * If this object's <code>executeInsert</code> method was
148:             * called then <code>finalizeInsert</code> is called with
149:             * the status of the database transaction.  This method
150:             * allows the data object to perform any post processing
151:             * if the transaction succeeded or failed.
152:             *
153:             * @param success true if the transaction succeeded
154:             *   and this object was successfully inserted into the database.
155:             */
156:            public void finalizeInsert(boolean success) {
157:                this .success = success;
158:                if (!success) {
159:                    this .rowCount = 0;
160:                }
161:            }
162:
163:            /**
164:             * Method to update contents of object in database.
165:             *
166:             * @param conn Database connection.
167:             * @exception java.sql.SQLException If a database access error
168:             *  occurs.
169:             */
170:            public void executeUpdate(DBConnection conn) throws SQLException {
171:                String sql = "update "
172:                        + PersistentSessionHome.dbTableName
173:                        + " set isNew = ?, timeCreated = ?, timeLastUsed = ?, "
174:                        + " timeExpires = ?, maxIdleTime = ?, maxNoUserIdleTime = ?, "
175:                        + " userName = ?, data = ? where sessionKey = ?";
176:                PreparedStatement stmt = conn.prepareStatement(sql);
177:                int param = 1;
178:                if (session.isNew()) {
179:                    stmt.setString(param++, "1");
180:                } else {
181:                    stmt.setString(param++, "0");
182:                }
183:                stmt.setBigDecimal(param++, new BigDecimal((double) session
184:                        .getTimeCreated()));
185:                stmt.setBigDecimal(param++, new BigDecimal((double) session
186:                        .getTimeLastUsed()));
187:                stmt.setBigDecimal(param++, new BigDecimal((double) session
188:                        .getTimeExpires()));
189:                stmt.setBigDecimal(param++, new BigDecimal((double) session
190:                        .getMaxIdleTime()));
191:                stmt.setBigDecimal(param++, new BigDecimal((double) session
192:                        .getMaxNoUserIdleTime()));
193:                User user = session.getUser();
194:                if (user != null) {
195:                    stmt.setString(param++, user.getName());
196:                } else {
197:                    stmt.setNull(param++, Types.VARCHAR);
198:                }
199:                try {
200:                    InputStream in = getBinaryInputStream();
201:                    stmt.setBinaryStream(param++, in, in.available());
202:                    stmt.setString(param++, session.getSessionKey());
203:                    rowCount = conn.executeUpdate(stmt, sql);
204:                    in.close();
205:                } catch (IOException e) {
206:                    throw new SQLException(e.getMessage());
207:                }
208:            }
209:
210:            /**
211:             * If this object's <code>executeUpdate</code> method was
212:             * called then <code>finalizeUpdate</code> is called with
213:             * the status of the database transaction.
214:             * For instance the data object may want to
215:             * increment its version number once it has successfully
216:             * been commited to the database.  
217:             *
218:             * @param success true if the transaction succeeded
219:             *   and this object was successfully updated in the database.
220:             */
221:            public void finalizeUpdate(boolean success) {
222:                this .success = success;
223:                if (!success) {
224:                    this .rowCount = 0;
225:                }
226:            }
227:
228:            /**
229:             * Method to delete an object from the database.
230:             *
231:             * @param conn Database connection.
232:             * @exception java.sql.SQLException If a database access error
233:             *  occurs.
234:             */
235:            public void executeDelete(DBConnection conn) throws SQLException {
236:                String sql = "delete from " + PersistentSessionHome.dbTableName
237:                        + " where sessionKey = ?";
238:                PreparedStatement stmt = conn.prepareStatement(sql);
239:                stmt.setString(1, session.getSessionKey());
240:                rowCount = conn.executeUpdate(stmt, sql);
241:            }
242:
243:            /**
244:             * If this object's <code>executeDelete</code> method was
245:             * called then <code>finalizeDelete</code> is called with
246:             * the status of the database transaction.
247:             *
248:             * @param success true if the transaction succeeded
249:             *   and this object was successfully deleted from the
250:             *   database.
251:             */
252:            public void finalizeDelete(boolean success) {
253:                this .success = success;
254:                if (!success) {
255:                    this .rowCount = 0;
256:                }
257:            }
258:
259:            /**
260:             * Returns an input stream containing the serialized
261:             * session data.
262:             *
263:             * @return the input stream.
264:             */
265:            private InputStream getBinaryInputStream() throws IOException {
266:                ByteArrayOutputStream out = new ByteArrayOutputStream();
267:                ObjectOutputStream objOut = new ObjectOutputStream(out);
268:                objOut.writeObject(session);
269:                objOut.flush();
270:                ByteArrayInputStream in = new ByteArrayInputStream(out
271:                        .toByteArray());
272:                objOut.close();
273:                return in;
274:            }
275:
276:            /**
277:             * Returns the session for which this data object is
278:             * acting as a data base interface.
279:             *
280:             * @return the session
281:             */
282:            PersistentSession getSession() {
283:                return session;
284:            }
285:
286:            /**
287:             * Returns the transaction status.
288:             *
289:             * @return the transaction status.
290:             */
291:            boolean getTransactionStatus() {
292:                return success;
293:            }
294:
295:            /**
296:             * Returns the transaction count - i.e. the number
297:             * of rows affected in the transaction.
298:             */
299:            int getTransactionRowCount() {
300:                return rowCount;
301:            }
302:        }
303:
304:        // Internal class that can load objects with the loader we specify.
305:        class LoaderObjectInputStream extends ObjectInputStream {
306:
307:            private ClassLoader loader;
308:
309:            public LoaderObjectInputStream(InputStream in, ClassLoader loader)
310:                    throws IOException, StreamCorruptedException {
311:                super (in);
312:                this .loader = loader;
313:            }
314:
315:            /**
316:             * Subclasses may implement this method to allow classes to be
317:             * fetched from an alternate source. 
318:             *
319:             * The corresponding method in ObjectOutputStream is
320:             * annotateClass.  This method will be invoked only once for each
321:             * unique class in the stream.  This method can be implemented by
322:             * subclasses to use an alternate loading mechanism but must
323:             * return a Class object.  Once returned, the serialVersionUID of the
324:             * class is compared to the serialVersionUID of the serialized class.
325:             * If there is a mismatch, the deserialization fails and an exception
326:             * is raised. <p>
327:             *
328:             * By default the class name is resolved relative to the class
329:             * that called readObject. <p>
330:             *
331:             * @exception ClassNotFoundException If class of
332:             * a serialized object cannot be found.
333:             * @since     JDK1.1
334:             */
335:            protected Class resolveClass(ObjectStreamClass v)
336:                    throws IOException, ClassNotFoundException {
337:                if (loader != null) {
338:                    return loader.loadClass(v.getName());
339:                } else {
340:                    return super.resolveClass(v);
341:                }
342:            }
343:
344:        }
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