Source Code Cross Referenced for AbstractTransactionManager.java in  » Database-ORM » ODAL » com » completex » objective » components » persistency » transact » impl » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database ORM » ODAL » com.completex.objective.components.persistency.transact.impl 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**
002:         *  Objective Database Abstraction Layer (ODAL)
003:         *  Copyright (c) 2004, The ODAL Development Group
004:         *  All rights reserved.
005:         *  For definition of the ODAL Development Group please refer to LICENCE.txt file
006:         *
007:         *  Distributable under LGPL license.
008:         *  See terms of license at gnu.org.
009:         */package com.completex.objective.components.persistency.transact.impl;
010:
011:        import com.completex.objective.components.OdalRuntimeException;
012:        import com.completex.objective.components.log.Log;
013:        import com.completex.objective.components.persistency.OdalPersistencyException;
014:        import com.completex.objective.components.persistency.OdalRuntimePersistencyException;
015:        import com.completex.objective.components.persistency.mapper.ThreadSession;
016:        import com.completex.objective.components.persistency.transact.Transaction;
017:        import com.completex.objective.components.persistency.transact.TransactionManager;
018:
019:        import java.sql.CallableStatement;
020:        import java.sql.Connection;
021:        import java.sql.PreparedStatement;
022:        import java.sql.ResultSet;
023:        import java.sql.SQLException;
024:        import java.sql.Statement;
025:
026:        /**
027:         * @author Gennady Krizhevsky
028:         */
029:        public abstract class AbstractTransactionManager implements 
030:                TransactionManager {
031:
032:            private Log logger = Log.NULL_LOGGER;
033:            private TransactionContainer transactionContainer = new TransactionContainer();
034:            private boolean checkForBadConnection;
035:            private int maxAttempts = 5;
036:            private boolean clearSessionOnTransactionRelease = true;
037:
038:            protected AbstractTransactionManager() {
039:            }
040:
041:            /**
042:             * @param logger
043:             */
044:            protected AbstractTransactionManager(Log logger) {
045:                setLogger(logger);
046:            }
047:
048:            /**
049:             * @return Log
050:             */
051:            public Log getLogger() {
052:                return logger;
053:            }
054:
055:            /**
056:             * @param logger
057:             */
058:            public void setLogger(Log logger) {
059:                if (logger != null) {
060:                    this .logger = logger;
061:                }
062:            }
063:
064:            /**
065:             * @return created Connection
066:             * @throws SQLException
067:             */
068:            abstract protected Connection createConnection()
069:                    throws SQLException;
070:
071:            /**
072:             * Close/release connection
073:             *
074:             * @param connection
075:             * @throws SQLException
076:             */
077:            abstract protected void destroyConnection(Connection connection)
078:                    throws SQLException;
079:
080:            /**
081:             * @param connection
082:             * @param sql
083:             * @return new PreparedStatement
084:             * @throws SQLException
085:             */
086:            abstract protected PreparedStatement prepareStatement(
087:                    Connection connection, String sql) throws SQLException;
088:
089:            /**
090:             * @param connection
091:             * @param sql
092:             * @return new CallableStatement
093:             * @throws SQLException
094:             */
095:            abstract protected CallableStatement prepareCall(
096:                    Connection connection, String sql) throws SQLException;
097:
098:            /**
099:             * @param connection
100:             * @param statement
101:             * @throws SQLException
102:             */
103:            abstract protected void releaseStatement(Connection connection,
104:                    PreparedStatement statement) throws SQLException;
105:
106:            /**
107:             * Something like "select 1 from dual" for oracle.Should delegate it to
108:             * underlying DatabasePolicy
109:             *
110:             * @return Connection Validation Statement - String
111:             */
112:            abstract protected String getConnectionValidationStatement();
113:
114:            /**
115:             * @return new Transaction
116:             * @throws OdalPersistencyException
117:             * @see com.completex.objective.components.persistency.transact.TransactionManager#begin()
118:             */
119:            public Transaction begin() throws OdalPersistencyException {
120:                Transaction transaction = beginAssureActive();
121:                if (getLogger().isDebugEnabled()) {
122:                    getLogger().debug(
123:                            "BEGIN TRANSACTION "
124:                                    + transaction.connectionToString());
125:                }
126:                return transaction;
127:            }
128:
129:            public Transaction beginUnchecked() {
130:                try {
131:                    return begin();
132:                } catch (OdalPersistencyException e) {
133:                    throw new OdalRuntimeException(e.getClass().getName()
134:                            + ": " + e.getMessage());
135:                }
136:            }
137:
138:            public void rollbackUnchecked(Transaction transaction) {
139:                try {
140:                    rollback(transaction);
141:                } catch (SQLException e) {
142:                    throw new OdalRuntimeException(e.getClass().getName()
143:                            + ": " + e.getMessage());
144:                }
145:            }
146:
147:            public void commitUnchecked(Transaction transaction) {
148:                try {
149:                    commit(transaction);
150:                } catch (SQLException e) {
151:                    throw new OdalRuntimeException(e.getClass().getName()
152:                            + ": " + e.getMessage());
153:                }
154:            }
155:
156:            public void rollbackSilently(Transaction transaction) {
157:                if (transaction != null) {
158:                    try {
159:                        rollback(transaction);
160:                    } catch (Exception e) {
161:                        // Silently!
162:                        getLogger().error("", e);
163:                    }
164:                }
165:            }
166:
167:            /**
168:             * @return Transaction
169:             * @throws SQLException
170:             */
171:            private Transaction begin0() throws SQLException {
172:                return new TransactionImpl(createConnection(), getLogger());
173:            }
174:
175:            /**
176:             * @return current transaction
177:             * @see com.completex.objective.components.persistency.transact.TransactionManager#getCurrentTransaction()
178:             */
179:            public Transaction getCurrentTransaction() {
180:                return transactionContainer.peekTransaction();
181:            }
182:
183:            public boolean hasCurrentTransaction() {
184:                return !transactionContainer.isEmpty();
185:            }
186:
187:            /**
188:             * Get Transaction from the pool with validaty check
189:             *
190:             * @return new Transaction
191:             * @throws OdalPersistencyException if Validating statement does not return result
192:             * @throws OdalRuntimePersistencyException
193:             *                                  if cannot get connection in Max attempts
194:             */
195:            protected Transaction beginAssureActive()
196:                    throws OdalPersistencyException {
197:                Throwable cause = null;
198:                int currentSize = 0;
199:                int maxAttempts = getMaxAttempts();
200:                while (currentSize < maxAttempts) {
201:                    try {
202:                        currentSize++;
203:                        Transaction transaction = begin0();
204:                        if (!checkForBadConnection) {
205:                            return transaction;
206:                        }
207:                        Connection connection = transaction.getConnection();
208:                        PreparedStatement st = null;
209:                        ResultSet rs = null;
210:                        try {
211:                            if (getConnectionValidationStatement() != null) {
212:                                st = prepareStatement(transaction
213:                                        .getConnection(),
214:                                        getConnectionValidationStatement());
215:                                rs = st.executeQuery();
216:                                if (!rs.next()) {
217:                                    throw new OdalPersistencyException(
218:                                            "Validating statement did not return result");
219:                                }
220:                                connection.commit();
221:                            } else {
222:                                if (connection.isClosed()) {
223:                                    throw new OdalPersistencyException(
224:                                            "Connection is closed");
225:                                }
226:                            }
227:                            return transaction;
228:                        } catch (Exception e) {
229:                            try {
230:                                connection.close();
231:                            } catch (SQLException e1) {
232:                                // debug("Cannot close connection: " + e1.getMessage());
233:                            }
234:                            releaseBad(connection);
235:                            connection = null;
236:                            cause = e;
237:                        } finally {
238:                            if (rs != null) {
239:                                try {
240:                                    rs.close();
241:                                } catch (Exception e) {
242:                                    logger.error("", e);
243:                                }
244:                            }
245:                            if (connection != null && st != null) {
246:                                try {
247:                                    releaseStatement(connection, st);
248:                                } catch (Exception e) {
249:                                    logger.error("", e);
250:                                }
251:                            }
252:                        }
253:                    } catch (Exception e) {
254:                        //
255:                        // If we are here - the database is dead
256:                        //
257:                        try {
258:                            Thread.sleep(500);
259:                        } catch (InterruptedException e1) {
260:                            // Do nothing
261:                        }
262:                        if (e instanceof  NullPointerException) {
263:                            throw ((NullPointerException) e);
264:                        }
265:                        cause = e;
266:                    }
267:                }
268:                throw new OdalPersistencyException("Cannot get connection in ["
269:                        + getMaxAttempts() + "] attempts", cause);
270:            }
271:
272:            /**
273:             * @param checkForBadConnection true if check is required
274:             */
275:            public void setCheckForBadConnection(boolean checkForBadConnection) {
276:                this .checkForBadConnection = checkForBadConnection;
277:            }
278:
279:            /**
280:             * Does not reset default value if maxAttempts <= 1
281:             *
282:             * @param maxAttempts
283:             */
284:            public void setMaxAttempts(int maxAttempts) {
285:                if (maxAttempts > 1) {
286:                    this .maxAttempts = maxAttempts;
287:                }
288:            }
289:
290:            /**
291:             * @return max attempts until giving up on beginnign transaction
292:             */
293:            public int getMaxAttempts() {
294:                return maxAttempts;
295:            }
296:
297:            /**
298:             * Remove bad connection from connection pool
299:             *
300:             * @param connection
301:             */
302:            protected abstract void releaseBad(Connection connection);
303:
304:            /**
305:             * @see TransactionManager#commit(com.completex.objective.components.persistency.transact.Transaction)
306:             */
307:            public void commit(Transaction transaction) throws SQLException {
308:                transactionContainer.validateTransactionForRelease(transaction);
309:                transaction.commit();
310:            }
311:
312:            /**
313:             * @see TransactionManager#rollback(com.completex.objective.components.persistency.transact.Transaction)
314:             */
315:            public void rollback(Transaction transaction) throws SQLException {
316:                transactionContainer.validateTransactionForRelease(transaction);
317:                transaction.rollback();
318:            }
319:
320:            /**
321:             * @see TransactionManager#release(com.completex.objective.components.persistency.transact.Transaction)
322:             */
323:            public Transaction releaseTransaction(Transaction transaction) {
324:                try {
325:                    transactionContainer
326:                            .validateTransactionForRelease(transaction);
327:                    transactionContainer.popTransaction();
328:                    if (clearSessionOnTransactionRelease) {
329:                        ThreadSession.clear();
330:                    }
331:                    if (getLogger().isDebugEnabled()) {
332:                        getLogger().debug(
333:                                "RELEASE TRANSACTION "
334:                                        + transaction.connectionToString());
335:                    }
336:                } finally {
337:                    if (transaction != null) {
338:                        transaction.clearListerners();
339:                    }
340:                }
341:
342:                return transaction;
343:            }
344:
345:            /**
346:             * Make transaction current
347:             *
348:             * @param transaction
349:             * @return transaction that is used as parameter
350:             */
351:            public Transaction beginTransaction(Transaction transaction) {
352:                return transactionContainer.pushTransaction(transaction);
353:            }
354:
355:            /**
356:             * @param connection
357:             * @return new Statement
358:             * @throws OdalPersistencyException
359:             */
360:            protected Statement createStatement(Connection connection)
361:                    throws OdalPersistencyException {
362:                try {
363:                    return connection.createStatement();
364:                } catch (SQLException e) {
365:                    throw new OdalPersistencyException(e);
366:                }
367:            }
368:
369:            public boolean isClearSessionOnTransactionRelease() {
370:                return clearSessionOnTransactionRelease;
371:            }
372:
373:            public void setClearSessionOnTransactionRelease(
374:                    boolean clearSessionOnTransactionRelease) {
375:                this .clearSessionOnTransactionRelease = clearSessionOnTransactionRelease;
376:            }
377:
378:            /**
379:             * Basic Transaction implementation
380:             */
381:            private class TransactionImpl extends AbstractTransactionImpl {
382:
383:                public TransactionImpl(Connection connection, Log logger) {
384:                    super (connection, logger);
385:                }
386:
387:                public TransactionImpl(Connection connection) {
388:                    super (connection);
389:                }
390:
391:                public Statement createStatement()
392:                        throws OdalPersistencyException {
393:                    return AbstractTransactionManager.this 
394:                            .createStatement(getConnection());
395:                }
396:
397:                public PreparedStatement prepareStatement(String sql)
398:                        throws SQLException {
399:                    return AbstractTransactionManager.this .prepareStatement(
400:                            getConnection(), sql);
401:                }
402:
403:                public CallableStatement prepareCall(String sql)
404:                        throws SQLException {
405:                    return AbstractTransactionManager.this .prepareCall(
406:                            getConnection(), sql);
407:                }
408:
409:                public void releaseStatement(PreparedStatement statement)
410:                        throws SQLException {
411:                    AbstractTransactionManager.this.releaseStatement(
412:                            getConnection(), statement);
413:                }
414:            }
415:
416:        }
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