Source Code Cross Referenced for DriverCompliance.java in  » Database-JDBC-Connection-Pool » sequoia-2.10.9 » org » continuent » sequoia » controller » backend » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database JDBC Connection Pool » sequoia 2.10.9 » org.continuent.sequoia.controller.backend 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**
002:         * Sequoia: Database clustering technology.
003:         * Copyright (C) 2002-2004 French National Institute For Research In Computer
004:         * Science And Control (INRIA).
005:         * Contact: sequoia@continuent.org
006:         * 
007:         * Licensed under the Apache License, Version 2.0 (the "License");
008:         * you may not use this file except in compliance with the License.
009:         * You may obtain a copy of the License at
010:         * 
011:         * http://www.apache.org/licenses/LICENSE-2.0
012:         * 
013:         * Unless required by applicable law or agreed to in writing, software
014:         * distributed under the License is distributed on an "AS IS" BASIS,
015:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016:         * See the License for the specific language governing permissions and
017:         * limitations under the License. 
018:         *
019:         * Initial developer(s): Emmanuel Cecchet. 
020:         * Contributor(s): ______________________.
021:         */package org.continuent.sequoia.controller.backend;
022:
023:        import java.net.ConnectException;
024:        import java.sql.Connection;
025:        import java.sql.DatabaseMetaData;
026:        import java.sql.ResultSet;
027:        import java.sql.Statement;
028:
029:        import org.continuent.sequoia.common.i18n.Translate;
030:        import org.continuent.sequoia.common.log.Trace;
031:        import org.continuent.sequoia.controller.connection.DriverManager;
032:
033:        /**
034:         * This class checks if a given driver provides the mandatory features necessary
035:         * for Sequoia.
036:         * 
037:         * @author <a href="mailto:Emmanuel.Cecchet@inria.fr">Emmanuel Cecchet </a>
038:         * @version 1.0
039:         */
040:        public class DriverCompliance {
041:            private boolean isCompliant = false;
042:            private boolean hasBeenTested = false;
043:            private boolean supportSetQueryTimeout = false;
044:            private boolean supportGetGeneratedKeys = false;
045:            private boolean supportGetColumnCount = false;
046:            private boolean supportGetColumnClassName = false;
047:            private boolean supportGetColumnTypeName = false;
048:            private boolean supportGetColumnType = false;
049:            private boolean supportGetColumnDisplaySize = false;
050:            private boolean supportGetTableName = false;
051:            private boolean supportSetCursorName = false;
052:            private boolean supportSetFetchSize = false;
053:            private boolean supportSerializableIsolation = false;
054:            private boolean supportSetMaxRows = false;
055:
056:            private Trace logger;
057:
058:            private static final int TIMEOUT_VALUE = 1000;
059:            private static final String DEFAULT_TEST_STATEMENT = "select 1";
060:            private String databaseProductName = "Sequoia";
061:
062:            /**
063:             * Builds a new DriverCompliance object.
064:             * 
065:             * @param logger the logger to use
066:             */
067:            public DriverCompliance(Trace logger) {
068:                this .logger = logger;
069:            }
070:
071:            /**
072:             * Check the driver compliance.
073:             * 
074:             * @param backendUrl the JDBC URL to connect to
075:             * @param login the user login
076:             * @param password the user password
077:             * @param driverPath path for driver
078:             * @param driverClassName class name for driver
079:             * @param connectionTestStatement SQL statement used to check if a connection
080:             *          is still valid
081:             * @return true if the driver is Sequoia compliant
082:             * @throws ConnectException if it is not possible to connect to the backend
083:             */
084:            public boolean complianceTest(String backendUrl, String login,
085:                    String password, String driverPath, String driverClassName,
086:                    String connectionTestStatement) throws ConnectException {
087:                if (hasBeenTested)
088:                    return isCompliant;
089:
090:                isCompliant = false;
091:
092:                //
093:                // Connection test
094:                //
095:                Connection c = null;
096:                try {
097:                    c = DriverManager.getConnection(backendUrl, login,
098:                            password, driverPath, driverClassName);
099:                } catch (Exception e) {
100:                    if (logger.isDebugEnabled())
101:                        logger.error(Translate.get(
102:                                "backend.driver.test.connection.failed", e), e);
103:                    else
104:                        logger.error(Translate.get(
105:                                "backend.driver.test.connection.failed", e));
106:                    throw (ConnectException) new ConnectException(e
107:                            .getMessage()).initCause(e);
108:                }
109:
110:                if (c == null) { // SEQUOIA-735 fix
111:                    String msg = Translate.get(
112:                            "backend.driver.test.connection.failed",
113:                            "DriverManager returned an unexpected null connection for "
114:                                    + backendUrl + " using driver "
115:                                    + driverClassName);
116:                    logger.error(msg);
117:                    throw new ConnectException(msg);
118:                }
119:
120:                if (logger.isDebugEnabled())
121:                    logger.debug(Translate
122:                            .get("backend.driver.test.connection.ok"));
123:
124:                //
125:                // Transaction isolation (serializable)
126:                //
127:                try {
128:                    c
129:                            .setTransactionIsolation(Connection.TRANSACTION_SERIALIZABLE);
130:                    supportSerializableIsolation = true;
131:                } catch (Exception e) {
132:                    if (logger.isDebugEnabled())
133:                        logger
134:                                .error(
135:                                        Translate
136:                                                .get(
137:                                                        "backend.driver.test.serializable.isolation.failed",
138:                                                        e), e);
139:                    else
140:                        logger
141:                                .error(Translate
142:                                        .get(
143:                                                "backend.driver.test.serializable.isolation.failed",
144:                                                e));
145:                }
146:                if (logger.isDebugEnabled())
147:                    logger
148:                            .debug(Translate
149:                                    .get("backend.driver.test.serializable.isolation.ok"));
150:
151:                //
152:                // Connection meta data
153:                //
154:                DatabaseMetaData connectionMetaData;
155:                try {
156:                    connectionMetaData = c.getMetaData();
157:                } catch (Exception e) {
158:                    if (logger.isDebugEnabled())
159:                        logger.error(Translate.get(
160:                                "backend.driver.test.metadata.failed", e), e);
161:                    else
162:                        logger.error(Translate.get(
163:                                "backend.driver.test.metadata.failed", e));
164:                    return isCompliant;
165:                }
166:                if (logger.isDebugEnabled())
167:                    logger.debug(Translate
168:                            .get("backend.driver.test.metadata.ok"));
169:
170:                try {
171:                    this .databaseProductName = connectionMetaData
172:                            .getDatabaseProductName();
173:                    logger.info(Translate.get("backend.detected.as",
174:                            this .databaseProductName));
175:                } catch (Exception e) {
176:                    logger
177:                            .warn(Translate
178:                                    .get("backend.driver.test.database.productname.failed"));
179:                }
180:
181:                //
182:                // Statement
183:                //
184:                Statement s;
185:                try {
186:                    s = c.createStatement();
187:                } catch (Exception e) {
188:                    if (logger.isDebugEnabled())
189:                        logger.error(Translate.get(
190:                                "backend.driver.test.statement.failed", e), e);
191:                    else
192:                        logger.error(Translate.get(
193:                                "backend.driver.test.statement.failed", e));
194:                    return isCompliant;
195:                }
196:
197:                try {
198:                    if (connectionTestStatement == null) {
199:                        if (logger.isDebugEnabled())
200:                            logger.debug(Translate.get(
201:                                    "backend.driver.using.default.statement",
202:                                    DEFAULT_TEST_STATEMENT));
203:                        connectionTestStatement = DEFAULT_TEST_STATEMENT;
204:                    }
205:                    s.execute(connectionTestStatement);
206:                } catch (Exception e) {
207:                    if (logger.isDebugEnabled())
208:                        logger.error(Translate.get(
209:                                "backend.driver.test.statement.invalid",
210:                                new String[] { connectionTestStatement,
211:                                        e.getMessage() }), e);
212:                    else
213:                        logger.error(Translate.get(
214:                                "backend.driver.test.statement.invalid",
215:                                new String[] { connectionTestStatement,
216:                                        e.getMessage() }));
217:                    return isCompliant;
218:                }
219:                if (logger.isDebugEnabled())
220:                    logger.debug(Translate
221:                            .get("backend.driver.test.statement.ok"));
222:
223:                //
224:                // Set cursor name
225:                //
226:                try {
227:                    s.setCursorName("testcursor");
228:                    supportSetCursorName = true;
229:                    if (logger.isDebugEnabled())
230:                        logger
231:                                .debug(Translate
232:                                        .get("backend.driver.statement.setCursorName.ok"));
233:                } catch (Exception e1) {
234:                    logger
235:                            .warn(Translate
236:                                    .get("backend.driver.statement.setCursorName.failed"));
237:                    supportSetMaxRows = false;
238:                }
239:
240:                //
241:                // Set fetch size
242:                //
243:                try {
244:                    s.setFetchSize(25);
245:                    supportSetFetchSize = true;
246:                    if (logger.isDebugEnabled())
247:                        logger
248:                                .debug(Translate
249:                                        .get("backend.driver.statement.setFetchSize.ok"));
250:                } catch (Exception e1) {
251:                    logger
252:                            .warn(Translate
253:                                    .get("backend.driver.statement.setFetchSize.failed"));
254:                    supportSetMaxRows = false;
255:                }
256:
257:                //
258:                // Set max rows
259:                //
260:                try {
261:                    s.setMaxRows(5);
262:                    supportSetMaxRows = true;
263:                    if (logger.isDebugEnabled())
264:                        logger.debug(Translate
265:                                .get("backend.driver.statement.setMaxRows.ok"));
266:                } catch (Exception e1) {
267:                    logger.warn(Translate
268:                            .get("backend.driver.statement.setMaxRows.failed"));
269:                    supportSetMaxRows = false;
270:                }
271:
272:                //
273:                // Get generated keys
274:                //
275:                try {
276:                    s.getGeneratedKeys();
277:                    supportGetGeneratedKeys = true;
278:                    if (logger.isDebugEnabled())
279:                        logger
280:                                .debug(Translate
281:                                        .get("backend.driver.statement.getGeneratedKeys.ok"));
282:                } catch (Exception e1) {
283:                    logger
284:                            .warn(Translate
285:                                    .get("backend.driver.statement.getGeneratedKeys.failed"));
286:                    supportGetGeneratedKeys = false;
287:                } catch (AbstractMethodError e1) {
288:                    logger
289:                            .warn(Translate
290:                                    .get("backend.driver.statement.getGeneratedKeys.failed"));
291:                    supportGetGeneratedKeys = false;
292:                } catch (java.lang.NoSuchMethodError e1) {
293:                    logger
294:                            .warn(Translate
295:                                    .get("backend.driver.statement.getGeneratedKeys.failed"));
296:                    supportGetGeneratedKeys = false;
297:                }
298:
299:                // Commented out:
300:                // A prepared statement can be sent to the DBMS right away to be compiled
301:                // Should fine a work around for this test.
302:
303:                // PreparedStatement ps;
304:                // try
305:                // {
306:                // ps = c.prepareStatement("INSERT INTO versions VALUES (?,?)");
307:                // ps.setInt(1, 10);
308:                // ps.setString(2, "just a test");
309:                // }
310:                // catch (Exception e)
311:                // {
312:                // logger.warn(Translate.get("backend.driver.prepared.statement.failed"),
313:                // e);
314:                // }
315:                // if (logger.isDebugEnabled())
316:                // logger.debug(Translate.get("backend.driver.prepared.statement.ok"));
317:
318:                //
319:                // Set Query Timeout
320:                //
321:                try {
322:                    s.setQueryTimeout(TIMEOUT_VALUE);
323:                    supportSetQueryTimeout = true;
324:                } catch (Exception e) {
325:                    logger.warn(Translate.get(
326:                            "backend.driver.setQueryTimeout.failed", e));
327:                }
328:                if (supportSetQueryTimeout && logger.isDebugEnabled())
329:                    logger.debug(Translate
330:                            .get("backend.driver.setQueryTimeout.ok"));
331:
332:                //
333:                // Get tables
334:                //
335:                ResultSet rs;
336:                try {
337:                    String[] types = { "TABLE", "VIEW" };
338:                    rs = connectionMetaData.getTables(null, null, "%", types);
339:                } catch (Exception e) {
340:                    if (logger.isDebugEnabled())
341:                        logger.error(Translate.get(
342:                                "backend.driver.metadata.getTables.failed", e),
343:                                e);
344:                    else
345:                        logger.error(Translate.get(
346:                                "backend.driver.metadata.getTables.failed", e));
347:                    return isCompliant;
348:                }
349:                if (logger.isDebugEnabled())
350:                    logger.debug(Translate
351:                            .get("backend.driver.metadata.getTables.ok"));
352:
353:                //
354:                // Get MetaData
355:                //
356:                java.sql.ResultSetMetaData rsMetaData;
357:                try {
358:                    rsMetaData = rs.getMetaData();
359:                } catch (Exception e) {
360:                    if (logger.isDebugEnabled())
361:                        logger.error(Translate.get(
362:                                "backend.driver.resultset.getMetaData.failed",
363:                                e), e);
364:                    else
365:                        logger.error(Translate.get(
366:                                "backend.driver.resultset.getMetaData.failed",
367:                                e));
368:                    return isCompliant;
369:                }
370:                if (logger.isDebugEnabled())
371:                    logger.debug(Translate
372:                            .get("backend.driver.resultset.getMetaData.ok"));
373:
374:                //
375:                // ResultSet.getObject()
376:                //
377:                try {
378:                    if (rs.next() && (rsMetaData.getColumnCount() > 0)) {
379:                        rs.getObject(1);
380:                    } else
381:                        logger
382:                                .warn(Translate
383:                                        .get("backend.driver.resultset.getObject.unable"));
384:                } catch (Exception e) {
385:                    if (logger.isDebugEnabled())
386:                        logger
387:                                .error(
388:                                        Translate
389:                                                .get(
390:                                                        "backend.driver.resultset.getObject.failed",
391:                                                        e), e);
392:                    else
393:                        logger
394:                                .error(Translate
395:                                        .get(
396:                                                "backend.driver.resultset.getObject.failed",
397:                                                e));
398:                    return isCompliant;
399:                }
400:                if (logger.isDebugEnabled())
401:                    logger.debug(Translate
402:                            .get("backend.driver.resultset.getObject.ok"));
403:
404:                try {
405:                    rsMetaData.getColumnCount();
406:                    supportGetColumnCount = true;
407:                } catch (Exception e) {
408:                    if (logger.isDebugEnabled())
409:                        logger
410:                                .error(
411:                                        Translate
412:                                                .get(
413:                                                        "backend.driver.metadata.getColumnCount.failed",
414:                                                        e), e);
415:                    else
416:                        logger
417:                                .error(Translate
418:                                        .get(
419:                                                "backend.driver.metadata.getColumnCount.failed",
420:                                                e));
421:                    return isCompliant;
422:                }
423:                if (supportGetColumnCount && logger.isDebugEnabled())
424:                    logger.debug(Translate
425:                            .get("backend.driver.metadata.getColumnCount.ok"));
426:
427:                try {
428:                    rsMetaData.getColumnName(1);
429:                } catch (Exception e) {
430:                    if (logger.isDebugEnabled())
431:                        logger.error(Translate.get(
432:                                "backend.driver.metadata.getColumnName.failed",
433:                                e), e);
434:                    else
435:                        logger.error(Translate.get(
436:                                "backend.driver.metadata.getColumnName.failed",
437:                                e));
438:                    return isCompliant;
439:                }
440:                if (logger.isDebugEnabled())
441:                    logger.debug(Translate
442:                            .get("backend.driver.metadata.getColumnName.ok"));
443:
444:                try {
445:                    rsMetaData.getTableName(1);
446:                    supportGetTableName = true;
447:                } catch (Exception e) {
448:                    logger.warn(Translate.get(
449:                            "backend.driver.metadata.getTableName.failed", e));
450:                }
451:
452:                if (supportGetTableName && logger.isDebugEnabled())
453:                    logger.debug(Translate
454:                            .get("backend.driver.metadata.getTableName.ok"));
455:
456:                try {
457:                    rsMetaData.getColumnDisplaySize(1);
458:                    supportGetColumnDisplaySize = true;
459:                } catch (Exception e) {
460:                    logger
461:                            .warn(Translate
462:                                    .get(
463:                                            "backend.driver.metadata.getColumnDisplaySize.failed",
464:                                            e));
465:                }
466:                if (supportGetColumnDisplaySize && logger.isDebugEnabled())
467:                    logger
468:                            .debug(Translate
469:                                    .get("backend.driver.metadata.getColumnDisplaySize.ok"));
470:
471:                try {
472:                    rsMetaData.getColumnType(1);
473:                    supportGetColumnType = true;
474:                } catch (Exception e) {
475:                    logger.warn(Translate.get(
476:                            "backend.driver.metadata.getColumnType.failed", e));
477:                }
478:                if (supportGetColumnType && logger.isDebugEnabled())
479:                    logger.debug(Translate
480:                            .get("backend.driver.metadata.getColumnType.ok"));
481:
482:                try {
483:                    rsMetaData.getColumnTypeName(1);
484:                    supportGetColumnTypeName = true;
485:                } catch (Exception e) {
486:                    logger.warn(Translate.get(
487:                            "backend.driver.metadata.getColumnTypeName.failed",
488:                            e));
489:                }
490:                if (supportGetColumnTypeName && logger.isDebugEnabled())
491:                    logger
492:                            .debug(Translate
493:                                    .get("backend.driver.metadata.getColumnTypeName.ok"));
494:
495:                try {
496:                    rsMetaData.getColumnClassName(1);
497:                    supportGetColumnClassName = true;
498:                } catch (Exception e) {
499:                    logger
500:                            .warn(Translate
501:                                    .get(
502:                                            "backend.driver.metadata.getColumnClassName.failed",
503:                                            e));
504:                }
505:                if (supportGetColumnClassName && logger.isDebugEnabled())
506:                    logger
507:                            .debug(Translate
508:                                    .get("backend.driver.metadata.getColumnClassName.ok"));
509:
510:                isCompliant = true;
511:                hasBeenTested = true;
512:                return isCompliant;
513:            }
514:
515:            /**
516:             * Returns the databaseProductName value.
517:             * 
518:             * @return Returns the databaseProductName.
519:             */
520:            public String getDatabaseProductName() {
521:                return this .databaseProductName;
522:            }
523:
524:            /**
525:             * @return true if the driver is compliant to the Sequoia requirements
526:             */
527:            public boolean isCompliant() {
528:                return isCompliant;
529:            }
530:
531:            /**
532:             * @return true if the driver supports getGeneratedKeys
533:             */
534:            public boolean supportGetGeneratedKeys() {
535:                return supportGetGeneratedKeys;
536:            }
537:
538:            /**
539:             * @return true if the driver supports getColumnClassName
540:             */
541:            public boolean supportGetColumnClassName() {
542:                return supportGetColumnClassName;
543:            }
544:
545:            /**
546:             * @return true if the driver supports getColumnCount
547:             */
548:            public boolean supportGetColumnCount() {
549:                return supportGetColumnCount;
550:            }
551:
552:            /**
553:             * @return true if the driver supports getColumnDisplaySize
554:             */
555:            public boolean supportGetColumnDisplaySize() {
556:                return supportGetColumnDisplaySize;
557:            }
558:
559:            /**
560:             * @return true if the driver supports getColumnType
561:             */
562:            public boolean supportGetColumnType() {
563:                return supportGetColumnType;
564:            }
565:
566:            /**
567:             * @return true if the driver supports getColumnTypeName
568:             */
569:            public boolean supportGetColumnTypeName() {
570:                return supportGetColumnTypeName;
571:            }
572:
573:            /**
574:             * @return true if the driver supports getTableName
575:             */
576:            public boolean supportGetTableName() {
577:                return supportGetTableName;
578:            }
579:
580:            /**
581:             * Returns the supportSetCursorName value.
582:             * 
583:             * @return Returns the supportSetCursorName.
584:             */
585:            public boolean supportSetCursorName() {
586:                return supportSetCursorName;
587:            }
588:
589:            /**
590:             * Returns the supportSetFetchSize value.
591:             * 
592:             * @return Returns the supportSetFetchSize.
593:             */
594:            public boolean supportSetFetchSize() {
595:                return supportSetFetchSize;
596:            }
597:
598:            /**
599:             * Returns the supportSerializableIsolation value.
600:             * 
601:             * @return Returns the supportSerializableIsolation.
602:             */
603:            public final boolean supportSerializableIsolation() {
604:                return supportSerializableIsolation;
605:            }
606:
607:            /**
608:             * @return true if the driver supports Statement.setMaxRows
609:             */
610:            public boolean supportSetMaxRows() {
611:                return supportSetMaxRows;
612:            }
613:
614:            /**
615:             * @return true if the driver supports setQueryTimeout
616:             */
617:            public boolean supportSetQueryTimeout() {
618:                return supportSetQueryTimeout;
619:            }
620:        }
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