Source Code Cross Referenced for CallableStatementExecuteQueryTask.java in  » Database-JDBC-Connection-Pool » sequoia-2.10.9 » org » continuent » sequoia » controller » loadbalancer » tasks » 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.loadbalancer.tasks 
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:         * Copyright (C) 2005 AmicoSoft, Inc. dba Emic Networks
006:         * Copyright (C) 2005-2006 Continuent, Inc.
007:         * Contact: sequoia@continuent.org
008:         * 
009:         * Licensed under the Apache License, Version 2.0 (the "License");
010:         * you may not use this file except in compliance with the License.
011:         * You may obtain a copy of the License at
012:         * 
013:         * http://www.apache.org/licenses/LICENSE-2.0
014:         * 
015:         * Unless required by applicable law or agreed to in writing, software
016:         * distributed under the License is distributed on an "AS IS" BASIS,
017:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018:         * See the License for the specific language governing permissions and
019:         * limitations under the License. 
020:         *
021:         * Initial developer(s): Emmanuel Cecchet.
022:         * Contributor(s): ______________________.
023:         */package org.continuent.sequoia.controller.loadbalancer.tasks;
024:
025:        import java.sql.Connection;
026:        import java.sql.SQLException;
027:
028:        import org.continuent.sequoia.common.exceptions.NoTransactionStartWhenDisablingException;
029:        import org.continuent.sequoia.common.exceptions.UnreachableBackendException;
030:        import org.continuent.sequoia.common.i18n.Translate;
031:        import org.continuent.sequoia.common.log.Trace;
032:        import org.continuent.sequoia.common.sql.schema.DatabaseProcedureSemantic;
033:        import org.continuent.sequoia.controller.backend.DatabaseBackend;
034:        import org.continuent.sequoia.controller.backend.result.ControllerResultSet;
035:        import org.continuent.sequoia.controller.cache.metadata.MetadataCache;
036:        import org.continuent.sequoia.controller.connection.AbstractConnectionManager;
037:        import org.continuent.sequoia.controller.connection.PooledConnection;
038:        import org.continuent.sequoia.controller.loadbalancer.AbstractLoadBalancer;
039:        import org.continuent.sequoia.controller.loadbalancer.BackendWorkerThread;
040:        import org.continuent.sequoia.controller.requests.AbstractRequest;
041:        import org.continuent.sequoia.controller.requests.StoredProcedure;
042:
043:        /**
044:         * Executes a <code>StoredProcedure</code> call using
045:         * CallableStatement.executeQuery() and returns a ResultSet.
046:         * 
047:         * @author <a href="mailto:Emmanuel.Cecchet@inria.fr">Emmanuel Cecchet </a>
048:         * @version 1.0
049:         */
050:        public class CallableStatementExecuteQueryTask extends AbstractTask {
051:            private StoredProcedure proc;
052:            private ControllerResultSet result = null;
053:            private MetadataCache metadataCache;
054:
055:            static Trace endUserLogger = Trace
056:                    .getLogger("org.continuent.sequoia.enduser");
057:
058:            /**
059:             * Creates a new <code>CallableStatementExecuteQueryTask</code>.
060:             * 
061:             * @param nbToComplete number of threads that must succeed before returning
062:             * @param totalNb total number of threads
063:             * @param proc the <code>StoredProcedure</code> to call
064:             * @param metadataCache the metadataCache if any or null
065:             */
066:            public CallableStatementExecuteQueryTask(int nbToComplete,
067:                    int totalNb, StoredProcedure proc,
068:                    MetadataCache metadataCache) {
069:                super (nbToComplete, totalNb, proc.isPersistentConnection(),
070:                        proc.getPersistentConnectionId());
071:                this .proc = proc;
072:                this .metadataCache = metadataCache;
073:            }
074:
075:            /**
076:             * Call a stored procedure that returns a ResultSet on the given backend
077:             * thread.
078:             * 
079:             * @param backendThread the backend thread that will execute the task
080:             * @throws SQLException if an error occurs
081:             */
082:            public void executeTask(BackendWorkerThread backendThread)
083:                    throws SQLException {
084:                DatabaseBackend backend = backendThread.getBackend();
085:
086:                try {
087:                    AbstractConnectionManager cm = backend
088:                            .getConnectionManager(proc.getLogin());
089:                    if (cm == null) {
090:                        SQLException se = new SQLException(
091:                                "No Connection Manager for Virtual Login:"
092:                                        + proc.getLogin());
093:                        try {
094:                            notifyFailure(backendThread, -1, se);
095:                        } catch (SQLException ignore) {
096:
097:                        }
098:                        throw se;
099:                    }
100:
101:                    Trace logger = backendThread.getLogger();
102:                    if (proc.isAutoCommit())
103:                        executeInAutoCommit(backendThread, backend, cm, logger);
104:                    else
105:                        executeInTransaction(backendThread, backend, cm, logger);
106:
107:                    if (result != null)
108:                        notifySuccess(backendThread);
109:                } finally {
110:                    backend.getTaskQueues().completeStoredProcedureExecution(
111:                            this );
112:                }
113:            }
114:
115:            private void executeInAutoCommit(BackendWorkerThread backendThread,
116:                    DatabaseBackend backend, AbstractConnectionManager cm,
117:                    Trace logger) throws SQLException {
118:                if (!backend.canAcceptTasks(proc)) {
119:                    // Backend is disabling, we do not execute queries except the one in
120:                    // the
121:                    // transaction we already started. Just notify the completion for the
122:                    // others.
123:                    notifyCompletion(backendThread);
124:                    return;
125:                }
126:
127:                // Use a connection just for this request
128:                PooledConnection c = null;
129:                try {
130:                    c = cm.retrieveConnectionInAutoCommit(proc);
131:                } catch (UnreachableBackendException e1) {
132:                    SQLException se = new SQLException("Backend "
133:                            + backend.getName() + " is no more reachable.");
134:                    try {
135:                        notifyFailure(backendThread, -1, se);
136:                    } catch (SQLException ignore) {
137:                    }
138:                    // Disable this backend (it is no more in sync) by killing the backend
139:                    // thread
140:                    backendThread.getLoadBalancer().disableBackend(backend,
141:                            true);
142:                    String msg = Translate.get(
143:                            "loadbalancer.backend.disabling.unreachable",
144:                            backend.getName());
145:                    logger.error(msg);
146:                    endUserLogger.error(msg);
147:                    throw se;
148:                }
149:
150:                // Sanity check
151:                if (c == null) {
152:                    SQLException se = new SQLException("No more connections");
153:                    try { // All backends failed, just ignore
154:                        if (!notifyFailure(backendThread,
155:                                proc.getTimeout() * 1000L, se))
156:                            return;
157:                    } catch (SQLException ignore) {
158:                    }
159:                    // Disable this backend (it is no more in sync) by killing the backend
160:                    // thread
161:                    backendThread.getLoadBalancer().disableBackend(backend,
162:                            true);
163:                    String msg = "Stored procedure '"
164:                            + proc.getSqlShortForm(backend
165:                                    .getSqlShortFormLength())
166:                            + "' failed on backend " + backend.getName()
167:                            + " but " + getSuccess() + " succeeded (" + se
168:                            + ")";
169:                    logger.error(msg);
170:                    endUserLogger.error(Translate
171:                            .get("loadbalancer.backend.disabling", backend
172:                                    .getName()));
173:                    throw new SQLException(msg);
174:                }
175:
176:                // Execute Query
177:                try {
178:                    result = AbstractLoadBalancer
179:                            .executeCallableStatementExecuteQueryOnBackend(
180:                                    proc, backend, backendThread, c
181:                                            .getConnection(), metadataCache);
182:
183:                    DatabaseProcedureSemantic semantic = proc.getSemantic();
184:                    if ((semantic == null) || semantic.hasDDLWrite())
185:                        backend.setSchemaIsDirty(true, proc);
186:                } catch (Exception e) {
187:                    try { // All backends failed, just ignore
188:                        if (!notifyFailure(backendThread,
189:                                proc.getTimeout() * 1000L, e)) {
190:                            result = null;
191:                            return;
192:                        }
193:                    } catch (SQLException ignore) {
194:                    }
195:                    // Disable this backend (it is no more in sync) by killing the backend
196:                    // thread
197:                    backendThread.getLoadBalancer().disableBackend(backend,
198:                            true);
199:                    String msg = "Stored procedure '"
200:                            + proc.getSqlShortForm(backend
201:                                    .getSqlShortFormLength())
202:                            + "' failed on backend " + backend.getName()
203:                            + " but " + getSuccess() + " succeeded (" + e + ")";
204:                    logger.error(msg);
205:                    endUserLogger.error(Translate
206:                            .get("loadbalancer.backend.disabling", backend
207:                                    .getName()));
208:                    throw new SQLException(msg);
209:                } finally {
210:                    cm.releaseConnectionInAutoCommit(proc, c);
211:                }
212:            }
213:
214:            private void executeInTransaction(
215:                    BackendWorkerThread backendThread, DatabaseBackend backend,
216:                    AbstractConnectionManager cm, Trace logger)
217:                    throws SQLException {
218:                // Re-use the connection used by this transaction
219:                Connection c;
220:                long tid = proc.getTransactionId();
221:
222:                try {
223:                    c = backend
224:                            .getConnectionForTransactionAndLazyBeginIfNeeded(
225:                                    proc, cm);
226:                } catch (UnreachableBackendException ube) {
227:                    SQLException se = new SQLException("Backend "
228:                            + backend.getName() + " is no more reachable.");
229:                    try {
230:                        notifyFailure(backendThread, -1, se);
231:                    } catch (SQLException ignore) {
232:                    }
233:                    // Disable this backend (it is no more in sync) by killing the backend
234:                    // thread
235:                    backendThread.getLoadBalancer().disableBackend(backend,
236:                            true);
237:                    String msg = Translate.get(
238:                            "loadbalancer.backend.disabling.unreachable",
239:                            backend.getName());
240:                    logger.error(msg);
241:                    endUserLogger.error(msg);
242:                    throw se;
243:                } catch (NoTransactionStartWhenDisablingException e) {
244:                    // Backend is disabling, we do not execute queries except the one in
245:                    // the
246:                    // transaction we already started. Just notify the completion for the
247:                    // others.
248:                    notifyCompletion(backendThread);
249:                    return;
250:                } catch (SQLException e1) {
251:                    SQLException se = new SQLException(
252:                            "Unable to get connection for transaction " + tid);
253:                    try { // All backends failed, just ignore
254:                        if (!notifyFailure(backendThread,
255:                                proc.getTimeout() * 1000L, se))
256:                            return;
257:                    } catch (SQLException ignore) {
258:                    }
259:                    // Disable this backend (it is no more in sync) by killing the
260:                    // backend thread
261:                    backendThread.getLoadBalancer().disableBackend(backend,
262:                            true);
263:                    String msg = "Request '"
264:                            + proc.getSqlShortForm(backend
265:                                    .getSqlShortFormLength())
266:                            + "' failed on backend " + backend.getName()
267:                            + " but " + getSuccess() + " succeeded (" + se
268:                            + ")";
269:                    logger.error(msg);
270:                    endUserLogger.error(Translate
271:                            .get("loadbalancer.backend.disabling", backend
272:                                    .getName()));
273:                    throw new SQLException(msg);
274:                }
275:
276:                // Sanity check
277:                if (c == null) { // Bad connection
278:                    SQLException se = new SQLException(
279:                            "Unable to retrieve connection for transaction "
280:                                    + tid);
281:                    try { // All backends failed, just ignore
282:                        if (!notifyFailure(backendThread,
283:                                proc.getTimeout() * 1000L, se))
284:                            return;
285:                    } catch (SQLException ignore) {
286:                    }
287:                    // Disable this backend (it is no more in sync) by killing the
288:                    // backend thread
289:                    backendThread.getLoadBalancer().disableBackend(backend,
290:                            true);
291:                    String msg = "Request '"
292:                            + proc.getSqlShortForm(backend
293:                                    .getSqlShortFormLength())
294:                            + "' failed on backend " + backend.getName()
295:                            + " but " + getSuccess() + " succeeded (" + se
296:                            + ")";
297:                    logger.error(msg);
298:                    endUserLogger.error(Translate
299:                            .get("loadbalancer.backend.disabling", backend
300:                                    .getName()));
301:                    throw new SQLException(msg);
302:                }
303:
304:                // Execute Query
305:                try {
306:                    result = AbstractLoadBalancer
307:                            .executeCallableStatementExecuteQueryOnBackend(
308:                                    proc, backend, backendThread, c,
309:                                    metadataCache);
310:
311:                    DatabaseProcedureSemantic semantic = proc.getSemantic();
312:                    if ((semantic == null) || semantic.hasDDLWrite())
313:                        backend.setSchemaIsDirty(true, proc);
314:                } catch (Exception e) {
315:                    try { // All backends failed, just ignore
316:                        if (!notifyFailure(backendThread,
317:                                proc.getTimeout() * 1000L, e)) {
318:                            result = null;
319:                            return;
320:                        }
321:                    } catch (SQLException ignore) {
322:                    }
323:                    // Disable this backend (it is no more in sync) by killing the backend
324:                    // thread
325:                    backendThread.getLoadBalancer().disableBackend(backend,
326:                            true);
327:                    String msg = "Stored procedure '"
328:                            + proc.getSqlShortForm(backend
329:                                    .getSqlShortFormLength())
330:                            + "' failed on backend " + backend.getName()
331:                            + " but " + getSuccess() + " succeeded (" + e + ")";
332:                    logger.error(msg);
333:                    endUserLogger.error(Translate
334:                            .get("loadbalancer.backend.disabling", backend
335:                                    .getName()));
336:                    throw new SQLException(msg);
337:                }
338:            }
339:
340:            /**
341:             * @see org.continuent.sequoia.controller.loadbalancer.tasks.AbstractTask#getRequest()
342:             */
343:            public AbstractRequest getRequest() {
344:                return proc;
345:            }
346:
347:            /**
348:             * Returns the result.
349:             * 
350:             * @return a <code>ResultSet</code>
351:             */
352:            public ControllerResultSet getResult() {
353:                return result;
354:            }
355:
356:            /**
357:             * @see org.continuent.sequoia.controller.loadbalancer.tasks.AbstractTask#getTransactionId()
358:             */
359:            public long getTransactionId() {
360:                return proc.getTransactionId();
361:            }
362:
363:            /**
364:             * @see org.continuent.sequoia.controller.loadbalancer.tasks.AbstractTask#isAutoCommit()
365:             */
366:            public boolean isAutoCommit() {
367:                return proc.isAutoCommit();
368:            }
369:
370:            /**
371:             * @see java.lang.Object#equals(java.lang.Object)
372:             */
373:            public boolean equals(Object other) {
374:                if ((other == null)
375:                        || !(other instanceof  CallableStatementExecuteQueryTask))
376:                    return false;
377:
378:                CallableStatementExecuteQueryTask cseqt = (CallableStatementExecuteQueryTask) other;
379:                if (proc == null)
380:                    return cseqt.getRequest() == null;
381:                return proc.equals(cseqt.getRequest());
382:            }
383:
384:            /**
385:             * @see java.lang.Object#hashCode()
386:             */
387:            public int hashCode() {
388:                return (int) proc.getId();
389:            }
390:
391:            /**
392:             * @see java.lang.Object#toString()
393:             */
394:            public String toString() {
395:                if (proc.isAutoCommit())
396:                    return "Autocommit CallableStatementExecuteQueryTask "
397:                            + proc.getTransactionId() + " ("
398:                            + proc.getUniqueKey() + ")";
399:                else
400:                    return "CallableStatementExecuteQueryTask for transaction "
401:                            + proc.getTransactionId() + " ("
402:                            + proc.getUniqueKey() + ")";
403:            }
404:
405:        }
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