Source Code Cross Referenced for RequestFactory.java in  » Database-JDBC-Connection-Pool » sequoia-2.10.9 » org » continuent » sequoia » controller » requests » 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.requests 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**
002:         * Sequoia: Database clustering technology.
003:         * Copyright (C) 2005 AmicoSoft, Inc. dba Emic Networks
004:         * Contact: sequoia@continuent.org
005:         * 
006:         * Licensed under the Apache License, Version 2.0 (the "License");
007:         * you may not use this file except in compliance with the License.
008:         * You may obtain a copy of the License at
009:         * 
010:         * http://www.apache.org/licenses/LICENSE-2.0
011:         * 
012:         * Unless required by applicable law or agreed to in writing, software
013:         * distributed under the License is distributed on an "AS IS" BASIS,
014:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015:         * See the License for the specific language governing permissions and
016:         * limitations under the License. 
017:         *
018:         * Initial developer(s): Emmanuel Cecchet.
019:         * Contributor(s): ______________________.
020:         */package org.continuent.sequoia.controller.requests;
021:
022:        import java.sql.Connection;
023:
024:        /**
025:         * This class defines a RequestFactory.<br>
026:         * Given a SQL query, it creates a full request of the correct type. These
027:         * request types are defined by the implementing classes, as well as the regular
028:         * expressions to be used for the SQL query parsing
029:         * 
030:         * @author <a href="mailto:emmanuel.cecchet@emicnetworks.com">Emmanuel Cecchet</a>
031:         * @author <a href="mailto:gilles.rayrat@continuent.com">Gilles Rayrat</a>
032:         * @version 2.0
033:         */
034:        public abstract class RequestFactory {
035:            /** Reqular expressions to be used for request parsing */
036:            private RequestRegExp driverRegExp = null;
037:
038:            /**
039:             * Sets the custom regular expressions
040:             * 
041:             * @param regexp regular expression to be used for request parsing
042:             */
043:            protected RequestFactory(RequestRegExp regexp) {
044:                driverRegExp = regexp;
045:            }
046:
047:            /**
048:             * Parses the given string:
049:             * <ul>
050:             * <li>if a read query is identified, creates and returns the appropriate
051:             * read request
052:             * <li>else if a write query is identified, creates and returns an unknown
053:             * write request
054:             * <li>else returns null
055:             * </ul>
056:             * 
057:             * @param sqlQuery sql statement to parse
058:             * @param escapeProcessing query parameter to set
059:             * @param timeout query parameter to set
060:             * @param lineSeparator query parameter to set
061:             * @return a <code>SelectRequest</code>, an <code>UnknownReadRequest</code>,
062:             *         an <code>UnknownWriteRequest</code> or <code>null</code>
063:             */
064:            protected AbstractRequest decodeReadRequestFromString(
065:                    String sqlQuery, boolean escapeProcessing, int timeout,
066:                    String lineSeparator) {
067:                AbstractRequest decodedRequest = null;
068:                if (driverRegExp.getSelectRequestPattern().matcher(sqlQuery)
069:                        .matches()) {
070:                    decodedRequest = getSelectRequest(sqlQuery,
071:                            escapeProcessing, timeout, lineSeparator);
072:                    if (driverRegExp.getSelectForUpdatePattern().matcher(
073:                            sqlQuery).matches())
074:                        ((SelectRequest) decodedRequest).setMustBroadcast(true);
075:                }
076:                if (driverRegExp.getUnknownWriteRequestPattern().matcher(
077:                        sqlQuery).matches()) {
078:                    decodedRequest = getUnknownWriteRequest(sqlQuery,
079:                            escapeProcessing, timeout, lineSeparator);
080:                } else if (driverRegExp.getUnknownReadRequestPattern().matcher(
081:                        sqlQuery).matches()) {
082:                    decodedRequest = getUnknownReadRequest(sqlQuery,
083:                            escapeProcessing, timeout, lineSeparator);
084:                    if (driverRegExp.getSelectForUpdatePattern().matcher(
085:                            sqlQuery).matches())
086:                        ((SelectRequest) decodedRequest).setMustBroadcast(true);
087:                }
088:                return decodedRequest;
089:            }
090:
091:            /**
092:             * Parses the given string and creates/returns the appropriate write request,
093:             * stored procedure or <code>null</code> if no write query was identified
094:             * 
095:             * @param sqlQuery sql statement to parse
096:             * @param escapeProcessing query parameter to set
097:             * @param timeout query parameter to set
098:             * @param lineSeparator query parameter to set
099:             * @return an <code>InsertRequest</code>, an <code>UpdateRequest</code>,
100:             *         a <code>DeleteRequest</code>, a <code>CreateRequest</code>, a
101:             *         <code>DropRequest</code>, an <code>AlterRequest</code>, a
102:             *         <code>StoredProcedure</code> or <code>null</code>
103:             */
104:            protected AbstractRequest decodeWriteRequestFromString(
105:                    String sqlQuery, boolean escapeProcessing, int timeout,
106:                    String lineSeparator) {
107:                AbstractRequest decodedRequest = null;
108:                if (driverRegExp.getInsertQueryPattern().matcher(sqlQuery)
109:                        .matches()) {
110:                    decodedRequest = getInsertRequest(sqlQuery,
111:                            escapeProcessing, timeout, lineSeparator);
112:                } else if (driverRegExp.getUpdateRequestPattern().matcher(
113:                        sqlQuery).matches()) {
114:                    decodedRequest = getUpdateRequest(sqlQuery,
115:                            escapeProcessing, timeout, lineSeparator);
116:                } else if (driverRegExp.getDeleteRequestPattern().matcher(
117:                        sqlQuery).matches()) {
118:                    decodedRequest = getDeleteRequest(sqlQuery,
119:                            escapeProcessing, timeout, lineSeparator);
120:                } else if (driverRegExp.getCreateRequestPattern().matcher(
121:                        sqlQuery).matches()) {
122:                    decodedRequest = getCreateRequest(sqlQuery,
123:                            escapeProcessing, timeout, lineSeparator);
124:                } else if (driverRegExp.getDropRequestPattern().matcher(
125:                        sqlQuery).matches()) {
126:                    decodedRequest = getDropRequest(sqlQuery, escapeProcessing,
127:                            timeout, lineSeparator);
128:                } else if (driverRegExp.getAlterRequestPattern().matcher(
129:                        sqlQuery).matches()) {
130:                    decodedRequest = getAlterRequest(sqlQuery,
131:                            escapeProcessing, timeout, lineSeparator);
132:                } else if (driverRegExp.getStoredProcedurePattern().matcher(
133:                        sqlQuery).matches()) {
134:                    decodedRequest = getStoredProcedure(sqlQuery,
135:                            escapeProcessing, timeout, lineSeparator);
136:                }
137:                return decodedRequest;
138:            }
139:
140:            /**
141:             * Given a sql statement string, creates the appropriate read or write
142:             * request, or <code>null</code> if no sql query could be identified.
143:             * Priority of the parsing and the parameters of the request to be created are
144:             * configurable tries to identify read or write first)
145:             * 
146:             * @param sqlQuery sql statement to parse
147:             * @param isProbablyAReadRequest set to true if the given sql query is
148:             *          probably a read statement. This will give priority to the parsing
149:             *          of read requests
150:             * @param escapeProcessing query parameter to set
151:             * @param timeout query parameter to set
152:             * @param lineSeparator query parameter to set
153:             * @return an <code>InsertRequest</code>, an <code>UpdateRequest</code>,
154:             *         a <code>DeleteRequest</code>, a <code>CreateRequest</code>, a
155:             *         <code>DropRequest</code>, an <code>AlterRequest</code>, a
156:             *         <code>StoredProcedure</code>, a <code>SelectRequest</code>,
157:             *         an <code>UnknownReadRequest</code>, an
158:             *         <code>UnknownWriteRequest</code> or <code>null</code>
159:             */
160:            public AbstractRequest requestFromString(String sqlQuery,
161:                    boolean isProbablyAReadRequest, boolean escapeProcessing,
162:                    int timeout, String lineSeparator) {
163:                AbstractRequest decodedRequest = null;
164:                if (isProbablyAReadRequest) {
165:                    // more probably a read, let's try it first
166:                    decodedRequest = decodeReadRequestFromString(sqlQuery,
167:                            escapeProcessing, timeout, lineSeparator);
168:                }
169:                if (decodedRequest == null
170:                        || decodedRequest instanceof  UnknownWriteRequest) {
171:                    // either isProbablyAReadRequest == false or decodeRead found an unknown
172:                    // write
173:                    decodedRequest = decodeWriteRequestFromString(sqlQuery,
174:                            escapeProcessing, timeout, lineSeparator);
175:                }
176:                if (decodedRequest == null && !isProbablyAReadRequest) {
177:                    // decodeWrite didn't find anything, let's try decodeRead
178:                    decodedRequest = decodeReadRequestFromString(sqlQuery,
179:                            escapeProcessing, timeout, lineSeparator);
180:                } else if (decodedRequest == null) {
181:                    // nothing found, safer to say that it is an unknown read
182:                    decodedRequest = getUnknownReadRequest(sqlQuery,
183:                            escapeProcessing, timeout, lineSeparator);
184:                }
185:                return decodedRequest;
186:            }
187:
188:            /**
189:             * Returns true if the query has to be executed with statement.execute() or if
190:             * it contains an inline batch such as "SELECT xxx ; INSERT xxx ; DROP xxx ;
191:             * ..."
192:             * 
193:             * @param request the request to check
194:             * @return true if the request has to be executed with statement.execute() or
195:             *         contains an inline batch
196:             */
197:            public boolean requestNeedsExecute(AbstractRequest request) {
198:                // Check if the request match the StatementExecuteRequest pattern
199:                if (driverRegExp.getStatementExecuteRequestPattern().matcher(
200:                        request.getSqlOrTemplate()).matches())
201:                    return true;
202:
203:                // Otherwise, check if the query contains an inline batch such as "SELECT
204:                // xxx ; INSERT xxx ; DROP xxx ; ..."
205:                String sql = request.getSqlOrTemplate();
206:                int semiColonIdx = sql.indexOf(';');
207:
208:                // Test for no semicolon
209:                if (semiColonIdx == -1)
210:                    return false;
211:
212:                // Test for multiple semicolons
213:                // TODO: Check that semicolon does not belong to a parameter
214:                if (sql.indexOf(';', semiColonIdx + 1) != -1)
215:                    return true;
216:
217:                // Single semicolon, check that this was not just appended at the end of a
218:                // single query
219:                if (sql.trim().endsWith(";"))
220:                    return false; // query ends by semicolon
221:                else
222:                    return true;
223:            }
224:
225:            /**
226:             * Check whether the given sql is authorized to execute on the cluster or not.
227:             * 
228:             * @param sql the SQL statement to check
229:             * @return false if the statement is not authorized and must be blocked, true
230:             *         otherwise
231:             */
232:            public boolean isAuthorizedRequest(String sql) {
233:                return !driverRegExp.getUnauthorizedRequestsPattern().matcher(
234:                        sql).matches();
235:            }
236:
237:            /**
238:             * 
239:             * Determines whether or not a select statement should be broadcast
240:             * based on the setting of the transaction isolation level. By
241:             * default request at transaction isolation level serializable are
242:             * broadcast.
243:             * 
244:             * @param transactionIsolationLevel the transaction isolation level
245:             *    for the current request.
246:             *    
247:             * @return true if the select should be broadcast.
248:             */
249:            public boolean isBroadcastRequired(int transactionIsolationLevel) {
250:                return transactionIsolationLevel == Connection.TRANSACTION_SERIALIZABLE;
251:            }
252:
253:            /**
254:             * @see AlterRequest#AlterRequest(String, boolean, int, String)
255:             */
256:            protected abstract AlterRequest getAlterRequest(String sqlQuery,
257:                    boolean escapeProcessing, int timeout, String lineSeparator);
258:
259:            /**
260:             * @see CreateRequest#CreateRequest(String, boolean, int, String)
261:             */
262:            protected abstract CreateRequest getCreateRequest(String sqlQuery,
263:                    boolean escapeProcessing, int timeout, String lineSeparator);
264:
265:            /**
266:             * @see DeleteRequest#DeleteRequest(String, boolean, int, String)
267:             */
268:            protected abstract DeleteRequest getDeleteRequest(String sqlQuery,
269:                    boolean escapeProcessing, int timeout, String lineSeparator);
270:
271:            /**
272:             * @see DropRequest#DropRequest(String, boolean, int, String)
273:             */
274:            protected abstract DropRequest getDropRequest(String sqlQuery,
275:                    boolean escapeProcessing, int timeout, String lineSeparator);
276:
277:            /**
278:             * @see InsertRequest#InsertRequest(String, boolean, int, String)
279:             */
280:            protected abstract InsertRequest getInsertRequest(String sqlQuery,
281:                    boolean escapeProcessing, int timeout, String lineSeparator);
282:
283:            /**
284:             * @see SelectRequest#SelectRequest(String, boolean, int, String)
285:             */
286:            protected abstract SelectRequest getSelectRequest(String sqlQuery,
287:                    boolean escapeProcessing, int timeout, String lineSeparator);
288:
289:            /**
290:             * @see StoredProcedure#StoredProcedure(String, boolean, int, String)
291:             */
292:            protected abstract StoredProcedure getStoredProcedure(
293:                    String sqlQuery, boolean escapeProcessing, int timeout,
294:                    String lineSeparator);
295:
296:            /**
297:             * @see UnknownReadRequest#UnknownReadRequest(String, boolean, int, String)
298:             */
299:            protected abstract UnknownReadRequest getUnknownReadRequest(
300:                    String sqlQuery, boolean escapeProcessing, int timeout,
301:                    String lineSeparator);
302:
303:            /**
304:             * @see UnknownWriteRequest#UnknownWriteRequest(String, boolean, int, String)
305:             */
306:            protected abstract UnknownWriteRequest getUnknownWriteRequest(
307:                    String sqlQuery, boolean escapeProcessing, int timeout,
308:                    String lineSeparator);
309:
310:            /**
311:             * @see UpdateRequest#UpdateRequest(String, boolean, int, String)
312:             */
313:            protected abstract UpdateRequest getUpdateRequest(String sqlQuery,
314:                    boolean escapeProcessing, int timeout, String lineSeparator);
315:        }
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