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


001:        /**
002:         * Sequoia: Database clustering technology.
003:         * Copyright (C) 2005 Continuent, Inc.
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.common.sql;
021:
022:        import java.io.IOException;
023:
024:        import org.continuent.sequoia.common.stream.DriverBufferedInputStream;
025:        import org.continuent.sequoia.common.stream.DriverBufferedOutputStream;
026:        import org.continuent.sequoia.driver.Connection;
027:
028:        /**
029:         * This class defines a Request object. This basically carries the SQL statement
030:         * and the SQL template if this is a PreparedStatement.
031:         * 
032:         * @author <a href="mailto:emmanuel.cecchet@continuent.com">Emmanuel Cecchet</a>
033:         * @version 1.0
034:         */
035:        public class Request {
036:            /**
037:             * SQL query if this is a statement (should be set in constructor) or query
038:             * template if this is a PreparedStatement.
039:             */
040:            private String sqlQueryOrTemplate;
041:
042:            /**
043:             * PreparedStatement parameters
044:             */
045:            private String preparedStatementParameters = null;
046:
047:            //
048:            // Connection related parameters
049:            //
050:
051:            /** True if the connection has been set to read-only */
052:            private boolean isReadOnly = false;
053:
054:            /**
055:             * Whether this request has been sent in <code>autocommit</code> mode or
056:             * not.
057:             */
058:            private boolean isAutoCommit = true;
059:
060:            /**
061:             * Transaction isolation level to use when executing the query inside a
062:             * transaction. The value is set by the VirtualDatabaseWorkerThread.
063:             */
064:            private int transactionIsolation;
065:
066:            /**
067:             * Timeout for this request in seconds, value 0 means no timeout (should be
068:             * set in constructor). This timeout is in seconds, reflecting the jdbc-spec,
069:             * and is passed as-is to the backends jdbc-driver. Internally converted to ms
070:             * via getTimeoutMs().
071:             */
072:            private int timeoutInSeconds;
073:
074:            /**
075:             * Should the backend driver do escape processing before sending to the
076:             * database? Simply forwarded to backend driver. No setter for this member,
077:             * should be set in constructor.
078:             * 
079:             * @see java.sql.Statement#setEscapeProcessing(boolean)
080:             */
081:            private boolean escapeProcessing = true;
082:
083:            /**
084:             * Request identifier only used for failover purposes. This id is sent back by
085:             * the controller.
086:             */
087:            private long id;
088:
089:            //
090:            // Constructors
091:            //
092:
093:            /**
094:             * Creates a new <code>Request</code> object
095:             * 
096:             * @param sqlTemplate the SQL template (using ? as parameter placeholders) or
097:             *          null
098:             * @param parameters the prepared statement parameters
099:             * @param escapeProcessing Should the backend driver do escape processing
100:             *          before sending to the database?
101:             * @param timeoutInSeconds Timeout for this request in seconds, value 0 means
102:             *          no timeout
103:             */
104:            public Request(String sqlTemplate, String parameters,
105:                    boolean escapeProcessing, int timeoutInSeconds) {
106:                this .sqlQueryOrTemplate = sqlTemplate;
107:                this .preparedStatementParameters = parameters;
108:                this .escapeProcessing = escapeProcessing;
109:                this .timeoutInSeconds = timeoutInSeconds;
110:            }
111:
112:            //
113:            // Serialization
114:            //
115:
116:            /**
117:             * Creates a new <code>Request</code> object, deserializing it from an input
118:             * stream. Has to mirror the serialization method below.
119:             * 
120:             * @param in the input stream to read from
121:             * @throws IOException if a network error occurs
122:             */
123:
124:            public Request(DriverBufferedInputStream in) throws IOException {
125:                this .sqlQueryOrTemplate = in.readLongUTF();
126:                this .escapeProcessing = in.readBoolean();
127:                this .timeoutInSeconds = in.readInt();
128:
129:                this .isAutoCommit = in.readBoolean();
130:
131:                // Does this request has a template with question marks "?"
132:                // true for PreparedStatements
133:                // (AND did we ask for them at connection time?)
134:                if (in.readBoolean())
135:                    this .preparedStatementParameters = in.readLongUTF();
136:
137:                // success, we received it all
138:            }
139:
140:            /**
141:             * Serialize the request on the output stream by sending only the needed
142:             * parameters to reconstruct it on the controller. Has to mirror the
143:             * deserialization method above.
144:             * 
145:             * @param out destination DriverBufferedOutputStream
146:             * @throws IOException if fails
147:             */
148:
149:            public void sendToStream(DriverBufferedOutputStream out)
150:                    throws IOException {
151:                out.writeLongUTF(sqlQueryOrTemplate);
152:                out.writeBoolean(escapeProcessing);
153:                out.writeInt(timeoutInSeconds);
154:
155:                out.writeBoolean(isAutoCommit);
156:
157:                // Send the "un-"PreparedStatement if the controller wants it:
158:                // - either for better parsing
159:                // - or to process it
160:                // - && this is a PreparedStatement (of course)
161:                if (preparedStatementParameters != null) {
162:                    out.writeBoolean(true);
163:                    out.writeLongUTF(preparedStatementParameters);
164:                } else
165:                    out.writeBoolean(false);
166:            }
167:
168:            //
169:            // Getters/Setters
170:            //
171:
172:            /**
173:             * Returns the escapeProcessing value.
174:             * 
175:             * @return Returns the escapeProcessing.
176:             */
177:            public final boolean isEscapeProcessing() {
178:                return escapeProcessing;
179:            }
180:
181:            /**
182:             * Sets the escapeProcessing value.
183:             * 
184:             * @param escapeProcessing The escapeProcessing to set.
185:             */
186:            public final void setEscapeProcessing(boolean escapeProcessing) {
187:                this .escapeProcessing = escapeProcessing;
188:            }
189:
190:            /**
191:             * Returns the isAutoCommit value.
192:             * 
193:             * @return Returns the isAutoCommit.
194:             */
195:            public final boolean isAutoCommit() {
196:                return isAutoCommit;
197:            }
198:
199:            /**
200:             * Sets the isAutoCommit value.
201:             * 
202:             * @param isAutoCommit The isAutoCommit to set.
203:             */
204:            public final void setIsAutoCommit(boolean isAutoCommit) {
205:                this .isAutoCommit = isAutoCommit;
206:            }
207:
208:            /**
209:             * Returns the isReadOnly value.
210:             * 
211:             * @return Returns the isReadOnly.
212:             */
213:            public final boolean isReadOnly() {
214:                return isReadOnly;
215:            }
216:
217:            /**
218:             * Sets the isReadOnly value.
219:             * 
220:             * @param isReadOnly The isReadOnly to set.
221:             */
222:            public final void setIsReadOnly(boolean isReadOnly) {
223:                this .isReadOnly = isReadOnly;
224:            }
225:
226:            /**
227:             * Returns the id value.
228:             * 
229:             * @return Returns the id.
230:             */
231:            public long getId() {
232:                return id;
233:            }
234:
235:            /**
236:             * Sets the id value.
237:             * 
238:             * @param id The id to set.
239:             */
240:            public void setId(long id) {
241:                this .id = id;
242:            }
243:
244:            /**
245:             * Returns the sqlQuery value.
246:             * 
247:             * @return Returns the sqlQuery.
248:             */
249:            public final String getSqlQueryOrTemplate() {
250:                return sqlQueryOrTemplate;
251:            }
252:
253:            /**
254:             * Get a short form of this request if the SQL statement exceeds
255:             * nbOfCharacters.
256:             * 
257:             * @param nbOfCharacters number of characters to include in the short form.
258:             * @return the nbOfCharacters first characters of the SQL statement
259:             */
260:            public String getSqlShortForm(int nbOfCharacters) {
261:                if ((nbOfCharacters == 0)
262:                        || (sqlQueryOrTemplate.length() < nbOfCharacters))
263:                    return sqlQueryOrTemplate;
264:                else
265:                    return sqlQueryOrTemplate.substring(0, nbOfCharacters)
266:                            + "...";
267:            }
268:
269:            /**
270:             * Returns the sqlTemplate value.
271:             * 
272:             * @return Returns the sqlTemplate.
273:             */
274:            public final String getPreparedStatementParameters() {
275:                return preparedStatementParameters;
276:            }
277:
278:            /**
279:             * Returns the timeoutInSeconds value.
280:             * 
281:             * @return Returns the timeoutInSeconds.
282:             */
283:            public final int getTimeoutInSeconds() {
284:                return timeoutInSeconds;
285:            }
286:
287:            /**
288:             * Sets the timeoutInSeconds value.
289:             * 
290:             * @param timeoutInSeconds The timeoutInSeconds to set.
291:             */
292:            public final void setTimeoutInSeconds(int timeoutInSeconds) {
293:                this .timeoutInSeconds = timeoutInSeconds;
294:            }
295:
296:            /**
297:             * Returns the transactionIsolation value.
298:             * 
299:             * @return Returns the transactionIsolation.
300:             */
301:            public final int getTransactionIsolation() {
302:                return transactionIsolation;
303:            }
304:
305:            /**
306:             * Sets the transactionIsolation value.
307:             * 
308:             * @param transactionIsolation The transactionIsolation to set.
309:             */
310:            public final void setTransactionIsolation(int transactionIsolation) {
311:                this.transactionIsolation = transactionIsolation;
312:            }
313:        }
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