Source Code Cross Referenced for Servlet.java in  » Database-DBMS » hsql » org » hsqldb » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » hsql » org.hsqldb 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Copyright (c) 1995-2000, The Hypersonic SQL Group.
002:         * All rights reserved.
003:         *
004:         * Redistribution and use in source and binary forms, with or without
005:         * modification, are permitted provided that the following conditions are met:
006:         *
007:         * Redistributions of source code must retain the above copyright notice, this
008:         * list of conditions and the following disclaimer.
009:         *
010:         * Redistributions in binary form must reproduce the above copyright notice,
011:         * this list of conditions and the following disclaimer in the documentation
012:         * and/or other materials provided with the distribution.
013:         *
014:         * Neither the name of the Hypersonic SQL Group nor the names of its
015:         * contributors may be used to endorse or promote products derived from this
016:         * software without specific prior written permission.
017:         *
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
020:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
021:         * ARE DISCLAIMED. IN NO EVENT SHALL THE HYPERSONIC SQL GROUP,
022:         * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
023:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
024:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025:         * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
026:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028:         * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029:         *
030:         * This software consists of voluntary contributions made by many individuals 
031:         * on behalf of the Hypersonic SQL Group.
032:         *
033:         *
034:         * For work added by the HSQL Development Group:
035:         *
036:         * Copyright (c) 2001-2005, The HSQL Development Group
037:         * All rights reserved.
038:         *
039:         * Redistribution and use in source and binary forms, with or without
040:         * modification, are permitted provided that the following conditions are met:
041:         *
042:         * Redistributions of source code must retain the above copyright notice, this
043:         * list of conditions and the following disclaimer.
044:         *
045:         * Redistributions in binary form must reproduce the above copyright notice,
046:         * this list of conditions and the following disclaimer in the documentation
047:         * and/or other materials provided with the distribution.
048:         *
049:         * Neither the name of the HSQL Development Group nor the names of its
050:         * contributors may be used to endorse or promote products derived from this
051:         * software without specific prior written permission.
052:         *
053:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
054:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
055:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
056:         * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
057:         * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
058:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
059:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
060:         * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
061:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
062:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
063:         * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
064:         */
065:
066:        package org.hsqldb;
067:
068:        import java.io.DataInputStream;
069:        import java.io.IOException;
070:        import java.io.PrintWriter;
071:
072:        import javax.servlet.ServletConfig;
073:        import javax.servlet.ServletException;
074:        import javax.servlet.ServletOutputStream;
075:        import javax.servlet.http.HttpServletRequest;
076:        import javax.servlet.http.HttpServletResponse;
077:
078:        import org.hsqldb.persist.HsqlProperties;
079:        import org.hsqldb.rowio.RowInputBinary;
080:        import org.hsqldb.rowio.RowOutputBinary;
081:
082:        // fredt@users 20020130 - patch 475586 by wreissen@users
083:        // fredt@users 20020328 - patch 1.7.0 by fredt - error trapping
084:        // fredt@users 20030630 - patch 1.7.2 - new protocol, persistent sessions
085:        // fredt@users 20041112 - patch by Willian Crick - use web_inf directory
086:
087:        /**
088:         * Servlet can act as an interface between the client and the database for the
089:         * the client / server mode of HSQL Database Engine. It uses the HTTP protocol
090:         * for communication. This class is not required if the included HSQLDB
091:         * Weberver is used on the server host. But if the host is running a J2EE
092:         * application server or a servlet container such as Tomcat, the Servlet class
093:         * can be hosted on this server / container to serve external requests from
094:         * external hosts.<p>
095:         * The remote applet / application should
096:         * use the normal JDBC interfaces to connect to the URL of this servlet. An
097:         * example URL is:
098:         * <pre>
099:         * jdbc:hsqldb:http://localhost.com:8080/servlet/org.hsqldb.Servlet
100:         * </pre>
101:         * The database path/name is taken from the servlet engine property:
102:         * <pre>
103:         * hsqldb.server.database
104:         * </pre>
105:         * <p>
106:         * If the database is deployed in the WEB-INF directory of the servlet container,
107:         * the property:
108:         * <pre>
109:         *  hsqldb.server.use_web-inf_path
110:         * </pre>
111:         * should be set "true" in the web.xml file of the servlet container.
112:         * In this case, the database path should not begin with a "/".
113:         *
114:         * From version 1.7.2 JDBC connections via the HTTP protocol are persistent
115:         * in the JDBC sense. The JDBC Connection that is established can support
116:         * transactions spanning several Statement calls and real PreparedStatement
117:         * calls are supported. This class has been rewritten to support the new
118:         * features.<p>
119:         * (fredt@users)<p>
120:         *
121:         * Extensively rewritten for HSQLDB.
122:         *
123:         * @author Thomas Mueller (Hypersonic SQL Group)
124:         * @version 1.7.2
125:         * @since Hypersonic SQL
126:         */
127:        public class Servlet extends javax.servlet.http.HttpServlet {
128:
129:            private static final int BUFFER_SIZE = 256;
130:            private String dbType;
131:            private String dbPath;
132:            private String errorStr;
133:            private RowOutputBinary rowOut;
134:            private RowInputBinary rowIn;
135:            private int iQueries;
136:
137:            /**
138:             * Method declaration
139:             *
140:             *
141:             * @param config
142:             */
143:            public void init(ServletConfig config) {
144:
145:                try {
146:                    super .init(config);
147:
148:                    rowOut = new RowOutputBinary(BUFFER_SIZE);
149:                    rowIn = new RowInputBinary(rowOut);
150:                } catch (ServletException e) {
151:                    log(e.toString());
152:                }
153:
154:                String dbStr = getInitParameter("hsqldb.server.database");
155:
156:                if (dbStr == null) {
157:                    dbStr = ".";
158:                }
159:
160:                // begin WEB-INF patch */
161:                String useWebInfStr = getInitParameter("hsqldb.server.use_web-inf_path");
162:
163:                if (!dbStr.equals(".") && "true".equalsIgnoreCase(useWebInfStr)) {
164:                    dbStr = getServletContext().getRealPath("/") + "WEB-INF"
165:                            + dbStr;
166:                }
167:
168:                // end WEB-INF patch
169:                HsqlProperties dbURL = DatabaseURL.parseURL(dbStr, false);
170:
171:                log("Database filename = " + dbStr);
172:
173:                if (dbURL == null) {
174:                    errorStr = "Bad Database name";
175:                } else {
176:                    dbPath = dbURL.getProperty("database");
177:                    dbType = dbURL.getProperty("connection_type");
178:
179:                    try {
180:
181:                        // loosecannon1@users 1.7.2 patch properties on the JDBC URL
182:                        DatabaseManager.getDatabase(dbType, dbPath, dbURL);
183:                    } catch (HsqlException e) {
184:                        errorStr = e.getMessage();
185:                    }
186:                }
187:
188:                log(errorStr);
189:                log("Initialization completed.");
190:            }
191:
192:            private static long lModified = 0;
193:
194:            /**
195:             * Method declaration
196:             *
197:             *
198:             * @param req
199:             *
200:             * @return
201:             */
202:            protected long getLastModified(HttpServletRequest req) {
203:
204:                // this is made so that the cache of the http server is not used
205:                // maybe there is some other way
206:                return lModified++;
207:            }
208:
209:            /**
210:             * Method declaration
211:             *
212:             *
213:             * @param request
214:             * @param response
215:             *
216:             * @throws IOException
217:             * @throws ServletException
218:             */
219:            public void doGet(HttpServletRequest request,
220:                    HttpServletResponse response) throws IOException,
221:                    ServletException {
222:
223:                String query = request.getQueryString();
224:
225:                if ((query == null) || (query.length() == 0)) {
226:                    response.setContentType("text/html");
227:
228:                    // fredt@users 20020130 - patch 1.7.0 by fredt
229:                    // to avoid caching on the browser
230:                    response.setHeader("Pragma", "no-cache");
231:
232:                    PrintWriter out = response.getWriter();
233:
234:                    out
235:                            .println("<html><head><title>HSQL Database Engine Servlet</title>");
236:                    out
237:                            .println("</head><body><h1>HSQL Database Engine Servlet</h1>");
238:                    out.println("The servlet is running.<p>");
239:
240:                    if (errorStr == null) {
241:                        out.println("The database is also running.<p>");
242:                        out
243:                                .println("Database name: " + dbType + dbPath
244:                                        + "<p>");
245:                        out.println("Queries processed: " + iQueries + "<p>");
246:                    } else {
247:                        out.println("<h2>The database is not running!</h2>");
248:                        out.println("The error message is:<p>");
249:                        out.println(errorStr);
250:                    }
251:
252:                    out.println("</body></html>");
253:                }
254:            }
255:
256:            /**
257:             * Method declaration
258:             *
259:             *
260:             * @param request
261:             * @param response
262:             *
263:             * @throws IOException
264:             * @throws ServletException
265:             */
266:            public void doPost(HttpServletRequest request,
267:                    HttpServletResponse response) throws IOException,
268:                    ServletException {
269:
270:                synchronized (this ) {
271:                    DataInputStream inStream = null;
272:                    ServletOutputStream outStream = null;
273:
274:                    try {
275:
276:                        // fredt@users - the servlet container, Resin does not return all
277:                        // the bytes with one call to input.read(b,0,len) when len > 8192
278:                        // bytes, the loop in the Result.read() method handles this
279:                        inStream = new DataInputStream(request.getInputStream());
280:
281:                        Result resultIn = Result.read(rowIn, inStream);
282:                        Result resultOut;
283:
284:                        if (resultIn.mode == ResultConstants.SQLCONNECT) {
285:                            try {
286:                                Session session = DatabaseManager.newSession(
287:                                        dbType, dbPath, resultIn
288:                                                .getMainString(), resultIn
289:                                                .getSubString(), null);
290:
291:                                resultOut = new Result(
292:                                        ResultConstants.UPDATECOUNT);
293:                                resultOut.sessionID = session.getId();
294:                            } catch (HsqlException e) {
295:                                resultOut = new Result(e, null);
296:                            }
297:                        } else {
298:                            int dbId = resultIn.databaseID;
299:                            int sessionId = resultIn.sessionID;
300:                            Session session = DatabaseManager.getSession(dbId,
301:                                    sessionId);
302:
303:                            resultOut = session.execute(resultIn);
304:                        }
305:
306:                        rowOut.reset();
307:                        resultOut.write(rowOut);
308:
309:                        //
310:                        response.setContentType("application/octet-stream");
311:                        response.setContentLength(rowOut.size());
312:
313:                        //
314:                        outStream = response.getOutputStream();
315:
316:                        outStream.write(rowOut.getOutputStream().getBuffer(),
317:                                0, rowOut.getOutputStream().size());
318:
319:                        iQueries++;
320:                    } catch (HsqlException e) {
321:                    } finally {
322:                        if (outStream != null) {
323:                            outStream.close();
324:                        }
325:
326:                        if (inStream != null) {
327:                            inStream.close();
328:                        }
329:                    }
330:                }
331:
332:                // Trace.printSystemOut("Queries processed: "+iQueries+"  \n");
333:            }
334:        }
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