Source Code Cross Referenced for ServerConfigParser.java in  » Web-Server » Quadcap-Web-Server » com » quadcap » server » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » Quadcap Web Server » com.quadcap.server 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package com.quadcap.server;
002:
003:        /* Copyright 2000 - 2003 Quadcap Software.  All rights reserved.
004:         *
005:         * This software is distributed under the Quadcap Free Software License.
006:         * This software may be used or modified for any purpose, personal or
007:         * commercial.  Open Source redistributions are permitted.  Commercial
008:         * redistribution of larger works derived from, or works which bundle
009:         * this software requires a "Commercial Redistribution License"; see
010:         * http://www.quadcap.com/purchase.
011:         *
012:         * Redistributions qualify as "Open Source" under  one of the following terms:
013:         *   
014:         *    Redistributions are made at no charge beyond the reasonable cost of
015:         *    materials and delivery.
016:         *
017:         *    Redistributions are accompanied by a copy of the Source Code or by an
018:         *    irrevocable offer to provide a copy of the Source Code for up to three
019:         *    years at the cost of materials and delivery.  Such redistributions
020:         *    must allow further use, modification, and redistribution of the Source
021:         *    Code under substantially the same terms as this license.
022:         *
023:         * Redistributions of source code must retain the copyright notices as they
024:         * appear in each source code file, these license terms, and the
025:         * disclaimer/limitation of liability set forth as paragraph 6 below.
026:         *
027:         * Redistributions in binary form must reproduce this Copyright Notice,
028:         * these license terms, and the disclaimer/limitation of liability set
029:         * forth as paragraph 6 below, in the documentation and/or other materials
030:         * provided with the distribution.
031:         *
032:         * The Software is provided on an "AS IS" basis.  No warranty is
033:         * provided that the Software is free of defects, or fit for a
034:         * particular purpose.  
035:         *
036:         * Limitation of Liability. Quadcap Software shall not be liable
037:         * for any damages suffered by the Licensee or any third party resulting
038:         * from use of the Software.
039:         */
040:
041:        import java.io.BufferedInputStream;
042:        import java.io.BufferedReader;
043:        import java.io.FileInputStream;
044:        import java.io.FileReader;
045:        import java.io.IOException;
046:
047:        import java.util.ArrayList;
048:        import java.util.Collections;
049:        import java.util.Comparator;
050:        import java.util.HashMap;
051:        import java.util.Properties;
052:
053:        import org.xml.sax.AttributeList;
054:        import org.xml.sax.DocumentHandler;
055:        import org.xml.sax.ErrorHandler;
056:        import org.xml.sax.InputSource;
057:        import org.xml.sax.Parser;
058:        import org.xml.sax.Locator;
059:        import org.xml.sax.SAXException;
060:        import org.xml.sax.SAXParseException;
061:
062:        import org.xml.sax.helpers.ParserFactory;
063:
064:        import com.quadcap.util.ConfigString;
065:        import com.quadcap.util.Debug;
066:
067:        /*{com.quadcap.server.ServerConfigParser.xml}
068:         *
069:         * <el><name>server</name>
070:         *     <p>This document is used to configure and initialize QED services.</p>
071:         *
072:         *     <el><name>service</name>
073:         *         <p>Each service definition has the following allowed elements.</p>
074:         *
075:         *         <el><name>service-name</name>
076:         *             <p>The name of the service.</p>
077:         *         </el>
078:         *
079:         *         <el><name>service-class</name>
080:         *             <p>The name of the Java class which implements the service.</p>
081:         *         </el>
082:         *
083:         *         <el><name>service-config</name>
084:         *             <p>The name of a service configuration file.</p>
085:         *         </el>
086:         *
087:         *         <el><name>load-on-startup</name>
088:         *             <p>An integer value used to control the order in which
089:         *                services are loaded.  Lower values are started first.</p>
090:         *         </el>
091:         *
092:         *         <el><name>init-parameter</name>
093:         *             <p>String-valued configuration parameters may be supplied to
094:         *                a service.</p>
095:         *
096:         *             <el><name>param-name</name>
097:         *                 <p>The initialization/configuration parameter name.</p>
098:         *             </el>
099:         *
100:         *             <el><name>param-value</name>
101:         *                 <p>The initialization/configuration parameter value.</p>
102:         *             </el>
103:         *         </el>
104:         *     </el>
105:         * </el>
106:         */
107:
108:        /**
109:         * Parser the <code>server.xml</code> file to determine which services
110:         * should be loaded on startup.
111:         *
112:         * @author Stan Bailes
113:         */
114:        public class ServerConfigParser implements  DocumentHandler,
115:                ErrorHandler {
116:            ServiceContainer container;
117:            Parser parser;
118:            Locator locator;
119:            StringBuffer data = new StringBuffer();
120:            ArrayList services = new ArrayList();
121:            ServiceWrapper service = null;
122:            Properties props = null;
123:            String paramName = null;
124:            String paramValue = null;
125:
126:            static final int INIT = 0;
127:            static final int SERVER = 1;
128:            static final int SERVICE = 2;
129:            static final int SERVICE_NAME = 3;
130:            static final int SERVICE_CLASS = 4;
131:            static final int SERVICE_CONFIG = 5;
132:            static final int LOAD_ON_STARTUP = 6;
133:            static final int INIT_PARAMETER = 7;
134:            static final int PARAM_NAME = 8;
135:            static final int PARAM_VALUE = 9;
136:
137:            static HashMap elemMap = new HashMap();
138:            static {
139:                elemMap.put("server", new Integer(SERVER));
140:                elemMap.put("service", new Integer(SERVICE));
141:                elemMap.put("service-name", new Integer(SERVICE_NAME));
142:                elemMap.put("service-class", new Integer(SERVICE_CLASS));
143:                elemMap.put("service-config", new Integer(SERVICE_CONFIG));
144:                elemMap.put("load-on-startup", new Integer(LOAD_ON_STARTUP));
145:                elemMap.put("init-parameter", new Integer(INIT_PARAMETER));
146:                elemMap.put("param-name", new Integer(PARAM_NAME));
147:                elemMap.put("param-value", new Integer(PARAM_VALUE));
148:            }
149:
150:            static final int mapElement(String name) {
151:                Integer i = (Integer) elemMap.get(name);
152:                if (i == null)
153:                    return -1;
154:                return i.intValue();
155:            }
156:
157:            /**
158:             * No-argument constructor.  The new object needs a database connection
159:             * before it can do anything useful.
160:             *
161:             * @exception Exception may be thrown if there's a problem constructing
162:             * 	the XML parser.
163:             */
164:            public ServerConfigParser(ServiceContainer c) throws Exception {
165:                this .container = c;
166:                ConfigString ps = ConfigString.find("xml.sax.parser",
167:                        "com.quadcap.text.sax.Parser");
168:
169:                try {
170:                    ClassLoader cl = ClassLoader.getSystemClassLoader();
171:                    this .parser = (Parser) (Class.forName(ps.toString(), true,
172:                            cl).newInstance());
173:                } catch (Throwable t) {
174:                    Debug.print(t);
175:                }
176:                parser.setDocumentHandler(this );
177:                parser.setErrorHandler(this );
178:            }
179:
180:            /**
181:             * Parse the specified file
182:             *
183:             * @exception may be thrown
184:             */
185:            public void parse(String fileName) throws Exception {
186:                FileReader f = new FileReader(fileName);
187:                try {
188:                    BufferedReader r = new BufferedReader(f);
189:                    InputSource is = new InputSource(r);
190:                    parser.parse(is);
191:                } finally {
192:                    f.close();
193:                }
194:            }
195:
196:            /**
197:             * SAX parser callback to handle XML Parser errors.
198:             * This implementation just prints them
199:             * to System.err.
200:             *
201:             * @param exception the exception generated by the parser.
202:             */
203:            public void error(SAXParseException exception) {
204:                System.err.println("error");
205:                exception.printStackTrace(System.err);
206:            }
207:
208:            /**
209:             * SAX parser callback to handle XML Parser fatal errors.
210:             * This implementation just prints them
211:             * to System.err.
212:             *
213:             * @param exception the exception generated by the parser.
214:             */
215:            public void fatalError(SAXParseException exception) {
216:                System.err.println("fatal error");
217:                exception.printStackTrace(System.err);
218:            }
219:
220:            /**
221:             * SAX parser callback to handle XML Parser fatal errors.  
222:             * This implementation just prints them
223:             * to System.err.
224:             *
225:             * @param exception the exception generated by the parser.
226:             */
227:            public void warning(SAXParseException exception) {
228:                System.err.println("warning");
229:                exception.printStackTrace(System.err);
230:            }
231:
232:            /**
233:             * SAX parser callback to handle character data found in the 
234:             * parsed document.
235:             *
236:             * @param ch the buffer containing the parsed characters.
237:             * @param star the buffer position of the first character
238:             * @param length the number of characters
239:             *
240:             * @exception SAXException may be thrown if this data represents
241:             *		a database value and there's a SQL exception thrown while
242:             *		trying to update the underlying resultset object with this
243:             *		data.
244:             */
245:            public void characters(char[] ch, int start, int length)
246:                    throws SAXException {
247:                data.append(ch, start, length);
248:            }
249:
250:            /**
251:             * SAX parser callback function that is called when the end of the 
252:             * document is reached.  This implementation does nothing.
253:             */
254:            public void endDocument() {
255:            }
256:
257:            /**
258:             * SAX parser callback function called for the end of an element. 
259:             * If this element
260:             * represents the <code>&lt;database&gt;</code> element, we finish up
261:             * by closing the active statement.  If this element represents a table
262:             * row element, we insert the current row.  Otherwise, we do nothing.
263:             *
264:             * @param name the name of this element
265:             * @exception SAXException may be thrown to wrap any underlying database
266:             *	exception.
267:             */
268:            public void endElement(String name) throws SAXException {
269:                switch (mapElement(name)) {
270:                case SERVER:
271:                    addServices();
272:                    break;
273:                case SERVICE:
274:                    if (props != null) {
275:                        service.setServiceProperties(props);
276:                        props = null;
277:                    }
278:                    services.add(service);
279:                    break;
280:                case SERVICE_NAME:
281:                    service.setServiceName(consume());
282:                    break;
283:                case SERVICE_CLASS:
284:                    service.setServiceClass(consume());
285:                    break;
286:                case LOAD_ON_STARTUP:
287:                    service.setLoadOnStartup(Integer.parseInt(consume()));
288:                    break;
289:                case SERVICE_CONFIG: {
290:                    String cname = consume();
291:                    getProps().setProperty("service.config", cname);
292:                    try {
293:                        getProps().putAll(parseProps(cname));
294:                    } catch (IOException ex) {
295:                    }
296:                }
297:                    break;
298:                case PARAM_NAME:
299:                    paramName = consume();
300:                    break;
301:                case PARAM_VALUE:
302:                    paramValue = consume();
303:                    break;
304:                case INIT_PARAMETER:
305:                    if (paramName != null && paramValue != null) {
306:                        getProps().put(paramName, paramValue);
307:                        paramName = null;
308:                        paramValue = null;
309:                    }
310:                    break;
311:                default:
312:                    throw new SAXException("endElement: bad element: " + name);
313:                }
314:            }
315:
316:            final private Properties getProps() {
317:                if (props == null)
318:                    props = new Properties();
319:                return props;
320:            }
321:
322:            final public static Properties parseProps(String fileName)
323:                    throws IOException {
324:                FileInputStream f = new FileInputStream(fileName);
325:                Properties p = new Properties();
326:                try {
327:                    BufferedInputStream b = new BufferedInputStream(f);
328:                    p.load(b);
329:                } finally {
330:                    f.close();
331:                }
332:                return p;
333:            }
334:
335:            /**
336:             * SAX parser callback for ignorable whitespace.  We just ignore it
337:             *
338:             * @param ch the buffer containing the parsed characters.
339:             * @param star the buffer position of the first character
340:             * @param length the number of characters
341:             */
342:            public void ignorableWhitespace(char[] ch, int start, int length) {
343:            }
344:
345:            /**
346:             * SAX parser callback for processing instructions.  This implementation
347:             * does nothing.
348:             *
349:             * @param target the processing instruction target.
350:             * @param data the processing instruction data.
351:             */
352:            public void processingInstruction(String target, String data) {
353:            }
354:
355:            /**
356:             * SAX parser callback used to receive a document locator.
357:             *
358:             * @param locator the parser's locator object.
359:             */
360:            public void setDocumentLocator(Locator locator) {
361:                this .locator = locator;
362:            }
363:
364:            /**
365:             * SAX parser callback for document start.
366:             * This implementation does nothing.
367:             */
368:            public void startDocument() {
369:            }
370:
371:            /**
372:             * SAX parser callback for the start of an element.  If this element
373:             * represents a table row, and the table is different from the last
374:             * table seen, we establish an updatable <code>ResultSet</code> for the
375:             * new table which can be used to insert new rows into the table.
376:             * If this element represents a table row, we move to the insert row.
377:             * If this element represents a column, we remember the column name.
378:             *
379:             * @param name the element name
380:             * @param attrs the element's attributes
381:             *
382:             * @exception SAXException may be thrown to wrap an underlying database
383:             * 		error, or if there is a problem with the XML document itself.
384:             */
385:            public void startElement(String name, AttributeList attrs)
386:                    throws SAXException {
387:                data.setLength(0);
388:                switch (mapElement(name)) {
389:                case SERVICE:
390:                    service = new ServiceWrapper();
391:                    break;
392:                default:
393:                    break;
394:                case -1:
395:                    throw new SAXException("Unrecognized element: " + name);
396:                }
397:            }
398:
399:            /**
400:             * Get and return all of the accumulated character data as a String.
401:             * Reset the character data buffer to be empty.
402:             */
403:            final String consume() {
404:                String s = data.toString().trim();
405:                data.setLength(0);
406:                return s;
407:            }
408:
409:            /**
410:             * At the end of the file, add the services in the specified order
411:             */
412:            final void addServices() throws SAXException {
413:                Exception ex = null;
414:
415:                Collections.sort(services, new Comparator() {
416:                    public int compare(Object a, Object b) {
417:                        ServiceWrapper wa = (ServiceWrapper) a;
418:                        ServiceWrapper wb = (ServiceWrapper) b;
419:                        if (wa.getLoadOnStartup() < wb.getLoadOnStartup())
420:                            return -1;
421:                        if (wa.getLoadOnStartup() > wb.getLoadOnStartup())
422:                            return 1;
423:                        return 0;
424:                    }
425:                });
426:                for (int i = 0; i < services.size(); i++) {
427:                    ServiceWrapper w = (ServiceWrapper) services.get(i);
428:                    try {
429:                        container.addService(w.getServiceName(), w
430:                                .getServiceClass(), w.getServiceProperties());
431:                    } catch (Exception e) {
432:                        ex = e;
433:                        Debug.print(e);
434:                    }
435:                }
436:
437:                if (ex != null)
438:                    throw new SAXException(ex);
439:            }
440:        }
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