Source Code Cross Referenced for MemoryUserDatabase.java in  » Web-Framework » struts-1.3.8 » org » apache » struts » webapp » example2 » memory » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » struts 1.3.8 » org.apache.struts.webapp.example2.memory 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: MemoryUserDatabase.java 471754 2006-11-06 14:55:09Z husted $
003:         *
004:         * Licensed to the Apache Software Foundation (ASF) under one
005:         * or more contributor license agreements.  See the NOTICE file
006:         * distributed with this work for additional information
007:         * regarding copyright ownership.  The ASF licenses this file
008:         * to you under the Apache License, Version 2.0 (the
009:         * "License"); you may not use this file except in compliance
010:         * with the License.  You may obtain a copy of the License at
011:         *
012:         *  http://www.apache.org/licenses/LICENSE-2.0
013:         *
014:         * Unless required by applicable law or agreed to in writing,
015:         * software distributed under the License is distributed on an
016:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017:         * KIND, either express or implied.  See the License for the
018:         * specific language governing permissions and limitations
019:         * under the License.
020:         */
021:
022:        package org.apache.struts.webapp.example2.memory;
023:
024:        import java.io.BufferedInputStream;
025:        import java.io.File;
026:        import java.io.FileInputStream;
027:        import java.io.FileOutputStream;
028:        import java.io.IOException;
029:        import java.io.OutputStreamWriter;
030:        import java.io.PrintWriter;
031:        import java.util.HashMap;
032:        import org.apache.commons.digester.Digester;
033:        import org.apache.commons.digester.ObjectCreationFactory;
034:        import org.apache.commons.logging.Log;
035:        import org.apache.commons.logging.LogFactory;
036:        import org.apache.struts.webapp.example2.Subscription;
037:        import org.apache.struts.webapp.example2.User;
038:        import org.apache.struts.webapp.example2.UserDatabase;
039:        import org.xml.sax.Attributes;
040:
041:        /**
042:         * <p>Concrete implementation of {@link UserDatabase} for an in-memory
043:         * database backed by an XML data file.</p>
044:         *
045:         * @author Craig R. McClanahan
046:         * @version $Rev: 471754 $ $Date: 2006-11-06 08:55:09 -0600 (Mon, 06 Nov 2006) $
047:         * @since Struts 1.1
048:         */
049:
050:        public final class MemoryUserDatabase implements  UserDatabase {
051:
052:            // ----------------------------------------------------------- Constructors
053:
054:            // ----------------------------------------------------- Instance Variables
055:
056:            /**
057:             * Logging output for this user database instance.
058:             */
059:            private Log log = LogFactory.getLog(this .getClass());
060:
061:            /**
062:             * The {@link User}s associated with this UserDatabase, keyed by username.
063:             */
064:            private HashMap users = new HashMap();
065:
066:            // ------------------------------------------------------------- Properties
067:
068:            /**
069:             * Absolute pathname to the persistent file we use for loading and storing
070:             * persistent data.
071:             */
072:            private String pathname = null;
073:
074:            private String pathnameOld = null;
075:
076:            private String pathnameNew = null;
077:
078:            public String getPathname() {
079:                return (this .pathname);
080:            }
081:
082:            public void setPathname(String pathname) {
083:                this .pathname = pathname;
084:                pathnameOld = pathname + ".old";
085:                pathnameNew = pathname + ".new";
086:            }
087:
088:            // --------------------------------------------------------- Public Methods
089:
090:            /**
091:             * <p>Finalize access to the underlying persistence layer.</p>
092:             *
093:             * @exception Exception if a database access error occurs
094:             */
095:            public void close() throws Exception {
096:
097:                save();
098:
099:            }
100:
101:            /**
102:             * <p>Create and return a new {@link User} defined in this user database.
103:             * </p>
104:             *
105:             * @param username Username of the new user
106:             *
107:             * @exception IllegalArgumentExceptionif the specified username
108:             *  is not unique
109:             */
110:            public User createUser(String username) {
111:
112:                synchronized (users) {
113:                    if (users.get(username) != null) {
114:                        throw new IllegalArgumentException("Duplicate user '"
115:                                + username + "'");
116:                    }
117:                    if (log.isTraceEnabled()) {
118:                        log.trace("Creating user '" + username + "'");
119:                    }
120:                    MemoryUser user = new MemoryUser(this , username);
121:                    synchronized (users) {
122:                        users.put(username, user);
123:                    }
124:                    return (user);
125:                }
126:
127:            }
128:
129:            /**
130:             * <p>Return the existing {@link User} with the specified username,
131:             * if any; otherwise return <code>null</code>.</p>
132:             *
133:             * @param username Username of the user to retrieve
134:             */
135:            public User findUser(String username) {
136:
137:                synchronized (users) {
138:                    return ((User) users.get(username));
139:                }
140:
141:            }
142:
143:            /**
144:             * <p>Return the set of {@link User}s defined in this user database.</p>
145:             */
146:            public User[] findUsers() {
147:
148:                synchronized (users) {
149:                    User results[] = new User[users.size()];
150:                    return ((User[]) users.values().toArray(results));
151:                }
152:
153:            }
154:
155:            /**
156:             * <p>Initiate access to the underlying persistence layer.</p>
157:             *
158:             * @exception Exception if a database access error occurs
159:             */
160:            public void open() throws Exception {
161:
162:                FileInputStream fis = null;
163:                BufferedInputStream bis = null;
164:
165:                try {
166:
167:                    // Acquire an input stream to our database file
168:                    if (log.isDebugEnabled()) {
169:                        log.debug("Loading database from '" + pathname + "'");
170:                    }
171:                    fis = new FileInputStream(pathname);
172:                    bis = new BufferedInputStream(fis);
173:
174:                    // Construct a digester to use for parsing
175:                    Digester digester = new Digester();
176:                    digester.push(this );
177:                    digester.setValidating(false);
178:                    digester.addFactoryCreate("database/user",
179:                            new MemoryUserCreationFactory(this ));
180:                    digester.addFactoryCreate("database/user/subscription",
181:                            new MemorySubscriptionCreationFactory(this ));
182:
183:                    // Parse the input stream to initialize our database
184:                    digester.parse(bis);
185:                    bis.close();
186:                    bis = null;
187:                    fis = null;
188:
189:                } catch (Exception e) {
190:
191:                    log.error("Loading database from '" + pathname + "':", e);
192:                    throw e;
193:
194:                } finally {
195:
196:                    if (bis != null) {
197:                        try {
198:                            bis.close();
199:                        } catch (Throwable t) {
200:                            ;
201:                        }
202:                        bis = null;
203:                        fis = null;
204:                    }
205:
206:                }
207:
208:            }
209:
210:            /**
211:             * Remove the specified {@link User} from this database.
212:             *
213:             * @param user User to be removed
214:             *
215:             * @exception IllegalArgumentException if the specified user is not
216:             *  associated with this database
217:             */
218:            public void removeUser(User user) {
219:
220:                if (!(this  == user.getDatabase())) {
221:                    throw new IllegalArgumentException(
222:                            "User not associated with this database");
223:                }
224:                if (log.isTraceEnabled()) {
225:                    log.trace("Removing user '" + user.getUsername() + "'");
226:                }
227:                synchronized (users) {
228:                    users.remove(user.getUsername());
229:                }
230:
231:            }
232:
233:            /**
234:             * <p>Save any pending changes to the underlying persistence layer.</p>
235:             *
236:             * @exception Exception if a database access error occurs
237:             */
238:            public void save() throws Exception {
239:
240:                if (log.isDebugEnabled()) {
241:                    log.debug("Saving database to '" + pathname + "'");
242:                }
243:                File fileNew = new File(pathnameNew);
244:                PrintWriter writer = null;
245:
246:                try {
247:
248:                    // Configure our PrintWriter
249:                    FileOutputStream fos = new FileOutputStream(fileNew);
250:                    OutputStreamWriter osw = new OutputStreamWriter(fos);
251:                    writer = new PrintWriter(osw);
252:
253:                    // Print the file prolog
254:                    writer.println("<?xml version='1.0'?>");
255:                    writer.println("<database>");
256:
257:                    // Print entries for each defined user and associated subscriptions
258:                    User users[] = findUsers();
259:                    for (int i = 0; i < users.length; i++) {
260:                        writer.print("  ");
261:                        writer.println(users[i]);
262:                        Subscription subscriptions[] = users[i]
263:                                .getSubscriptions();
264:                        for (int j = 0; j < subscriptions.length; j++) {
265:                            writer.print("    ");
266:                            writer.println(subscriptions[j]);
267:                            writer.print("    ");
268:                            writer.println("</subscription>");
269:                        }
270:                        writer.print("  ");
271:                        writer.println("</user>");
272:                    }
273:
274:                    // Print the file epilog
275:                    writer.println("</database>");
276:
277:                    // Check for errors that occurred while printing
278:                    if (writer.checkError()) {
279:                        writer.close();
280:                        fileNew.delete();
281:                        throw new IOException("Saving database to '" + pathname
282:                                + "'");
283:                    }
284:                    writer.close();
285:                    writer = null;
286:
287:                } catch (IOException e) {
288:
289:                    if (writer != null) {
290:                        writer.close();
291:                    }
292:                    fileNew.delete();
293:                    throw e;
294:
295:                }
296:
297:                // Perform the required renames to permanently save this file
298:                File fileOrig = new File(pathname);
299:                File fileOld = new File(pathnameOld);
300:                if (fileOrig.exists()) {
301:                    fileOld.delete();
302:                    if (!fileOrig.renameTo(fileOld)) {
303:                        throw new IOException("Renaming '" + pathname
304:                                + "' to '" + pathnameOld + "'");
305:                    }
306:                }
307:                if (!fileNew.renameTo(fileOrig)) {
308:                    if (fileOld.exists()) {
309:                        fileOld.renameTo(fileOrig);
310:                    }
311:                    throw new IOException("Renaming '" + pathnameNew + "' to '"
312:                            + pathname + "'");
313:                }
314:                fileOld.delete();
315:
316:            }
317:
318:        }
319:
320:        /**
321:         * Digester object creation factory for subscription instances.
322:         */
323:        class MemorySubscriptionCreationFactory implements 
324:                ObjectCreationFactory {
325:
326:            public MemorySubscriptionCreationFactory(MemoryUserDatabase database) {
327:            }
328:
329:            private Digester digester = null;
330:
331:            public Digester getDigester() {
332:                return (this .digester);
333:            }
334:
335:            public void setDigester(Digester digester) {
336:                this .digester = digester;
337:            }
338:
339:            public Object createObject(Attributes attributes) {
340:                String host = attributes.getValue("host");
341:                User user = (User) digester.peek();
342:                Subscription subscription = user.createSubscription(host);
343:                String autoConnect = attributes.getValue("autoConnect");
344:                if (autoConnect == null) {
345:                    autoConnect = "false";
346:                }
347:                if ("true".equalsIgnoreCase(autoConnect)
348:                        || "yes".equalsIgnoreCase(autoConnect)) {
349:                    subscription.setAutoConnect(true);
350:                } else {
351:                    subscription.setAutoConnect(false);
352:                }
353:                subscription.setPassword(attributes.getValue("password"));
354:                subscription.setType(attributes.getValue("type"));
355:                subscription.setUsername(attributes.getValue("username"));
356:                return (subscription);
357:            }
358:
359:        }
360:
361:        /**
362:         * Digester object creation factory for user instances.
363:         */
364:        class MemoryUserCreationFactory implements  ObjectCreationFactory {
365:
366:            public MemoryUserCreationFactory(MemoryUserDatabase database) {
367:                this .database = database;
368:            }
369:
370:            private MemoryUserDatabase database = null;
371:
372:            private Digester digester = null;
373:
374:            public Digester getDigester() {
375:                return (this .digester);
376:            }
377:
378:            public void setDigester(Digester digester) {
379:                this .digester = digester;
380:            }
381:
382:            public Object createObject(Attributes attributes) {
383:                String username = attributes.getValue("username");
384:                User user = database.createUser(username);
385:                user.setFromAddress(attributes.getValue("fromAddress"));
386:                user.setFullName(attributes.getValue("fullName"));
387:                user.setPassword(attributes.getValue("password"));
388:                user.setReplyToAddress(attributes.getValue("replyToAddress"));
389:                return (user);
390:            }
391:
392:        }
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