Source Code Cross Referenced for Timer.java in  » JMX » mx4j » javax » management » timer » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » JMX » mx4j » javax.management.timer 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (C) The MX4J Contributors.
003:         * All rights reserved.
004:         *
005:         * This software is distributed under the terms of the MX4J License version 1.0.
006:         * See the terms of the MX4J License in the documentation provided with this software.
007:         */
008:
009:        package javax.management.timer;
010:
011:        import java.util.ArrayList;
012:        import java.util.Date;
013:        import java.util.HashMap;
014:        import java.util.Iterator;
015:        import java.util.Map;
016:        import java.util.Vector;
017:        import javax.management.InstanceNotFoundException;
018:        import javax.management.MBeanRegistration;
019:        import javax.management.MBeanServer;
020:        import javax.management.Notification;
021:        import javax.management.NotificationBroadcasterSupport;
022:        import javax.management.ObjectName;
023:
024:        import mx4j.log.Log;
025:        import mx4j.log.Logger;
026:        import mx4j.timer.TimeQueue;
027:        import mx4j.timer.TimerTask;
028:
029:        /**
030:         * @version $Revision: 1.19 $
031:         */
032:        public class Timer extends NotificationBroadcasterSupport implements 
033:                TimerMBean, MBeanRegistration {
034:            public static final long ONE_SECOND = 1000;
035:            public static final long ONE_MINUTE = 60 * ONE_SECOND;
036:            public static final long ONE_HOUR = 60 * ONE_MINUTE;
037:            public static final long ONE_DAY = 24 * ONE_HOUR;
038:            public static final long ONE_WEEK = 7 * ONE_DAY;
039:
040:            private TimeQueue queue = new TimeQueue();
041:            private boolean isActive;
042:            private int notificationID;
043:            private HashMap tasks = new HashMap();
044:            private boolean sendPastNotification;
045:            private ObjectName objectName;
046:
047:            private Logger getLogger() {
048:                return Log.getLogger(getClass().getName());
049:            }
050:
051:            public ObjectName preRegister(MBeanServer server, ObjectName name)
052:                    throws Exception {
053:                Logger logger = getLogger();
054:                objectName = name;
055:                if (logger.isEnabledFor(Logger.TRACE))
056:                    logger.trace("Timer service " + objectName
057:                            + " preRegistered successfully");
058:                return name;
059:            }
060:
061:            public void postRegister(Boolean registrationDone) {
062:                Logger logger = getLogger();
063:                boolean done = registrationDone.booleanValue();
064:                if (!done) {
065:                    logger.warn("Timer service " + objectName
066:                            + " was not registered");
067:                } else {
068:                    if (logger.isEnabledFor(Logger.TRACE))
069:                        logger.trace("Timer service " + objectName
070:                                + " postRegistered successfully.");
071:                }
072:            }
073:
074:            public void preDeregister() throws Exception {
075:                Logger logger = getLogger();
076:                stop();
077:                if (logger.isEnabledFor(Logger.TRACE))
078:                    logger.trace("Timer service " + objectName
079:                            + " preDeregistered successfully");
080:            }
081:
082:            public void postDeregister() {
083:                Logger logger = getLogger();
084:                if (logger.isEnabledFor(Logger.TRACE))
085:                    logger.trace("Timer service " + objectName
086:                            + " postDeregistered successfully");
087:            }
088:
089:            public void start() {
090:                if (!isActive()) {
091:                    Logger logger = getLogger();
092:                    if (logger.isEnabledFor(Logger.TRACE))
093:                        logger.trace("Starting Timer service " + objectName);
094:
095:                    queue.clear();
096:                    queue.start();
097:
098:                    ArrayList tasks = updateTasks();
099:                    scheduleTasks(tasks);
100:
101:                    isActive = true;
102:
103:                    if (logger.isEnabledFor(Logger.TRACE))
104:                        logger.trace("Timer service " + objectName
105:                                + " started successfully");
106:                }
107:            }
108:
109:            public void stop() {
110:                if (isActive()) {
111:                    Logger logger = getLogger();
112:                    if (logger.isEnabledFor(Logger.TRACE))
113:                        logger.trace("Stopping Timer service " + objectName);
114:
115:                    queue.stop();
116:                    queue.clear();
117:
118:                    isActive = false;
119:
120:                    if (logger.isEnabledFor(Logger.TRACE))
121:                        logger.trace("Timer service " + objectName
122:                                + " stopped successfully");
123:                }
124:            }
125:
126:            public boolean isActive() {
127:                return isActive;
128:            }
129:
130:            public Integer addNotification(String type, String message,
131:                    Object userData, Date date) throws IllegalArgumentException {
132:                return addNotification(type, message, userData, date, 0, 0,
133:                        false);
134:            }
135:
136:            public Integer addNotification(String type, String message,
137:                    Object userData, Date date, long period)
138:                    throws IllegalArgumentException {
139:                return addNotification(type, message, userData, date, period,
140:                        0, false);
141:            }
142:
143:            public Integer addNotification(String type, String message,
144:                    Object userData, Date date, long period, long occurrences)
145:                    throws IllegalArgumentException {
146:                return addNotification(type, message, userData, date, period,
147:                        occurrences, false);
148:            }
149:
150:            public Integer addNotification(String type, String message,
151:                    Object userData, Date date, long period, long occurrences,
152:                    boolean fixedRate) throws IllegalArgumentException {
153:                if (date == null)
154:                    throw new IllegalArgumentException(
155:                            "Notification date cannot be null");
156:                if (period < 0)
157:                    throw new IllegalArgumentException(
158:                            "Period cannot be negative");
159:                if (occurrences < 0)
160:                    throw new IllegalArgumentException(
161:                            "Occurrences cannot be negative");
162:
163:                long now = System.currentTimeMillis();
164:
165:                if (isActive()) {
166:                    // Check for the validity of the notification times, as the Timer is active
167:
168:                    // Notification in the past, assume it's now
169:                    if (date.getTime() < now)
170:                        date = new Date(now);
171:
172:                    // Periodic limited, the last notification is in the past
173:                    if (period > 0 && occurrences > 0) {
174:                        long lastTime = date.getTime() + (occurrences - 1)
175:                                * period;
176:                        if (lastTime < now)
177:                            throw new IllegalArgumentException(
178:                                    "Last date for periodic notification is before current date");
179:                    }
180:                }
181:
182:                // Anyway, register the notification, no matter if the Timer is active
183:                Integer id = addNotificationImpl(type, message, userData, date,
184:                        period, occurrences, fixedRate);
185:
186:                // If the Timer is active, schedule the notification
187:                if (isActive()) {
188:                    TimerTask task = getTask(id);
189:                    updateTask(task, now);
190:                    if (!task.isFinished()) {
191:                        queue.schedule(task);
192:                    }
193:                }
194:                return id;
195:            }
196:
197:            private Integer addNotificationImpl(String type, String message,
198:                    Object userData, Date date, long period, long occurrences,
199:                    boolean fixedRate) {
200:                Logger logger = getLogger();
201:
202:                Integer id = createNotificationID();
203:
204:                TimerNotification notification = new TimerNotification(type,
205:                        this , 0, System.currentTimeMillis(), message, id);
206:                notification.setUserData(userData);
207:                if (logger.isEnabledFor(Logger.DEBUG))
208:                    logger.debug("Adding timer notification: " + notification
209:                            + " on Timer service " + objectName);
210:
211:                TimerTask task = createTimerTask(notification, date, period,
212:                        occurrences, fixedRate);
213:
214:                synchronized (this ) {
215:                    tasks.put(id, task);
216:                }
217:
218:                return id;
219:            }
220:
221:            private TimerTask createTimerTask(TimerNotification notification,
222:                    Date date, long period, long occurrences, boolean fixedRate) {
223:                return new TimerTask(notification, date, period, occurrences,
224:                        fixedRate) {
225:                    public void run() {
226:                        // Send the notification
227:                        TimerNotification notification = getNotification();
228:                        TimerNotification toSend;
229:                        synchronized (notification) {
230:                            toSend = new TimerNotification(notification
231:                                    .getType(), notification.getSource(),
232:                                    notification.getSequenceNumber(),
233:                                    notification.getTimeStamp(), notification
234:                                            .getMessage(), notification
235:                                            .getNotificationID());
236:                            toSend.setUserData(notification.getUserData());
237:                            notification.setSequenceNumber(notification
238:                                    .getSequenceNumber() + 1);
239:                        }
240:                        sendNotification(toSend);
241:                    }
242:                };
243:            }
244:
245:            private ArrayList updateTasks() {
246:                ArrayList list = new ArrayList();
247:                boolean sendPast = getSendPastNotifications();
248:                long now = System.currentTimeMillis();
249:                synchronized (this ) {
250:                    for (Iterator i = tasks.entrySet().iterator(); i.hasNext();) {
251:                        Map.Entry entry = getNextNonFinishedTaskEntry(i);
252:                        if (entry == null)
253:                            break;
254:
255:                        TimerTask task = (TimerTask) entry.getValue();
256:
257:                        if (!sendPast) {
258:                            updateTask(task, now);
259:                            if (task.isFinished())
260:                                continue;
261:                        }
262:                        list.add(task);
263:                    }
264:                    return list;
265:                }
266:            }
267:
268:            private void updateTask(TimerTask task, long now) {
269:                long time = task.getNextExecutionTime();
270:
271:                while (time < now && !task.isFinished()) {
272:                    if (task.isPeriodic()) {
273:                        task.setNextExecutionTime(time + task.getPeriod());
274:                        time = task.getNextExecutionTime();
275:                    } else {
276:                        task.setFinished(true);
277:                    }
278:                }
279:            }
280:
281:            private void scheduleTasks(ArrayList tasks) {
282:                synchronized (this ) {
283:                    for (int i = 0; i < tasks.size(); ++i) {
284:                        TimerTask task = (TimerTask) tasks.get(i);
285:                        queue.schedule(task);
286:                    }
287:                }
288:            }
289:
290:            public void removeNotification(Integer id)
291:                    throws InstanceNotFoundException {
292:                Logger logger = getLogger();
293:
294:                synchronized (this ) {
295:                    TimerTask t = getTask(id);
296:                    if (t == null)
297:                        throw new InstanceNotFoundException(
298:                                "Cannot find notification to remove with id: "
299:                                        + id);
300:                    queue.unschedule(t);
301:                    tasks.remove(id);
302:                    if (logger.isEnabledFor(Logger.DEBUG))
303:                        logger.debug("Notification " + t.getNotification()
304:                                + " removed successfully from Timer service "
305:                                + objectName);
306:                }
307:            }
308:
309:            public void removeNotifications(String type)
310:                    throws InstanceNotFoundException {
311:                Logger logger = getLogger();
312:
313:                boolean found = false;
314:                synchronized (this ) {
315:                    for (Iterator i = tasks.entrySet().iterator(); i.hasNext();) {
316:                        Map.Entry entry = getNextNonFinishedTaskEntry(i);
317:                        if (entry == null)
318:                            break;
319:
320:                        TimerTask t = (TimerTask) entry.getValue();
321:                        TimerNotification n = t.getNotification();
322:                        if (n.getType().equals(type)) {
323:                            queue.unschedule(t);
324:                            i.remove();
325:                            if (logger.isEnabledFor(Logger.DEBUG))
326:                                logger
327:                                        .debug("Notification "
328:                                                + n
329:                                                + " removed successfully from Timer service "
330:                                                + objectName);
331:                            found = true;
332:                        }
333:                    }
334:                }
335:
336:                if (!found)
337:                    throw new InstanceNotFoundException(
338:                            "Cannot find timer notification to remove with type: "
339:                                    + type + " from Timer service "
340:                                    + objectName);
341:            }
342:
343:            public void removeAllNotifications() {
344:                synchronized (this ) {
345:                    queue.clear();
346:                    tasks.clear();
347:                    notificationID = 0;
348:                }
349:            }
350:
351:            public Vector getAllNotificationIDs() {
352:                Vector vector = new Vector();
353:                synchronized (this ) {
354:                    for (Iterator i = tasks.entrySet().iterator(); i.hasNext();) {
355:                        Map.Entry entry = getNextNonFinishedTaskEntry(i);
356:                        if (entry == null)
357:                            break;
358:                        vector.add(entry.getKey());
359:                    }
360:                }
361:                return vector;
362:            }
363:
364:            public Vector getNotificationIDs(String type) {
365:                Vector vector = new Vector();
366:                synchronized (this ) {
367:                    for (Iterator i = tasks.entrySet().iterator(); i.hasNext();) {
368:                        Map.Entry entry = getNextNonFinishedTaskEntry(i);
369:                        if (entry == null)
370:                            break;
371:                        TimerTask t = (TimerTask) entry.getValue();
372:                        TimerNotification n = t.getNotification();
373:                        if (n.getType().equals(type)) {
374:                            vector.add(entry.getKey());
375:                        }
376:                    }
377:                }
378:                return vector;
379:            }
380:
381:            public boolean getSendPastNotifications() {
382:                return sendPastNotification;
383:            }
384:
385:            public void setSendPastNotifications(boolean value) {
386:                sendPastNotification = value;
387:            }
388:
389:            public int getNbNotifications() {
390:                int count = 0;
391:                synchronized (this ) {
392:                    for (Iterator i = tasks.entrySet().iterator(); i.hasNext();) {
393:                        Map.Entry entry = getNextNonFinishedTaskEntry(i);
394:                        if (entry == null)
395:                            break;
396:                        ++count;
397:                    }
398:                    return count;
399:                }
400:            }
401:
402:            public boolean isEmpty() {
403:                synchronized (this ) {
404:                    return getNbNotifications() == 0;
405:                }
406:            }
407:
408:            public String getNotificationType(Integer id) {
409:                synchronized (this ) {
410:                    TimerTask t = getTask(id);
411:                    return t == null ? null : t.getNotification().getType();
412:                }
413:            }
414:
415:            public String getNotificationMessage(Integer id) {
416:                synchronized (this ) {
417:                    TimerTask t = getTask(id);
418:                    return t == null ? null : t.getNotification().getMessage();
419:                }
420:            }
421:
422:            public Object getNotificationUserData(Integer id) {
423:                synchronized (this ) {
424:                    TimerTask t = getTask(id);
425:                    return t == null ? null : t.getNotification().getUserData();
426:                }
427:            }
428:
429:            public Date getDate(Integer id) {
430:                synchronized (this ) {
431:                    TimerTask t = getTask(id);
432:                    return t == null ? null : new Date(t.getDate());
433:                }
434:            }
435:
436:            public Long getPeriod(Integer id) {
437:                synchronized (this ) {
438:                    TimerTask t = getTask(id);
439:                    return t == null ? null : new Long(t.getPeriod());
440:                }
441:            }
442:
443:            public Long getNbOccurences(Integer id) {
444:                synchronized (this ) {
445:                    TimerTask t = getTask(id);
446:                    return t == null ? null : new Long(t.getOccurrences());
447:                }
448:            }
449:
450:            private Integer createNotificationID() {
451:                synchronized (this ) {
452:                    return new Integer(++notificationID);
453:                }
454:            }
455:
456:            private TimerTask getTask(Integer id) {
457:                Logger logger = getLogger();
458:
459:                synchronized (this ) {
460:                    TimerTask t = (TimerTask) tasks.get(id);
461:
462:                    if (logger.isEnabledFor(Logger.DEBUG))
463:                        logger
464:                                .debug("Retrieving task with id " + id + ": "
465:                                        + t);
466:
467:                    if (t != null && t.isFinished()) {
468:                        if (logger.isEnabledFor(Logger.DEBUG))
469:                            logger.debug("Task with id " + id
470:                                    + " is expired, removing it");
471:
472:                        tasks.remove(id);
473:                        t = null;
474:                    }
475:                    return t;
476:                }
477:            }
478:
479:            private Map.Entry getNextNonFinishedTaskEntry(Iterator i) {
480:                Logger logger = getLogger();
481:
482:                synchronized (this ) {
483:                    if (i.hasNext()) {
484:                        Map.Entry entry = (Map.Entry) i.next();
485:                        TimerTask t = (TimerTask) entry.getValue();
486:                        if (t.isFinished()) {
487:                            if (logger.isEnabledFor(Logger.DEBUG))
488:                                logger
489:                                        .debug("Found an expired notification, removing it: "
490:                                                + t);
491:                            i.remove();
492:                            return getNextNonFinishedTaskEntry(i);
493:                        }
494:                        return entry;
495:                    }
496:                    return null;
497:                }
498:            }
499:
500:            public void sendNotification(Notification n) {
501:                Logger logger = getLogger();
502:                if (logger.isEnabledFor(Logger.TRACE))
503:                    logger
504:                            .trace("Start sending notifications from Timer service "
505:                                    + objectName);
506:                super .sendNotification(n);
507:                if (logger.isEnabledFor(Logger.TRACE))
508:                    logger
509:                            .trace("Finished sending notifications from Timer service "
510:                                    + objectName);
511:            }
512:
513:            public Boolean getFixedRate(Integer id) {
514:                return new Boolean(getTask(id).getFixedRate());
515:            }
516:        }
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