Source Code Cross Referenced for AlarmTable.java in  » EJB-Server-JBoss-4.2.1 » varia » org » jboss » monitor » alarm » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server JBoss 4.2.1 » varia » org.jboss.monitor.alarm 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * JBoss, Home of Professional Open Source.
003:         * Copyright 2006, Red Hat Middleware LLC, and individual contributors
004:         * as indicated by the @author tags. See the copyright.txt file in the
005:         * distribution for a full listing of individual contributors.
006:         *
007:         * This is free software; you can redistribute it and/or modify it
008:         * under the terms of the GNU Lesser General Public License as
009:         * published by the Free Software Foundation; either version 2.1 of
010:         * the License, or (at your option) any later version.
011:         *
012:         * This software is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015:         * Lesser General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU Lesser General Public
018:         * License along with this software; if not, write to the Free
019:         * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
021:         */
022:        package org.jboss.monitor.alarm;
023:
024:        import java.util.Collection;
025:        import java.util.HashMap;
026:        import java.util.LinkedHashMap;
027:        import java.util.Map;
028:
029:        import javax.management.Notification;
030:        import javax.management.ObjectName;
031:
032:        import org.jboss.system.ServiceMBeanSupport;
033:
034:        import EDU.oswego.cs.dl.util.concurrent.SynchronizedLong;
035:
036:        /**
037:         * AlarmTable
038:         *
039:         * @author  <a href="mailto:dimitris@jboss.org">Dimitris Andreadis</a>
040:         * @version $Revision: 57210 $
041:         */
042:        public class AlarmTable {
043:            // Private/Protected Data ----------------------------------------
044:
045:            /** Mediates the related MBean */
046:            protected MBeanImplAccess mbeanImpl;
047:
048:            /** The serverId to use when producing AlarmTableNotification alarmIds */
049:            private String serverId;
050:
051:            /** Counter the help produce unique ids: serverId-alarmIdCount */
052:            private SynchronizedLong alarmIdCount;
053:
054:            /** The active alarm table, maps AlarmId(String) -> AlarmTableNotification */
055:            private Map alarmMap;
056:
057:            /** Maps AlarmKey -> AlarmId(String), for stateful alarms */
058:            private Map statefulMap;
059:
060:            /** Maximum number of entries to keep */
061:            private int maxSize = -1;
062:
063:            // Constructors --------------------------------------------------
064:
065:            /**
066:             * CTOR
067:             */
068:            public AlarmTable(MBeanImplAccess mbeanImpl) {
069:                this .mbeanImpl = mbeanImpl;
070:                this .alarmIdCount = new SynchronizedLong(0);
071:                this .alarmMap = new LinkedHashMap();
072:                this .statefulMap = new HashMap();
073:            }
074:
075:            /**
076:             * CTOR
077:             * 
078:             * @param service hosting the AlarmManager
079:             */
080:            public AlarmTable(final ServiceMBeanSupport service) {
081:                this (new MBeanImplAccess() {
082:                    public ObjectName getMBeanName() {
083:                        return service.getServiceName();
084:                    }
085:
086:                    public long getSequenceNumber() {
087:                        return service.nextNotificationSequenceNumber();
088:                    }
089:
090:                    public void emitNotification(Notification n) {
091:                        service.sendNotification(n);
092:                    }
093:                });
094:            }
095:
096:            // AlarmTable Implementation -------------------------------------
097:
098:            /**
099:             * Sets the serverId
100:             */
101:            public void setServerId(String serverId) {
102:                this .serverId = serverId;
103:            }
104:
105:            /**
106:             * Gets the serverId
107:             */
108:            public String getServerId() {
109:                return serverId;
110:            }
111:
112:            /**
113:             * Sets the maximum number of entries to keep
114:             * -1 equals to no limit.
115:             */
116:            public void setMaxSize(int maxSize) {
117:                this .maxSize = maxSize;
118:            }
119:
120:            /**
121:             * Gets the maximum number of entries to keep
122:             */
123:            public int getMaxSize() {
124:                return maxSize;
125:            }
126:
127:            /**
128:             * Update the AlarmTable based on the incoming Notification
129:             */
130:            public void update(Notification n) {
131:                if (n instanceof  AlarmTableNotification) {
132:                    // ignore - those notification are
133:                    // meant to be produced only by me
134:                } else if (n instanceof  AlarmNotification) {
135:                    AlarmNotification an = (AlarmNotification) n;
136:
137:                    if (an.getAlarmState() == Alarm.STATE_NONE) {
138:                        updateNotificationStateless(n, an.getSeverity());
139:                    } else {
140:                        updateNotificationStatefull(an);
141:                    }
142:                } else {
143:                    updateNotificationStateless(n, Alarm.SEVERITY_UNKNOWN);
144:                }
145:            }
146:
147:            /**
148:             * Acknowledge an Alarm
149:             *
150:             * @return true if ack was succesful, false otherwise
151:             *         (not in table or acked already)
152:             */
153:            public boolean acknowledge(String alarmId, String user,
154:                    String system) {
155:                AlarmTableNotification atn;
156:
157:                synchronized (this ) {
158:                    AlarmTableNotification entry = (AlarmTableNotification) alarmMap
159:                            .get(alarmId);
160:
161:                    if (entry == null || entry.getAckState() == true) {
162:                        return false; // ack failed
163:                    }
164:                    // ack the alarm
165:                    entry.setAckParams(true, System.currentTimeMillis(), user,
166:                            system);
167:
168:                    // prepare the AlarmTableNotification to send
169:                    atn = new AlarmTableNotification(entry);
170:
171:                    // this is a new notification
172:                    atn.setSequenceNumber(mbeanImpl.getSequenceNumber());
173:                    atn.setTimeStamp(System.currentTimeMillis());
174:
175:                    // if alarm Stateless or Statefull but Cleared, remove from table
176:                    int alarmState = entry.getAlarmState();
177:                    if (alarmState == Alarm.STATE_NONE
178:                            || alarmState == Alarm.STATE_CLEARED) {
179:                        alarmMap.remove(alarmId);
180:                    }
181:                }
182:                // send the AlarmTableNotification
183:                mbeanImpl.emitNotification(atn);
184:
185:                return true; // ok
186:            }
187:
188:            /**
189:             * Unacknowledge an Alarm
190:             *
191:             * @return true if unack was succesful, false otherwise
192:             *         (not in table or unacked already)
193:             */
194:            public boolean unacknowledge(String alarmId, String user,
195:                    String system) {
196:                AlarmTableNotification atn;
197:
198:                synchronized (this ) {
199:                    AlarmTableNotification entry = (AlarmTableNotification) alarmMap
200:                            .get(alarmId);
201:
202:                    if (entry == null || entry.getAckState() == false) {
203:                        return false; // unack failed
204:                    }
205:                    // unack the alarm
206:                    entry.setAckParams(false, System.currentTimeMillis(), user,
207:                            system);
208:
209:                    // prepare the AlarmTableNotification to send
210:                    atn = new AlarmTableNotification(entry);
211:
212:                    // this is a new notification
213:                    atn.setSequenceNumber(mbeanImpl.getSequenceNumber());
214:                    atn.setTimeStamp(System.currentTimeMillis());
215:                }
216:                // send the AlarmTableNotification
217:                mbeanImpl.emitNotification(atn);
218:
219:                return true; // ok
220:            }
221:
222:            /**
223:             * Gets a copy of the AlarmTable
224:             */
225:            public AlarmTableNotification[] getAlarmTable() {
226:                // this syncronized deep copy is quite expensive
227:                synchronized (this ) {
228:                    Collection alarms = alarmMap.values();
229:                    AlarmTableNotification[] array = new AlarmTableNotification[alarms
230:                            .size()];
231:                    return (AlarmTableNotification[]) alarms.toArray(array);
232:                }
233:            }
234:
235:            /**
236:             * Gets the number of entries in the table
237:             */
238:            public int getAlarmSize() {
239:                synchronized (this ) {
240:                    return alarmMap.size();
241:                }
242:            }
243:
244:            // Private Methods -----------------------------------------------
245:
246:            /**
247:             * Since this is stateful, first check if there is already
248:             * an entry in the stateful alarm map, then update both maps.
249:             */
250:            private void updateNotificationStatefull(AlarmNotification an) {
251:                int alarmState = an.getAlarmState();
252:                int severity = an.getSeverity();
253:
254:                // Create a key based on source+type
255:                Object alarmKey = AlarmNotification.createKey(an);
256:
257:                AlarmTableNotification atn;
258:
259:                // Check if this stateful alarm is already stored
260:                synchronized (this ) {
261:                    String alarmId = (String) statefulMap.get(alarmKey);
262:                    if (alarmId == null) {
263:                        // the stateful alarm is not known
264:                        if (isMaxSizeReached()) {
265:                            // return if table is full
266:                            return;
267:                        } else {
268:                            // generate a new Id, if not found
269:                            alarmId = generateAlarmId();
270:                        }
271:                    }
272:                    // create an AlarmTableNotification
273:                    atn = new AlarmTableNotification(alarmId,
274:                            AlarmTableNotification.ALARM_TABLE_UPDATE,
275:                            this .mbeanImpl.getMBeanName(), null, severity,
276:                            alarmState, this .mbeanImpl.getSequenceNumber(),
277:                            System.currentTimeMillis(), null);
278:
279:                    // store a reference to the original notification
280:                    atn.setUserData(an);
281:
282:                    // need to check if acked already, in which case
283:                    // we must copy the ack data to the new AlarmTableNotification
284:                    // and remove the entry from the table         
285:                    if (alarmState == Alarm.STATE_CLEARED) {
286:                        AlarmTableNotification entry = (AlarmTableNotification) alarmMap
287:                                .get(alarmId);
288:
289:                        if (entry != null && entry.getAckState() == true) {
290:                            statefulMap.remove(alarmKey);
291:                            alarmMap.remove(alarmId);
292:
293:                            atn.setAckParams(true, entry.getAckTime(), entry
294:                                    .getAckUser(), entry.getAckSystem());
295:                        } else {
296:                            // just add it
297:                            statefulMap.put(alarmKey, alarmId);
298:                            alarmMap.put(alarmId, atn);
299:                        }
300:                    } else {
301:                        // just add it
302:                        statefulMap.put(alarmKey, alarmId);
303:                        alarmMap.put(alarmId, atn);
304:                    }
305:                }
306:                // the only case to be acked is when it is not stored in table
307:                // in which case send the new AlarmTableNotification itself
308:                if (atn.getAckState() == true) {
309:                    mbeanImpl.emitNotification(atn);
310:                } else // send a copy away
311:                {
312:                    mbeanImpl.emitNotification(new AlarmTableNotification(atn));
313:                }
314:            }
315:
316:            /**
317:             * Store the notification in the active alarm map.
318:             */
319:            private void updateNotificationStateless(Notification n,
320:                    int severity) {
321:                synchronized (this ) {
322:                    if (isMaxSizeReached()) {
323:                        // can't hold no more alarms
324:                        return;
325:                    }
326:                }
327:                // create an AlarmTableNotification
328:                AlarmTableNotification atn = new AlarmTableNotification(
329:                        generateAlarmId(),
330:                        AlarmTableNotification.ALARM_TABLE_UPDATE,
331:                        this .mbeanImpl.getMBeanName(), null, severity,
332:                        Alarm.STATE_NONE, this .mbeanImpl.getSequenceNumber(),
333:                        System.currentTimeMillis(), null);
334:                // store a reference to the original notification
335:                atn.setUserData(n);
336:
337:                // store the AlarmTableNotification - this is always a new entry
338:                synchronized (this ) {
339:                    alarmMap.put(atn.getAlarmId(), atn);
340:                }
341:
342:                // send a copy away
343:                mbeanImpl.emitNotification(new AlarmTableNotification(atn));
344:            }
345:
346:            /**
347:             * Generate a (hopefully) unique alarmId
348:             */
349:            private String generateAlarmId() {
350:                return serverId + '-' + alarmIdCount.increment();
351:            }
352:
353:            /**
354:             * Check if table is full
355:             */
356:            private boolean isMaxSizeReached() {
357:                if (maxSize != -1) {
358:                    return (alarmMap.size() >= maxSize) ? true : false;
359:                } else {
360:                    return false;
361:                }
362:            }
363:        }
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