Source Code Cross Referenced for GaugeMonitor.java in  » JMX » jfoxmx » javax » management » monitor » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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


001:        /* JFox, the OpenSource J2EE Application Server
002:         *
003:         * Copyright (C) 2002 huihoo.org
004:         * Distributable under GNU LGPL license
005:         * See the GNU Lesser General Public License for more details.
006:         */
007:
008:        package javax.management.monitor;
009:
010:        import javax.management.MBeanNotificationInfo;
011:        import javax.management.ObjectName;
012:
013:        /**
014:         * Defines a monitor MBean designed to observe the values of a gauge attribute.
015:         * <P>
016:         * A gauge monitor observes an attribute that is continuously variable with time.
017:         * A gauge monitor sends notifications as follows:
018:         * <UL>
019:         * <LI> if the attribute value is increasing and becomes equal to or greater than the high threshold value,
020:         *      a {@link MonitorNotification#THRESHOLD_HIGH_VALUE_EXCEEDED threshold high notification} is sent.
021:         *      The notify high flag must be set to <CODE>true</CODE>
022:         *      <BR>Subsequent crossings of the high threshold value do not cause further notifications unless
023:         *      the attribute value becomes equal to or less than the low threshold value.
024:         * <LI> if the attribute value is decreasing and becomes equal to or less than the low threshold value,
025:         *      a {@link MonitorNotification#THRESHOLD_LOW_VALUE_EXCEEDED threshold low notification} is sent.
026:         *      The notify low flag must be set to <CODE>true</CODE>.
027:         *      <BR>Subsequent crossings of the low threshold value do not cause further notifications unless
028:         *      the attribute value becomes equal to or greater than the high threshold value.
029:         * </UL>
030:         * This provides a hysteresis mechanism to avoid repeated triggering of notifications when
031:         * the attribute value makes small oscillations around the high or low threshold value.
032:         * <P>
033:         * If the gauge difference mode is used, the value of the derived gauge is calculated
034:         * as the difference between the observed gauge values for two successive observations.
035:         * <BR>The derived gauge value (V[t]) is calculated using the following method:
036:         * <UL>
037:         * <LI>V[t] = gauge[t] - gauge[t-GP]
038:         * </UL>
039:         * This implementation of the gauge monitor requires the observed attribute to be of the type integer or floating-point
040:         * (<CODE>Byte</CODE>, <CODE>Integer</CODE>, <CODE>Short</CODE>, <CODE>Long</CODE>, <CODE>Float</CODE>, <CODE>Double</CODE>).
041:         * 
042:         * @author <a href="mailto:young_yy@hotmail.org">Young Yang</a>
043:         */
044:
045:        public class GaugeMonitor extends Monitor implements  GaugeMonitorMBean {
046:            private double highThreshold = 0.0f;
047:            private double lowThreshold = 0.0f;
048:            private boolean notifyHigh = false;
049:            private boolean notifyLow = false;
050:            private boolean differenceMode = false;
051:            private boolean highNotified = false;
052:            private boolean lowNotified = false;
053:            private Class gaugeClass = null;
054:
055:            public void start() {
056:                _start();
057:            }
058:
059:            public void stop() {
060:                _stop();
061:            }
062:
063:            public Number getDerivedGauge(ObjectName observedObject) {
064:                return getNumber(((GaugeMonitorData) getMonitorData(observedObject)).derivedGauge);
065:            }
066:
067:            public long getDerivedGaugeTimeStamp(ObjectName observedObject) {
068:                return ((GaugeMonitorData) getMonitorData(observedObject)).derivedGaugeTimestamp;
069:            }
070:
071:            public Number getHighThreshold() {
072:                return getNumber(highThreshold);
073:            }
074:
075:            public Number getLowThreshold() {
076:                return getNumber(lowThreshold);
077:            }
078:
079:            public void setThresholds(Number highValue, Number lowValue)
080:                    throws java.lang.IllegalArgumentException {
081:                if (highValue == null || lowValue == null) {
082:                    throw new IllegalArgumentException(
083:                            "Threshold values cannot be null");
084:                }
085:                if (!highValue.getClass().equals(lowValue.getClass())) {
086:                    throw new IllegalArgumentException(
087:                            "The high and the low thresholds must be of the same type.");
088:                }
089:                if (highValue.doubleValue() < lowValue.doubleValue()) {
090:                    throw new IllegalArgumentException(
091:                            "The threshold high value must be greater than or equal to threshold low value.");
092:                }
093:
094:                checkNumber(highValue);
095:
096:                highThreshold = highValue.doubleValue();
097:                lowThreshold = lowValue.doubleValue();
098:                highNotified = false;
099:                lowNotified = false;
100:            }
101:
102:            public boolean getNotifyHigh() {
103:                return notifyHigh;
104:            }
105:
106:            public void setNotifyHigh(boolean value) {
107:                this .notifyHigh = value;
108:                highNotified = false;
109:            }
110:
111:            public boolean getNotifyLow() {
112:                return notifyLow;
113:            }
114:
115:            public void setNotifyLow(boolean value) {
116:                this .notifyLow = value;
117:                lowNotified = false;
118:            }
119:
120:            public boolean getDifferenceMode() {
121:                return differenceMode;
122:            }
123:
124:            public void setDifferenceMode(boolean value) {
125:                this .differenceMode = value;
126:            }
127:
128:            public MBeanNotificationInfo[] getNotificationInfo() {
129:                String[] types = { MonitorNotification.RUNTIME_ERROR,
130:                        MonitorNotification.OBSERVED_OBJECT_ERROR,
131:                        MonitorNotification.OBSERVED_ATTRIBUTE_ERROR,
132:                        MonitorNotification.OBSERVED_ATTRIBUTE_TYPE_ERROR,
133:                        MonitorNotification.THRESHOLD_ERROR,
134:                        MonitorNotification.THRESHOLD_HIGH_VALUE_EXCEEDED,
135:                        MonitorNotification.THRESHOLD_LOW_VALUE_EXCEEDED };
136:                MBeanNotificationInfo[] notifsInfo = { new MBeanNotificationInfo(
137:                        types, "javax.management.monitor.MonitorNotification",
138:                        "Notifications sent by the GaugeMonitor MBean") };
139:                return notifsInfo;
140:            }
141:
142:            // implemented by every entity monitor
143:            protected void doMonitor(ObjectName observedObject, Object value) {
144:                GaugeMonitorData data = (GaugeMonitorData) getMonitorData(observedObject);
145:                try {
146:                    long derivedGaugeTimestamp = System.currentTimeMillis(); // update timestamp
147:                    data.derivedGaugeTimestamp = derivedGaugeTimestamp;
148:
149:                    if (!gaugeClass.isInstance(value)) {
150:                        sendNotification(
151:                                MonitorNotification.OBSERVED_ATTRIBUTE_TYPE_ERROR,
152:                                derivedGaugeTimestamp,
153:                                "The observed attribute type must be an integer type or a floating-point type.",
154:                                null, null, observedObject);
155:                        return;
156:                    }
157:
158:                    if (highThreshold == 0.0f || lowThreshold == 0.0f) {
159:                        sendNotification(
160:                                MonitorNotification.THRESHOLD_ERROR,
161:                                derivedGaugeTimestamp,
162:                                "The threshold high and threshold low must not be zero",
163:                                null, null, observedObject);
164:                        return;
165:                    }
166:
167:                    // update derived gauge
168:                    if (!differenceMode) { // is difference mode
169:                        data.derivedGauge = ((Number) value).doubleValue();
170:                    } else { // not difference mode
171:                        data.derivedGauge = ((Number) value).doubleValue()
172:                                - data.lastDerivedGauge;
173:                        data.lastDerivedGauge = ((Number) value).doubleValue();
174:                    }
175:
176:                    // send notification
177:                    if (notifyHigh && !highNotified
178:                            && data.derivedGauge > highThreshold) {
179:                        sendNotification(
180:                                MonitorNotification.THRESHOLD_HIGH_VALUE_EXCEEDED,
181:                                derivedGaugeTimestamp, "",
182:                                getDerivedGauge(observedObject),
183:                                getHighThreshold(), observedObject);
184:                        highNotified = true;
185:                        lowNotified = false;
186:                    }
187:                    if (notifyLow && !lowNotified
188:                            && data.derivedGauge < lowThreshold) {
189:                        sendNotification(
190:                                MonitorNotification.THRESHOLD_LOW_VALUE_EXCEEDED,
191:                                derivedGaugeTimestamp, "",
192:                                getDerivedGauge(observedObject),
193:                                getLowThreshold(), observedObject);
194:                        lowNotified = true;
195:                        highNotified = false;
196:                    }
197:                } catch (Exception e) {
198:                    e.printStackTrace();
199:                    sendNotification(MonitorNotification.RUNTIME_ERROR,
200:                            data.derivedGaugeTimestamp, e.getMessage(), null,
201:                            null, observedObject);
202:                }
203:
204:            }
205:
206:            public void addObservedObject(ObjectName objectName)
207:                    throws IllegalArgumentException {
208:                if (objectName == null)
209:                    throw new IllegalArgumentException(
210:                            "The object to observe cannot be null.");
211:                observedObjects.put(objectName,
212:                        new GaugeMonitorData(objectName));
213:            }
214:
215:            // decide the type according the gaugeClass
216:            private Number getNumber(double value) {
217:                if (gaugeClass == null)
218:                    return null;
219:                try {
220:                    if (gaugeClass == java.lang.Float.class
221:                            || gaugeClass == java.lang.Double.class) { // float type
222:                        return (Number) (gaugeClass
223:                                .getConstructor(new Class[] { java.lang.String.class })
224:                                .newInstance(new Object[] { "" + value }));
225:                    } else { // integer type
226:                        return (Number) (gaugeClass
227:                                .getConstructor(new Class[] { java.lang.String.class })
228:                                .newInstance(new Object[] { "" + (long) value }));
229:                    }
230:                } catch (Exception e) {
231:                    e.printStackTrace();
232:                    return null;
233:                }
234:            }
235:
236:            private void checkNumber(Number value) {
237:                if (gaugeClass != null && !gaugeClass.isInstance(value)) {
238:                    throw new java.lang.IllegalArgumentException(
239:                            "The threshold, offset and modulus must be of the same type as the counter.");
240:                }
241:                gaugeClass = value.getClass();
242:
243:            }
244:
245:            class GaugeMonitorData extends MonitorData {
246:                double derivedGauge = 0.0f;
247:                double lastDerivedGauge = 0.0f;
248:                long derivedGaugeTimestamp = System.currentTimeMillis();
249:
250:                public GaugeMonitorData(ObjectName objectName) {
251:                    super (objectName);
252:                }
253:
254:                public ObjectName getObjectName() {
255:                    return super.getObjectName();
256:                }
257:            }
258:        }
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