server/client/Register.java

/* 
 * i-scream central monitoring system
 * http://www.i-scream.org.uk
 * Copyright (C) 2000-2002 i-scream
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

//---PACKAGE DECLARATION---
package uk.org.iscream.cms.server.client;

//---IMPORTS---
import uk.org.iscream.cms.util.*;
import uk.org.iscream.cms.server.componentmanager.*;

/**
 * The Register class holds theshold values,
 * the last level of alert for each attribute for a monitor
 * and the time of last alert sent for each alert level.
 *
 * This class is used by monitor classes so they can determine
 * how often they should send alerts when breaching alert levels.
 * It also stores (and keeps uptodate (via the configuration proxy)
 * the threshold values for the monitor.
 *
 * @author  $Author: tdb $
 * @version $Id: Register.java,v 1.20 2003/02/05 16:43:45 tdb Exp $
 */
public class Register {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public static final String REVISION = "$Revision: 1.20 $";
    
//---STATIC METHODS---

//---CONSTRUCTORS---
    
    /**
     * Construct a Register with the hostname and monitorName 
     * (for obtaining the threshold values).
     * This constructs a generic register for a specific monitor.
     *
     * @param hostname the hostname this register is for
     * @param monitorName the monitor this register is for
     */
    public Register(String hostname, String monitorName) {
        this(hostname, monitorName, null);    
    }

    /**
     * Construct a Register with the hostname and monitorName 
     * (for obtaining the threshold values).
     * This constructs a register for a specific attribute check
     * by a monitor.
     *
     * @param hostname the hostname this register is for
     * @param monitorName the monitor this register is for
     * @param attributeName the specific attribute this register is for
     */
    public Register(String hostname, String monitorName, String attributeName) {
        _hostname = hostname;
        _monitorName = monitorName;
        _attributeName = attributeName;
        _lastAlertLevel = 0;
        _lastThresholdLevel = 0;
        _initialAlertTime= 0;
        _lastAlertTimeout = 0;
        _times = new long[Alert.alertLevels.length];
        // initialise the arrays to 0
        for(int x = 0; x < Alert.alertLevels.length; x++) {
            _times[x] = 0;
        }
    }
        

//---PUBLIC METHODS---

    /**
     * Advances the alert level to the next one up.
     *
     * This keeps track of the number of the number
     * of times the highest NON-FINAL alert level
     * has been reached.  Note this isn't a specific
     * level, just the highest, so you could configure
     * more levels and not affect this.
     *
     * If the count exceeds the number of times
     * set in the configuration, it escalates to 
     * a FINAL alert if we're using FINAL's.
     *
     * It determines if to use FINAL's from the config
     * entry reachFINALcount, when the count exceeds
     * this value, it escalates to a FINAL.  If that attribute
     * is mis-read or is not configured.  It will NEVER reach
     * a FINAL.
     */
    public void escalateAlert() {
        // don't escalate if we're already on the last alert
        if(getLastAlertLevel() != Alert.alertLevels.length -1) {
            setLastAlertLevel(getNextAlertLevel());
        }
        try {
            // note if we fail to get this value, we won't process the res of this
            int reachFINALcount = Integer.parseInt(_cp.getProperty("Host." + _hostname, "Monitor." + _monitorName + ".reachFINALcount"));
            if (getLastAlertLevel() == Alert.alertLevels.length - 2) {
                _maxLevelCount++;
                if(_maxLevelCount > reachFINALcount) {
                    setLastAlertLevel(Alert.alertFINAL);
                }
            }
        } catch (PropertyNotFoundException e) {
            // we NEVER reach FINAL in this case
        } catch (NumberFormatException e) {
            // we NEVER reach FINAL in this case
        }
    }

//---PRIVATE METHODS---

    /**
     * Obtains a threshold value from the configuration for a given level.
     * The attribute name specifies which property to get.
     * eg, attributeName = idle it will look for
     *     Monitor.<monitor name>.idle.threshold.<alert level>
     * eg, attributeName = null
     *     Monitor.<monitor name>.threshold.<alert level>
     *
     * Note that if its null, this will get the threshold for the monitor
     * as a whole, not the specific attribute.
     *
     * @param level the alert level to get the attribute for
     * @param attributeName the attribute to get the threshold for
     *
     * @return the threshold obtained
     */    
    private String getThresholdConfig(int level, String attributeName) throws PropertyNotFoundException {
        String temp = "";
        if (attributeName != null) {
            temp = "." + attributeName;
        }
        return _cp.getProperty("Host." + _hostname, "Monitor." + _monitorName + temp + ".threshold." + Alert.thresholdLevels[level]);
    }

//---ACCESSOR/MUTATOR METHODS---
    
    /**
     * Gets the last alert level
     *
     * @return the last alert level
     */
    public int getLastAlertLevel() {
        return _lastAlertLevel;
    }
    
    /**
     * Sets the last threshold level
     *
     * @param level the new last threshold level
     */
    public void setLastThresholdLevel(int level) {
        _lastThresholdLevel = level;
    }
    
    /**
     * Gets the last threshold level
     *
     * @return the last threshold level
     */
    public int getLastThresholdLevel() {
        return _lastThresholdLevel;
    }
    
    /**
     * Sets the last alert level
     *
     * Note that if this is setting to an OK
     * level alert, it resets _maxLevelCount.
     *
     * This also sets the "initialAlertTime" 
     * if the next alert after OK is set.
     * And resets it to 0 if it IS an OK.
     *
     * @param level the new last alert level
     */
    public void setLastAlertLevel(int level) {
        _lastAlertLevel = level;
        if (level == Alert.alertOK) {
            _maxLevelCount = 0;
            // we won't do this, so OK's still have the initialAlertTime
            // of the original alert they're OK'ing
            //_initialAlertTime = 0;
        }
        if (level == Alert.alertOK + 1) {
            _initialAlertTime = System.currentTimeMillis();
        }
    }
    
    /**
     * Gets the time an alert was sent at the given level.
     *
     * @param level the alert level to get
     *
     * @return the time last sent
     */
    public long getTimeLastSent() {
        return _times[getLastAlertLevel()];
    }
    
    /**
     * Gets the time an alert was sent at the given level.
     *
     * @param level the alert level to get
     * @param value the new time
     */
    public void setTimeLastSent(long value) {
        _times[getLastAlertLevel()] = value;
    }
    
    /**
     * Gets the threshold value for the given
     * level of alert.
     *
     * If there is no alert threshold for a 
     * given level, this returns -1.0
     *
     * @param level the alert level
     */
    public double getThreshold(int level) {
        // -1.0 means we don't use an alert level
        double threshold = -1.0;
        try {
            String thresholdString = "";
            try {
                thresholdString = getThresholdConfig(level, _attributeName);
            } catch (PropertyNotFoundException e) {
                thresholdString = getThresholdConfig(level, null);
            }
            threshold = Double.parseDouble(thresholdString);
        } catch (PropertyNotFoundException e) {
            threshold = -1.0;
        } catch (NumberFormatException e) {
            threshold = -1.0;
        }
        return threshold;
    }
    
    /**
     * Gets the alert timeout value for the given
     * level of alert.  This value is in millis,
     * and is converted from the value in the config,
     * which should be seconds.
     *
     * Note that if the alert timeout for the current monitor
     * is not configured, it will try to obtain the default
     * timeout for all Monitor's.  If there is no alert timeout
     * for either the monitor or a default setting this returns 0.
     *
     * Note that this is dependant on the threshold value
     * given, the timeout is obatined from the config, then
     * divided by the threshold value, this allows alerts to
     * progress faster should a higher threshold value be passed
     *
     * @param level the alert level
     * @param thresholdLevel the threshold leve we are on
     */
    public long getAlertTimeout(int level) {
        // 0 means we don't use this value
        long timeout = 0;
        try {
            String timeoutString;
            try {
                timeoutString = _cp.getProperty("Host." + _hostname, "Monitor." + _monitorName + ".alertTimeout." + Alert.alertLevels[level]);
            } catch (PropertyNotFoundException e) {
                // if there is no timeout for the monitor
                // check for a default
                timeoutString = _cp.getProperty("Host." + _hostname, "Monitor.alertTimeout." + Alert.alertLevels[level]);
            }    
            int threshold = getLastThresholdLevel();
            if (threshold > 0) {
                timeout = (Long.parseLong(timeoutString) / threshold) * 1000;
            }
        } catch (PropertyNotFoundException e) {
            timeout = 0;
        } catch (NumberFormatException e) {
            timeout = 0;
        }
        return timeout;
    }
    
    /**
     * Either advances to the next alert level, or if
     * the maximum alert level has been reached, simply returns
     * that.
     *
     * Note this method will NEVER reach the last alert level
     * in the list, this is assumed to be FINAL, and special
     * logic is in place to handle that.
     *
     */
    public int getNextAlertLevel() {
        if((getLastAlertLevel() + 1) > (Alert.alertLevels.length - 2)) {
            return getLastAlertLevel();
        }
        return getLastAlertLevel() + 1;
    }

    /**
     * Gets the timeout value of the last alert
     * sent
     *
     * @return the last timeout value
     */
    public long getLastAlertTimeout() {
        return _lastAlertTimeout;
    }
    
    /**
     * Sets the timeout value of the last alert
     * sent
     *
     * @param timeout the new value
     */
    public void setLastAlertTimeout(long timeout) {
        _lastAlertTimeout = timeout;
    }

    /**
     * Returns the time that the first alert was sent
     * for an attribute that has passed a threshold value
     *
     */
    public long getInitialAlertTime() {
        return _initialAlertTime;
    }

//---ATTRIBUTES---

    /**
     * The host this register is for
     */
    private String _hostname;
    
    /**
     * The monitor this register is for
     */
    private String _monitorName;
    
    /**
     * The attribute name, as obtained from
     * the configuration.
     * eg, idle or /var
     */
    private String _attributeName;

    /**
     * An array of last alert levels for
     * each attribute this register is looking
     * after.
     */
    private int _lastAlertLevel;
    
    /**
     * An array of last threshold levels for
     * each attribute this register is looking
     * after.
     */
    private int _lastThresholdLevel;
    
    /**
     * An array of last alert timeout levels for
     * each attribute this register is looking
     * after.
     */
    private long _lastAlertTimeout;
    
    /**
     * An array of arrays containing
     * time an alert of each level
     * was last sent for each attribute.
     */
    private long[] _times;
    
    /**
     * Initial times that an alert was first
     * raised.
     */
    private long _initialAlertTime;

    /**
     * A reference to the configuration proxy in use
     */
    private ConfigurationProxy _cp = ConfigurationProxy.getInstance();
    
    /**
     * The number of times the maximum level alert
     * has occured IN A ROW, this is escalated by
     * the escalate(int) method, and reset by the 
     * setLastAlertLevel(int, int) method
     */
    private int _maxLevelCount = 0;

//---STATIC ATTRIBUTES---

}
Revision:	1.21
Committed:	Thu Jan 15 13:41:47 2004 UTC (20 years, 4 months ago) by tdb
Branch:	MAIN
Changes since 1.20:	+42 -43 lines
Log Message:	Assuming I can still program in Java, these changes allow monitoring to be disabled at a per-host level or a per-host-per-monitor level.
#	Content
1	/*
2	* i-scream central monitoring system
3	* http://www.i-scream.org.uk
4	* Copyright (C) 2000-2002 i-scream
5	*
6	* This program is free software; you can redistribute it and/or
7	* modify it under the terms of the GNU General Public License
8	* as published by the Free Software Foundation; either version 2
9	* of the License, or (at your option) any later version.
10	*
11	* This program is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.
15	*
16	* You should have received a copy of the GNU General Public License
17	* along with this program; if not, write to the Free Software
18	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19	*/
20
21	//---PACKAGE DECLARATION---
22	package uk.org.iscream.cms.server.client;
23
24	//---IMPORTS---
25	import uk.org.iscream.cms.util.*;
26	import uk.org.iscream.cms.server.componentmanager.*;
27
28	/**
29	* The Register class holds theshold values,
30	* the last level of alert for each attribute for a monitor
31	* and the time of last alert sent for each alert level.
32	*
33	* This class is used by monitor classes so they can determine
34	* how often they should send alerts when breaching alert levels.
35	* It also stores (and keeps uptodate (via the configuration proxy)
36	* the threshold values for the monitor.
37	*
38	* @author $Author: tdb $
39	* @version $Id: Register.java,v 1.20 2003/02/05 16:43:45 tdb Exp $
40	*/
41	public class Register {
42
43	//---FINAL ATTRIBUTES---
44
45	/**
46	* The current CVS revision of this class
47	*/
48	public static final String REVISION = "$Revision: 1.20 $";
49
50	//---STATIC METHODS---
51
52	//---CONSTRUCTORS---
53
54	/**
55	* Construct a Register with the hostname and monitorName
56	* (for obtaining the threshold values).
57	* This constructs a generic register for a specific monitor.
58	*
59	* @param hostname the hostname this register is for
60	* @param monitorName the monitor this register is for
61	*/
62	public Register(String hostname, String monitorName) {
63	this(hostname, monitorName, null);
64	}
65
66	/**
67	* Construct a Register with the hostname and monitorName
68	* (for obtaining the threshold values).
69	* This constructs a register for a specific attribute check
70	* by a monitor.
71	*
72	* @param hostname the hostname this register is for
73	* @param monitorName the monitor this register is for
74	* @param attributeName the specific attribute this register is for
75	*/
76	public Register(String hostname, String monitorName, String attributeName) {
77	_hostname = hostname;
78	_monitorName = monitorName;
79	_attributeName = attributeName;
80	_lastAlertLevel = 0;
81	_lastThresholdLevel = 0;
82	_initialAlertTime= 0;
83	_lastAlertTimeout = 0;
84	_times = new long[Alert.alertLevels.length];
85	// initialise the arrays to 0
86	for(int x = 0; x < Alert.alertLevels.length; x++) {
87	_times[x] = 0;
88	}
89	}
90
91
92	//---PUBLIC METHODS---
93
94	/**
95	* Advances the alert level to the next one up.
96	*
97	* This keeps track of the number of the number
98	* of times the highest NON-FINAL alert level
99	* has been reached. Note this isn't a specific
100	* level, just the highest, so you could configure
101	* more levels and not affect this.
102	*
103	* If the count exceeds the number of times
104	* set in the configuration, it escalates to
105	* a FINAL alert if we're using FINAL's.
106	*
107	* It determines if to use FINAL's from the config
108	* entry reachFINALcount, when the count exceeds
109	* this value, it escalates to a FINAL. If that attribute
110	* is mis-read or is not configured. It will NEVER reach
111	* a FINAL.
112	*/
113	public void escalateAlert() {
114	// don't escalate if we're already on the last alert
115	if(getLastAlertLevel() != Alert.alertLevels.length -1) {
116	setLastAlertLevel(getNextAlertLevel());
117	}
118	try {
119	// note if we fail to get this value, we won't process the res of this
120	int reachFINALcount = Integer.parseInt(_cp.getProperty("Host." + _hostname, "Monitor." + _monitorName + ".reachFINALcount"));
121	if (getLastAlertLevel() == Alert.alertLevels.length - 2) {
122	_maxLevelCount++;
123	if(_maxLevelCount > reachFINALcount) {
124	setLastAlertLevel(Alert.alertFINAL);
125	}
126	}
127	} catch (PropertyNotFoundException e) {
128	// we NEVER reach FINAL in this case
129	} catch (NumberFormatException e) {
130	// we NEVER reach FINAL in this case
131	}
132	}
133
134	//---PRIVATE METHODS---
135
136	/**
137	* Obtains a threshold value from the configuration for a given level.
138	* The attribute name specifies which property to get.
139	* eg, attributeName = idle it will look for
140	* Monitor.<monitor name>.idle.threshold.<alert level>
141	* eg, attributeName = null
142	* Monitor.<monitor name>.threshold.<alert level>
143	*
144	* Note that if its null, this will get the threshold for the monitor
145	* as a whole, not the specific attribute.
146	*
147	* @param level the alert level to get the attribute for
148	* @param attributeName the attribute to get the threshold for
149	*
150	* @return the threshold obtained
151	*/
152	private String getThresholdConfig(int level, String attributeName) throws PropertyNotFoundException {
153	String temp = "";
154	if (attributeName != null) {
155	temp = "." + attributeName;
156	}
157	return _cp.getProperty("Host." + _hostname, "Monitor." + _monitorName + temp + ".threshold." + Alert.thresholdLevels[level]);
158	}
159
160	//---ACCESSOR/MUTATOR METHODS---
161
162	/**
163	* Gets the last alert level
164	*
165	* @return the last alert level
166	*/
167	public int getLastAlertLevel() {
168	return _lastAlertLevel;
169	}
170
171	/**
172	* Sets the last threshold level
173	*
174	* @param level the new last threshold level
175	*/
176	public void setLastThresholdLevel(int level) {
177	_lastThresholdLevel = level;
178	}
179
180	/**
181	* Gets the last threshold level
182	*
183	* @return the last threshold level
184	*/
185	public int getLastThresholdLevel() {
186	return _lastThresholdLevel;
187	}
188
189	/**
190	* Sets the last alert level
191	*
192	* Note that if this is setting to an OK
193	* level alert, it resets _maxLevelCount.
194	*
195	* This also sets the "initialAlertTime"
196	* if the next alert after OK is set.
197	* And resets it to 0 if it IS an OK.
198	*
199	* @param level the new last alert level
200	*/
201	public void setLastAlertLevel(int level) {
202	_lastAlertLevel = level;
203	if (level == Alert.alertOK) {
204	_maxLevelCount = 0;
205	// we won't do this, so OK's still have the initialAlertTime
206	// of the original alert they're OK'ing
207	//_initialAlertTime = 0;
208	}
209	if (level == Alert.alertOK + 1) {
210	_initialAlertTime = System.currentTimeMillis();
211	}
212	}
213
214	/**
215	* Gets the time an alert was sent at the given level.
216	*
217	* @param level the alert level to get
218	*
219	* @return the time last sent
220	*/
221	public long getTimeLastSent() {
222	return _times[getLastAlertLevel()];
223	}
224
225	/**
226	* Gets the time an alert was sent at the given level.
227	*
228	* @param level the alert level to get
229	* @param value the new time
230	*/
231	public void setTimeLastSent(long value) {
232	_times[getLastAlertLevel()] = value;
233	}
234
235	/**
236	* Gets the threshold value for the given
237	* level of alert.
238	*
239	* If there is no alert threshold for a
240	* given level, this returns -1.0
241	*
242	* @param level the alert level
243	*/
244	public double getThreshold(int level) {
245	// -1.0 means we don't use an alert level
246	double threshold = -1.0;
247	try {
248	String thresholdString = "";
249	try {
250	thresholdString = getThresholdConfig(level, _attributeName);
251	} catch (PropertyNotFoundException e) {
252	thresholdString = getThresholdConfig(level, null);
253	}
254	threshold = Double.parseDouble(thresholdString);
255	} catch (PropertyNotFoundException e) {
256	threshold = -1.0;
257	} catch (NumberFormatException e) {
258	threshold = -1.0;
259	}
260	return threshold;
261	}
262
263	/**
264	* Gets the alert timeout value for the given
265	* level of alert. This value is in millis,
266	* and is converted from the value in the config,
267	* which should be seconds.
268	*
269	* Note that if the alert timeout for the current monitor
270	* is not configured, it will try to obtain the default
271	* timeout for all Monitor's. If there is no alert timeout
272	* for either the monitor or a default setting this returns 0.
273	*
274	* Note that this is dependant on the threshold value
275	* given, the timeout is obatined from the config, then
276	* divided by the threshold value, this allows alerts to
277	* progress faster should a higher threshold value be passed
278	*
279	* @param level the alert level
280	* @param thresholdLevel the threshold leve we are on
281	*/
282	public long getAlertTimeout(int level) {
283	// 0 means we don't use this value
284	long timeout = 0;
285	try {
286	String timeoutString;
287	try {
288	timeoutString = _cp.getProperty("Host." + _hostname, "Monitor." + _monitorName + ".alertTimeout." + Alert.alertLevels[level]);
289	} catch (PropertyNotFoundException e) {
290	// if there is no timeout for the monitor
291	// check for a default
292	timeoutString = _cp.getProperty("Host." + _hostname, "Monitor.alertTimeout." + Alert.alertLevels[level]);
293	}
294	int threshold = getLastThresholdLevel();
295	if (threshold > 0) {
296	timeout = (Long.parseLong(timeoutString) / threshold) * 1000;
297	}
298	} catch (PropertyNotFoundException e) {
299	timeout = 0;
300	} catch (NumberFormatException e) {
301	timeout = 0;
302	}
303	return timeout;
304	}
305
306	/**
307	* Either advances to the next alert level, or if
308	* the maximum alert level has been reached, simply returns
309	* that.
310	*
311	* Note this method will NEVER reach the last alert level
312	* in the list, this is assumed to be FINAL, and special
313	* logic is in place to handle that.
314	*
315	*/
316	public int getNextAlertLevel() {
317	if((getLastAlertLevel() + 1) > (Alert.alertLevels.length - 2)) {
318	return getLastAlertLevel();
319	}
320	return getLastAlertLevel() + 1;
321	}
322
323	/**
324	* Gets the timeout value of the last alert
325	* sent
326	*
327	* @return the last timeout value
328	*/
329	public long getLastAlertTimeout() {
330	return _lastAlertTimeout;
331	}
332
333	/**
334	* Sets the timeout value of the last alert
335	* sent
336	*
337	* @param timeout the new value
338	*/
339	public void setLastAlertTimeout(long timeout) {
340	_lastAlertTimeout = timeout;
341	}
342
343	/**
344	* Returns the time that the first alert was sent
345	* for an attribute that has passed a threshold value
346	*
347	*/
348	public long getInitialAlertTime() {
349	return _initialAlertTime;
350	}
351
352	//---ATTRIBUTES---
353
354	/**
355	* The host this register is for
356	*/
357	private String _hostname;
358
359	/**
360	* The monitor this register is for
361	*/
362	private String _monitorName;
363
364	/**
365	* The attribute name, as obtained from
366	* the configuration.
367	* eg, idle or /var
368	*/
369	private String _attributeName;
370
371	/**
372	* An array of last alert levels for
373	* each attribute this register is looking
374	* after.
375	*/
376	private int _lastAlertLevel;
377
378	/**
379	* An array of last threshold levels for
380	* each attribute this register is looking
381	* after.
382	*/
383	private int _lastThresholdLevel;
384
385	/**
386	* An array of last alert timeout levels for
387	* each attribute this register is looking
388	* after.
389	*/
390	private long _lastAlertTimeout;
391
392	/**
393	* An array of arrays containing
394	* time an alert of each level
395	* was last sent for each attribute.
396	*/
397	private long[] _times;
398
399	/**
400	* Initial times that an alert was first
401	* raised.
402	*/
403	private long _initialAlertTime;
404
405	/**
406	* A reference to the configuration proxy in use
407	*/
408	private ConfigurationProxy _cp = ConfigurationProxy.getInstance();
409
410	/**
411	* The number of times the maximum level alert
412	* has occured IN A ROW, this is escalated by
413	* the escalate(int) method, and reset by the
414	* setLastAlertLevel(int, int) method
415	*/
416	private int _maxLevelCount = 0;
417
418	//---STATIC ATTRIBUTES---
419
420	}