client/monitors/Heartbeat__Monitor.java

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

//---IMPORTS---
import java.util.HashMap;
import java.util.Iterator;
import java.util.StringTokenizer;
import uk.org.iscream.cms.server.client.*;
import uk.org.iscream.cms.server.core.*;
import uk.org.iscream.cms.server.util.*;
import uk.org.iscream.cms.server.componentmanager.*;

/**
 * This Monitor watches heartbeats.
 * It generates an alert when a heartbeat that is expected
 * does not arrive. Unlike all the other monitors, this one
 * is driven by an event *not* occuring, rather than an
 * event occuring. This means it must be actively checking
 * for missing heartbeat's, and thus has an extra inner class
 * thread.
 *
 * @author  $Author: tdb1 $
 * @version $Id: Heartbeat__Monitor.java,v 1.20 2001/05/29 17:02:34 tdb1 Exp $
 */
public class Heartbeat__Monitor extends MonitorSkeleton {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public final String REVISION = "$Revision: 1.20 $";
    
    /**
     * A description of this monitor
     */
    public final String DESC = "Monitors Heartbeats.";
    
    /**
     * The default (used if not configured) period at
     * which to check for old heartbeats. (in seconds)
     */
    public final int DEFAULT_CHECK_PERIOD = 60;
    
//---STATIC METHODS---

//---CONSTRUCTORS---
    
    /**
     * Constructs a new Heartbeat monitor, and starts off
     * the worker thread.
     */
    public Heartbeat__Monitor() {
        super();
        createInitialHosts();
        new HeartbeatWorker().start();
    }

//---PUBLIC METHODS---
    
    /**
     * Analyse a packet of data. In this case, this will just
     * register the fact that a heartbeat has arrived.
     *
     * @param packet The packet of data to analyse
     */
    public void analysePacket(XMLPacket packet) {
        String source = packet.getParam("packet.attributes.machine_name");
        if (!_hosts.containsKey(source)) {
            synchronized(this) {
                _hosts.put(source, new HeartbeatHolder(new Register(source, _name)));
            }
        }
        HeartbeatHolder lastHeartbeat = (HeartbeatHolder) _hosts.get(source);
        lastHeartbeat.setLastHeartbeat(System.currentTimeMillis()/1000);
    }
    
    /**
     * Overrides the {@link java.lang.Object#toString() Object.toString()}
     * method to provide clean logging (every class should have this).
     *
     * This uses the uk.org.iscream.cms.server.util.NameFormat class
     * to format the toString()
     *
     * @return the name of this class and its CVS revision
     */
    public String toString() {
        return FormatName.getName(
            _name,
            getClass().getName(),
            REVISION);
    }

    /**
     * return the String representation of what the monitor does
     */
    public String getDescription(){
        return DESC;
    }

//---PRIVATE METHODS---
    
    /**
     * Checks whether the time since the last heartbeat
     * is beyond the threshold(s).
     *
     * @param timeSinceLastHB a long time since the last heartbeat arrived
     * @param reg the Register for this host
     * @return the level which has been breached, if any
     */
    private int checkAttributeThreshold(long timeSinceLastHB, Register reg) {
        for(int thresholdLevel = Alert.thresholdLevels.length - 1; thresholdLevel >= 0; thresholdLevel--) {
            if (reg.getThreshold(thresholdLevel) != -1.0) {
                if (((long) reg.getThreshold(thresholdLevel)) < timeSinceLastHB) {
                    return thresholdLevel;
                }
            }
        }
        return Alert.thresholdNORMAL;
    }
    
    /**
     * Gets an initial list of hosts from the config
     * and adds a fake set of heartbeats for them.
     * If the hosts don't respond within the timeout
     * period an alert will be raised.
     *
     * The effect of this is to allow us to know about
     * hosts which weren't on when we started up, and
     * will thus never have generated a heartbeat - yet
     * will still want to know they're not responding.
     */
    private void createInitialHosts() {
        // get the initial list of hosts from the config
        String initialHosts = "";
        try {
            initialHosts = _cp.getProperty(_name, "Monitor.Heartbeat.initialHosts");
        } catch (PropertyNotFoundException e) {
            // just leave initialHosts empty
            _logger.write(Heartbeat__Monitor.this.toString(), Logger.DEBUG, "No initial list of hosts set, defaulting to none.");
        }
        
        // parse through the initial hosts adding them
        StringTokenizer st = new StringTokenizer(initialHosts, ";");
        while (st.hasMoreTokens()) {
            String source = st.nextToken();
            // check if they already exist, don't want to add them twice
            if (!_hosts.containsKey(source)) {
                synchronized(this) {
                    _hosts.put(source, new HeartbeatHolder(new Register(source, _name)));
                }
            }
            HeartbeatHolder lastHeartbeat = (HeartbeatHolder) _hosts.get(source);
            // set a "fake" heartbeat
            lastHeartbeat.setLastHeartbeat(System.currentTimeMillis()/1000);
        }
    }

//---ACCESSOR/MUTATOR METHODS---
    
    /**
     * Returns a reference to the Queue we're getting data
     * from. This is specific to this monitor.
     *
     * @return a reference to a Queue to get data from
     */
    protected Queue getQueue() {
        return MonitorManager.getInstance().getHeartbeatQueue();
    }
    
//---ATTRIBUTES---

    /**
     * This is the friendly identifier of the
     * component this class is running in.
     * eg, a Filter may be called "filter1",
     * If this class does not have an owning
     * component,  a name from the configuration
     * can be placed here.  This name could also
     * be changed to null for utility classes.
     */
    private String _name = "Heartbeat";
    
    /**
     * A reference to the configuration proxy in use
     */
    private ConfigurationProxy _cp = ConfigurationProxy.getInstance();
    
    /**
     * A HashMap of hosts, with associated HeartbeatHolder's.
     */
    private HashMap _hosts = new HashMap();
    
    /**
     * A reference to the system logger.
     */
    private Logger _logger = ReferenceManager.getInstance().getLogger();

//---STATIC ATTRIBUTES---

//---INNER CLASSES---
    
    /**
     * This inner class simply holding some information
     * about a specific host.
     */
    private class HeartbeatHolder {
        
        /**
         * Construct a new HeartbeatHolder.
         */
        public HeartbeatHolder(Register register) {
            _register = register;
        }
        
        /**
         * Set the time of the last heartbeat
         */
        public void setLastHeartbeat(long lastHeartbeat) {
            _lastHeartbeat = lastHeartbeat;
        }
        
        /**
         * Get the time of the last heartbeat
         */
        public long getLastHeartbeat() {
            return _lastHeartbeat;
        }
        
        /**
         * Get the Register
         */
        public Register getRegister() {
            return _register;
        }
        
        /**
         * last heartbeat time
         */
        private long _lastHeartbeat;
        
        /**
         * register ref
         */
        private Register _register;
    }
    
    /**
     * This worker thread just checks all the hosts and then
     * waits a period of time before doing it again. It sends
     * Alerts as required.
     */
    private class HeartbeatWorker extends Thread {
        
        /**
         * The main run method of this worker thread. It simply
         * checks through all the hosts it has stored, running
         * the analyseHB method on each. It then removes any
         * that have passed a FINAL, and waits a (configured)
         * length of time before doing it again.
         */
        public void run() {
            ConfigurationProxy cp = ConfigurationProxy.getInstance();
            while(true) {
                // this cycle period of this monitor's checks
                int checkPeriod = 0;
                try {
                    checkPeriod = Integer.parseInt(cp.getProperty(_name, "Monitor.Heartbeat.checkPeriod"));
                } catch (PropertyNotFoundException e) {
                    checkPeriod = DEFAULT_CHECK_PERIOD;
                    _logger.write(Heartbeat__Monitor.this.toString(), Logger.WARNING, "Monitor.Heartbeat.checkPeriod value unavailable using default of " + checkPeriod + " seconds");
                } catch (NumberFormatException e) {
                    checkPeriod = DEFAULT_CHECK_PERIOD;
                    _logger.write(Heartbeat__Monitor.this.toString(), Logger.WARNING, "Erronous Monitor.Heartbeat.checkPeriod value in configuration using default of " + checkPeriod + " seconds");
                }
                
                synchronized(Heartbeat__Monitor.this) {
                    // perform the checks (use HB hash, although they *should* be the same)
                    Iterator i = _hosts.keySet().iterator();
                    while(i.hasNext()) {
                        // get host
                        String source = (String) i.next();
                        // check it
                        boolean remove = analyseHB(source);
                        // remove it if it's passed a FINAL
                        if(remove) {
                            i.remove();
                        }
                    }
                }
                
                // wait a while
                try {Thread.sleep(checkPeriod * 1000);} catch (InterruptedException e) {}
            }
        }
        
        /**
         * Analyses a given host's state, and if need be generates
         * a relevant Alert. Note that it also checks if the last
         * alert sent is FINAL, in which case it returns true to
         * indicate removal of this host.
         *
         * @param source the host to check
         * @return whether this host can be deleted
         */
        private boolean analyseHB(String source) {
            ConfigurationProxy cp = ConfigurationProxy.getInstance();
            HeartbeatHolder hbHolder = (HeartbeatHolder) _hosts.get(source);
            Register reg = hbHolder.getRegister();
            
            // get host's HB interval (seconds)
            // this should always exist, thus we set to 0
            int hostHBinterval = 0;
            try {
                hostHBinterval = Integer.parseInt(cp.getProperty("Host."+source, "Host.TCPUpdateTime"));
            } catch (PropertyNotFoundException e) {
                hostHBinterval = 0;
                _logger.write(Heartbeat__Monitor.this.toString(), Logger.WARNING, "TCPUpdateTime value unavailable using default of " + hostHBinterval + " seconds");
            } catch (NumberFormatException e) {
                hostHBinterval = 0;
                _logger.write(Heartbeat__Monitor.this.toString(), Logger.WARNING, "Erronous TCPUpdateTime value in configuration using default of " + hostHBinterval + " seconds");
            }
            
            // get host's last HB time (seconds)
            long lastHeartbeat = hbHolder.getLastHeartbeat();
            // time since last heartbeat (seconds)
            long timeSinceLastHB = (System.currentTimeMillis()/1000) - lastHeartbeat;
            // time since (or until if negative) the expected heartbeat
            long timeSinceExpectedHB = timeSinceLastHB - (long) hostHBinterval;
            
            // best do a check in case the expected heartbeat is in the future
            if(timeSinceExpectedHB < 0) {
                timeSinceExpectedHB = 0;
            }
            
            // find out the threshold level we're at
            int newThreshold = checkAttributeThreshold(timeSinceExpectedHB, reg);
            
            // process the alert
            Heartbeat__Monitor.this.processAlert(newThreshold, "Heartbeat", reg, source, String.valueOf(timeSinceExpectedHB));
            
            if(reg.getLastAlertLevel() == Alert.alertFINAL) {
                return true;
            }
            return false;
        }
    }
}
Revision:	1.21
Committed:	Mon Nov 26 12:56:33 2001 UTC (22 years, 6 months ago) by tdb
Branch:	MAIN
Branch point for:	SERVER_PIRCBOT
Changes since 1.20:	+41 -2 lines
Log Message:	Completing this feature request: [ #479631 ] heartbeat monitor - starting list Adds hosts defined in this configuration value to the heartbeat monitor on startup. Monitor.Heartbeat.initialHosts=raptor.ukc.ac.uk;myrtle.ukc.ac.uk This means the Heartbeat Monitor will generate heartbeat alerts if these hosts don't send in a heartbeat within the expected time. This is useful in situations where the i-scream server comes up after the hosts have gone down, which usually wouldn't have generated an alert - because the server would never have seen the hosts to know they're gone.
#	User	Rev	Content
1	tdb	1.1	//---PACKAGE DECLARATION---
2	tdb	1.20	package uk.org.iscream.cms.server.client.monitors;
3	tdb	1.1
4			//---IMPORTS---
5			import java.util.HashMap;
6			import java.util.Iterator;
7	tdb	1.21	import java.util.StringTokenizer;
8	tdb	1.20	import uk.org.iscream.cms.server.client.*;
9			import uk.org.iscream.cms.server.core.*;
10			import uk.org.iscream.cms.server.util.*;
11			import uk.org.iscream.cms.server.componentmanager.*;
12	tdb	1.1
13			/**
14	tdb	1.18	* This Monitor watches heartbeats.
15			* It generates an alert when a heartbeat that is expected
16			* does not arrive. Unlike all the other monitors, this one
17			* is driven by an event not occuring, rather than an
18			* event occuring. This means it must be actively checking
19			* for missing heartbeat's, and thus has an extra inner class
20			* thread.
21	tdb	1.1	*
22	tdb	1.19	* @author $Author: tdb1 $
23	tdb	1.21	* @version $Id: Heartbeat__Monitor.java,v 1.20 2001/05/29 17:02:34 tdb1 Exp $
24	tdb	1.1	*/
25	ajm	1.14	public class Heartbeat__Monitor extends MonitorSkeleton {
26	tdb	1.1
27			//---FINAL ATTRIBUTES---
28
29			/**
30			* The current CVS revision of this class
31			*/
32	tdb	1.21	public final String REVISION = "$Revision: 1.20 $";
33	tdb	1.1
34	tdb	1.18	/**
35			* A description of this monitor
36			*/
37	tdb	1.1	public final String DESC = "Monitors Heartbeats.";
38
39	tdb	1.18	/**
40			* The default (used if not configured) period at
41			* which to check for old heartbeats. (in seconds)
42			*/
43	tdb	1.3	public final int DEFAULT_CHECK_PERIOD = 60;
44
45	tdb	1.1	//---STATIC METHODS---
46
47			//---CONSTRUCTORS---
48	tdb	1.18
49			/**
50			* Constructs a new Heartbeat monitor, and starts off
51			* the worker thread.
52			*/
53	tdb	1.2	public Heartbeat__Monitor() {
54	ajm	1.16	super();
55	tdb	1.21	createInitialHosts();
56	ajm	1.14	new HeartbeatWorker().start();
57	tdb	1.2	}
58
59	tdb	1.1	//---PUBLIC METHODS---
60
61	tdb	1.18	/**
62			* Analyse a packet of data. In this case, this will just
63			* register the fact that a heartbeat has arrived.
64			*
65			* @param packet The packet of data to analyse
66			*/
67	ajm	1.14	public void analysePacket(XMLPacket packet) {
68			String source = packet.getParam("packet.attributes.machine_name");
69			if (!_hosts.containsKey(source)) {
70	tdb	1.9	synchronized(this) {
71	tdb	1.18	_hosts.put(source, new HeartbeatHolder(new Register(source, _name)));
72	tdb	1.1	}
73			}
74	ajm	1.14	HeartbeatHolder lastHeartbeat = (HeartbeatHolder) _hosts.get(source);
75			lastHeartbeat.setLastHeartbeat(System.currentTimeMillis()/1000);
76	tdb	1.1	}
77
78			/**
79			* Overrides the {@link java.lang.Object#toString() Object.toString()}
80			* method to provide clean logging (every class should have this).
81			*
82	tdb	1.20	* This uses the uk.org.iscream.cms.server.util.NameFormat class
83	tdb	1.1	* to format the toString()
84			*
85			* @return the name of this class and its CVS revision
86			*/
87			public String toString() {
88			return FormatName.getName(
89			_name,
90			getClass().getName(),
91			REVISION);
92			}
93
94			/**
95			* return the String representation of what the monitor does
96			*/
97			public String getDescription(){
98			return DESC;
99			}
100
101			//---PRIVATE METHODS---
102
103	tdb	1.18	/**
104			* Checks whether the time since the last heartbeat
105			* is beyond the threshold(s).
106			*
107			* @param timeSinceLastHB a long time since the last heartbeat arrived
108			* @param reg the Register for this host
109			* @return the level which has been breached, if any
110			*/
111	tdb	1.2	private int checkAttributeThreshold(long timeSinceLastHB, Register reg) {
112	tdb	1.1	for(int thresholdLevel = Alert.thresholdLevels.length - 1; thresholdLevel >= 0; thresholdLevel--) {
113			if (reg.getThreshold(thresholdLevel) != -1.0) {
114	tdb	1.2	if (((long) reg.getThreshold(thresholdLevel)) < timeSinceLastHB) {
115	tdb	1.1	return thresholdLevel;
116			}
117			}
118			}
119	tdb	1.7	return Alert.thresholdNORMAL;
120	tdb	1.21	}
121
122			/**
123			* Gets an initial list of hosts from the config
124			* and adds a fake set of heartbeats for them.
125			* If the hosts don't respond within the timeout
126			* period an alert will be raised.
127			*
128			* The effect of this is to allow us to know about
129			* hosts which weren't on when we started up, and
130			* will thus never have generated a heartbeat - yet
131			* will still want to know they're not responding.
132			*/
133			private void createInitialHosts() {
134			// get the initial list of hosts from the config
135			String initialHosts = "";
136			try {
137			initialHosts = _cp.getProperty(_name, "Monitor.Heartbeat.initialHosts");
138			} catch (PropertyNotFoundException e) {
139			// just leave initialHosts empty
140			_logger.write(Heartbeat__Monitor.this.toString(), Logger.DEBUG, "No initial list of hosts set, defaulting to none.");
141			}
142
143			// parse through the initial hosts adding them
144			StringTokenizer st = new StringTokenizer(initialHosts, ";");
145			while (st.hasMoreTokens()) {
146			String source = st.nextToken();
147			// check if they already exist, don't want to add them twice
148			if (!_hosts.containsKey(source)) {
149			synchronized(this) {
150			_hosts.put(source, new HeartbeatHolder(new Register(source, _name)));
151			}
152			}
153			HeartbeatHolder lastHeartbeat = (HeartbeatHolder) _hosts.get(source);
154			// set a "fake" heartbeat
155			lastHeartbeat.setLastHeartbeat(System.currentTimeMillis()/1000);
156			}
157	tdb	1.1	}
158
159			//---ACCESSOR/MUTATOR METHODS---
160	tdb	1.18
161			/**
162			* Returns a reference to the Queue we're getting data
163			* from. This is specific to this monitor.
164			*
165			* @return a reference to a Queue to get data from
166			*/
167	ajm	1.14	protected Queue getQueue() {
168			return MonitorManager.getInstance().getHeartbeatQueue();
169			}
170
171	tdb	1.1	//---ATTRIBUTES---
172
173			/**
174			* This is the friendly identifier of the
175			* component this class is running in.
176			* eg, a Filter may be called "filter1",
177			* If this class does not have an owning
178			* component, a name from the configuration
179			* can be placed here. This name could also
180			* be changed to null for utility classes.
181			*/
182			private String _name = "Heartbeat";
183
184			/**
185			* A reference to the configuration proxy in use
186			*/
187			private ConfigurationProxy _cp = ConfigurationProxy.getInstance();
188	tdb	1.18
189			/**
190			* A HashMap of hosts, with associated HeartbeatHolder's.
191			*/
192	tdb	1.6	private HashMap _hosts = new HashMap();
193	tdb	1.18
194			/**
195			* A reference to the system logger.
196			*/
197	tdb	1.15	private Logger _logger = ReferenceManager.getInstance().getLogger();
198	tdb	1.1
199			//---STATIC ATTRIBUTES---
200
201			//---INNER CLASSES---
202	tdb	1.18
203			/**
204			* This inner class simply holding some information
205			* about a specific host.
206			*/
207	tdb	1.1	private class HeartbeatHolder {
208
209	tdb	1.18	/**
210			* Construct a new HeartbeatHolder.
211			*/
212			public HeartbeatHolder(Register register) {
213			_register = register;
214	tdb	1.6	}
215
216	tdb	1.18	/**
217			* Set the time of the last heartbeat
218			*/
219	tdb	1.2	public void setLastHeartbeat(long lastHeartbeat) {
220	tdb	1.1	_lastHeartbeat = lastHeartbeat;
221			}
222
223	tdb	1.18	/**
224			* Get the time of the last heartbeat
225			*/
226	tdb	1.2	public long getLastHeartbeat() {
227	tdb	1.1	return _lastHeartbeat;
228			}
229
230	tdb	1.18	/**
231			* Get the Register
232			*/
233			public Register getRegister() {
234			return _register;
235	tdb	1.6	}
236
237	tdb	1.18	/**
238			* last heartbeat time
239			*/
240	tdb	1.2	private long _lastHeartbeat;
241	tdb	1.18
242			/**
243			* register ref
244			*/
245			private Register _register;
246	ajm	1.14	}
247
248	tdb	1.18	/**
249			* This worker thread just checks all the hosts and then
250			* waits a period of time before doing it again. It sends
251			* Alerts as required.
252			*/
253	ajm	1.14	private class HeartbeatWorker extends Thread {
254
255	tdb	1.18	/**
256			* The main run method of this worker thread. It simply
257			* checks through all the hosts it has stored, running
258			* the analyseHB method on each. It then removes any
259			* that have passed a FINAL, and waits a (configured)
260			* length of time before doing it again.
261			*/
262	ajm	1.14	public void run() {
263			ConfigurationProxy cp = ConfigurationProxy.getInstance();
264			while(true) {
265			// this cycle period of this monitor's checks
266			int checkPeriod = 0;
267			try {
268			checkPeriod = Integer.parseInt(cp.getProperty(_name, "Monitor.Heartbeat.checkPeriod"));
269			} catch (PropertyNotFoundException e) {
270			checkPeriod = DEFAULT_CHECK_PERIOD;
271	tdb	1.19	_logger.write(Heartbeat__Monitor.this.toString(), Logger.WARNING, "Monitor.Heartbeat.checkPeriod value unavailable using default of " + checkPeriod + " seconds");
272	ajm	1.14	} catch (NumberFormatException e) {
273			checkPeriod = DEFAULT_CHECK_PERIOD;
274	tdb	1.19	_logger.write(Heartbeat__Monitor.this.toString(), Logger.WARNING, "Erronous Monitor.Heartbeat.checkPeriod value in configuration using default of " + checkPeriod + " seconds");
275	ajm	1.14	}
276
277	tdb	1.19	synchronized(Heartbeat__Monitor.this) {
278	ajm	1.14	// perform the checks (use HB hash, although they should be the same)
279			Iterator i = _hosts.keySet().iterator();
280			while(i.hasNext()) {
281			// get host
282			String source = (String) i.next();
283			// check it
284			boolean remove = analyseHB(source);
285	tdb	1.18	// remove it if it's passed a FINAL
286	ajm	1.14	if(remove) {
287			i.remove();
288			}
289			}
290			}
291
292			// wait a while
293			try {Thread.sleep(checkPeriod * 1000);} catch (InterruptedException e) {}
294			}
295			}
296	ajm	1.16
297	tdb	1.18	/**
298			* Analyses a given host's state, and if need be generates
299			* a relevant Alert. Note that it also checks if the last
300			* alert sent is FINAL, in which case it returns true to
301			* indicate removal of this host.
302			*
303			* @param source the host to check
304			* @return whether this host can be deleted
305			*/
306	ajm	1.16	private boolean analyseHB(String source) {
307			ConfigurationProxy cp = ConfigurationProxy.getInstance();
308			HeartbeatHolder hbHolder = (HeartbeatHolder) _hosts.get(source);
309	tdb	1.18	Register reg = hbHolder.getRegister();
310	ajm	1.16
311			// get host's HB interval (seconds)
312			// this should always exist, thus we set to 0
313			int hostHBinterval = 0;
314			try {
315			hostHBinterval = Integer.parseInt(cp.getProperty("Host."+source, "Host.TCPUpdateTime"));
316			} catch (PropertyNotFoundException e) {
317			hostHBinterval = 0;
318	tdb	1.19	_logger.write(Heartbeat__Monitor.this.toString(), Logger.WARNING, "TCPUpdateTime value unavailable using default of " + hostHBinterval + " seconds");
319	ajm	1.16	} catch (NumberFormatException e) {
320			hostHBinterval = 0;
321	tdb	1.19	_logger.write(Heartbeat__Monitor.this.toString(), Logger.WARNING, "Erronous TCPUpdateTime value in configuration using default of " + hostHBinterval + " seconds");
322	ajm	1.16	}
323
324			// get host's last HB time (seconds)
325			long lastHeartbeat = hbHolder.getLastHeartbeat();
326			// time since last heartbeat (seconds)
327			long timeSinceLastHB = (System.currentTimeMillis()/1000) - lastHeartbeat;
328			// time since (or until if negative) the expected heartbeat
329			long timeSinceExpectedHB = timeSinceLastHB - (long) hostHBinterval;
330
331			// best do a check in case the expected heartbeat is in the future
332			if(timeSinceExpectedHB < 0) {
333			timeSinceExpectedHB = 0;
334			}
335
336			// find out the threshold level we're at
337			int newThreshold = checkAttributeThreshold(timeSinceExpectedHB, reg);
338
339			// process the alert
340	ajm	1.17	Heartbeat__Monitor.this.processAlert(newThreshold, "Heartbeat", reg, source, String.valueOf(timeSinceExpectedHB));
341	ajm	1.16
342			if(reg.getLastAlertLevel() == Alert.alertFINAL) {
343			return true;
344			}
345			return false;
346			}
347	ajm	1.14	}
348	tdb	1.1	}